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weitere Zeitschriftenartikel

01.12.2021 | Original Article | Ausgabe 1/2021 Open Access

Interfacial Morphology and Bonding Mechanism of Explosive Weld Joints

Interfacial structure greatly affects the mechanical properties of laminated plates. However, the critical material properties that impact the interfacial morphology, appearance, and associated bonding mechanism of explosive welded plates are …

Autoren:
Tingting Zhang, Wenxian Wang, Zhifeng Yan, Jie Zhang

01.12.2021 | Original Article | Ausgabe 1/2021 Open Access

Experimental Investigation and Optimization Design of Multi-Support Pipeline System

The design of aircraft hydraulic pipeline system is limited by many factors, such as the integrity of aviation structure or narrow installation space, so the limited clamp support position should be considered. This paper studied the frequency …

Autoren:
Xiantao Zhang, Wei Liu, Yamei Zhang, Yujie Zhao

01.12.2021 | Original Article | Ausgabe 1/2021 Open Access

Research on Key Issues of Consistency Analysis of Vehicle Steering Characteristics

Given the global lack of effective analysis methods for the impact of design parameter tolerance on performance deviation in the vehicle proof-of-concept stage, it is difficult to decompose performance tolerance to design parameter tolerance. This …

Autoren:
Yanhua Liu, Xin Guan, Pingping Lu, Rui Guo

01.12.2021 | Research | Ausgabe 1/2021 Open Access

Experimental Investigation of the Mechanical Behaviour of Wall–Beam–Strut Joints for Prefabricated Underground Construction

Prefabricated construction is becoming increasingly prevalent, however, it is rarely applied in underground constructions, except for tunnel linings, due to the difficulties that arise in jointing various prefabricated components in underground …

Autoren:
Tingjin Liu, Jiandong Lu, Di Wang, Hongyuan Liu

01.12.2021 | Research Article | Ausgabe 1/2021 Open Access

Design and implementation of a maxi-sized mobile robot (Karo) for rescue missions

Rescue robots are expected to carry out reconnaissance and dexterity operations in unknown environments comprising unstructured obstacles. Although a wide variety of designs and implementations have been presented within the field of rescue …

Autoren:
Soheil Habibian, Mehdi Dadvar, Behzad Peykari, Alireza Hosseini, M. Hossein Salehzadeh, Alireza H. M. Hosseini, Farshid Najafi

01.12.2021 | Original Article | Ausgabe 1/2021 Open Access

Optimal Design of Novel Electromagnetic-Ring Active Balancing Actuator with Radial Excitation

Imbalance vibration is a typical failure mode of rotational machines and has significant negative effects on the efficiency, accuracy, and service life of equipment. To automatically reduce the imbalance vibration during the operational process …

Autoren:
Xin Pan, Xiaotian He, Haiqi Wu, Chuanlong Ju, Zhinong Jiang, Jinji Gao

01.12.2021 | Research | Ausgabe 1/2021 Open Access

Investigation on the Mechanical Properties and Microstructure of Eco-friendly Mortar Containing WGP at Elevated Temperature

The properties of mortars containing waste glass powder (WGP) as a cement substitute for sustainable construction at various high temperatures were investigated. For this purpose, specimens from four mixtures with WGP at various percentage levels …

Autoren:
Arash Sedaghatdoost, Kiachehr Behfarnia, Hamidreza Moosaei, Mohammad Bayati, Mohammad Sadegh Vaezi

01.12.2021 | Original Article | Ausgabe 1/2021 Open Access

Support and Positioning Mechanism of a Detection Robot inside a Spherical Tank

Large pressure equipment needs to be tested regularly to ensure safe operation; wall-climbing robots can carry the necessary tools to inspect spherical tanks, such as cameras and non-destructive testing equipment. However, a wall-climbing robot …

Autoren:
Chunlei Tu, Shanshan Jin, Kai Zheng, Xingsong Wang, Sichong Sun

01.12.2021 | Original Article | Ausgabe 1/2021 Open Access

Cylinder Pressure Prediction of An HCCI Engine Using Deep Learning

Engine tests are both costly and time consuming in developing a new internal combustion engine. Therefore, it is of great importance to predict engine characteristics with high accuracy using artificial intelligence. Thus, it is possible to reduce …

Autoren:
Halit Yaşar, Gültekin Çağıl, Orhan Torkul, Merve Şişci

01.12.2021 | Original Article | Ausgabe 1/2021 Open Access

Aerodynamic Characteristics of Isolated Loaded Tires with Different Tread Patterns: Experiment and Simulation

The current research of tire aerodynamics mainly focus on the isolated and simplified tread tire. Compared with the real complex pattern tire, the tread pattern structure and deformed profile of a loaded tire has a greatly influence on tire …

Autoren:
Haichao Zhou, Zhen Jiang, Guolin Wang, Shupei Zhang

01.12.2021 | Original Article | Ausgabe 1/2021 Open Access

Water-Jet Cavitation Shock Bulging as Novel Microforming Technique

With the continuous expansion of the application range of microelectromechanical systems, microdevice forming technology has achieved remarkable results. However, it is challenging to develop new microforming processes that are low cost …

Autoren:
Fuzhu Li, Haiyang Fan, Yuqin Guo, Zhipeng Chen, Xu Wang, Ruitao Li, Hong Liu, Yun Wang

01.12.2021 | Original Article | Ausgabe 1/2021 Open Access

Aerodynamic-Parameter Identification and Attitude Control of Quad-Rotor Model with CIFER and Adaptive LADRC

Current research on quadrotor modeling mainly focuses on theoretical analysis methods and experimental methods, which have problems such as weak adaptability to the environment, high test costs, and long durations. Additionally, the PID …

Autoren:
Sen Yang, Leiping Xi, Jiaxing Hao, Wenjie Wang

01.12.2021 | Original Article | Ausgabe 1/2021 Open Access

Face Grinding Surface Quality of High Volume Fraction SiCp/Al Composite Materials

The existing research on SiCp/Al composite machining mainly focuses on the machining parameters or surface morphology. However, the surface quality of SiCp/Al composites with a high volume fraction has not been extensively studied. In this study …

Autoren:
Xu Zhao, Yadong Gong, Guiqiang Liang, Ming Cai, Bing Han

01.12.2021 | Original Article | Ausgabe 1/2021 Open Access

Model Parameter Transfer for Gear Fault Diagnosis under Varying Working Conditions

Gear fault diagnosis technologies have received rapid development and been effectively implemented in many engineering applications. However, the various working conditions would degrade the diagnostic performance and make gear fault diagnosis …

Autoren:
Chao Chen, Fei Shen, Jiawen Xu, Ruqiang Yan

01.12.2021 | Research | Ausgabe 1/2021 Open Access

Toward Structural Health Monitoring of Civil Structures Based on Self-Sensing Concrete Nanocomposites: A Validation in a Reinforced-Concrete Beam

Self-sensing concrete materials, also known as smart concretes, are emerging as a promising technological development for the construction industry, where novel materials with the capability of providing information about the structural integrity …

Autoren:
Diego L. Castañeda-Saldarriaga, Joham Alvarez-Montoya, Vladimir Martínez-Tejada, Julián Sierra-Pérez

01.12.2021 | Research Article | Ausgabe 1/2021 Open Access

Evaluation of the deformation shape of a balloon-type dielectric elastomer actuator prestretched with water pressure

In this study, we evaluated the deformation shape of a balloon-type dielectric elastomer actuator (DEA) that has been prestretched with water pressure. We fabricated the DEA with poly(dimethylsiloxane) (PDMS) as the elastomeric material and carbon …

Autoren:
Natsumi Koike, Takeshi Hayakawa

01.12.2021 | Original Article | Ausgabe 1/2021 Open Access

Investigation on Reduction of Pressure Fluctuation for a Double-Suction Centrifugal Pump

Double-suction centrifugal pumps have been applied extensively in many areas, and the significance of pressure fluctuations inside these pumps with large power is becoming increasingly important. In this study, a double-suction centrifugal pump …

Autoren:
Qianqian Li, Shiyang Li, Peng Wu, Bin Huang, Dazhuan Wu

01.12.2021 | Research | Ausgabe 1/2021 Open Access

An Accurate Numerical Model Simulating Hysteretic Behavior of Reinforced Concrete Columns Irrespective of Types of Loading Protocols

In older reinforced concrete (RC) buildings, columns are fragile elements that can induce collapse of entire buildings during earthquakes. An accurate assessment of the seismic vulnerability of RC buildings using nonlinear response history …

Autoren:
Chang Seok Lee, Sang Whan Han

01.12.2021 | Research | Ausgabe 1/2021 Open Access

Freeze–Thaw Resistance of Ternary Blended Concrete Using Ferronickel Slag

The present study investigated the resistance of concrete blended with ground granulated blast furnace slag (GGBS) and ferronickel slag (FNS) to cycles of freeze and thaw. The replacement ratio of the binders was 0%, 50 wt% of GGBS and 30 wt% of …

Autoren:
Won Jung Cho, Min Jae Kim

01.03.2021 | Ausgabe 1/2021 Open Access

Augmented Ultrasonic Data for Machine Learning

Flaw detection in non-destructive testing, especially for complex signals like ultrasonic data, has thus far relied heavily on the expertise and judgement of trained human inspectors. While automated systems have been used for a long time, these …

Autoren:
Iikka Virkkunen, Tuomas Koskinen, Oskari Jessen-Juhler, Jari Rinta-aho

01.03.2021 | Ausgabe 1/2021 Open Access

Exploring Flood Filling Networks for Instance Segmentation of XXL-Volumetric and Bulk Material CT Data

XXL-Computed Tomography (XXL-CT) is able to produce large scale volume datasets of scanned objects such as crash tested cars, sea and aircraft containers or cultural heritage objects. The acquired image data consists of volumes of up to and above …

Autoren:
Roland Gruber, Stefan Gerth, Joelle Claußen, Norbert Wörlein, Norman Uhlmann, Thomas Wittenberg

01.03.2021 | Ausgabe 1/2021

Speckle Interferometric Investigation of Argon Pressure-Induced Surface Roughness Modifications in RF-Sputtered MoO3 Film

Film quality analysis is of more considerable significance due to its diversified applications in various fields of technology. The present work reports the speckle interferometric analysis of the argon pressure-induced surface roughness …

Autoren:
S. Soumya, R. Arun Kumar, S. Sreejyothi, Vimal Raj, M. S. Swapna, S. Sankararaman

01.03.2021 | Ausgabe 1/2021

NDE 4.0—A Design Thinking Perspective

Cyber technologies are offering new horizons for quality control in manufacturing and safety assurance in-service of physical assets. The line between non-destructive evaluation (NDE) and Industry 4.0 is getting blurred since both are sensory …

Autoren:
Johannes Vrana, Ripudaman Singh

01.03.2021 | Ausgabe 1/2021

Direct Iterative Basis Image Reconstruction Based on MAP-EM Algorithm for Spectral CT

Spectral CT can separate basis materials, and thus it can provide information on material characterization and quantification. Such information can benefit various clinical applications. However, the presence of non-ideal effects in X-ray imaging …

Autoren:
Zhengdong Zhou, Xuling Zhang, Runchao Xin, Ling Mao, Junshan Jia, Shisong Wei, Tao Sheng, Jinhua Zheng

01.03.2021 | Ausgabe 1/2021

X-ray CT-Based Defect Evaluation of Continuous CFRP Additive Manufacturing

The spread of additive technologies from prototyping to manufacturing has made the development of new products possible, but still needs effective methods in order to allow their characterization. In particular, porosity is considered a crucial …

Autoren:
Stefano Petrò, Cesare Reina, Giovanni Moroni

01.03.2021 | Ausgabe 1/2021 Open Access

Convolutional Neural Networks for Semantic Segmentation as a Tool for Multiclass Face Analysis in Thermal Infrared

