基于金属粉末压制模型的韧性损伤模型

Ductile damage criterion based on metal powder compacting model

以Lee多孔材料屈服模型为基础 ,并假设空穴密度积累到一临界值时 ,材料出现裂纹 ,推导出适用于多孔材料的韧性损伤模型。该模型描述了在应力、应变、密度分布及其积累因素影响下 ,材料的损伤状态。使用该模型可以跟踪整个加载过程中多孔材料各点的损伤状况和破裂过程。

Based on Lee's plastic yield function for porous material, and hypothesis that fracture initiation occurs when the void density is accumulated to a critical value,a new ductile damage model for porous material was derived. With it, it can be studied the scent of damage status and cracking process of porous material in the whole load process.