Modeling of isothermal stress cycling degradation of shape memory alloys using non-constant material parameters
Experimental investigations on superelastic shape memory alloy (SMA) wires subjected to isothermal stress cycling show significant performance degradations,including the accumulation of the plastic strain,the reduction of the maximum transformation strain and the evolution of the transformation temperatures.The cyclic degradation of SMAs must be carefully studied and understood when the alloys are used in the SMA based actuators and vibration isolators.Motivated by these issues,the present work aims to develop a comprehensive approach for the cyclic behavior of SMAs taking into account degradations caused by isothermal stress cycling in the superelastic regime.The new cyclic constitutive model is constructed based on the thermodynamic frame proposed by Boyd and Lagoudas,and evolution laws for the plastic strain as well as non-constant material parameters including the maximum transformation strain and four transformation temperatures are also constructed.Finally,numerical simulations based on the proposed constitutive model are also performed in our work,and good correlations are observed.
Shape Memory Alloys Cyclic Degradation Constitutive Model Non-constant Material Parameters
Xiaoyong ZHANG Xiaojun YAN Huimin XIE
AML,School of Aerospace,Tsinghua University,Beijing,100084,China School of Energy and Power Engineering,Beihang University,Beijing 100191,China
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）