压力容器球壳不连续区域应力分析和强度评定

Stress analysis and strength evaluation of discontinuous zone of pressure vessel spherical shells

球壳开孔接管区的应力较高且分布状况较复杂。借助ANSYS Workbench软件,通过建立球壳开孔接管模型,实现压力容器开孔接管区不连续应力的模拟分析,探讨了开孔率、厚度比以及不同受载情况对球壳开孔接管区最大应力的影响,并进行了正交试验和应力评定。结果表明:随着开孔率和内压载荷的增大,最大应力呈增大的趋势;随着厚度比的增大,最大应力呈减小的趋势;厚度比对球壳最大应力的影响程度最大,开孔率对球壳最大应力的影响程度最小;应力评定能满足强度要求,试验结果可为球壳的设计提供借鉴。

The stress in spherical shell opening nozzle area is high and its distribution is complex. With the help of ANSYS Workbench software, the simulation analysis of discontinuous stress in the opening tubing region of pressure vessel is realized by establishing the opening tubing model of spherical shell. The effects of opening ratio, thickness ratio and different loading conditions on the maximum stress in the opening tubing region of spherical shell are discussed. Orthogonal experiments and stress evaluation are carried out. The results show that the maximum stress increases with the increase of opening ratio and internal pressure load, decreases with the increase of thickness ratio, and the influence of thickness ratio on the maximum stress of spherical shell is the greatest, while the influence of opening ratio on the maximum stress of spherical shell is the smallest. The stress assessment can meet the strength requirements, and the experiments results can provide a reference for the design of spherical shells.