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2023 | Buch

Fundamentals of Shape Memory Alloys (SMAs) Kapitel lesen Erstes Kapitel lesen

Thermo-Mechanically Coupled Cyclic Deformation and Fatigue Failure of NiTi Shape Memory Alloys

Experiments, Simulations and Theories

verfasst von: Guozheng Kang, Chao Yu, Qianhua Kan

Verlag: Springer Nature Singapore

Buchreihe : Springer Series in Materials Science

Enthalten in: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik"

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Über dieses Buch

Written by leading experts in the field, this book highlights an authoritative and comprehensive introduction to thermo-mechanically coupled cyclic deformation and fatigue failure of shape memory alloys. The book deals with: (1) experimental observations on the cyclic deformation and fatigue failure in the macroscopic and microscopic scales; (2) molecular dynamics and phase-field simulations for the thermo-mechanical behaviors and underlying mechanisms during cyclic deformation; (3) macroscopic phenomenological and crystal plasticity-based cyclic constitutive models; and (4) fatigue failure models.

This book is an important reference for students, practicing engineers and researchers who study shape memory alloys in the areas of mechanical, civil and aerospace engineering as well as materials science.

Inhaltsverzeichnis

Frontmatter
Chapter 1. Fundamentals of Shape Memory Alloys (SMAs)
Abstract
As an introduction, this chapter introduces the super-elasticity and shape memory effect of SMAs first, and then outlines the significant thermo-mechanical coupling effect under different loading rates and the functional fatigue and structural fatigue under cyclic loads of SMAs, finally briefly addresses the classification of SMAs and the content arrangement of successive chapters.
Guozheng Kang, Chao Yu, Qianhua Kan
Chapter 2. Experimental Observations on Thermo-Mechanically Coupled Cyclic Deformation and Fatigue Failure of NiTi SMAs
Abstract
In this chapter, the thermo-mechanically coupled cyclic deformation features of super-elastic and shape memory NiTi SMAs are experimentally investigated under the stress-controlled uniaxial and multiaxial cyclic loading conditions. The definitions and evolution features of the transformation ratchetting, reorientation ratchetting, and temperature-induced transformation ratchetting of NiTi SMAs are revealed experimentally. Moreover, the thermo-mechanically coupled fatigue failures of super-elastic and shape memory NiTi SMAs under uniaxial and multiaxial cyclic loadings are discussed in details.
Guozheng Kang, Chao Yu, Qianhua Kan
Chapter 3. Molecular Dynamics Simulations on Thermo-Mechanically Coupled Cyclic Deformation of NiTi SMAs
Abstract
In this chapter, the molecular dynamics (MD) simulations on the thermo-mechanically coupled cyclic deformation of NiTi SMA single crystal and polycrystalline aggregates are performed, the microscopic mechanisms of the cyclic degradations of super-elasticity and one-way shape memory effect are clarified, which are very useful in constructing related constitutive models.
Guozheng Kang, Chao Yu, Qianhua Kan
Chapter 4. Phase-Field Simulations on Thermo-Mechanically Coupled Cyclic Deformation of NiTi SMAs
Abstract
In this chapter, some phase-field models are proposed to investigate the thermo-mechanically coupled cyclic deformation of NiTi SMA single crystal and polycrystalline aggregates by addressing the related microscopic mechanisms. Firstly, the crystal plasticity coupled phase-field model are proposed to simulate the super-elasticity and its cyclic degradation in single crystal and polycrystalline NiTi SMAs, the thermo-mechanical coupling effect and the grain-size dependence of super-elasticity and its cyclic degradation are investigated. Then, the proposed phase-field model is extended by further considering the martensite reorientation, dislocation slipping and deformation twinning mechanisms in the martensite phase, as well as the viscoplastic deformation of grain boundary, so, the cyclic degradation of the one-way shape memory effect of single crystal and polycrystalline NiTi SMAs are well reproduced.
Guozheng Kang, Chao Yu, Qianhua Kan
Chapter 5. Phenomenological Constitutive Models of NiTi SMAs
Abstract
In this chapter, the phenomenological constitutive models of NiTi SMAs are proposed. Firstly, a generalized plasticity-based phenomenological model is proposed to describe the uniaxial transformation ratchetting of NiTi SMAs at room temperature. Then, by considering the interaction between the martensite transformation and dislocation slipping, a dislocation-based phenomenological constitutive model is constructed to describe the temperature-dependent transformation ratchetting of NiTi SMAs observed at different ambient temperature. Finally, in the framework of irreversible thermodynamics and further considering the internal heat production, a thermo-mechanically coupled phenomenological constitutive model is developed to describe the rate-dependent cyclic deformation of NiTi SMAs.
Guozheng Kang, Chao Yu, Qianhua Kan
Chapter 6. Crystal Plasticity-Based Constitutive Models of NiTi SMAs
Abstract
In this chapter, the crystal plasticity-based constitutive models are proposed to describe the cyclic deformation of NiTi SMAs and its rate-dependence. The proposed models are firstly constructed for single crystals by considering different inelastic deformation mechanisms. Meanwhile, the thermo-mechanical coupling nature of rate-dependent cyclic deformation is addressed by considering the competition between the internal heat production and heat transfer to the ambient media. By employing an explicit scale transition rule, the proposed single crystal model is extended into the polycrystalline version, and then the rate-dependent cyclic deformation of NiTi SMAs are reasonably described by the proposed polycrystalline model.
Guozheng Kang, Chao Yu, Qianhua Kan
Chapter 7. Fatigue Life-Prediction Models of NiTi SMAs
Abstract
In this chapter, the damage evolution law and fatigue life prediction models are proposed for NiTi SMAs by addressing their superelasticity and shape memory effect, respectively. The proposed damage evolution law considered the damage coming from the microcrack orientation, propagation, martensite transformation, and martensite reorientation, and then reasonably reflected the damage accumulation process under the uniaxial, torsional, and multiaxial cyclic loadings. Moreover, the fatigue life prediction models based on the damage evolution law are also proposed, the predictive results for the uniaxial and multiaxial fatigue tests are all located within twice error band, and the accuracy of such models is much higher than those of the semiempirical ones.
Guozheng Kang, Chao Yu, Qianhua Kan
Backmatter
Metadaten
Titel
Thermo-Mechanically Coupled Cyclic Deformation and Fatigue Failure of NiTi Shape Memory Alloys
verfasst von
Guozheng Kang
Chao Yu
Qianhua Kan
Copyright-Jahr
2023
Verlag
Springer Nature Singapore
Electronic ISBN
978-981-9927-52-4
Print ISBN
978-981-9927-51-7
DOI
https://doi.org/10.1007/978-981-99-2752-4

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