CAJ | 학술논문

为定量描述镍钛形状记忆合金循环相变诱发塑性导致的超弹性退化行为，在广义粘塑性框架下对Graesser模型进行了拓展，考虑了奥氏体和马氏体弹性模量的差异以及马氏体非线性硬化行为，引入循环相变过程中相变应力和残余应变的演化方程，建立了超弹性NiTi合金循环相变诱发塑性本构模型，总结了模型参数确定方法。通过镍钛形状记忆合金微管的循环相变试验结果和模拟结果的对比表明，提出的模型能够很好地预测镍钛形状记忆合金的循环相变诱发塑性行为。
위정량묘술얼태형상기억합금순배상변유발소성도치적초탄성퇴화행위，재엄의점소성광가하대Graesser모형진행료탁전，고필료오씨체화마씨체탄성모량적차이이급마씨체비선성경화행위，인입순배상변과정중상변응력화잔여응변적연화방정，건립료초탄성NiTi합금순배상변유발소성본구모형，총결료모형삼수학정방법。통과얼태형상기억합금미관적순배상변시험결과화모의결과적대비표명，제출적모형능구흔호지예측얼태형상기억합금적순배상변유발소성행위。
To describe quantitative super-elasticity degradation behavior caused by the cyclic transformation in-duced plasticity of NiTi shape memory alloy,the Graesser model was extended in the frame of general visco-plasticity to consider the difference between austenite and martensite elastic moduli and the nonlinear hardening behavior of martensite.The evolution equations of transformation stress and transformation strain during cyclic transformation were introduced in the proposed model to capture the behavior of the cyclic transformation in-duced plasticity and the method of parameter calibration was provided.The comparison of experimental and simulated results of NiTi micro-tube subj ected to cyclic loading show that the proposed model can predict rea-sonably the cyclic transformation induced plasticity of NiTi shape memory alloy.