对于油缸承受内压的情况,在缸头与缸体焊接处附近的应力状态较为复杂,而在离焊缝较远处,可以将其考虑为平面应变问题。通过对受内压厚壁缸筒的应力变形公式的归结,并根据弹性力学理论,推导得出厚壁缸筒截面开孔应力集中影响的解析表达。并辅以有限元方法加以验证。 For the cylinder to withstand internal pressure, the stress state near the weld between the cylinder head and the cylinder body is more complicated, while at a distance from the weld, it can be considered as a plane strain problem. Based on the summary of the stress and deformation formulas of thick-walled cylinder under internal pressure and according to the theory of elastic mechanics, the analytical expression of stress concentration in the thick-wall cylinder section is derived. And supplemented by finite element method to be verified.