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研制一种兼具自复位功能和高耗能的形状记忆合金复合摩擦阻尼器(Hybrid Shape Memory Alloys Friction Damper,简写为HSMAFD),该阻尼器由超弹性形状记忆合金丝复位装置和摩擦耗能装置组成。制作了HSMAFD模型,并通过试验研究了HSMAFD在循环荷载作用下的力学性能,考察了初始应变、位移幅值、摩擦力和加载频率对其力学性能的影响。基于改进的Graesser&Cozzarelli模型和Bouc-Wen模型,分别建立复位装置和摩擦装置恢复力模型,并对其力学性能进行了数值模拟。研究结果表明:HSMAFD在循环荷载作用下具有稳定的滞回特性、良好的耗能和自复位能力,且其滞回和自恢复性能可以通过调节超弹性形状记忆合金丝的初始应变和摩擦力而改变;数值模拟结果和试验结果吻合较好,验证了恢复力模型的正确性。
A Hybrid Shape Memory Alloys Friction Damper (HSMAFD) with self-resetting function and high energy dissipation is developed. The damper is composed of a superelastic shape memory alloy wire reset device and a friction dissipating device composition. The HSMAFD model was made and the mechanical properties of HSMAFD under cyclic loading were studied. The effects of initial strain, displacement amplitude, friction force and loading frequency on the mechanical properties of HSMAFD were investigated. Based on the improved Graesser & Cozzarelli model and the Bouc-Wen model, the restoring force models of the restoring device and the friction device were established, and their mechanical properties were numerically simulated. The results show that HSMAFD has stable hysteresis characteristics, good energy dissipation and self-resetting ability under cyclic loading, and its hysteresis and self-recovery performance can be adjusted by adjusting the initial strain and friction force of the super-elastic shape memory alloy wire The results of numerical simulation agree well with the experimental results, which verify the correctness of the restoring force model.