Convolutional neural networks were used for multiclass segmentation in thermal infrared face analysis. The principle is based on existing image-to-image translation approaches, where each pixel in an image is assigned to a class label. We show …

Autoren:
David Müller, Andreas Ehlen, Bernd Valeske

01.03.2021 | Ausgabe 1/2021

X-ray Computed Microtomography Characterization of Ti6Al4V/CoCrMo Biomedical Composite Fabricated by Semi-solid Sintering

The semi-solid sintering of a novel Ti6Al4V/CoCrMo biomedical composite was investigated for the first time by semi-in situ X-ray computed microtomography. Composite was fabricated by dry mixing 15 vol% CoCrMo reinforcing particles with Ti6Al4V …

Autoren:
E. Mihalcea, H. J. Vergara-Hernández, L. Olmos, O. Jimenez, D. Arteaga, J. M. Salgado-López

01.03.2021 | Ausgabe 1/2021

Experimentation for Sag and Dimension Measurement of Thin-Walled Tubes and Pipes Using Multi-Channel Ultrasonic Imaging System

Thin-walled tubes and pipes are employed in industries to work under the conditions of high temperature, high pressure, high flow rates and radiation. Due to such stresses and harsh working conditions, tubes lead to sag during operation because of …

Autoren:
N. Pavan Kumar, Eaglekumar G. Tarpara, V. H. Patankar

01.03.2021 | Ausgabe 1/2021 Open Access

Noise Reduction for Improvement of Ultrasonic Monitoring Using Coda Wave Interferometry on a Real Bridge

Reinforced concrete bridges are iconic parts of modern infrastructure. They are designed for a minimum service life of 100 years. However, environmental factors and/or inappropriate use might cause overload and accelerate the deterioration of …

Autoren:
Xin Wang, Joyraj Chakraborty, Ernst Niederleithinger

01.03.2021 | Original Paper | Ausgabe 1/2021 Open Access

A Criterion for the Effective Work of Adhesion in Loading and Unloading of Adhesive Soft Solids from Rough Surfaces

Recently, Dalvi and co-authors have shown detailed experimental data of adhesion of soft spheres with rough substrates with roughness measured down to almost the atomic scale, finding that the Persson and Tosatti theory gave satisfactory …

Autoren:
Antonio Papangelo, Michele Ciavarella

01.03.2021 | Ausgabe 1/2021

The Formation of Microcracks in Water-Saturated Porous Ceramics During Freeze–Thaw Cycles Followed by Acoustic Emission

The acoustic emission (AE) technique was employed to monitor crack formation in the water-saturated ceramic material subjected to freeze–thaw cycles. The samples with water accessible porosity ranging from 6 to 50 vol% were prepared from the …

Autoren:
Tomáš Húlan, Michal Knapek, Štefan Csáki, Jakub Kušnír, Jana Šmilauerová, Patrik Dobroň, František Chmelík, Tiit Kaljuvee, Mai Uibu

01.03.2021 | Ausgabe 1/2021

Highly Sensitive Low-Energy Laser Sensing Based on Sweep Pulse Excitation for Bolt Loosening Diagnosis

The hammering method used by inspectors is generally applied to inspection of looseness of bolted parts. This method entails active sensing through the input of an excitation signal produced by the inspectors, and has the advantage of practical …

Autoren:
Katsuhiro Mikami, Yue Zhao, Masato Morita, Tetsuo Sakamoto, Hiroaki Nishikawa

01.03.2021 | Ausgabe 1/2021

Study of Sphericity and Compactness Parameters in Spheroidal Graphite Iron Using X-Ray Micro-computed Tomography and Image Processing

This work focuses on the relation between the sphericity and compactness parameters obtained from the exhaustive analysis on the graphite nodules of a spheroidal graphite cast iron sample, in order to propose a methodology with allow establishing …

Autoren:
F. V. Díaz, M. E. Peralta, D. O. Fernandino

01.03.2021 | Original Paper | Ausgabe 1/2021 Open Access

Effects of Dispersant and ZDDP Additives on Fretting Wear

This paper examines the effect of dispersant and anti-wear additives on fretting wear in lubricated bearing steel contacts. Reciprocating sliding ball-on-flat fretting tests with a stroke length of 50 μm have been carried out on steel-to-steel …

Autoren:
A. Kontou, R. I. Taylor, H. A. Spikes

01.03.2021 | Original Paper | Ausgabe 1/2021 Open Access

Percolation and Reynolds Flow in Elastic Contacts of Isotropic and Anisotropic, Randomly Rough Surfaces

Predicting the leakage rate of seals requires the distribution of the interfacial separation between a surface and the seal to be known. This distribution function can only be obtained reliably with accurate contact mechanics models for the …

Autoren:
Anle Wang, Martin H. Müser

01.03.2021 | Comment | Ausgabe 1/2021 Open Access

Comments on the Theory of Fluid Flow Between Solids with Anisotropic Roughness

I consider fluid flow at the interface between solids with random roughness. For anisotropic roughness, obtained by stretching isotropic roughness in the x-direction by a factor of $$\gamma ^{1/2}$$ γ 1 / 2 and in the y-direction with a factor of …

Autor:
B. N. J. Persson

01.03.2021 | Original Paper | Ausgabe 1/2021

Effect of Accelerated Aging on the Chemical Signature and Performance of a Multiply-Alkylated Cyclopentane (MAC) Lubricant for Space Applications

The thermo-oxidative degradation of a multiply-alkylated cyclopentane (MAC) lubricant for space applications is investigated. Accelerated aging tests at temperature levels between 60 °C and 150 °C are performed and the aging behavior is …

Autoren:
Archim Wolfberger, Martin Zehl, Andreas Hausberger, Martin Tockner, Sandra Schlögl, Małgorzata Hołyńska, Christopher Semprimoschnig

01.03.2021 | Original Paper | Ausgabe 1/2021 Open Access

Experimental Investigation of Engineering Materials under Repetitive Impact with Slurry Conditions

In some industrial situations, components are subject to repetitive impact in the presence of a slurry. A novel repetitive impact-with-slurry test rig was developed to evaluate the behaviour of a wide range of engineering materials in such …

Autoren:
F. Brownlie, T. Hodgkiess, A. M. Galloway, A. Pearson

01.03.2021 | Original Paper | Ausgabe 1/2021 Open Access

Cylinder-Flat Contact Mechanics with Surface Roughness

We study the nominal (ensemble averaged) contact pressure p(x) acting on a cylinder squeezed in contact with an elastic half space with random surface roughness. The contact pressure is Hertzian-like for $$\alpha < 0.01$$ α < 0.01 and …

Autoren:
A. Tiwari, B. N. J. Persson

01.03.2021 | Ausgabe 1/2021

Nondestructive Evaluation of Drilled Shaft Construction Anomalies Using Full Waveform Tomography of Simulated Crosshole Measurements

Construction of drilled shafts for transportation infrastructure presents quality assurance challenges related to structural anomalies, including voids and degraded concrete. Efforts to evaluate anomalies often use stress-wave non-destructive …

Autoren:
Alireza Kordjazi, Joseph T. Coe, Michael Afanasiev

01.03.2021 | Original Paper | Ausgabe 1/2021 Open Access

Tribological Rehydration and Its Role on Frictional Behavior of PVA/GO Hydrogels for Cartilage Replacement Under Migrating and Stationary Contact Conditions

Graphene oxide (GO) was incorporated into polyvinyl alcohol (PVA) hydrogel to improve its mechanical and tribological performances for potential articular cartilage replacement application. The compressive mechanical properties, creep resistance …

Autoren:
Yan Shi, Dangsheng Xiong, Jianliang Li, Long Li, Qibin Liu, Daniele Dini

01.03.2021 | Original Paper | Ausgabe 1/2021 Open Access

Boundary Friction of ZDDP Tribofilms

The frictional properties of ZDDP tribofilms at low entrainment speeds in boundary lubrication conditions have been studied in both rolling/sliding and pure sliding contacts. It has been found that the boundary friction coefficients of these …

Autoren:
Jie Zhang, Mao Ueda, Sophie Campen, Hugh Spikes

01.03.2021 | Original Paper | Ausgabe 1/2021

Lubrication Performance of Hydrogenated Graphene on Diamond-Like Carbon Films Based on Molecular Dynamics Simulation

Graphene is a good candidate for solid lubricants due to its unique atomic structure. Its lubrication properties are sensitive to chemical modifications such as hydrogenations. Here, an investigation on the lubrication behavior of hydrogenated …

Autoren:
Jiahao Li, Yong Peng, Xianqiong Tang, Qian Xu, Bo Liu, Lichun Bai

01.03.2021 | Original Paper | Ausgabe 1/2021

Interaction Models and Molecular Simulation Systems of Steel–Organic Friction Modifier Interfaces

Ab-initio based benchmarking and improvements of molecular mechanics models for organic friction modifier (OFM) additives used in lubricants are presented. We found the generalized amber force field (GAFF2) appears well suited to model oil-steel …

Autoren:
Arkadii Pominov, Johannes Müller-Hillebrand, Johannes Träg, Dirk Zahn

01.03.2021 | Original Paper | Ausgabe 1/2021

Fluorine-Doped Amorphous Carbon-Coated Magnesium Silicate Hydroxide as Lubricant Additive and Atomic Simulation

According to statistics, transportation accounts for 19% and 23% of global energy consumption and greenhouse gas emissions each year [ 1 – 3 ]. Lubricant additive is an important means to improve equipment reliability, save energy, and reduce …

Autoren:
Hao Zhang, Qiuying Chang

01.03.2021 | Original Paper | Ausgabe 1/2021

Modeling of Formation and Removal of ZDDP Tribofilm on Rough Surfaces

Reducing friction and wear of machine components is an important research objective from both economic and environmental perspectives. Among various kinds of additives [ 1 – 3 ], zinc dialkyldithiophosphate (ZDDP) attracts a lot of attention as an …

Autoren:
Zhe Chen, Chongjie Gu, Tian Tian

01.03.2021 | Ausgabe 1/2021

Vibration-Based Damage Identification in Steel Girder Bridges Using Artificial Neural Network Under Noisy Conditions

The vibration-based damage identification techniques use changes in modal properties of structures to detect damages. However, the results of these methods are not reliable under noise. Therefore, it is essential to clarify which method performs …

Autoren:
Hooman Nick, Armin Aziminejad

01.03.2021 | Ausgabe 1/2021

Defect Localization Using Nonlinear Lamb Wave Mixing Technique

Structural health monitoring using nonlinear guided waves have found to be of great importance. The detection of micro/fatigue cracks in the early stage is essential to avoid catastrophic failures. This paper presents a defect localization …

Autoren:
Mohammed Aslam, Praveen Nagarajan, Mini Remanan

01.03.2021 | Original Paper | Ausgabe 1/2021

Influence of Adhesive Layer Thickness on Wear Damage of the Bonded Interface Between Enamel and Composite Inlays

The objective of this study was to evaluate the influence of adhesive layer thickness on wear damage of the bonded interface between enamel and composite inlays using self-adhesive resin cement. Sixty bonded interface samples consisting of four …

Autoren:
Yuhuan Xiong, Zhou Xu, Ping Yu, Peng Zhao, Shanshan Gao

01.03.2021 | Original Paper | Ausgabe 1/2021

Nanomaterials Derived from a Copper Cinnamate Complex with 4′-Phenyl-2,2′:6′,2″-terpyridine as Antifriction and Anti-Wear Additives for Oil Lubricants

In the present study, a facile and easily accessible method for obtaining copper-containing nanomaterials by thermolysis of copper cinnamate complex with 4′-phenyl-2,2′:6′,2″-terpyridine at 300 °C was developed. The obtained nanomaterials were …

Autoren:
Oxana V. Kharissova, Vladimir A. Irkha, Ekaterina G. Drogan, Victoria E. Burlakova, Vladimir A. Zhinzhilo, Igor E. Uflyand

