中文摘要：

提出一种二维非线性弹塑性质量-弹簧-连杆模型，该模型将泡沫金属材料离散成许多质量块，质量块在受载方向由非线性弹塑性弹簧连接，垂直于受载方向由可延伸的弹性连杆铰接。采用该模型模拟并分析了层非均匀泡沫金属材料及局部不均匀泡沫金属材料在冲击载荷下的变形特性，说明了非均匀性对泡沫金属材料冲击变形的影响。

英文摘要：

A two-dimensional nonlinear mass-spring-bar model is presented in this paper to simulate the deformation of metallic foams with heterogeneous density in layers or in local regions. The metallic foam is modeled as an array of discrete lump masses linked with elastic-plastic springs in the loading direction and constrained by hinged extensible rods transversely to the loading direction. The effects of the heterogeneity in metallic foams on their deformation under impact have been analysed.