压力容器与切向接管结构应力三维有限元分析及强度评定

Stress Analysis for Tangential Bonded Structure of Pressure Vessel and Pipe Based on Finite Element Method

采用三维有限元方法对压力容器与接管切向连接部位进行了应力分析,获得了该部位的应力分布信息,并与正交接管连接结构形式的应力分布进行了比较.计算结果表明,采用压力容器的切向接管连接结构,使连接区域及其附近区域的应力分布复杂化,并产生明显的应力集中,其应力集中系数随接管与筒体连接处距离的增大而快速降低;各类应力的最大值发生在接管与筒体连接处且位于接管上部位的内侧区域,是筒体失效的危险区域;与压力容器正交接管开孔连接结构形式相比,采用压力容器切向接管连接结构,其连接部位的应力分布更趋复杂化,有更明显的应力集中现象.另外,本文还详述了采用JB4732-1995应力分析设计标准对压力容器与接管切向连接结构进行强度评定的方法.

The three- dimensional finite element method is applied to analyse stress for tangential bonded structure of pressure vessel and pipe, and the stress with orthogonal bonded structure of pressure vessel and pipe is compared. The calculation results show that it is the dangerous area of failure of cylindrical shell becaase it makes the stress distribution that joins district complex , and produces obvious stress concentration. The greatest stress occurs in the inside of pipe with the connection of cylindrical shell, and with the distance increasing, stress is reduced. And the also elaborates the strength assessment for this structure according to J134732 - 1995.