01.03.2021 | Original Paper | Ausgabe 1/2021 Open Access

Nanoscale Simulations of Wear and Viscoelasticity of a Semi-Crystalline Polymer

We investigate the underlying tribological mechanisms and running-in process of a semi-crystalline polymer using molecular-dynamics simulations. We subject a slab of simulated polyvinyl alcohol to a sliding contact asperity resembling a friction …

Autoren:
Robin Vacher, Astrid S. de Wijn

01.03.2021 | Original Paper | Ausgabe 1/2021

Effect of Tribofilm Induced by Nanoparticle Addition on Wear Behavior of Titanium-Matrix Composite

Sliding wear tests of a titanium-matrix composite (TMC) against M35 steel were performed at room temperature. To improve the wear performance of the TMC, an attempt was made to induce a protective tribofilm by artificially supplying nanoscale …

Autoren:
Huang Xie, Yunxue Jin, Muye Niu, Ning Liu, Jiheng Wang

01.03.2021 | Original Paper | Ausgabe 1/2021

Tribological Performance of Magnesium Silicate Hydroxide/Ni Composite as an Oil-Based Additive for Steel–Steel Contact

Synthetic MSH can solve the shortcomings of natural, self-repairing serpentine materials, but its tribological properties are not ideal. Herein, Ni was selected as an accelerant to prepare MSH/Ni composite powder to obtain better friction …

Autoren:
Yuan Qin, Mingxia Wu, Gang Yang, Yi Yang, Leiming Zhao

01.03.2021 | Original Paper | Ausgabe 1/2021

Modeling of 3D Surface Morphologies for Predicting the Mechanical Contact Behaviors and Associated Electrical Contact Resistance

The accurate estimation of real contact area plays an important role in predicting the mechanical contact situation and associated electrical contact resistance for engineering rough surfaces. In this work, an improved peak identification method …

Autoren:
Chao Zhang, Wanbin Ren

01.02.2021 | Research Article | Ausgabe 1/2021 Open Access

Effect of processing parameters on in situ screen printing-assisted synthesis and electrical properties of Ti3SiC2-based structures

This work reports on the development of pastes containing Ti, TiC, Si, and C elementary powders for in situ synthesis of Ti3SiC2 via screen printing. Four paste compositions were manufactured using two powder mixtures (Ti/Si/C and Ti/TiC/Si/C) …

Autoren:
Mylena Lorenz, Nahum Travitzky, Carlos R. Rambo

01.02.2021 | Research Article | Ausgabe 1/2021 Open Access

Experimental and FEM based investigation of the influence of the deposition temperature on the mechanical properties of SiC coatings

Scanning electron microscopy shows that the microstructure, in particular the overall grain size, of chemical vapor deposited silicon carbide coatings depends on the deposition temperature. So far, the influence of the microstructure on the …

Autoren:
Thomas Schlech, Siegfried Horn, Charles Wijayawardhana, Arash Rashidi

01.02.2021 | Research Article | Ausgabe 1/2021 Open Access

Electrical transport in lead-free Na0.5Bi0.5TiO3 ceramics

Lead-free Na0.5Bi0.5TiO3 (NBT) ceramics were prepared via a conventional oxide-mixed sintering route and their electrical transport properties were investigated. Direct current (DC, σDC) and alternating current (AC, σAC) electrical conductivity …

Autoren:
J. Suchanicz, K. Kluczewska-Chmielarz, D. Sitko, G. Jagło

01.02.2021 | Rapid Communication | Ausgabe 1/2021 Open Access

Formation of hierarchical Si3N4 foams by protein-based gelcasting and chemical vapor infiltration

Silicon nitride foams with a hierarchical porous structure was formed by the combination of protein-based gelcasting, chemical vapor infiltration, and in-situ growth of silicon nitride nanowires. The porosity of the foams can be controlled at …

Autoren:
Junsheng Li, Qiuping Yu, Duan Li, Liang Zeng, Shitao Gao

01.02.2021 | Rapid Communication | Ausgabe 1/2021 Open Access

Size and temperature effects on dielectric breakdown of ferroelectric films

The paper introduces a model of dielectric breakdown strength. The model integrated thermal breakdown and defect models, representing the relationship between the electric field of ferroelectric films and dimensional parameters and operating …

Autor:
Sheng Tong

01.02.2021 | Research Article | Ausgabe 1/2021 Open Access

High performance hydroxyapatite ceramics and a triply periodic minimum surface structure fabricated by digital light processing 3D printing

High performance hydroxyapatite (HA) ceramics with excellent densification and mechanical properties were successfully fabricated by digital light processing (DLP) three-dimensional (3D) printing technology. It was found that the sintering …

Autoren:
Yongxia Yao, Wei Qin, Bohang Xing, Na Sha, Ting Jiao, Zhe Zhao

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

PLLA and cassava thermoplastic starch blends: crystalinity, mechanical properties, and UV degradation

The effect of the addition of cassava thermoplastic starch on the general properties and the photodegradation behavior of poly(L-lactic acid) (PLLA) was evaluated by blending PLLA with TPS in different weight percentages (5, 10, 15, 20 and 25 …

Autoren:
César López, Kiryl Medina, Rosa D´Ambrosio, Rose Mary Michell

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Clickable perfluorocyclobutyl aryl ether polymers bearing azido groups: synthesis and post-functionalization

A novel class of clickable perfluorocyclobutyl (PFCB) aryl ether polymers containing azido groups (APFCB polymers) is reported. The thermal cyclopolymerization reaction of 2-methyl-1,4-bis(1,2,2-trifluorovinyloxy)benzene was first optimized by …

Autoren:
Shining Li, Jianrong Wu, Yuanqin Zhu

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Effect of surface coupling agents on the mechanical behaviour of polypropylene/silica composites: a molecular dynamics study

We investigate the mechanical behavior of polypropylene/silica composites under mode I and II loading by using molecular dynamics simulations, focusing on the effects of two typical surface coupling agents of HMDZ and APTES on the interface …

Autoren:
Qing-Xiang Pei, Viacheslav Sorkin, Ping Liu, Yucheng Zhong, Warintorn Thitsartarn, Chaobin He, Yong-Wei Zhang

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Sonochemical synthesis and swelling behavior of Fe3O4 nanocomposite based on poly(acrylamide-co-acrylic acid) hydrogel for drug delivery application

The addition of magnetic nanoparticles gives unique properties to hydrogels. Magnetic-sensitive gels have various applications in targeted drug delivery, separation, and sensing. One of the most advantageous aspects of using magnetic nanoparticles …

Autoren:
Rajabali Ebrahimi, Ghasem Rezanejade Bardajee

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Synthesis and characterization of liquid crystalline epoxy resins to study the effect of mesogenic length on the physical properties

Two liquid crystalline epoxy (LCE) resins containing different mesogenic lengths were synthesized and cured with two different aromatic diamine curing agents, diaminodiphenylsulfone (DDS) and diaminodiphenylmethane (DDM) to prepare high …

Autoren:
Yi-Sheng Lin, Steve Lien-Chung Hsu, Tsung-Han Ho, Li-Cheng Jheng, Yu-Hsiang Hsiao

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

The effect of dynamic vulcanization systems on the mechanical properties and phase morphology of PLA/NR reactive blends

The effects of dynamic vulcanization systems including sulfur, peroxide, and sulfur/peroxide mixed vulcanization were investigated for dynamically-vulcanized blends of polylactic acid (PLA) and natural rubber (NR) at the PLA/NR ratio of 85/15. For …

Autoren:
Peerapong Chanthot, Nittaya Kaeophimmueang, Patcharee Larpsuriyakul, Cattaleeya Pattamaprom

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Antibacterial gauze based on the synergistic antibacterial mechanism of antimicrobial peptides and silver nanoparticles

Antibacterial gauze is commonly used to prevent wound inflammation and infection. In this study, a novel antibacterial gauze was prepared using antimicrobial peptides and silver nanoparticles, achieving a wide antimicrobial spectrum and increased …

Autoren:
Li Chen, Jianyang Ai, Haihua Cai, Xiang Chen, Zulan Liu, Zhi Li, Fangying Dai

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Effect of mandrel rotation speed on morphology and mechanical properties of polypropylene pipes produced by rotational shear

To research the role of mandrel rotation speed on the morphology and mechanical properties of polypropylene (PP) pipes, a self-made rotational shear system (RSS) was applied in this study to manufacture plastic pipes with improved hoop tensile …

Autoren:
Junjun Wu, Zexiang Xie, Hao Yang, Minghao Yang, Kaizhi Shen, Qiang Fu, Xueqin Gao

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Synthesis and characterization of poly(α-methyl β-alanine)-poly(ε-caprolactone) tri arm star polymer by hydrogen transfer polymerization, ring-opening polymerization and "click" chemistry

Synthesis of poly(α-methyl β-alanine)-poly(ε-caprolactone) [PmBA-(PCL)2] tri arm star polymer was accomplished by "click" chemistry. For this purpose, poly(α-methyl β-alanine) (PmBA) was synthesized from methacrylamide by hydrogen transfer …

Autoren:
Bedrettin Savaş, Efkan Çatıker, Temel Öztürk, Ergül Meyvacı

01.02.2021 | Ausgabe 2/2021

Synthesis, characterization and environmental application of an original adsorbent: polyaniline-coated luffa cylindrica

The coating of the fibrous skeleton of luffa cylindrica (LC) with polyaniline (PANI) was carried out by in-situ polymerization of aniline. A thin PANI layer in its emeraldine-salt form (ES) got bound on to the LC surface, as revealed by the green …

Autoren:
Awatef Dali, Imed Eddine Boulguemh, Fadila Louafi, Chabane Mouats

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Tensile strength and fracture mode I toughness of photocurable carbon fiber/polyether-polythioether composites

This paper reports the development of a novel photocurable carbon fiber/polyether-polythioether (TF CFEC) composite and the comparison of its mechanical performance with that of a conventional thermally cured carbon fiber-epoxi composite (CTC …

Autoren:
Ricardo Acosta Ortiz, José de Jesus Ku Herrera, Aldo Osiel Garcia Santos, Aida Esmeralda García Valdez, Gustavo Soria Arguello

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Synthesis, gas barrier and molecular simulation of intrinsic high-barrier polyimide bearing carbazole and amide

A novel diamine (3,6-CAPDA) bearing carbazole and amide group was prepared. On the basis of 3,6-CAPDA and pyromellitic dianhydride (PMDA), a high-barrier polyimide (3,6-CAPPI) was obtained through a two-step polymerization method. The 3,6-CAPPI …

Autoren:
Yi-Wu Liu, Ao Tang, Jing-Hua Tan, Pan He, Xiang Zhang, Ding Wu, Yu-Hui Li, Xian-Qing Zhao, Hai-Liang Zhang

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

X-ray diffraction and Raman study of pressure-assisted photopolymerization in the ferrocene-doped C60 crystals

The pressure-assisted photopolymerization in the fullerene complex with ferrocene C60·{Fe(C5H5)2}2 was studied for the first time by simultaneous in-situ Raman and X-ray diffraction (XRD) techniques at pressures up to 8 GPa. The irreversible …

Autoren:
K. P. Meletov, A. V. Kuzmin, S. S. Khasanov, D. V. Konarev

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Synthesis and evaluation of hybrid molecularly imprinted polymers for selective extraction of saccharin in aqueous medium

Molecularly imprinted polymers (MIP) are known as high selective sorbent, however, its application in aqueous medium is very limiting. In this way, a new hybrid MIP was successfully synthesized for saccharin (SAC) extraction in aqueous medium. SAC …

Autoren:
Camila Santos Dourado, Fabiana Casarin, Jez Willian Batista Braga, Fabricio Machado, Ana Cristi Basile Dias

