柱壳切向开孔接管结构弹塑性有限元分析 摘要:概述了国内外有关压力容器切向开孔接管结构的研究现状,以及有限元法的基本理论和ANSYS在应力分析计算中的应用。采用ANSYS软件,设计了开孔率不同、壁厚比不同的切向开孔接管模型。并在不同内压等级作用下,对切向开孔接管结构连接处的环向和经向应力的分布状况展开了对比研究,分别得到不同尺寸参数下的接管连接处的环向与经向应力集中系数分布规律,并把正交接管和切向接管的应力分布及应力大小做了对比。最后,对切向接管圆柱内压容器的弹性应力分布、应力集中系数等问题做了初步探讨。计算结果表明切向接管内压圆柱容器在接管与容器的连接处存在明显的应力集中,最大应力是在筒体与接管相切处接管内壁上,且最大应力集中系数小于经验公式算出的应力集中系数。 关键词:切向接管压力容器应力集中系数有限元法 The elastic-plastic analysis of cylindrical vessel with tangential nozzle by finite element method Abstract:Firstly, this paper presents the review of the study status of tangential openings of pressure vessel in both the domestic and abroad. It also gives the summary of the applications of the basic principles of finite element method and ANSYS on the study of the stress analysis. Using the finite element program ANSYS, some tangential opening nozzle structure models with different opening ratio and with different thickness ratio were designed. Based on these models, the contrast study of circumferential and longitudinal stresses at the connection zone of tangential opening nozzle under different inner pressure levels was performed. The distribution rule of the stress concentration factors at the junction between the nozzles and the cylinders under the influences of various size parameters was obtained, and the differences in stress distribution and stress intensity between tangential nozzle and intersection nozzle were also obtained. In conclusion, the elastic stress distribution and stress concentration factor were discussed. The results show that the stress concentration occurs obviously on the hillside intersection. The maximum stress of hillside intersection occurs in the tangent section. It is found that the maximum stress concentration factor is largely less than the stress concentration factor given by empirical equation. Key words:Tangential nozzle Pressure vessel Stress concentration factor Finite element method 目录 1 前言············································································
