高阻尼黏弹性阻尼器性能与力学模型研究

Performance and mechanical model of high damping viscoelastic dampers

对2个高阻尼黏弹性阻尼器进行不同应变幅值、加载频率下的力学性能试验和疲劳性能试验,研究试件在不同工况下的最大剪应力、存储剪切模量、损耗剪切模量和等效黏滞阻尼比等力学性能及其变化规律,提出五单元模型模拟黏弹性阻尼器的滞回性能。研究结果表明:黏弹性阻尼器滞回曲线饱满、稳定,具有较高的等效黏滞阻尼比,表现出良好的变形性能和耗能能力;黏弹性阻尼器力学性能与应变幅值的相关性明显,与加载频率相关性较小,抗疲劳性能较好;五单元模型模拟的滞回曲线与试验滞回曲线吻合良好。

An experimental study on two high damping viscoelastic dampers were presented. Maximum shear stress, storage shear modulus, loss shear modulus and equivalent viscous damping ratio were measured under different loading schemes in order to study the variation of the viscoelastic damper properties. Sinusoidal loading schemes with different displacement and frequency control were used. The mechanical properties of the dampers under various strain amplitudes and loading frequencies were investigated. Fatigue test was also conducted. The non-linear hysteretic behavior of the viscoelastic damper was similated by adopting a five unit model. The results show that the hysteresis curves of this kind of high damping viscoelastic dampers are plump and stable. The equivalent viscous damping ratios of viscoelastic dampers are higher, and their deformation property, energy dissipation capacity and anti-fatigue property are good. The dependency of the damper＇ s mechanical properties on strain amplitude is relatively significant, while that on frequency is small The simulating hysteretic curves with the five unit model are identical to the test results.