The drawing process of thick wall is a problem of geometry non-linear and material non-linear, so it is very difficult to be solved by the method of elasticity and plastics mechanics.
而厚壁封头冲压成形过程属于几何非线性和材料非线性的问题，很难用弹塑性力学理论的解析法进行研究。
2
This paper makes the Autofrettage analysis of thick wall spherical shell of linear strength material based on unified strength theory.
采用俞茂宏统一强度理论分析了厚壁圆筒和厚壁球壳的极限荷载，得出了统一解形式。
3
This paper performs the limit analysis of a thick wall cylinder of linear strengthened material based on the unified strength theory.