航空材料学报2018，Vol.38Issue(1)：26-32,7.DOI:10.11868/j.issn.1005-5053.2017.000019
NiTi合金的相变-塑性统一本构模型与数值算法
Unified Constitutive Model and Numerical Implementation of NiTi Alloy Involving Phase Transformation and Plasticity
摘要
Abstract
In order to actually describe the mechanical behavior of phase transformation and plasticity for NiTi shape memory alloy (SMA),the master equations which based on irreversible thermodynamics theory was derived by assuming two internal variables to characterize phase transformation evolution and plastic evolution. Thus a unified constitutive model was developed by summarizing mas-ter equations of phase transformation and plasticity in the loading process of NiTi alloy. Adopting semi-implicit stress integration algo-rithm to update inelastic strain increment,the phenomenological-based constitutive model was numerically implemented with FORTRAN code. The numerical simulation results were in good agreement with experimental data so that the proposed model validation was con-ducted. The results show that the proposed model not only can describe well the different deformation stages of NiTi alloy,but also the constitutive behaviors subjected to different strain rates. And it provides the basis for the practical application of NiTi alloy in the condi-tion of impact and high speed cutting.关键词
形状记忆合金/相变-塑性行为/本构模型/半隐式应力积分Key words
shape memory alloy/phase transformation and plastic behavior/constitutive model/semi-implicit stress integration algo-rithm分类
矿业与冶金引用本文复制引用
李云飞,陈成,曾祥国..NiTi合金的相变-塑性统一本构模型与数值算法[J].航空材料学报,2018,38(1):26-32,7.基金项目
国家自然科学基金委员会与中国工程物理研究院联合NSAF基金资助项目(U1430119) （U1430119）
