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利用2种镍钛形状记忆合金(SMA)研制了大尺寸超弹性螺旋弹簧,对其进行了单轴反复荷载作用下的滞回性能试验,研究了超弹性SMA螺旋弹簧的恢复力特性与耗能能力,分析了加载频率、位移幅值对2种SMA螺旋弹簧滞回曲线以及等效刚度、单位循环耗能、等效阻尼比和残余位移等力学性能参数的影响;采用刚弹性模型和Bouc-Wen模型,建立了适用于整体结构分析的SMA螺旋弹簧简化恢复力模型,并利用该模型进行了数值模拟。结果表明:超弹性SMA螺旋弹簧具有稳定的滞回曲线,且具有良好的复位性能和大变形能力,可用于结构自复位控制装置的研发;数值模拟结果与试验结果吻合较好,验证了简化恢复力模型的正确性。
A large-size hyperelastic coil spring was fabricated by using two kinds of nickel-titanium shape memory alloy (SMA). The hysteretic behavior of the large-size hyperelastic coil spring under uniaxial repeated loading was studied. The recovery characteristics and energy dissipation of the super-elastic SMA coil spring The influence of loading frequency and displacement amplitude on the hysteretic curves of two types of SMA coil springs and the mechanical parameters such as equivalent stiffness, energy consumption per unit cycle, equivalent damping ratio and residual displacement were analyzed. The rigid-elastic model and Bouc- Wen model, a simplified restoring force model of SMA coil spring for structural analysis is established and numerically simulated with this model. The results show that the Hyperelastic SMA coil spring has a stable hysteresis curve and good reset performance and large deformation capacity. It can be used in the research and development of structure self-reset control devices. The numerical simulation results agree well with the experimental results, Correctness of the force model.