含半球形腐蚀缺陷钢管剩余强度的有限元分析

Finite Element Analysis of Residual Strength of Pipe with Hemispheric Corrosion Defect

通过有限元方法分析了含单个不同深度半球形腐蚀缺陷钢管,在不同服役条件(压力状态)下的应力和应变状态,即缺陷深度和半径分别为1/8,1/4和1/2钢管公称壁厚时,得出不同状态下von Mises等效应力和von Mises等效应变分布情况。同时计算了含不同深度半球形缺陷管道的剩余强度,并给出剩余强度随缺陷深度的经验公式,结果显示含半球形缺陷管道剩余强度随缺陷深度的增加而线性降低。

The situation of stress and strain was analyzed by Finite Element Analysis（FEA） for the corroded line pipe by deferent inner pressures and with single hemispheric corrosion defects,of which the radius and depth were set as t/8,t/4 and t/2（t,the pipe wall thickness） respectively.Meanwhile,the residual strength of the pipes with corresponding defects were calculated respectively,as well as the empirical equation that relates to the residual strength and depth-thickness ratio d/t,was established,which shown that the residual strength decreased linearly with the increasing d/t.