基于统一强度理论的组合厚壁圆筒弹塑性统一解

基于统一强度理论，考虑中间主应力效应及拉压不等特性，对双层和多层厚壁圆筒进行弹塑性分析，分别建立了材料相同双层厚壁圆筒最佳分层半径、套装压力和套装过盈量的基本解，以及组合厚壁圆筒的弹塑性统一解，得出统一强度理论参数、拉压比、半径比和组合筒体层数对统一解的影响特性。该结果具有通用性，适用于拉压异性组合厚壁圆筒压力容器的相关问题；考虑中间主应力的影响，能充分发挥组合筒体的强度潜能，为组合厚壁筒的设计及工程应用提供一定的参考。

ELASTO-PLASTIC UNIFIED SOLUTIONS FOR COMBINED THICK WALL CYLINDER BASED ON UNIFIED STRENGTH THEORY

With consideration of the intermediate principal stress and different strength in tension and compression，the elasto-plastic bearing capacity of double and multilayer thick wall cylinder is analyzed based on unified strength theory. The separate radius, assemblage pressure and shrinkrange fundamental solutions are derived based on the yield condition for unified strength theory. The unified solutions for combined thick wall cylinder are also deduced. Parametric studies are carried out to evaluate the effects of unified strength theory parameter, tension-compression ratio, radius ratio and combined cylinder layer numbers on the unified solutions. The results are versatile in the theory of combined thick wall cylinder and pressure vessel. It makes full use of the strength potentialities for combined cylinder due to considering the intermediate principal stress. The solution has an important practical value for the optimum design and engineering application of combined thick wall cylinder.