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依据金属橡胶典型细观结构特征,对金属橡胶压缩变形金属线匝的空间位形和接触模式进行了分析,揭示了金属橡胶变形的细观物理机制。提出了基于变长度曲梁的细观结构单元以及曲梁间的接触作用模型,结合摩擦接触点分布规律,建立了包含金属丝直径、金属丝弹性模量、螺旋卷直径、金属橡胶相对密度等基本结构参数的金属橡胶迟滞特性本构模型,实现了金属橡胶初始加载、卸载和重复加载过程恢复力曲线的描述,从理论上解释了金属橡胶的弹性性能和多点接触的干摩擦阻尼特性。通过不同相对密度金属橡胶试件对所建模型进行试验验证,发现理论预测和试验结果基本一致,为金属橡胶刚度和阻尼的预估以及产品的设计提供了理论依据。
According to the typical microstructure characteristics of metal rubber, the spatial configuration and contact pattern of metal rubber compression-deformed metal turns were analyzed, and the meso-physical mechanism of metal rubber deformation was revealed. The mesostructural elements based on variable length curved beam and the contact action model between curved beams are presented. Combined with the distribution rule of frictional contact points, the model including the wire diameter, the elastic modulus of the wire, the spiral coil diameter, the relative density of metal rubber The basic structural parameters of metal rubber hysteresis constitutive model to achieve the metal rubber initial loading, unloading and repetitive loading process of the restoration force curve description, the theoretical interpretation of the elastic properties of metal rubber and multi-point contact dry friction damping characteristics. Experimental results show that the theoretical prediction and test results are basically the same, which provides a theoretical basis for the prediction of the stiffness and damping of metal rubber and the design of the product.