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Acta Mechanica Solida Sinica

, Volume 31, Issue 4, pp 445–458 | Cite as

A Multi-mechanism Model Describing Reorientation and Reorientation-Induced Plasticity of NiTi Shape Memory Alloy

  • Xiang Xu
  • Bo Xu
  • Han M. Jiang
  • Guo-zheng Kang
  • Qian-hua Kan
Article

Abstract

The recovery force or recovery strain is an important indicator of NiTi-based shape memory alloy devices. However, the restoring force or recoverable strain is partially restrained due to an interaction between reorientation and reorientation-induced plasticity. Therefore, a macroscopic multi-mechanism constitutive model was constructed to describe the degeneration of shape memory effect based on the phase diagram. The residual strain after cooling consists of reorientation strain and reorientation-induced plastic strain. An internal variable, i.e., the detwinned stress, and its evolution equation were introduced into the transformation kinetics equation to describe the nonlinear hardening characteristics induced by the combined reorientation and detwinning mechanisms during mechanical loading. Finally, the proposed model was numerically implemented to simulate the experiments of shape memory effect at different peak strains. Comparisons between the experimental and simulated results show that the proposed model can reasonably describe the degeneration of shape memory effect.

Keywords

Shape memory alloy Shape memory effect Residual strain Constitutive model Plastic strain 

Notes

Acknowledgements

Financial supports by the National Natural Science Foundation of China (Nos. 11572265, 11532010), the Excellent Youth Found of Sichuan Province (No. 2017JQ0019), the Open Project of Traction Power State Key Laboratory (TPL1606) and the Exploration Project of Traction Power State Key Laboratory (2017TPL T04) are acknowledged.

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Copyright information

© The Chinese Society of Theoretical and Applied Mechanics and Technology 2018

Authors and Affiliations

  • Xiang Xu
    • 1
  • Bo Xu
    • 1
  • Han M. Jiang
    • 1
  • Guo-zheng Kang
    • 1
    • 2
  • Qian-hua Kan
    • 1
    • 2
  1. 1.State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengduChina
  2. 2.Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengduChina

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