The basic plastic deformation laws of compressible sintered powder materials such as volume change, mass constancy, small Poisson ratio, hydrostatic stress affecting on yield etc. are analyzed.

• 摘要本文分析了粉末烧结材料塑性变形的基本规律，指出了现在粉末烧结材料屈服条件与实际情况不相符的问题。