通过滞回性能实验研究了大尺寸 TiNi 形状记忆合金(TiNi SMA)螺旋弹簧用于结构振动控制的可行性。利用两种 TiNi 合金制作了大尺寸超弹性螺旋弹簧试件。对 TiNi 弹簧试件进行了单轴反复荷载作用下的力学实验，获得了其在不同加载条件下的恢复力-位移曲线。分析了不同循环加卸载次数、加载频率、位移幅值对两种 TiNi 弹簧的滞回环及等效刚度、单位循环耗能、等效阻尼比和残余位移4个力学参数的影响。研究结果表明，超弹性TiNi弹簧可提供较大的恢复力、位移以及稳定的复位性能，并具有一定的耗能能力，在工程结构自复位振动控制中具有较好的应用潜力较好。
The feasibility of the large scale TiNi shape memory alloy (TiNi SMA)spring for structural control was studied through hysteretic performance test.First,two types of large scale superelastic TiNi helical spring with the same sizes but different materials are designed and fabricated.Then,the restoring force-displacement curves of such superelastic springs under different loading conditions are obtained by conducting a set of cyclic tension-compression tests.Finally,the influence of the cyclic number,the loading frequency and the displace-ment amplitude on the hysteresis loops and the mechanical parameters such as equivalent stiffness,energy dissi-pation per cycle,equivalent damping ratio and residual displacement are analyzed.The experimental program demonstrates that the large scale TiNi springs provide stable hysteretic response with appreciable energy dissi-pation,re-centering ability,and large displacement capability and nonlinear restoring force.In summary,the TiNi springs exhibit great potential in re-centering control of engineering structures.
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