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Improvement of mechanical properties for epoxy composites with modified titanate whiskers via dopamine self-oxidation

Epoxy (EP) composites were intended with polydopamine modified titanate whiskers for mechanical improvement. The EP composites exhibited distinct morphology, and also demonstrated enhanced interfacial properties generated by functional groups on …

Autoren:
Tao Wang, Renfeng Song, Wenjing Song, Yunhui Zhao, Kongying Zhu, Xiaoyan Yuan

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Fabrication of highly thermal conductive PA6/hBN composites via in-situ polymerization process

In this research, thermally conductive polyamide 6/hexagonal boron nitride (PA6/hBN) nanocomposites waaere fabricated via an in-situ ring-opening polymerization of ε-caprolactam. The hBN filler was exfoliated through a co-solvent exfoliation …

Autoren:
He-xin Zhang, Do Hyun Seo, Dong-Eun Lee, Keun-Byoung Yoon

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Electrosynthesis of silver metal nanocomposites in a copolymer matrix of 1-vinyl-1,2,4-triazole and acrylic acid

Nanocomposites and silver nanocomposite coatings based on a copolymer of 1-vinyl-1,2,4-triazole and acrylic acid were synthesized in an aqueous and aqueous-ethanol medium on pure iron and steel electrodes by the electrochemical method. The …

Autoren:
S. H. Sargsyan, A. S. Sargsyan, A. V. Meltonyan, A. H. Poghosyan, K. S. Margaryan

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

The effects of the van der Waals potential energy on the Young’s modulus of a polymer: comparison between molecular dynamics simulation and experiment

Molecular dynamics simulation were employed to investigate the effect of changing the potential energies describing primary and secondary bonds on the Young’s modulus of a polymer. The energies were changed by arbitrarily modifying the parameters …

Autoren:
Iwan H Sahputra, Andreas Echtermeyer

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Structural features of functional polysiloxanes radical and ionic photo-curing for laser printing applications

Laser 3D printing is the technology of additive manufacturing of models, prototypes and products from liquid photocuring compositions. The method is based on the irradiation of a liquid photopolymer mixture with a laser radiation to create digital …

Autoren:
Pavel M. Talianov, Sergey S. Rzhevskii, Dmitrii V. Pankin, Konstantin V. Deriabin, Regina M. Islamova, Alina A. Manshina

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Stepwise behavior of surface properties caused by phase inversion in a polymer blend filled with dispersed iron

The surface properties, mechanical characteristics, and morphology of the PP/CPA-Fe composite based on a polymer blend of polypropylene (PP) and copolyamide (CPA) filled with dispersed iron (Fe) were studied. The effect of stepwise behavior of the …

Autoren:
Yevgen Mamunya, Andrii Misiura, Michal Prochazka, Maria Omastova

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Facile fabrication of non-spherical thiol-functionalized organosilica particles and their adsorption of Ag(I)

Thiol-functionalized organosilica particles with bowl-like or golf ball-like morphology were successfully obtained through a facile sol–gel procedure. 3-mercaptopropyltrimethoxysilane (MPTMS) and tetraethoxysilane (TEOS) were copolymerized under …

Autoren:
Yanling Pan, Xin Lu, Puyuan Li, Zhong Xin

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Starch-graft-polyacrylamide copolymer /Fe3O4 /graphene oxide nanocomposite: synthesis, characterization, and application as a low-cost adsorbent for Ni (II) from aqueous solutions

Starch-g-polyacrylamide copolymer and its nanocomposite with Fe3O4 and graphene oxide have been successfully synthesized. The synthesized samples were characterized using FTIR, XRD, SEM, HRTEM, and VSM. The factors that affect the adsorption …

Autoren:
Sh. H. Hegazy, S. K. Mohamed

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Design and in vivo evaluation of alginate-based pH-sensing electrospun wound dressing containing anthocyanins

In this study, a pH-sensing electrospun mat containing purple cabbage (PC) (Brassica oleracea) anthocyanins was developed for wound dressing application. The pH-sensing electrospun mat was prepared from sodium alginate (Alg) and poly (vinyl …

Autoren:
Ayben Pakolpakçıl, Bilgen Osman, Gökhan Göktalay, Elif Tümay Özer, Yasemin Şahan, Behçet Becerir, Esra Karaca

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Exploring the effect of the spacer structure in the heterocyclic ring-fused isoindigo-based conjugated polymer on the charge-transporting property

Isoindigo (IID) has been developed as an electron deficient moiety for high-performance conjugated organic materials, especially for constituting donor–acceptor (D-A) type conjugated polymers. To further enhance the planarity of IID unit to …

Autoren:
Jian-Sian Li, Yen-Wen Huang, Yan-Cheng Lin, Fei-Hao Chen, Wen-Chang Chen, Chu-Chen Chueh

01.02.2021 | Ausgabe 1/2021

Peaked sloshing in a wedge container

Finite-amplitude free-surface flow in a wedge container is investigated analytically. We study a motionless standing wave of pure potential-flow acceleration with maximal amplitude where its right-angle surface peak falls from rest. The nonlinear …

Autoren:
Peder A. Tyvand, Jonas Kristiansen Nøland

01.02.2021 | Ausgabe 1/2021

Active-subspace analysis of exceedance probability for shallow-water waves

We model shallow-water waves using a one-dimensional Korteweg–de Vries equation with the wave generation parameterized by random wave amplitudes for a predefined sea state. These wave amplitudes define the high-dimensional stochastic input vector …

Autoren:
Kenan Šehić, Henrik Bredmose, John D. Sørensen, Mirza Karamehmedović

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Co2O3 and MnO2 as inexpensive catalysts for the ring-opening polymerization of cyclic esters

The cheaper and easy to handle catalysts are particularly important for catalytic studies. Herein, inexpensive Co2O3 and MnO2 were used as catalysts for the ring-opening polymerization (ROP) of rac-lactide (rac-LA) and ε-caprolactone (ε-CL). The …

Autoren:
Mrinmay Mandal, Debashis Chakraborty

01.02.2021 | Ausgabe 1/2021

Interaction of magnetoelastic shear waves with a Griffith crack in an infinite strip

In this research paper, the diffraction of a Griffith crack, situated in an infinite strip of finite thickness, due to magnetoelastic shear wave propagation has been analyzed. The effect of magnetic field on the Griffith crack interaction has been …

Autoren:
Sourav Kumar Panja, S. C. Mandal

01.02.2021 | Ausgabe 1/2021

Propagation of surface waves past asymmetric elastic plates

Water wave scattering by two asymmetric thin elastic plates with arbitrary inclinations is investigated using integral equations. The plates are submerged in finite depth water. The assumption of Euler–Bernoulli beam model for the plates, the use …

Autoren:
Souvik Kundu, R. Gayen, Sourav Gupta

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Lignin addition to polyacrylonitrile copolymer solution and its effect on the properties of carbon fiber precursor

Polyacrylonitrile copolymer (PAN) fiber and PAN/lignin (PL) fiber were wet spun from the PAN copolymer solution and PAN/Lignin blend solution using dimethyl sulphoxide (DMSO) solvent. A blend of 90% by weight (wt %) PAN terpolymer and 10wt% lignin …

Autoren:
P. Porkodi, Abhilash J.K., Sheeja Sunil, Tarun Kumar Pardhi, Hemant Kumar Shukla, Sanjay K. Shete, Ashok Kumar

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Treatment of hemp fibres for use in rotational moulding

The benefit of using alkali-treated hemp fibre as the reinforcement for rotationally moulded polyethylene composites was evaluated in this research. Untreated and alkali-treated hemp fibre were characterised using different techniques such as …

Autoren:
Maria A. S. Oliveira, Kim L. Pickering, Tom Sunny, Richard J. T. Lin

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Fabrication of polystyrene-acrylic/ZnO nanocomposite films for effective removal of methylene blue dye from water

Polymer nanocomposite films were formed from the aqueous dispersion of thermally linking styrene-acrylic copolymer (Tubifast 4010®, CHT), partially esterified melamine resin (Tubifix®, CHT), and ZnO nanoparticles as filler. The developed …

Autoren:
Mariia Pasichnyk, Miroslava Václavíková, Inna Melnyk

01.02.2021 | ORIGINAL PAPER | Ausgabe 2/2021

Nano-cavitation structure toughness mechanism and optical properties of amphiphilic acrylate block copolymer modified epoxy system

A series of amphiphilic acrylate block copolymer (ABC) modified epoxy were prepared by the solution casting method. The mechanical strength, thermal stability, and light transmittance of the modified epoxies were characterized, and the fracture …

Autoren:
Ankang Yang, Lusi Zou, Shangwen Zha, Panpan Zhou, Panluo Wu, Rong Guan

22.01.2021 | Industrial Application Paper

Hierarchical optimization of a novel vehicle door system under side impact based on integrated weighting method

Door system plays a very important role in the domain of automobile passive safety. In order to improve its side crashworthiness, some affiliated impact components are assembled. Conventional impact parts can make the door system possess enough …

Autoren:
Weiwei Wang, Shijuan Dai, Guangchao Lu, Jiahao Shu, Chunyan Wang, Wanzhong Zhao, Mingdun Cao, Qikang Meng

22.01.2021 | Original Contribution

Fabrication of durable corrosion-resistant polyurethane/SiO2 nanoparticle composite coating on aluminium

In this work, SiO2 nanoparticle–embedded polyurethane superhydrophobic coating on aluminium substrate was fabricated using spin coating technique. By embedding SiO2 nanoparticles into the polyurethane matrix, superhydrophobicity is successfully …

Autoren:
Aditya Kumar, Mukesh Kumar Meena

21.01.2021 | Original Article

Hybrid model for the analysis of the modal properties of a ball screw vibration system

In accordance with the vibration characteristics of ball screw feed systems, a hybrid modeling method is proposed to study its dynamic behavior. Partially, the ball screw is modeled as a continuous body, and the remaining components are considered …

Autoren:
Qin Wu, Fengshou Gu, Andrew Ball, Hua Huang

21.01.2021 | Views & Comments

Intelligent deformation of biomedical polyurethane

Autoren:
Maolan Zhang, Huan Wang, Junjie Mao, Da Sun, Xiaoling Liao

21.01.2021 | Research Article

Synthesis of pH-responsive triazine skeleton nano-polymer composite containing AIE group for drug delivery

We exploited a unique porous structure of the nano-covalent triazine polymer (NCTP) containing aggregation-induced emission (AIE) group to achieve controlled release and drug tracking in tumor acidic microenvironment. NCTP was synthesized by the …

Autoren:
Yifan Zhang, Xueying Peng, Xinbo Jing, Lin Cui, Shengchao Yang, Jianning Wu, Guihua Meng, Zhiyong Liu, Xuhong Guo

21.01.2021

Modeling Secondary Students’ Genetics Learning in a Game-Based Environment: Integrating the Expectancy-Value Theory of Achievement Motivation and Flow Theory

This study examined students’ genetics learning in a game-based environment by exploring the connections between the expectancy-value theory of achievement motivation and flow theory. A total of 394 secondary school students were recruited and …

Autoren:
Arif Rachmatullah, Frieda Reichsman, Trudi Lord, Chad Dorsey, Bradford Mott, James Lester, Eric Wiebe

21.01.2021 | Research Article

Wavelength-selectivity polarization dependence of optical absorption and photoresponse in SnS nanosheets

The optical and optoelectronic characteristics of SnS nanosheets with strong anisotropic crystal structure are researched. Transmission electron microscopy and polarized Raman spectra are used to determine the crystal orientation of SnS …

Autoren:
Yu Cui, Ziqi Zhou, Xinghua Wang, Xiaoting Wang, Zhihui Ren, Longfei Pan, Juehan Yang

