摘要
建立了简化的管壳式换热器三维模型,利用ANSYS软件对模型的温度场和应力场进行了有限元分析,对比分析了1h和105 h后的应力场,分析了高温蠕变模拟结果。结果表明:由于蠕变变形引起的应力松弛使得105 h后的应力最大值较1h后的出现了明显的下降,最大值出现的位置也发生了变化;经过105 h后换热器的最大蠕变应变达到了0.337,严重蠕变发生的位置主要在封头顶端和筒体中部,与文献报道的失效部位一致,证明了模拟结果的准确性。
A simplified three-dimensional model of the shell and tube heat exchanger was established.The temperature field and stress field of this structure were calculated by finite element software ANSYS.The stress field after 1hour and 105 hours were compared,and the simulation result of high temperature creep was analyzed. Results demonstrate that the maximum equivalent stress descended obviously compared with that after 1hour and its location was changed due to stress relaxation caused by the creep deformation.The maximum creep strain of the heat exchanger at 105 hour reached 0.337;the serious creep deformation occurred at the top of shell cover and middle part of cylinder,consistent with failure position in the literature,which proved the accuracy of the simulation results.
出处
《机械工程材料》
CSCD
北大核心
2014年第4期87-90,95,共5页
Materials For Mechanical Engineering
基金
国家自然科学基金资助项目(51376163)
关键词
压力容器
蠕变
应变
有限元模拟
pressure vessel
creep
strain
finite element simulation
