摘要
介绍镍钛形状记忆合金发生应力诱发马氏体相变时的宏观失稳现象,研究微观晶粒内相变(材料失稳)因自催化效应逾渗到宏观水平所表现的类L櫣ders变形带演化(变形失稳),同步测量应力-应变响应、表面形貌和表面温度,跟踪了不同热-机械复合加载条件下构件力学行为的变化.从能量学角度对观察到的变形失稳现象进行理论分析.实验结果表明,宏观变形带的相貌演化与力学响应密切相关,探讨了建立该类材料的本构关系.
Macroscopic instability phenomena of NiTi shape memory alloy are reported during stress-induced martensitic phase transition. The research was focused on the evolution of Lüders-like band （deformation instability） due to microscopic phase transition in grains （material instability） percolating up to macroscopic level by self-catalysis. In the experiment, synchronized stress-strain response, surface morphology, and surface temperature were obtained; the mechanical behavior of the testing sample under thermomechanical combined loading was also investigated. The observed deformation instability phenomena were analyzed from the energetics point of view, and a close relation between the morphology evolution of the macroscopic deformation band and the mechanical response was found, indicating new orientation on the development of accurate constitutive relation of such material.
出处
《深圳大学学报（理工版）》
EI
CAS
北大核心
2007年第4期418-423,共6页
Journal of Shenzhen University(Science and Engineering)
基金
深圳大学科研启动基金资助项目(200633)
关键词
形状记忆合金
马氏体相变
变形失稳
形貌演化
本构关系
shape memory alloy
martensitic transformation
deformation instability
morphology evolution
constitutive relation
