A Multi-mechanism Model Describing Reorientation and Reorientation-Induced Plasticity of NiTi Shape Memory Alloy
A Multi-mechanism Model Describing Reorientation and Reorientation-Induced Plasticity of NiTi Shape Memory Alloy作者机构：State Key Laboratory of Traction Power Southwest Jiaotong University Chengdu 610031 China Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and Engineering Southwest Jiaotong University Chengdu 610031 China
出 版 物：《Acta Mechanica Solida Sinica》 (固体力学学报（英文版）)
年 卷 期：2018年第31卷第4期
页 面：445-458页
核心收录：
学科分类：0821[工学-纺织科学与工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 082101[工学-纺织工程] 0701[理学-数学] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学]
基 金：Financial supports by the National Natural Science Foundation of China （Nos. 11572265 11532010） the Excellent Youth Found of Sichuan Province （No. 2017JQ0019）
主 题：Shape memory alloy Shape memory effect Residual strain Constitutive model Plastic strain
摘 要：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 reorien- ration 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.
维普期刊数据库