压力容器大开孔结构的有限元分析

使用ANSYS9.0对某具有大开孔结构的压力容器进行了三维建模,采用SHELL181壳单元,使用智能网格划分方式划分网格.提出了“无补强”、“补强圈补强”和“整体补强”三种结构方案,分别进行有限元分析,得到了位移云图和应力云图.结果表明,“补强圈补强”使最大位移量下降12.6％,最大等效应力下降13.8％,“整体补强”使最大位移量下降31.5％,最大等效应力下降20.1％,两种补强方案均能满足强度要求.最后,从经济性考虑,优先选用“补强圈补强”方案.

FEA of Pressure Vessel with Large Opening

The three-dimensional model of a pressure vessel with large nozzle-to-cylinder diameter ratio structure is built in ANSYS9.0,using SHELL181 element and smart meshing method.The displacement and mises stress nephograms of three structure schemes：＂no reinforcement＂,＂ reinforcing ring reinforcement＂ and ＂overall reinforcement＂,are obtained by employing FEA.Resuits show that the Max displacement decrease by 12.6％,the Max mises stress decrease by 13.8％ in ＂reinforcement ring reinforcement＂,and the Max displacement decrease by 31.5％,the Max mises stress decrease by 20.1％ in ＂reinforcing the whole＂,compared with ＂no reinforcement＂ scheme.Finally,from economic considerations,＂reinforcing ring reinforcement＂ scheme is preferred.