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基于多孔体材料的塑性理论和体积可压缩的刚塑性有限元理论，通过数值模拟，并以Lee－Kuhn通过实验获得的局部应变极限准则为破裂条件，分析了摩擦因子、坯料高径比、坯料初始密度、模具型式和工件的形状等因素对形成表面裂纹的影响。
Based on the plastic theory of porous materials and the compressible rigid-plastic finite element theory, the numerical simulation and the local strain limit criterion obtained by Lee-Kuhn’s experiment are taken as the rupture conditions. The effects of friction factor, aspect ratio, Initial density, mold type and the shape of the workpiece and other factors on the formation of surface cracks.