压力容器碟形封头焊接结构应力数值计算及安全评定  

Numerical Simulation and Safety Assessment for Pressure Vessel Dished Closure Head Welded Structure

作　　者：代文广 周广涛[2] 余作恒 DAI Wenguang;ZHOU Guangtao;YU Zuoheng(Xiamen Hongfa Electric Appliance Co.,Ltd.,Xiamen 361021,China;College of Mechanical Engineering and Automation,Huaqiao University,Xiamen 361021,China;Zealway(Xiamen)Instrument Inc Graduate Workstation,Xiamen 361021,China)

机构地区：[1]厦门宏发电力电器有限公司,厦门361021 [2]华侨大学机电及自动化学院,厦门361021 [3]致微(厦门)仪器有限公司研究生工作站,厦门361021

出　　处：《机械工程材料》2023年第12期93-97,共5页Materials For Mechanical Engineering

基　　金：福建省自然科学基金资助项目(2021J01299)。

摘　　要：采用埋弧焊焊接制备SA-240M 304不锈钢碟形封头,建立简易有限元模型,采用刚体面偏置约束模拟碟形封头在工况条件下的应力场,并对危险区域的Mises等效应力进行计算和安全评定。结果表明:有限元模拟得到碟形封头长圆孔右侧圆弧中间区域的Mises等效应力最大,为危险区域,与由实测应变计算得到应力的相对误差仅为4.7%,验证模型准确;对危险区域沿应力分类线的法向应力进行等效线性化处理后得到一次薄膜应力、一次弯曲应力、峰值应力、二次弯曲应力分别为135.19,3.54,0.774,42.83 MPa,根据ASME VIII-2评定为安全。The SA-240M 304 stainless steel dished closure head was manufactured by submerged arc welding. A simple finite element model was established to simulate the Mises equivalent stress field of dished closure head under rigid bias constraint working condition. The results show that the Mises equivalent stress in the middle of the circular circle on the right side of the elongated hole of the dish closure head was the maximum, which was the dangerous area. The relative error between simulation value and the stress calculated from the measured strain was only 4.7%, which verified the accuracy of the model. After equivalent linearization of the normal stress along the stress classification line in the dangerous area, the primary film stress, primary bending stress, peak stress and secondary bending stress were obtained, which were 135.19, 3.54, 0.774, 42.83 MPa, respectively, and were rated as safe according to ASME VIII-2.

关 键 词：压力容器 碟形封头 应力线性化 薄膜应力 应力评定 

分 类 号：TH49[机械工程—机械制造及自动化]