缩减弹性模量有限元法计算加肋轴对称组合壳的极限载荷

Limit analysis of ring-stiffened axisymmetric combination shell by finite element method based on elastic modulus reduction

将缩减弹性模量的思想融入基于轴对称壳单元的有限元分析,建立缩减弹性模量有限元法,计算加肋轴对称组合壳的极限载荷。建立壳单元"弹性状态"、"局部屈服状态"和"截面屈服状态"的判断条件;提出弹性模量调整策略和组合壳极限状态的判断方法,实现对加肋轴对称组合壳的塑性极限分析。编制了计算程序,算例表明该方法计算时间省,计算精度较高。

A finite element method based on elastic modulus reduction is proposed to compute the limit load of ring-stiffened axisymmetric combination shell.The criteria for ＇elastic state＇,＇local yield state＇ and ＇section yield state＇ of shell element are established.The method of elastic modulus reduction and the criterion for plastic limit state of ring-stiffened axisymmetric combination shell are presented.The computer program is developed.Numerical example shows that the proposed method is effective and the computed result is accurate.