海绵橡胶非线性静动态力学特性和本构关系

Non linear static and dynamic mechanical properties and constitutive relation of sponge rubber

针对海绵橡胶的物理特性展开了准静态单轴压缩实验和分离式Hopkinson压杆动态压缩实验,得到海绵橡胶材料的应力-应变曲线,并对材料的应变率效应及材料的变形和破坏特性进行深入分析,在此基础上给出材料的动静态本构关系。结果表明:海绵橡胶材料在准静态加载下,应变大于0.3时,应力-应变曲线才开始偏离坐标轴,表现出非线性特征;在冲击载荷下,海绵橡胶的应变率效应并不明显。

Quasi static uniaxial compression test and SHPB dynamic compression experiments were carried out on the physical properties of sponge rubber. Basic mechanical parameters and stress strain curve of the rubber were obtained through experiments. The static and dynamic constitutive model was presented based on necessary analysis of deformation behavior of materials,strain rate effects and destruction properties. The results show that under quasi static loading with strain more than 0.3,stress strain curve begins to be off the coordinate axis and appears the nonlinear property;strain rate effect is not obvious under shock loading with the increase of strain rate.