正确认识粉末烧结材料屈服函数形状和性质，对于其塑性变形分析有重要意义。
It is important to plastic deformation analysis for we to understand correctly the geometrical form and properties of yield function of sintered powder materials.
分析了粉末烧结材料镦粗和复压工艺的致密效果，提出了闭式模锻工艺设计原则。
The densification effects of upsetting and repressing are compared, and a technology design principle for closed die forging is suggested .
阐述了粉末烧结材料塑性变形的基本性质，分析了粉末烧结材料现有屈服条件中存在的问题。
The basic properties of sintered powder materials in plastic deformation are explained. Some defects in present yield criteria of the materials are analysed.
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