金属橡胶非线性干摩擦副的接触作用机理及其仿真结果分析

Contacting mechanism of nonlinear friction pair for metallic rubber and its simulation results

从金属橡胶材料的干摩擦阻尼产生的机理入手,提出了一种全新的金属橡胶非线性干摩擦结构单元力学模型,该结构单元由一对带有轴向和径向两个方向的弹性元件构成,它们既表示了金属丝之间的摩擦特性,同时也表示了螺线卷线匝在受力变形时的弹性特征。以建立的金属橡胶材料力学模型为基础,采用多个摩擦副单元串联组成的结构,深入研究了线匝的摩擦接触,通过对结构单元组成系统的计算机模拟仿真,对金属橡胶元件在不同载荷作用下的滞迟回线进行了深入地分析和研究,在静态载荷作用下,研究了结构单元的摩擦系数、结构单元的摩擦角对金属橡胶结构摩擦耗能的影响,在动态载荷作用下,研究了载荷的幅值、载荷的频率、载荷的初始相位对摩擦耗能的影响,此项研究工作大大减少了静态和动态试验方面的工作。

From dry-friction damping mechanism of metallic rubber,a new mechanical model for nonlinear friction structure element of metallic rubber was put forward.The structural element was made up of axial and radial elastic elements.The two elements not only denoted friction characteristics among wires,but also elastic properties of spiral turns.Based on the mechanical model constructed,using a series connection structure with multiple friction pairs,friction contacts between turns were studied.Through simulation for the system with the structural elements,hysteresis loops were deeply analyzed and studied under different loading for metallic rubber elements.Under static loading,the effects of friction coefficient and friction angle on energy dissipation of metallic rubber were studied,and under dynamic loading the effects of force＇s amplitude,frequency and initial phase on energy dissipation were also studied,the studies largely reduced the efforts for static and dynamic experiments.