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形状记忆合金橡胶是一种具有复杂多孔结构的隔振和减振阻尼材料,根据其微观结构进行层状分解,结合试块压缩刚度非线性特征得到其力学本构模型。通过引入微曲梁接触对单元,建立模型物理量与材料细观及工艺参数之间的关系,得到形状记忆合金橡胶基本单元的接触刚度;由试件非线性刚度分析得到加载、卸载过程中材料内部微曲梁接触点数量的变化,进而建立形状记忆合金橡胶层状压缩本构模型。结果表明:该模型可以考虑形状记忆合金橡胶的材料参数、加工工艺参数以及加、卸载过程中静摩擦力和滑动摩擦力的影响,更接近形状记忆合金橡胶内部微弹簧线匝的受力状态;参数分析结果表明,形状记忆合金橡胶的弹性模量随着名义密度、形状记忆合金丝直径和摩擦系数的增大而提高。
Shape memory alloy rubber is a kind of damping and vibration damping material with complex porous structure. According to the microstructure of the shape memory alloy, the mechanical deformation model is obtained by combining the nonlinear characteristics of the compression stiffness of the specimen. The contact stiffness of the basic unit of the shape memory alloy rubber was obtained by introducing the contact of the micro-bent beam to the element, the relationship between the physical quantity of the model and the mesoscopic and technological parameters of the material, and the contact stiffness of the basic unit of the shape memory alloy rubber was obtained. The number of micro-curved beam contact point changes, and then build the shape memory alloy rubber laminated compression constitutive model. The results show that the model can consider the material parameters, processing parameters and the static friction and sliding friction in the process of loading and unloading, which is closer to the stress state of the turns of the microscopic spring within the shape memory alloy rubber. The parameters The analysis results show that the elastic modulus of shape memory alloy rubber increases with the increase of nominal density, shape memory alloy wire diameter and friction coefficient.