A micromechanical constitutive model for grain size dependent thermo-mechanically coupled inelastic deformation of super-elastic NiTi shape memory alloy

2018 ◽  
Vol 105 ◽  
pp. 99-127 ◽  
Author(s):  
Chao Yu ◽  
Guozheng Kang ◽  
Qianhua Kan
Keyword(s):  
Grain Size ◽  
Shape Memory Alloy ◽  
Constitutive Model ◽  
Shape Memory ◽  
Inelastic Deformation ◽  
Niti Shape Memory Alloy ◽  
Size Dependent

A uniaxial constitutive model for NiTi shape memory alloy bars considering the effect of residual strain

2019 ◽  
Vol 30 (8) ◽  
pp. 1163-1177
Author(s):  
Canjun Li ◽  
Zhen Zhou ◽  
Yazhi Zhu
Keyword(s):  
Shape Memory Alloy ◽  
Constitutive Model ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Residual Strain ◽  
Hysteretic Behavior ◽  
Niti Shape Memory Alloy ◽  
Strain Effect ◽  
Proposed Model ◽  
Residual Strains

Super-elastic shape memory alloys are widely used in structural engineering fields due to their encouraging super-elasticity and energy dissipation capability. Large-size shape memory alloy bars often present significant residual strains after unloading, which emphasizes the necessity of developing a residual strain effect–coupled constitutive model to predict well the performance of shape memory alloy–based structures. First, this article experimentally studies the hysteretic behavior of NiTi shape memory alloy bars under quasi-static loading conditions and investigates the effects of cyclic numbers and strain amplitudes on residual strain. Second, a concept of cumulative transformation strain is preliminarily introduced into a phenomenological Lagoudas model. A uniaxial constitutive model for shape memory alloy bars including the residual strain is proposed. By using OpenSees platform, numerical simulations of shape memory alloy bars are conducted—the results of which indicate that the proposed model can accurately capture the hysteretic behavior of shape memory alloys. The predicted residual strains show a good agreement to experimental results, which demonstrates the desirable efficiency of the proposed model.

Constitutive model taking into account the strain rate for uniaxial NiTi shape memory alloy under low velocity impact conditions

2008 ◽  
Vol 17 (6) ◽  
pp. 065033 ◽  
Author(s):  
Flores Imanol ◽  
Zurbitu Javier ◽  
Aretxabaleta Laurentzi ◽  
Castillo Germán ◽  
Aurrekoetxea Jon ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Constitutive Model ◽  
Strain Rate ◽  
Shape Memory ◽  
Low Velocity Impact ◽  
Niti Shape Memory Alloy ◽  
Low Velocity ◽  
Velocity Impact
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