It proves theoretically that the slip line family is just the slip surface family meeting the yieldcriteria.
在理论上证明，滑移线族就是满足屈服准则的滑动面族。
2
The basic properties of sintered powder materials in plastic deformation are explained. Some defects in present yieldcriteria of the materials are analysed.
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。
3
The in-plane stability formula of the lattice beam-columns derived from the edge yieldcriteria also applies to the castellated beam-columns, and the results are conservative.