超弹性NiTi形状记忆合金棒力学性能研究  

Research on Mechanical Performance of Superelastic NiTi Shape Memory Alloy Bars

作　　者：庄鹏[1,2] 薛素铎[3] 韦捷亮 刘雨冬 

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]北京建筑大学工程结构与新材料北京高等学校工程研究中心,北京100044 [3]北京工业大学建筑工程学院,北京100124

出　　处：《建筑科学与工程学报》2015年第1期96-103,共8页Journal of Architecture and Civil Engineering

基　　金：北京市自然科学基金资助项目(8132024);北京市优秀人才培养资助项目(2011D005017000006)

摘　　要：研制了具有2种化学成分的超弹性NiTi形状记忆合金(NiTi SMA)圆截面棒材,并对其进行了力学性能试验研究,分析了应变幅值、加载速率对2种SMA棒的应力-应变曲线以及等效刚度、单位循环耗能、等效阻尼比和残余应变等力学性能参数的影响。通过有限元软件对SMA棒的力学性能进行了数值模拟,并对比了有限元模拟结果与试验结果。结果表明:超弹性SMA棒可提供较大的输出力和良好的复位性能,适合作为复位部件及辅助耗能部件用于工程结构的减振控制;数值模拟结果和试验结果吻合较好,采用有限元方法可较为准确地模拟超弹性SMA棒的力学性能。NiTi superelastic shape memory alloy （SMA） circular section bars with two types of chemical compositions were developed ,and the mechanical performance tests were carried out . The influences of strain amplitude ,loading rate on the stress‐strain curve and the performance parameters such as equivalent stiffness ,energy dissipation per cycle ,equivalent damping ratio and residual strain of the two SMA bars were analyzed .The mechanical performance of SMA bars was simulated by finite element software ,and the simulated results were compared with the test results .T he results indicate that the developed superelastic SMA bars are suitable for the re‐centring and supplementary energy dissipation components in seismic control due to their large output force and excellent superelastic effect . The numerical results agree well with the test results ,and the finite element method can accurately simulate the mechanical performance of SMA bars .

关 键 词：形状记忆合金棒 标准试件 超弹性 复位能力 力学性能 

分 类 号：TU352.1[建筑科学—结构工程]