The plastic theory of composite material include three criterions: the yield criterion, the flow rule and the hardening rule.
复合材料的塑性理论通常包括三方面准则：屈服准则、流动准则和强化准则。
This paper makes the optimum autofrettage analysis of thick-walled cylinder of the material with different yield strength in tension and compression base on the Mohr's yield criterion.
本文运用莫尔屈服准则对承受内压的拉压屈服强度不同材料的厚壁圆筒进行了自增强分析，得到了依赖于材料拉压比的厚壁圆筒的最佳弹塑性界面半径、最佳自增强内压。
Based on the yield criterion and plastic potential theories, a plastic constitutional relation, yield condition and yield curve equation in plane strain for powder metallurgical material were derived.
粉末冶金材料屈服条件是粉末冶金材料广义塑性理论的基础，其数学表达式对粉末冶金材料广义塑性理论方法的建立有重要影响。
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