内压厚壁圆筒体最大允许内外壁温差的研究(下)

通过应力分类和评定 ,研究了稳定温度场中承受内压与径向温度梯度的厚壁圆筒体的最大允许内外壁温差。研究表明 ,在GB15 0规定的设计压力下 ,对于大多数在高温下工作有保温层的厚壁圆筒能够满足强度要求 ,当超过相应的最大允许内外壁温差时 ,需要对内压引起的应力和温差引起热应力的组合应力进行强度校核计算。同时 ,针对应力分类评定存在的缺陷进行了讨论

Study of the maximum allowable temperature difference for thick wall cylindrical shell under inner pressure(Part Ⅱ)

Based on stress classifying and assessing, the maximum allowable temperature difference between inner and outer surface of thick wall cylindrical shell, which is in stable temperature field and suffers inner pressure and radical temperature difference, is studied. The study shows that thick wall cylindrical shell with heat insulation layer can satisfy strength reqirement under high temperature working condition, and the combined stress caused by inner pressure and temperature difference must be computed when the temperature difference is beyond maximum allowable value. The shortcoming of stress classification is discussed.