应变幅值对循环载荷下NiTi合金力学性质的影响  

On the Influence of Strain Amplitude on Mechanical Properties of Niti Alloy Subjected to Cyclic Loading

作　　者：张振华[1] 刘宁[1] 绳飘[1] 张爱蒙 薛飞[1] ZHANG Zhen-hua LIU Ning SHENG Piao ZHANG Ai-meng XUE Fei(School of Civil Engineering of Henan Polytechnic University, Jiaozuo 454000, Henan, China School of Mechanics, Civil Engineering and Architecture of Northwestern Polytechnical University, Xiran 710072, Shanxi, China)

机构地区：[1]河南理工大学土木工程学院,河南焦作454000 [2]西北工业大学力学与土木建筑学院,陕西西安710072

出　　处：《实验力学》2017年第3期407-413,共7页Journal of Experimental Mechanics

基　　金：国家自然科学基金资助项目(51308195);河南省科技厅科技攻关项目(132102210252)

摘　　要：实验研究了应变幅值对循环载荷下NiTi合金伪弹性退化特征的影响规律,结果表明:当卸载发生在NiTi合金应力诱发马氏体相变阶段时,应变幅值对马氏体相变开始应力的退化规律影响较小,但此时应变幅值的增加会显著增大奥氏体弹性模量的退化程度,而其大变形可回复能力和阻尼特性在应变幅值大于6%时才有大幅度降低。对各参数退化程度进行定量分析,得到了NiTi合金具有较强可回复能力和阻尼性能的应变幅值范围。该研究可为NiTi合金阻尼器的设计提供参考。The influence of strain amplitude on pseudoelasticity degradation characteristics of NiTi alloy subjected to cyclic loading was experimentally studied.Results indicate that when the unloading occurs on the stage of NiTi alloy martensite transformation,which is induced by stress,strain amplitude has little influence on degradation characteristics at the beginning of the martensitic transformation;but at the same time,the increase of strain amplitude may significantly increase the degradation degree of austenite elastic modulus;and the large deformation resilience and damping capability can be reduced significantly only when the strain amplitude is larger than 6%.Through quantitative analysis of degradation degree,the strain amplitude range corresponding strong resilience and damping property of NiTi alloy was obtained.Above results can provide reference for design of NiTi alloy damper.

关 键 词：形状记忆合金 NITI合金 伪弹性 应变幅值 循环载荷 

分 类 号：TB381[一般工业技术—材料科学与工程] TU502.6[建筑科学—建筑技术科学]