内压厚壁容器外壁表面凹坑应力场有限元分析

采用通用有限元程序ＡＮＳＹＳ对内压厚壁容器筒体外壁表面凹坑（含打磨外壁表面裂纹缺陷所形成的纵向凹坑及环向凹坑）以及与筒体等厚的半球形封头表面凹坑的应力场进行了分析，研究了两种不同弹塑性材料模型（理想弹塑性模型和线性强化弹塑性模型）在纵向表面凹坑中的弹塑性应力场，并且分析了凹坑形状参数比对应力集中的影响，分析采用参数化模型，适用于各种尺寸内厚壁容器外壁面各种尺寸凹坑的应力场分析。

Finite element analysis for pits on outer surface of thickwall vessel subjected to internal pressure

In this paper, pits on outer surface of thickwall vessel subjected to internal pressure are analyzed using the general finite element code ANSYS. A parametrization modal is developed so that the modal can be adapted to different size vessels and pits, and can be used to analyze the effects of many parameters such as geometrical and properties parameters. Three kinds of pits are analyzed, which are longitudinal and tangential pits on the cylindrical wall and pits on the semispherical head. These pits are mainly caused by the crackremovingmilling process. The effects of the pit geometry on the stress concentration are analyzed, and the influences of two kinds of materials, elasticperfectly plastic material and elasticlinearly strainhardening material are also examined. The conclusions of this study are useful as reference for engineering practice.