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采用ANSYS有限元软件,对压力容器筒体上不同中心距L的两相邻直径为d的开孔周边应力场进行分析,并定义参数K=L(/2d)。结果表明:无接管模型开孔周边最大应力大于有接管模型,故基于无接管模型的分析结果相对安全;当K<0.9时,随着两开孔间距的增大,开孔中心线上的最小应力显著减小;当K=0.9～1.5时,开孔中心线上的最小应力随开孔间距的增大缓慢减小;当K>1.5时,开孔中心线上的最小应力均接近筒体远离开孔部位的应力。综合分析应力集中系数及应力集中影响范围,可知当K>1.7时,两开孔不存在干涉作用,可视为相互独立开孔。
The finite element software ANSYS was used to analyze the stress field around the perforations of two adjacent diameters d with different center distances L in the pressure vessel and the parameter K = L (/ 2d) was defined. The results show that the maximum stress around the perforation of the unmanned model is larger than the takeover model, so the analysis results based on the unmanaged model are relatively safe. When K <0.9, with the increase of the distance between the two holes, the minimum on the centerline When K = 0.9-1.5, the minimum stress on the centerline of the hole decreases slowly with the increase of the hole spacing. When K> 1.5, the minimum stress on the centerline of the hole is close to the cylinder Strain away from the hole. Comprehensive analysis of stress concentration factors and stress concentration range, we can see that when K> 1.7, the two holes do not interfere, can be considered as independent of each other holes.