中文摘要：

对超弹性形状记忆合金（SMA）棒进行力学性能实验，研究了荷栽循环、应变幅值和荷载频率对其滞回曲线以及耗能量、损耗因子、残余应变的力学参数的影响。结果表明，应力一应变曲线在循环加卸载中逐渐变化并趋于稳定；耗能量和损耗因子均随应变幅值的增加而增加，随荷载频率的增加而减小；稳定的SMA棒的超弹性、耗能能力和阻尼性能均较差，但其输出力较大，故可作为复位或限位装置用于土木工程中。

英文摘要：

Experiments on the mechanical behavior of the superelastic SMA bar are performed. Cyclic number, strain amplitude and loading frequency are considered to investigate their effects on the hysteretic curve and the mechanical parameters, such as energy dissipation per cycle, loss factor and residual strain. The results show that the stress-strain curve changes gradually to reach an approximately steady state with the increasing number of loading cycles. As strain amplitude increases, the energy dissipation and the loss factor increase. As loading frequency increases, the energy dissipation and the loss factor decrease. The steady superelastic SMA bar has the poor capabilities of superelasticity, energy dissipation and damping property, so the material can be used as recentering devices or restrainers in the civil engineering.