21.01.2021 | Research Article

A GQD-based composite film as photon down-converter in CNT/Si solar cells

Graphene quantum dots (GQDs), have unique quantum confinement effects, tunable bandgap and luminescence property, with a wide range of potential applications such as optoelectronic and biomedical areas. However, GQDs usually have a strong tendency …

Autoren:
Xuewei Zhao, Yizeng Wu, Zhiyuan Xia, Shulong Chang, Yuanyuan Shang, Anyuan Cao

21.01.2021 | Research Paper

Topology optimization of bi-material structures with frequency-domain objectives using time-domain simulation and sensitivity analysis

In this paper, we propose to use time-domain transient analysis to compute the response of structures in a wide frequency band by means of Fourier transform. A time-domain adjoint variable method is then developed to carry out the sensitivity …

Autoren:
Pingzhang Zhou, Yingchao Peng, Jianbin Du

21.01.2021 | Technical Article

A Harmony Search-Based Wrapper-Filter Feature Selection Approach for Microstructural Image Classification

Besides chemical composition, microstructure plays a key role to control the properties of engineering materials. A strong correlation exists between microstructure and many mechanical and physical properties of a metal. It has the utmost …

Autoren:
Shib Sankar Sarkar, Khalid Hassan Sheikh, Arpan Mahanty, Kalyani Mali, Aniruddha Ghosh, Ram Sarkar

21.01.2021

Numerical Investigation on Shear Deflection of Steel Welded I Sections with Varying Span to Depth Ratios

Deflection of the steel I-sections is an important phenomenon that needs to be taken into account to ensure that the serviceability limit state criteria of the Australian Standards are met. The method that is widely used to calculate the …

Autoren:
Salman Kamali, Harry Far

21.01.2021 | Original Paper

A new method to measure the three-dimensional solubility parameters of acrylate rubber and predict its oil resistance

As people pay more and more attention to environmental protection and the high cost of diesel and gasoline, in order to reduce environmental pollution and use cost, some low-pollution and low-cost components, such as alcohols (ethanol, etc.) and …

Autoren:
Rui Su, Guangyong Liu, Hongguang Sun, Zhanfu Yong

21.01.2021 | Research Article-Electrical Engineering

Hybrid Fuzzy Fractional-Order PID-Based Speed Control for Brushless DC Motor

This article presents a novel hybrid control scheme for speed control of Brushless DC (BLDC) motor by simultaneously controlling BLDC motor reference current and inverter DC bus voltage. A fractional-order PID (FOPID) controller is employed to …

Autoren:
M. A Mohammed Eltoum, A. Hussein, M. A. Abido

21.01.2021 Open Access

Study of a Premixed Turbulent Counter-Flow Flame with a Large Eddy Simulation Method

The turbulent counter-flow flame (TCF) has proven to be a useful benchmark to study turbulence-chemistry interactions, however, the widely observed bulk flow fluctuations and their influence on the flame stability remain unclear. In the present …

Autoren:
Y. Gong, W. P. Jones, A. J. Marquis

21.01.2021 | Research Paper

Coupling electro-mechanical behaviors in the interdigital electrode device of ferroelectrics

The electro-mechanical coupling behaviors of ferroelectric devices with interdigital electrodes may become complicated due to the material inhomogeneity and local field concentration under the complex working conditions. In this paper, a …

Autoren:
Suxin Pan, Shilin Xie, Qun Li

21.01.2021 | Research Paper

A numerical implementation of the length-scale independent phase field method

This paper is aiming at modifying the global energy storage functional proposed by Wu [ 1 ] for the phase field method so that Newton’s method can be used for energy minimization. The phase field method is an energy-based approach to represent …

Autoren:
Wenlong Zhang, Ala Tabiei, Donald French

21.01.2021

Breakthrough dynamics of nitrogen, oxygen, and argon on silver exchanged titanosilicates (Ag-ETS-10)

Breakthrough curves of N2, O2, and Ar on Silver exchanged titanosilicates (Ag-ETS-10) extrudates and granules were measured using a laboratory scale dynamic column breakthrough (DCB) apparatus. In order to investigate the dynamics of the mass …

Autoren:
Sayed Alireza Hosseinzadeh Hejazi, Libardo Estupiñan Perez, Rafael Teruo Maruyama, Arvind Rajendran, Steven M. Kuznicki

21.01.2021 | Original

A displacement potential function using complex variables for numerical computations of three-dimensional elasticity problems

This paper shows the development of a displacement potential function based on the Galerkin potential using complex variables. The displacement potential function results in a more suitable method for numerical calculations since it avoids the …

Autoren:
Jesús Mares Carreño, José Ángel Lodegario Ortega Herrera, Griselda Stephany Abarca Jiménez

21.01.2021

Estimating boundary dynamics using robotic sensor networks with pointwise measurements

In this paper, we consider environmental boundaries that can be represented by a time-varying closed curve. We use n robots equipped with location sensors to sample the dynamic boundary. The main difficulty during the prediction process is that …

Autoren:
David Saldaña, Renato Assunção, M. Ani Hsieh, Mario F. M. Campos, Vijay Kumar

21.01.2021 | Original Contribution

Synergistic effect of 2D/0D mixed graphitic carbon nitride/Fe2O3 on the excellent corrosion behavior of epoxy-based waterborne coatings

Polydopamine (PDA) functionalized graphitic carbon nitride nanosheets (PDCN) and α-Fe2O3 nanoparticles (PDFe) were synthesized and characterized by FT-IR, XRD, TGA, XPS, and TEM. The complementary fillers of two-dimensional PDCN and …

Autoren:
Caihong Sheng, Lihong Cheng, Xu Chen, Yuhui Zhang, Weihong Guo

21.01.2021 | Original Research Article

Structural and Optical Investigations of Ce3+/Mn2+-Doped LaPO4 Phosphors

Lanthanum orthophosphate (LaPO4) and La0.95−xCe0.05MnxPO4 (x = 0.00, 0.03, 0.10) phosphors were synthesized by a simple and cost-efficient co-precipitation method and the formation of LaPO4 nanorods with a monoclinic P21/n crystal structure was …

Autoren:
O. AitMellal, L. Oufni, M. Y. Messous, F. Neatu, M. Florea, S. Neatu, A. M. Rostas, M. Secu

21.01.2021 | Original Research Article

Investigation of Optical and Diode Parameters of 9-[(5-Nitropyridin-2-Aminoethyl) Iminiomethyl]-Anthracene Thin Film

The optical, structural and electrical behavior of thin films has been a highly important topic in scientific works and technological applications for many years. Because of this importance, the characteristic behaviors of the film forms are …

Autoren:
Ümmühan Akın, Serkan Sayın, Nihat Tuğluoğlu, Ö. Faruk Yüksel

21.01.2021 | Original Research Article

Green Synthesized α-MnO2 As a Photocatalytic Reagent for Methylene Blue and Congo Red Degradation

Pure α-MnO2 materials with interconnected nanowires in an urchin shape were synthesized by a green synthesis method. Purified extracts of cinnamon and moringa were used as benign and economical reducing agents to synthesize C-MnO2 and M-MnO2 …

Autoren:
H. M. Abuzeid, A. M. Youssef, S. M. Yakout, A. M. Elnahrawy, A. M. Hashem

21.01.2021 | Original Research Article

Effect of Magnesium Doping to Reduce the Charge Reservoir Layer in Cu0.5Tl0.5(Ba2−xMgx)Ca2Cu3Oy (x = 0, 0.15, 0.25, 0.35) Superconductors

The charge reservoir layer plays a crucial role in the charge transfer mechanism in high-temperature superconductors. The effect of reducing the thickness of the Cu0.5Tl0.5Ba2O4−δ charge reservoir by replacing Ba with Mg atom in Cu0.5Tl0.5-1223 …

Autoren:
Kashif Naseem, Nawazish A. Khan, Syed Hamza Safeer

21.01.2021 | Original Research Article

Atomic Layer Deposition of ZnO for Modulation of Electrical Properties in n-GaN Schottky Contacts

ZnO films (5 nm and 20 nm) have been grown on GaN single-crystal substrates by thermal atomic layer deposition (ALD) and the electrical properties of n-GaN Schottky contacts modified by such ultrathin ZnO films have been characterized. Compared …

Autoren:
Hogyoung Kim, Myeong Jun Jung, Seok Choi, Byung Joon Choi

21.01.2021 | Original Research Article

Synthesis and Broadband Absorption of Fe-Based Nanoparticles in the Ku-Band

In this work, we propose a simple method to characterize the broadband absorption of different sizes of iron (Fe) nanoparticles. The absorption feature in the Ku-band (14–18 GHz) of paint/Fe nanocomposites with different Fe concentration is …

Autoren:
Le Thi Hong Phong, Bui Xuan Khuyen, Ta Ngoc Bach, Bui Son Tung, Do Khanh Tung, Ngo Thi Hong Le, Vu Dinh Lam, Nguyen Thanh Tung, Do Hung Manh

21.01.2021 | Original Article

Controlled synthesis of ultrasmall RuP2 particles on N,P-codoped carbon as superior pH-wide electrocatalyst for hydrogen evolution

Electrocatalytic hydrogen evolution reaction (HER) is a highly potential strategy to massively produce green hydrogen fuels. However, the employment of costly Pt-based electrocatalyst in the cathode of electrolyzer greatly hampers the development …

Autoren:
Ying-Hua Wang, Rui-Qing Li, Hai-Bo Li, Hong-Li Huang, Zeng-Jing Guo, Hong-Yan Chen, Yao Zheng, Kong-Gang Qu

21.01.2021 | Originalarbeiten/Originals Open Access

Friction behavior of innovative carbon friction linings for wet multi-plate clutches

The torque transfer capability as well as long-term endurance are essential for wet multi-plate clutches. The quality of the torque transmission process largely depends on the tribological system consisting of friction pairing, lubricant and …

Autoren:
U. Stockinger, D. Groetsch, F. Reiner, K. Voelkel, H. Pflaum, K. Stahl

21.01.2021 | Original Research Article

Deep Insights into the Twinning Mechanism in High-Performance Al Alloys: A Comprehensive First-Principles Study

The twinning mechanism of Al solid solutions is comprehensively investigated via the first-principles method. The relative stability of C and H atoms at tetrahedral and octahedral centers is discussed. Moreover, the interaction energies between …

Autoren:
Touwen Fan, Feng Liu, Zhipeng Wang, Linghong Liu, Dongchu Chen, Qihong Fang, Pingying Tang

21.01.2021

Modeling the Initiation and Propagation of Cracks in a Fibrous Composite Under Loading Across Fibers

A computational model describing crack formation in a fibrous composite is developed. It is assumed that, upon repeated loading, crack formation in the composite leads to its fracture. Determination of the unknown parameters characterizing an …

Autor:
V. M. Mirsalimov

21.01.2021

A generalized integro-differential theory of nonlocal elasticity of n-Helmholtz type: part I—analytical formulation and thermodynamic framework

A generalized theory of nonlocal elasticity is elaborated. The proposed integral type nonlocal formulation is based on attenuation functions being assumed as the convolution product of n first order (Eringen type) kernels. The theory stems from a …

Autoren:
Dario De Domenico, Giuseppe Ricciardi, Harm Askes

21.01.2021 | Composites & nanocomposites

Interfacial bonding properties of the eco-friendly geopolymer-wood composites: influences of embedded wood depth, wood surface roughness, and moisture conditions

With growing concerns about the finite resources and the environmental impact of the building industry, synthetic reinforcements are being substituted by the lignocellulose fibers due to their sustainable, low cost, non-toxic, lightweight, and …

Autoren:
Hanzhou Ye, Bright Asante, Goran Schmidt, Andreas Krause, Yang Zhang, Zhiming Yu

21.01.2021 | Computation & theory

Intriguing electronic, optical and mechanical properties of the vertical and lateral heterostructures on the boron phosphide and GaN monolayers

