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金属橡胶作为一种新型阻尼材料,其原材料及加工工艺具有一定特殊性.基于材料的细观结构特征,选取了金属丝螺旋卷作为金属橡胶的基本微元体结构,并以圆柱压缩螺旋弹簧理论为基础,分别建立了横向和纵向排列微元体结构的刚度.鉴于库仑摩擦模型,分别建立三种接触状态螺旋卷接触对的力学模型.考虑整个加工工艺流程的特点,分析了不同接触状态数目变化规律,建立了金属橡胶迟滞特性本构模型.从理论上解释了金属橡胶迟滞特性的特点,以及刚度和阻尼非线性的产生机理.最后,通过对比不同相对密度金属橡胶试件的理论和试验结果,验证了理论模型的适用性.本模型从螺旋卷微元体结构上描述了金属橡胶迟滞特性,为工程上预测和分析金属橡胶的刚度、阻尼特性和设计金属橡胶产品提供了有效的理论基础.
As a new kind of damping material, metal rubber has its own particularity in its raw materials and processing technology.According to the mesostructural characteristics of the material, the wire spiral coil is selected as the basic micro-body structure of the metal rubber, and the cylindrical compression coil spring theory , Respectively, the stiffness of the micro-structure was arranged horizontally and vertically, respectively.According to the Coulomb friction model, the mechanical models of three contact states were established respectively.Considering the characteristics of the entire processing flow, the number of different contact states The constitutive model of hysteresis of metal rubber was established, and the characteristics of hysteresis of metal rubber and the mechanism of stiffness and damping nonlinearity were explained theoretically.Finally, by comparing the theory and test of metal rubber specimens with different relative density As a result, the applicability of the theoretical model is verified.This model describes hysteresis characteristics of metal rubber from the structure of spirally wound micro-bodies and provides an effective theory for engineering prediction and analysis of the stiffness and damping characteristics of metal rubber and the design of metal rubber products basis.