A friction stir joining technology was used in preparing a performance gradient aluminum alloy sheet through friction stirring. The sheet was treated by solution aging, and the metallographic structure and hardness of the sheet before and after …
verfasst von:
W. W. Song, J. F. Pu, D. Jiang, X. L. Ge, Q. Dong, H. F. Wang
To investigate the relationship between service temperature ranging from –40~250℃, and size effect on tensile properties of thin ASS-304 sheets with nine different thicknesses (40~500 μm), uniaxial tensile tests were performed on thin ASS-304 …
verfasst von:
R. B. Gou, Y. B. Ge, M. Yu, C. Y. Zhang, Y. J. Shi, W. J. Dan, N. Wang, Z. Y. Si
The method of linear conjugation of analytical functions of complex variable was used to solve the problem of circular transversally isotropic plate bending hinged on the edge and loaded over the outer surface by the force distributed along the …
verfasst von:
V. I. Shvabyuk, S. V. Rotko, V. V. Shvabyuk, O. S. Prykhodko
In this paper, a low power fully acoustic non-destructive testing (NDT) of glass fiber reinforced composite plate has been presented. Input acoustic power in microwatt range has been used for local defect resonance (LDR) based delamination …
The present work aims to perform an extensive numerical study based on genetic algorithms and Weibull probabilistic approach to highlight the effect of date palm fiber (DPF), doum palm and alfa fibers on the fiber–matrix interface damage of date …
verfasst von:
M. Belkheir, M. Rouissat, A. Mokaddem, A. Boutaous
To date, most WWER-1000 nuclear power units in Ukraine have reached the end of their design life (30 years). In view of this, work is under way to extend the service life of critical equipment elements beyond the design life (to up to 60 years).
The application and comparison of different fracture mechanics concepts are discussed to be used in computing stress intensity factors (SIF) from the numerical solutions of model crack theory problems with a mixed scheme of the finite element …
During the operation of a steam turbine, its structural elements are subjected to significant thermal and mechanical loads. The consequence of the long-term effect of such a load is the accumulation of scattered fatigue damage to the material of …
In engineering practice, conservative approaches are used to assess the technical condition of pipelines with typical elements (branches, tees and adapters) using reference data on the mechanical properties of the metal in its original state. The …
In the course of combat operations, accidental projectile detonation in the mortar barrel channel can occur through the faulty fuze actuation or detonation of two projectiles for the violation of safety measures, viz double charging of the mortar.
The results of experimental studies on the optimal method of testing materials for hardness depending on physical and mechanical properties are presented. The possibility of evaluating the structural parameters, i.e., the homogeneity coefficients …
The paper analyzes the current state of the grain transportation freight car fleet. The results of the analysis show that grain rail cars have exhausted their initially assigned service life, which is set by the manufacturer, and have the same …
The mechanism of fracture propagation from the circular blast holes with two symmetrical cracks in rock blasting operations was investigated by the displacement discontinuity method. The stress intensity factors at the crack tips of the …
Silk fibroin (SF) is a natural polymer with excellent biocompatibility and mechanical properties and moderate human body degradability, making SF an interesting candidate for regenerative medicine. Composite materials of SF and polyethylene …
verfasst von:
L. Rova, M. Saito, H. Kurita, T. Kanno, A. Gallet-Pandellé, F. Narita
This paper systematically analyzed and discussed the microstructure and mechanical properties of as-cast AZ61 magnesium alloy with rare-earth content of 1.0~4.0 wt.% by optical microscopy, SEM, EDS, and XRD. The results indicate that in addition …
verfasst von:
F. H. Cao, Y. Zhang, Y. Chen, M. G. Jiang, J. L. Zhou, Y. He
During the tunneling process of high-abrasion stratum with strong impact by tunnel boring machines (TBM), disc cutter rings made of H13 and DC53 steels are prone to failures like wear and chipping. To improve the service life of the cutter ring, a …
verfasst von:
M. Z. Han, J. B. Guo, J. Li, Y. J. Huang, H. R. Qi, X. M. Chen
Firstly, this paper used a laser particle size analyzer to test the particle size distribution characteristics of four specific surface areas of phosphate slag powder particles. Then, it used the powder fractal theory to determine the fractal …
Due to critical vibration and excess weight in the frame structure of the automobile, the automobile acceleration effects are the primary problems. This paper describes the material selection based on its weight, vibration reduction, and …
verfasst von:
A. Saravanan, G. Sudharsan, P. Suresh, S. P. Salaisargunan, S. Anandhi, K. Sunil Kumar
The paper considers the use of hydrogen as a component of the technological process to solve an applied problem - the control of material defects, which consisted of controlled fragmentation of steel under dynamic loading to facilitate the …
verfasst von:
V. R. Skalskyi, I. M. Dmytrakh, O. T. Tsyrulnyk, A. M. Syrotyuk, O. I. Zvirko
The paper presents the results of an experimental study of the deformation properties of 10GN2MFA and 15Kh2MFA steels at different ratios of principal stresses under cyclic loading conditions. Applying the proposed phenomenological approach of an …