一种新型变形可恢复SMA阻尼器力学性能的研究

Mechanical performances of a new type of resilient SMA damper

利用形状记忆合金(Shape Memory Alloy,简称“SMA”)丝材的超弹性与复位弹簧特性,开发出一种新型变形可恢复SMA阻尼器,以增强其变形可恢复的能力。同时,为了解决SMA丝材在实际工程中锚固难的问题,提出了一种新型可调节夹具,不仅解决了SMA丝材的不易锚固问题,而且增强了调节预应变的能力。对所提出的新型SMA阻尼器进行了循环加载试验研究和数值仿真分析,探讨不同加载频率及位移幅值对其力学性能的影响,建立了恢复力模型。结果表明:新型SMA阻尼器在循环荷载作用下滞回性能稳定,具有良好的耗能性能;内置弹簧对新型SMA阻尼器变形可恢复能力有较大帮助。基于所建立恢复力模型的数值模拟结果与试验结果符合情况很好,验证了阻尼器恢复力力模型的正确性。

A new type of resilient shape memory alloy(SMA)damper is developed based on the superelasticity of SMA and the re-centering property of springs to improve the deformation resilient capacity.Meanwhile,a new kind of adjustable fixture for the SMA wire is put forward to solve the fixed problem of SMAs in practical engineering,not only solving the difficult anchorage issue of SMA wire,but also enhancing the adjustable prestrain capacity.A cyclic loading test and a numerical simulation are performed for the new proposed SMA damper to develop the impact of different loading frequencies and displacement amplitudes on its mechanical properties,and a resilient model is also established.The results show that the new resilient damper has a stable hysteretic performance and good energy dissipation capability under cyclic loading.The inserted springs have a great help for the resilient capability of the SMA damper.The numerical results based on the proposed resilient mechanical model well accord with the experimental results,validating the correctness of the proposed resilient mechanical model.