静动力荷载下不锈钢丝金属橡胶的剪切力学性能

Shear Mechanical Properties of Stainless Steel Metal Rubber Under Actions of Static and Dynamic Loads

为研究金属橡胶材料用作隔震器在水平方向承受剪切荷载的性能,对不同成型密度的金属橡胶试件进行静力、动力剪切荷载性能试验,测试成型密度、加载幅值、循环加载次数、动力加载频率、成型工艺等因素对金属橡胶材料剪切滞变性能的影响规律,同时进行大幅值剪切破坏试验,分析极限变形能力。结果表明:改进剪切成型工艺后,金属橡胶材料剪切性能提高;其滞变耗能能力随成型密度、加载幅值的增加而增大,与加载频率和加载次数无关。应力-应变曲线加载段近似于线性,剪切刚度和等效阻尼比随剪切应变幅值的增大而减小,可回复变形达80%。

A mechanical property test was performed on metal rubber specimens of various molding densities under static and dynamic shear loading conditions in order to investigate properties of stainless steel metal rubber used as isolators under shear loading in horizontal direction. Effects of molding density, strain amplitude, cyclic number, speed of loading and molding process on the mechanical properties of metal rubber were analyzed. Moreover, a shear failure test under large amplitude was carried out to study the limiting deformation capacity of the specimens. Results indicate that the shear mechanical properties of the metal rubber increase under the improved shear molding process. The energy dissipation capability of the met＇,d rubber increases with increasing nominal density and strain amplitude, while frequency and cyclic number of applied load have little influence on the properties of the metal rubber. The loading section of stress-strain curve is approximately linear. The shear stiffness and equivalent damping ratio decrease with increasing shear strain amplitude, and the recovery strain is up to 80%.