TENSILE TEST AND PHYSICAL MODEL OF NiTi SHAPE MEMORY ALLOY  

NiTi形状记忆合金的拉伸实验与物理模型(英文)

作　　者：HUZi-li WANGXin-wei XIONGKe 

机构地区：[1]AeronauticalScienceKeyLaboratoryforSmartMaterialsandStructures,NUAA,29YudaoStreet,Nanjing,210016,P.R.China

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2004年第4期267-271,共5页南京航空航天大学学报（英文版）

基　　金：国家自然科学基金(10072026)资助项目;航空科学基金(01G52041)资助项目。~~

摘　　要：The tensile stress-strain curves of NiTi wires are obtained by tensile experiments under different heat treatments. A phenomenological physical model based on hysteresis element method is developed to describe the experimentally determined stress-strain curves of shape memory alloy (SMA) wires. Numerical simulations are made. Simulation results show that：(1) a series of unusual changes on physical and mechanical properties of SMA wires occur when martensitic, especially R (rhombohedral) phase transformation emerge. The stress-strain relation of SMA wires is highly non-linear; (2) there are no notable yielding phenomena before NiTi wires are broken; (3) numerical results obtained by the physical model are in good agreement with experimental data.The tensile stress-strain curves of NiTi wires are obtained by tensile experiments under different heat treatments. A phenomenological physical model based on hysteresis element method is developed to describe the experimentally determined stress-strain curves of shape memory alloy (SMA) wires. Numerical simulations are made. Simulation results show that: (1) a series of unusual changes on physical and mechanical properties of SMA wires occur when martensitic, especially R(rhombohedral) phase transformation emerge. The stress-strain relation of SMA wires is highly non-linear; (2) there are no notable yielding phenomena before NiTi wires are broken; (3) numerical results obtained by the physical model are in good agreement with experimental data.

关 键 词：SMA tensile test physical model numerical simulation constitutive relation 

分 类 号：TB381[一般工业技术—材料科学与工程]