Using the first-principles method, the structural, electronic, optical and mechanical properties of the vertical and lateral heterostructures based on the boron phosphide (BP) and GaN monolayers, named V-GaN@BP and L-GaN@BP, are investigated …

Autoren:
Yusheng Wang, Xiaowei Wu, Nahong Song, Xiaohui Yang, Yafeng Zheng, Fei Wang

21.01.2021 | Metals & corrosion Open Access

Thermoelastic properties and γ’-solvus temperatures of single-crystal Ni-base superalloys

Ni-based single-crystal superalloys (SXs) are used to manufacture turbine blades, which operate at temperatures above 1000 °C. They have to withstand a load spectrum, which includes creep, thermal fatigue and hot corrosion. Creep strength, the …

Autoren:
O. M. Horst, D. Schmitz, J. Schreuer, P. Git, H. Wang, C. Körner, G. Eggeler

21.01.2021 | Metals & corrosion

Interfacial structures between aluminum nitride and Cu–P–Sn–Ni brazing alloy with Ti film

Control of Ag electro chemical migration is crucial for long–term reliability of electrical components in high–voltage applications. In this work, Cu was bonded onto an AlN substrate at temperatures between 650 °C and 950 °C for 1 h using a Ag …

Autoren:
Nobuyuki Terasaki, Naochika Kon, Hajime Chiba, Touyou Ohashi, Yoshiyuki Nagatomo, Yoshirou Kuromitsu, Kevin M. Knowles

21.01.2021 | Metals & corrosion

Deformation twinning-induced single-variant ω-plates in metastable β-Ti alloys containing athermal ω-precipitates

The ω-phase in metastable β-titanium (Ti) alloys attracts great research interests owing to the metastability and the involved microstructural complexity upon straining, while the fundamental understanding on its formation mechanism is still …

Autoren:
Wei Chen, Keer Li, Guoxiang Yu, Junqiang Ren, You Zha, Jun Sun

21.01.2021 | Computation & theory

Particle curvature effects on microstructural evolution during solid-state sintering: phenomenological insights from phase-field simulations

Local curvatures have a profound influence on sintered microstructure. Here, using phase-field simulations, particle curvature effects were phenomenologically investigated by using geometrical configurations of two, three, and four particles, and …

Autoren:
Deep Choudhuri, Logan Blake

21.01.2021 | Composites & nanocomposites

Zeolitic imidazolate framework nanoparticles loaded with gadolinium chelate as efficient T1 MRI contrast agent

Gd–chelate magnetic resonance imaging (MRI) contrast agents used in conventional clinical medicine still have some shortcomings, such as their low relaxation rates and poor imaging sensitivity. In this work, a Gd–chelate (Gd–DTPA), with a …

Autoren:
Weixiu Zhou, Jiyun Shen, Jiaomin Lin, Miao An, Lu An, Qiwei Tian, Shiping Yang

21.01.2021 | Energy materials

Nanostructured tubular carbon materials doped with cobalt as electrocatalyst for efficient oxygen reduction reaction

The development of non-precious metal catalysts with high efficiency and superior reaction durability for oxygen reduction reaction (ORR) is of great importance for construction of next-generation fuel cells. Herein, we report the preparation of …

Autoren:
Zhaoqi Zhu, Jingxin Han, Jie Cui, Peilei Zhou, Zifeng Yang, Hanxue Sun, An Li

21.01.2021 | Metals & corrosion

Analysis of the twin variant selection in polycrystalline cobalt

The samples of polycrystalline cobalt were strained in tension in the second stage of work hardening in order to activate twinning. The identification of twins and their orientation was analyzed using electron backscatter diffraction. The study of …

Autoren:
Mayerling Martinez Celis, Peter Minárik, Eric Hug, Julie Dorenlor, František Chmelík, Michal Knapek, Patrik Dobroň

21.01.2021

Constrained Mixture Models of Soft Tissue Growth and Remodeling – Twenty Years After

Soft biological tissues compromise diverse cell types and extracellular matrix constituents, each of which can possess individual natural configurations, material properties, and rates of turnover. For this reason, mixture-based models of growth …

Autor:
J. D. Humphrey

21.01.2021 | ORIGINAL ARTICLE

Water-jet guided laser drilling of thermal barrier coated aerospace alloy

Drilling using quasi-continuous wave (QCW) millisecond pulse fibre laser is the state-of-the-art for producing film-cooling holes over uncoated aero-engine components. Laser drilling of coated components, including thermal barrier coated (TBC) …

Autoren:
Sundar Marimuthu, Bethan Smith

21.01.2021 | ORIGINAL ARTICLE

Ultrasonic nanocrystalline surface modification of low strength aluminum alloy: trade-off between surface integrity and production rate aiming at desired fatigue life

In processing of metallic material by ultrasonic nanocrystalline surface modification (UNSM), obtaining high quality sample with desired surface property needs a careful control on processing factors. The condition would be more critical when the …

Autoren:
Reza Bagherian Azhiri, Aydin Jadidi, Abolfazl Salmani Bideskan, Mostafa Rahimi Dizji

21.01.2021 | ORIGINAL ARTICLE

Modelling and interaction analysis of the self-pierce riveting process using regression analysis and FEA

Self-pierce riveting (SPR) is a major joining method used in the automotive industry. However, there still lacks a fast and easy-to-use joint quality prediction tool available for the automotive engineers. In this study, the simple but effective …

Autoren:
Huan Zhao, Li Han, Yunpeng Liu, Xianping Liu

21.01.2021 | ORIGINAL ARTICLE

Study on EDM technology of distributed group electrodes in titanium alloy with large inclined angle and thin-walled group holes

Titanium alloy parts with a large inclined angle and thin-walled group holes exhibit low machining efficiency, poor position accuracy, and difficulties in the manufacturing of small gap grouped graphite electrodes. To achieve the high-efficiency …

Autoren:
Ze Yu, Dunwen Zuo, Yuli Sun, Jianshe Zhao, Xuemei Chen, Kaibo Shi, Wei Chen

21.01.2021 | ORIGINAL ARTICLE

The variable radial depth of cut in finishing machining of thin-walled blade based on the stable-state deformation field

Due to the low stiffness of the thin-walled part, the larger deformation error occurs in the milling process, and the machining precision and quality cannot be satisfied. Previous studies of the tool path generation methods for the deformation …

Autoren:
Yaohua Hou, Dinghua Zhang, Ying Zhang, Baohai Wu

20.01.2021

Finite Element Modeling of Steel-concrete Composite Beams with Different Shear Connection Degrees

In order to study the behavior of Steel-concrete composite beams with different shear connection degrees, using finite element software ABAQUS, four models with different numbers of headed studs are established, all of which apply appropriate …

Autoren:
Xing Zheng, Wenxian Li, Qiao Huang, Bing Wang

20.01.2021

Experimental and Numerical Investigation of Stress Concentration at Rib-to-Crossbeam Joint

In orthotropic steel decks (OSDs), the rib-to-crossbeam joint is the most vulnerable detail that has not been drawn enough attention. The failure mode of cracks initiate from the lower weld end on rib wall is governing its fatigue performance.

Autoren:
Heng Fang, Nouman Iqbal, Gilles Van Staen, Hans De Backer

20.01.2021 | Research paper

Machine Learning Neural-Network Predictions for Grain-Boundary Strain Accumulation in a Polycrystalline Metal

It is widely accepted that microstructural features such as grain boundaries (GBs) play a significant role in the macroscopic plastic response of polycrystalline metals [ 1 , 2 ]. Some grain boundaries act as barriers, blocking slip and resulting …

Autoren:
R. B. Vieira, J. Lambros

20.01.2021 | Research paper

Fluorescent 2D Digital Image Correlation With Built‐in Coaxial Illumination for Deformation Measurement in Space‐constrained Scenarios

Two-dimensional digital image correlation (2D-DIC) is a simple and easy-to-implement image-based optical technique for full-field surface displacement and strain measurement of planar objects [ 1 – 3 ]. As surface strains of a sheet sample in …

Autoren:
B. Dong, C. Li, B. Pan

20.01.2021 | Research paper

Critical Evaluation of Spherical Indentation Stress-Strain Protocols for the Estimation of the Yield Strengths of Steels

Reliable relationships between the low-cost indentation measurements (e.g., hardness, instrumented indentation) and the much more expensive but standardized protocols for the measurements of tensile yield strengths of metals and alloys are of …

Autoren:
S. Mohan, N. Millan-Espitia, M. Yao, N. V. Steenberge, S. R. Kalidindi

20.01.2021 | Chemical routes to materials

Cu, Ni and multi-walled carbon-nanotube-modified graphite felt electrode for nitrate electroreduction in water

The safety of drinking water had been given significant attention because of its direct influence on human health. Nitrate pollution in groundwater has been reported by many countries and organizations as a topic of significant interest. Nitrate …

Autoren:
Chang Lu, Xiaoyun Lu, Kun Yang, Haiou Song, Shupeng Zhang, Aimin Li

20.01.2021 | Energy materials

Synthesis of oxygen vacancies implanted ultrathin WO3-x nanorods/reduced graphene oxide anode with outstanding Li-ion storage

Defect engineering is playing an extraordinary role in tuning a wide range of physical and chemical properties of transition-metal oxides, especially the controllable formation and accurate discrimination of oxygen vacancies (V O s), which is …

Autoren:
Miao Zhang, Hanli Sun, Yangyang Guo, Dong Wang, Dongfeng Sun, Qingmei Su, Shukai Ding, Gaohui Du, Bingshe Xu

20.01.2021 | Energy materials

A facile method for preparing porous g–C3N4 nanosheets with efficient photocatalytic activity under visible light

g–C3N4 nanosheets with porous structures (labelled PGN) were prepared by an extremely facile one-step, template-free method. The method used to prepare porous g–C3N4 nanosheets in this research was thermal polycondensation of urea pre-treated with …

Autoren:
Caixia Sun, Jingjie Dai, Hongxia Zhang, Shouying Li, Amin Wang

20.01.2021 | Electronic materials

Improving the Mn2+ emission and stability of CsPb(Cl/Br)3 nanocrystals by Ni2+ doping in ambient air

Mn-doped perovskite CsPb(Cl/Br)3 nanocrystals (NCs) have been widely explored due to their unique dual-color emission characteristics, which could reduce the usage of toxic Pb and introduce the exciton emission in blue region and the stable Mn2+ …

Autoren:
Rui Zhang, Yaoxin Yuan, Jianfeng Zhang, Haiyun Liu, Gang Chen, Kun Li, MengQing Hong, Wenbin Zuo, Chunlan Wang, Wen Yang, Zhenxing Qin

20.01.2021 | Energy materials

Co3O4 porous nanorod/N-doped reduced graphene oxide composite with fast pseudocapacitive lithium storage for high-performance lithium-ion capacitors

The kinetics mismatch between battery type anode and capacitor type cathode for most lithium-ion capacitors (LICs) greatly hampers their overall electrochemical performance. Herein, we construct a high-performance LIC using activated carbon as …

Autoren:
Jing Shi, Xiao Li, Tao Yang, Xiaodong Tian, Yequn Liu, Shiwen Lei, Yan Song, Zhanjun Liu

20.01.2021 | Composites & nanocomposites

Ultralight graphene/carbon nanofibers/carbon nanotubes aerogels with thermal insulating and hot-oil adsorption performance

In this work, we design a novel ultra-light graphene/carbon nanofibers/carbon nanotube aerogels (GCNAs) with excellent thermal insulating and hot oil adsorption ability. The GCNAs is prepared by a facile freeze-drying method followed by …

Autoren:
Shan Zhang, Lidong Tian, Xiaohu Chen, Yanen Wang, Qiuyu Zhang

20.01.2021 | Technical Paper

Effect of 3 nm gate length scaling in junctionless double surrounding gate SiNT MOSFET by using triple material gate engineering

