【摘要】 具有大开孔（ｄ ／ Ｄ≥０．５）的圆柱壳是压力容器及管道连接中最常用的结构之一。采用非线性有限元法对这种结构进行了弹塑性分析，确定了孔边的应力集中系数，初始屈服的载荷及位置，塑性区扩展的规律，结构的变形等。最后通过结构上最大塑性变形点的载荷应变曲线，确定了其极限载荷值。同时对采用小变形和大变形理论的分析结果作了比较，结果表明，对于求解极限载荷而言，采用小变形理论亦可获得较精确的结果。更多还原

【Abstract】 A three dimentional finite element analysis was carried out for large diameter ratio cylinder intersection under internal pressure to determine the limit load of the structure .The stress concentration factor and the spread of plastic area as well as the behavior of deformation are also obtained from this analysis . The results indicate that nonlinear FEA is an effective and economical method for determining limit load.更多还原