Experimental study on temperature evolution and strain rate effect on phase transformation of TiNi shape memory alloy under shock loading

2019 ◽  
Vol 156 ◽  
pp. 342-354 ◽  
Author(s):  
Yonggui Liu ◽  
Lingyan Shan ◽  
Junfang Shan ◽  
Mengmeng Hui
Keyword(s):  
Experimental Study ◽  
Phase Transformation ◽  
Shape Memory Alloy ◽  
Strain Rate ◽  
Shape Memory ◽  
Shock Loading ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Temperature Evolution

Constitutive Model of Shape Memory Alloys: One-Dimensional Phase Transformation Model

2008 ◽  
Vol 56 ◽  
pp. 84-91
Author(s):  
Tadashige Ikeda
Keyword(s):  
Phase Transformation ◽  
Constitutive Model ◽  
Shape Memory Alloys ◽  
Strain Rate ◽  
Shape Memory ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Reverse Transformation ◽  
Stress Strain ◽  
One Dimensional

A simple yet accurate macroscopic constitutive model of shape memory alloys has been developed. The features of this model are (1) energy-based phase transformation criterion, (2) one-dimensional phase transformation rule based on a micromechanical viewpoint, (3) dissipated energy with a form of a sum of two exponential functions, (4) duplication of the strain rate effect, and (5) adaptability to multi-phase transformation. This model is further improved to be able to express stress-strain relationships such that the reverse transformation starts at a higher stress than the martensitic transformation starts. Here, the ideal reversible transformation temperature is empirically described by a function of the martensite volume fraction. In this paper, an outline of our model is given, where the improvement is introduced. Then, it is shown that the model can quantitatively duplicate the major and minor hysteresis loops, strain rate effect, and asymmetry in tension and compression on the stress-strain relationship. And that it can also duplicate the stress-strain relationships having the reverse transformation start stress higher than the forward one.

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