In this work, drain current ID for 3 nm gate length of triple material (TM) double surrounding gate (DSG) inversion mode (IM) and junctionless (JL) Si nanotube (SiNT) MOSFET has been studied and simulation results are reported using Silvaco ATLAS …

Autoren:
Sanjay, B. Prasad, Anil Vohra

20.01.2021 | Original

A fundamental solution for the harmonic vibration of asymmetrically laminated composite plates described by a higher-order theory of shear strains

We derive here a fundamental solution for the harmonic vibration of thick asymmetrically laminated composite plates. The kinematics of the plate is based on Reddy’s third-order shear deformation theory (J Appl Mech 51:745–752, 1984). The …

Autor:
C. H. Daros

20.01.2021 | Original Open Access

Modal analysis and insights into damping phenomena of a special vibration chain

Vibration chains are of interest in many fields of practical applications. In this contribution, a modal analysis of the rather special Mikota’s vibration chain is performed. Herein, focus is set on the mode shapes of this multibody oscillator …

Autoren:
Peter C. Müller, Wolfgang E. Weber

20.01.2021 | Original Paper

Stabilized methods for high-speed compressible flows: toward hypersonic simulations

A stabilized finite element framework for high-speed compressible flows is presented. The Streamline-Upwind/Petrov–Galerkin formulation augmented with discontinuity-capturing (DC) are the main constituents of the framework that enable accurate …

Autoren:
David Codoni, Georgios Moutsanidis, Ming-Chen Hsu, Yuri Bazilevs, Craig Johansen, Artem Korobenko

20.01.2021 | Original Research Article

Synthesis, Characterization and Luminescent Properties of Mixed-Ligand Nickel Complexes for Opto-Electronic Application

This paper reports the synthesis of a mixed ligand nickel complexes as an emissive layer in organic light emitting diode applications. Synthesized ligand and nickel complexes were characterized by Fourier transform infrared spectroscopy, 1H …

Autoren:
P. H. Amith Nayak, H. S. Bhojya Naik, H. B. Teja, B. R. Kirthan, R. Viswanath

20.01.2021 | Original Research Article

Lightweight MXene/Cellulose Nanofiber Composite Film for Electromagnetic Interference Shielding

Lightweight and high-strength materials with high electromagnetic interference shielding performance are the best solution for electromagnetic pollution. However, the MXene film with extremely high electromagnetic interference shielding …

Autoren:
Zhibo Cui, Chunlei Gao, Zhimin Fan, Jingfeng Wang, Zhongjun Cheng, Zhimin Xie, Yuyan Liu, Youshan Wang

20.01.2021 | Original Research Article

In Situ Observation of Electromigration-Induced Anomalous Precipitation of Ag3Sn Phase in Ag-Containing Solder Joints

The anomalous precipitation behavior of Ag3Sn phase in Sn-3.5Ag lead-free solder joints during liquid–solid electromigration at 1.0 × 104 A/cm2 has been observed using a real-time imaging method with synchrotron radiation. Large Ag3Sn phases …

Autoren:
Z. J. Zhang, M. L. Huang

20.01.2021 | ORIGINAL ARTICLE

Study on kerf characteristics and surface integrity based on physical energy model during abrasive waterjet cutting of thick CFRP laminates

Abrasive waterjet machining was an effective method for cutting CFRP materials in various industries, while machining defects are inevitably observed especially for thick CFRP laminates due to the inherent characteristics of waterjet. In this …

Autoren:
Maojun Li, Xiangchen Lin, Xujing Yang, Hao Wu, Xianming Meng

20.01.2021 | ORIGINAL ARTICLE Open Access

Mechanical clinching and self-pierce riveting for sheet combination of 780-MPa high-strength steel and aluminium alloy A5052 sheets and durability on salt spray test of joints

To increase the usage of high-strength steel and aluminium alloy sheets for lightweight automobile body panels, the joinability of sheet combinations including a 780-MPa high-strength steel and an aluminium alloy A5052 sheets by mechanical …

Autoren:
Yohei Abe, Ken-ichiro Mori

20.01.2021 | ORIGINAL ARTICLE

Real-time thermal modelling approach of a machine tool spindle based on bond graph method

The thermal characteristics of spindles have a significant influence on the workpiece quality. This paper proposes a novel real-time thermal characteristic modelling approach for spindles based on the bond graph method, with simplified thermal …

Autoren:
Yun Yang, Zhengchun Du, Xiaobing Feng, Jianguo Yang

20.01.2021 | ORIGINAL ARTICLE

Roll crown control capacity of sextic CVC work roll curves in plate rolling process

The shape curve of continuous variable crown (CVC) roll applied in plate rolling process is usually adopted as cubic curves or quintic curves, but the coupling between quadratic crown and quartic crown of conventional CVC roll shape curve could …

Autoren:
Jingguo Ding, Yanghaochen He, Mengxue Song, Zhijie Jiao, Wen Peng

20.01.2021 | ORIGINAL ARTICLE

Wear mechanism and experimental study of a tool used for micro-milling single-crystal nickel-based superalloys

To study the wear mechanism of micro-tools that cut superalloy materials, a single-crystal nickel-based superalloy DD98 was micro-milled by a cemented carbide milling tool with a 0.6-mm diameter, and the wear standard for the micro-milling tool …

Autoren:
Qi Gao, Guang-yan Guo, Ming Cai

20.01.2021 | Original Paper

Improving the engineering design process by simulating iteration impact with ASM2.0

Engineering design processes that are dependent on Computer-Aided Engineering (CAE) tools commonly involve complex patterns of tasks, including concurrency and intertwined iterations. There are often inefficiencies and improvement opportunities in …

Autoren:
David C. Wynn, P. John Clarkson

20.01.2021 | Original Paper

Synthesis, characterization, and swelling behaviors of sodium carboxymethyl cellulose-g-poly(acrylic acid)/semi-coke superabsorbent

A novel multi-functional superabsorbent polymer (SAP) of carboxymethyl cellulose sodium grafted polyacrylic acid/semi-coke (CMC-g-PAA/SC) was firstly prepared by grafting acrylic acid (AA) onto the carboxymethyl cellulose sodium (CMC) using …

Autoren:
Yan Liu, Yongfeng Zhu, Bin Mu, Yongsheng Wang, Zhengjun Quan, Aiqin Wang

20.01.2021 | Original Paper

Excellent electromagnetic wave absorption by complex systems through hybrid polymerized material

Management of magnetic properties of polymer without changing its chemical formation is the main challenge in polymer engineering and science. In the current study, the innovative three-dimensional hybrid polymerized material was prepared through …

Autoren:
Hossein Chamkouri, Majid Ahmadlouydarab, Hafez Talebi, Hafiz Muhammad Ali

20.01.2021 | ORIGINAL ARTICLE

The use of TOPSIS-based-desirability function approach to optimize the balances among mechanical performances, energy consumption, and production efficiency of the arc welding process

A couple of models were established to investigate the effects of welding parameters (voltage, wire feed speed, and welding speed) on the resultant mechanical properties of welding bead and welding heat input on the basis of a Box-Behnken …

Autoren:
Dawei Zhao, Yuriy Bezgans, Nikita Vdonin, Wenhao Du

20.01.2021 | Original Article Open Access

Directional correlation coefficient measures for Pythagorean fuzzy sets: their applications to medical diagnosis and cluster analysis

Compared to the intuitionistic fuzzy sets, the Pythagorean fuzzy sets (PFSs) can provide the decision makers with more freedom to express their evaluation information. There exist some research results on the correlation coefficient between PFSs …

Autoren:
Mingwei Lin, Chao Huang, Riqing Chen, Hamido Fujita, Xing Wang

20.01.2021 | Original Article Open Access

Multi-objective fully intuitionistic fuzzy fixed-charge solid transportation problem

During past few decades, fuzzy decision is an important attention in the areas of science, engineering, economic system, business, etc. To solve day-to-day problem, researchers use fuzzy data in transportation problem for presenting the …

Autoren:
Shyamali Ghosh, Sankar Kumar Roy, Ali Ebrahimnejad, José Luis Verdegay

20.01.2021 | Original Article Open Access

Neutrosophic fuzzy goal programming approach in selective maintenance allocation of system reliability

Selective maintenance problem plays an essential role in reliability optimization decision-making problems. Systems are a configuration of several components, and there are situations the system needs small intervals or break for maintenance …

Autoren:
Murshid Kamal, Umar Muhammad Modibbo, Ali AlArjani, Irfan Ali

20.01.2021 | Original Article

Improved sensing performance of WO3 nanoparticles decorated with Ag and Pt nanoparticles

The increasing issues on inflammable, explosive and toxic gases with the developments of industries have been focused in recent years. Owing to low cost, fast response and facile operation, gas sensors built with metal oxide semiconductors have …

Autoren:
Dong-Liang Feng, Zheng-You Zhu, Ling-Ling Du, Xia-Xia Xing, Chen Wang, Jian Chen, Yong-Tao Tian, Da-Chi Yang

20.01.2021 | Original Article

Synthesis of hollow spherical nickel oxide and its gas-sensing properties

There are increasing demands for environmental monitoring, air quality control, medical diagnostics, explosions and toxic gas detection, as well as for high-performance gas sensors [ 1 – 6 ]. It is well known that high sensitivity, rapid response …

Autoren:
Wang-Chang Geng, Xin-Rou Cao, Shi-Lu Xu, Jiang-Hua Yang, Natasha Babar, Zi-Jun He, Qiu-Yu Zhang

20.01.2021 | Full Research Article

Shape recovery analysis of the additive manufactured 3D smart surfaces through reverse engineering

Novel methodology to estimate the shape memory behavior of smart structure fabricated by additive manufacturing is presented by merging 3D laser scanning and reverse engineering (RE). The specimens made from a temperature-stimulated smart …

Autoren:
Nilesh Tiwari, Suraj Waman Gagare, A. A. Shaikh

20.01.2021 | Research Article-Chemical Engineering

Adsorption of Uranium (VI) onto Natural Algerian Phosphate: Study of Influencing Factors, and Mechanism

The goal of this study was to use natural phosphate (NP) abundant in Algeria, as an adsorbent for the removal of uranium (VI) from aqueous solutions in batch adsorption. A full 23 factorial extended experimental design was investigated. The …

Autoren:
Safir Ouassel, Salah Chegrouche, Djamel Nibou, Abderahmane Aknoun, Redouane Melikchi, Sihem Khemaissia, Sabino De Gisi

20.01.2021 | Research Article-Petroleum Engineering

Pore Pressure Prediction and Its Relationship with Rock Strength Parameters and Weight on Bit in Carbonate Reservoirs (A Case Study, South Pars Gas Field)

Accurate pore pressure knowledge is particularly critical in drilling, such as drilling safety (avoidance of blowouts and well control lost-time incidents). Pore pressure prediction in carbonate reservoir due to the fact that the pore system and …

Autoren:
Reza Khoshnevis-zadeh, Alireza Hajian, Ehsan Larki

20.01.2021 | Research Article-Biological Sciences

Exome Sequencing Analysis of Familial Cases of Multiple Sclerosis and a Monozygotic Discordant Twin

Multiple sclerosis (MS) is a chronic inflammatory autoimmune disease, which leads to neurodegenerative processes that cause neuron demyelination. MS is multifactorial with uncertain etiology, where interactions between genetic makeup of an …

Autoren:
Asem M. Alkhateeb, Diala S. Salman, Kifah A. Al-Hayk

20.01.2021 | Research Article-Mechanical Engineering

Experimental Investigations of the Turbulent Boundary Layer for Biomimetic Surface with Spine-Covered Protrusion Inspired by Pufferfish Skin

Pufferfish skin is known for its spine-covered surface, which differs significantly from that of common fish species. Recent research has shown that such rough surfaces may have potential applicability in saving energy. In order to verify the drag …

