在对弯管进行弹塑性有限元分析时,经常使用弯管单元,但该单元存在两点不足,首先没有考虑由于热载荷或内压所产生的均匀膨胀以及由于一般的载荷条件所产生的不对称变形;其次没有考虑内压的可恢复影响因素。为此对该弯管单元进行了改进,改进后的弯管单元可克服上述缺陷。 In the elasto-plastic finite element analysis of elbows, the elbow unit is often used, but the unit has two disadvantages: firstly, it does not take into account the uniform expansion due to thermal or internal pressure and the failure due to normal load conditions Symmetric deformation; followed by no consideration of recoverable internal pressure factors. To this end, the elbow unit has been improved, and the improved elbow unit can overcome the above defects.