Autoren:
Honggen Zhou, Yesheng Zhu, Guizhong Tian, Xiaoming Feng, Yaosheng Zhang

20.01.2021 | Research Article-Civil Engineering

Preparedness for Mass Gatherings: A Simulation-Based Framework for Flow Control and Management Using Crowd Monitoring Data

Proactive management at mass gatherings is vital to ensure safe crowd evacuation during emergencies. The increasing number of crowd incidents and casualties during the Hajj season is one of the major concerns for authorities in Saudi Arabia. This …

Autoren:
Hassan M. Al-Ahmadi, Imran Reza, Arshad Jamal, Wael S. Alhalabi, Khaled J. Assi

20.01.2021

Effect of Route BC Equal-Channel Angular Pressing on the Microstructure, Microtexture, and Homogeneity of Al-18%Si-4.5%Cu Alloy

Al-18%Si-4.5%Cu alloy was processed by route BC equal-channel angular pressing (ECAP) at a temperature of 400 °C. Electron backscattered diffraction (EBSD) was used to analyze the microstructure and microtexture during the ECAP process. The …

Autoren:
Esmaeil Damavandi, Salman Nourouzi, Sayed Mahmood Rabiee, Roohollah Jamaati, Jerzy A. Szpunar

20.01.2021

On Nanographene-Reinforced Polyvinylidene Fluoride Composite Matrix for 4D Applications

In past two decades, number of studies has been reported on 3D printing of polyvinylidene fluoride (PVDF) composite matrix. But hitherto, little has been reported on 4D applications of graphene(Gr)-reinforced PVDF for maintenance and repair of …

Autoren:
V. Kumar, R. Singh, I. P. S. Ahuja, J. P. Davim

20.01.2021

Electroanalytical Performance of Surfactant-Modified Composite Carbon Paste Electrode for the Sensitive and Selective Determination of Fast Sulphon Black F

A sensitive and selective voltammetric sensor was fabricated by incorporating carbon paste into multiwalled carbon nanotubes, followed by drop coating of sodium dodecyl sulfate (SDS), onto the surface in an attempt to find an approachable method …

Autoren:
Amrutha Balliamada Monnappa, Jamballi Gangadharappa Gowda Manjunatha, Aarti Sripathi Bhatt

20.01.2021

Study on Fracture Mechanism and Microstructural Evolution in 780 MPa Grade FB Steel with a High Hole Expanding Ratio

FB780 steel with a high hole-expanding ratio, as ferrite–bainite dual-phase steel, is an indispensable material to manufacture different automobile parts. In the present study, uniaxial tension tests and metallographic analyses were conducted to …

Autoren:
Wen Liang, Qing Yuan, Qingxiao Zhang, Wenwei Qiao

20.01.2021

Investigations into Enhanced Formability of AA5083 Aluminum Alloy Sheet in Single-Point Incremental Forming

In this article, formability of aluminum alloy AA5083-sheet in single point incremental forming (SPIF) is investigated through forming limit curves (FLCs) and maximum formable wall angle considering different forming parameters and conditions.

Autoren:
Gautam Kumar, Kuntal Maji

20.01.2021

Processing of Low-Carbon Deep-Drawing Steel with High Plastic Anisotropy Using Two-Stage Batch Annealing Cycle

Anisotropy in texture determines capacity of the steel to achieve maximum plastic flow in the plane of the sheet and maximum resistance to flow in a direction perpendicular to the sheet. Present work has been carried out to explore the potential …

Autoren:
Anjana Deva, Pratiksha Pandey, Md. Serfraj Alam, Biraj Kumar Sahoo, B. Ravi Kumar, Sandip Ghosh Chowdhury, B. K. Jha

20.01.2021

Game tree search for minimizing detectability and maximizing visibility

We introduce and study the problem of planning a trajectory for an agent to carry out a scouting mission while avoiding being detected by an adversarial opponent. This introduces a multi-objective version of classical visibility-based target …

Autoren:
Zhongshun Zhang, Jonathon M. Smereka, Joseph Lee, Lifeng Zhou, Yoonchang Sung, Pratap Tokekar

20.01.2021 Open Access

Vacuum-Assisted Hot-Forming Using Tailored Laminate Temperature

A non-isothermal vacuum assisted hot-forming process using tailored laminate temperature is introduced. By using process simulation and manufacturing experiments, improved laminate quality is achieved compared to the standard hot-forming process.

Autoren:
Tommy Grankäll, Per Hallander, Malin Åkermo

20.01.2021 | Research Paper

A dominance-based rough set approach applied to evaluate the credit risk of sovereign bonds

Even though sovereign bonds represent low-risk alternatives that give investors a healthy income, the risk assessment process for these bonds is still considered subjective because of the lack of criteria-related information and transparency of …

Autoren:
Julio Cezar Soares Silva, Diogo Ferreira de Lima Silva, Luciano Ferreira, Adiel Teixeira de Almeida-Filho

20.01.2021 Open Access

Insights into the Microstructural Origin of Brain Viscoelasticity

Prospects for Microstructure-Informed Constitutive Modeling

Mechanical aspects play an important role in brain development, function, and disease. Therefore, continuum-mechanics-based computational models are a valuable tool to advance our understanding of mechanics-related physiological and pathological …

Autoren:
Nina Reiter, Biswaroop Roy, Friedrich Paulsen, Silvia Budday

20.01.2021

A Chemomechanical Model for Regulation of Contractility in the Embryonic Brain Tube

Morphogenesis is regulated by genetic, biochemical, and biomechanical factors, but the feedback controlling the interactions between these factors remains poorly understood. A previous study has found that compressing the brain tube of the early …

Autoren:
Alina Oltean, Larry A. Taber

20.01.2021

Need the Uniform Stress Field Inside Multiple Interacting Inclusions Be Hydrostatic?

Since the pioneering work of Eshelby on a single ellipsoidal inclusion embedded in an infinite space, much attention has been devoted in the literature to the question of the uniformity of the stress field inside inclusions surrounded by an …

Autoren:
Ming Dai, Peter Schiavone

20.01.2021

A Morphoelastic Shell Model of the Eye

The eye grows during childhood to position the retina at the correct distance behind the lens to enable focused vision, a process called emmetropization. Animal studies have demonstrated that this growth process is dependent upon visual stimuli …

Autoren:
L. S. Kimpton, B. J. Walker, C. L. Hall, B. Bintu, D. Crosby, H. M. Byrne, A. Goriely

20.01.2021

Swelling-Induced Interface Crease Instabilities at Hydrogel Bilayers

Two dissimilar hydrogel layers bonded together become unstable when the compressive stresses due to diffusion-driven swelling of the layers reach a critical point and creases form at the interface. Although creasing instabilities observed on …

Autoren:
Berkin Dortdivanlioglu, Nil Ezgi Dincer Yilmaz, K. B. Goh, Xiaolin Zheng, Christian Linder

20.01.2021 | Research Article

Schiff-base silver nanocomplexes formation on natural biopolymer coated mesoporous silica contributed to the improved curative effect on infectious microbes

Infectious microbes that spread easily in healthcare facilities remain as the severe threat for the public health, especially among immunocompromised populations. Given the intricate problem of dramatic increase in resistance to common biocides …

Autoren:
Ling Cai, Yanqiang Huang, Yuanyuan Duan, Qiao Liu, Qilan Xu, Jia Jia, Jianming Wang, Qian Tong, Peipei Luo, Yujie Wen, Luming Peng, Qian Wu, Xudong Hang, Huijun Jiang, Ping Zhu, Yanmei Yang, Boshen Zhou, Liping Zeng, Hongkai Bi, Jin Chen

20.01.2021 | Research Article

Working-in-tandem mechanism of multi-dopants in enhancing electrocatalytic nitrogen reduction reaction performance of carbon-based materials

Developing carbon-based electrocatalysts with excellent N2 adsorption and activation capability holds the key to achieve highly efficient nitrogen reduction reaction (NRR) for reaching its practical application. Here, we report a highly active …

Autoren:
Wenqing Zhang, Keke Mao, Jingxiang Low, Hengjie Liu, Yanan Bo, Jun Ma, Qiaoxi Liu, Yawen Jiang, Jiuzhong Yang, Yang Pan, Zeming Qi, Ran Long, Li Song, Yujie Xiong

20.01.2021 | Research Article

A novel aluminum-carbon nanotubes nanocomposite with doubled strength and preserved electrical conductivity

Enhancing the mechanical strength of highly conductive pure metals usually causes significant reduction in their electrical conductivity. For example, introducing phase/matrix interfaces or more grain boundaries, are common and effective methods …

Autoren:
Shuai Zhang, Gaoqiang Chen, Timing Qu, Jinquan Wei, Yufan Yan, Qu Liu, Mengran Zhou, Gong Zhang, Zhaoxia Zhou, Huan Gao, Dawei Yao, Yuanwang Zhang, Qingyu Shi, Hua Zhang

20.01.2021 | Original Research

Fiber deformation behavior of discontinuous CFRTP in gear forging

The purpose of the study is to elucidate fiber deformation behavior during the forging of a spur gear by using a carbon fiber reinforced thermoplastic billet. The billet was composed of PA6/UD chips with a fiber length of 30 mm and fiber volume …

Autoren:
Daichi Tatsuno, Takeshi Yoneyama, Misaki Kuga, Yoshitomo Honda, Yukihiro Akaishi, Hayato Hashimoto

20.01.2021 | Original Paper: Sol–gel and hybrid materials for optical, photonic and optoelectronic applications

Tailoring of optical, hydrophobic, and anti-icing properties of Ca–Mg co-doped ZnO thin films via sol–gel method

Ice formation on solid surfaces may originate serious problems in various fields such as aircraft, electrical lines etc. Hydrophobic coatings and surfaces can have potential applications with anti-icing properties via excessive repellency of …

Autoren:
Faran Baig, Ali Asif, Muhammad Waseem Ashraf, Hafiz Muhammad Fahad

20.01.2021 | Original Paper: Nano-structured materials (particles, fibers, colloids, composites, etc.)

Mn-doped Fe2O3/diatomite granular composite as an efficient Fenton catalyst for rapid degradation of an organic dye in solution

This investigation reports the synthesis and evaluation of a novel and improved diatomite modified with Fe–Mn binary oxide (DT-FeMn) Fenton catalysis for photochemical reactions in aqueous media. The catalyst was prepared by a co-precipitation …

Autoren:
Dian Dai, Huan Liang, Dongsheng He, Herman Potgieter, Ming Li

19.01.2021 | Original Contribution Open Access

Phase behavior of solvent-rich compositions of the polymer/drug system poly(butylene succinate) and N,N-diethyl-3-methylbenzamide (DEET)

Poly(butylene succinate) (PBS) is used to produce micro-/nanoporous biodegradable scaffolds, suitable for the release of the mosquito repellent N,N-diethyl-3-methylbenzamide (DEET), based on thermally induced phase separation. For solvent-rich …

Autoren:
Hande Ece Yener, Georg Hillrichs, René Androsch

19.01.2021

Global Large Solutions to the Cauchy Problem of Planar Magnetohydrodynamics Equations with Temperature-Dependent Coefficients

In this paper, we consider planar magnetohydrodynamics (MHD) system when the viscous coefficients and heat conductivity depend on specific volume v and temperature ??. For technical reasons, the viscous coefficients and heat conductivity are …

Autor:
Zhaoyang Shang

19.01.2021 | Original Article

One-step in situ encapsulation of Ge nanoparticles into porous carbon network with enhanced electron/ion conductivity for lithium storage

To meet the growing of high energy density for future applications in portable electronic devices and hybrid electric vehicles, achieving increase the specific capacity for the anodes in lithium-ion batteries (LIBs) has become more and more …

Autoren:
Xue Qiao, Xue-Biao Yang, Na Zhang, Xian-Ling Wang, Ying-Ying Song, Yong-Qing Zhai, Dan Li, Hong-Qiang Wang
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