含腐蚀缺陷管道剩余强度的有限元法分析

采用有限元数值计算方法分析了腐蚀坑交互作用对管道剩余强度的影响，结果表明，对于轴向排列的两上蚀坑，其交互作用随蚀坑间距增大而减小，当蚀坑间距小于最小蚀坑轴向长度的两倍时，管道腐蚀剩余强度评价时应考虑交互作用的影响，当蚀坑间距大于最小蚀坑轴向长度的两倍时，管道腐蚀剩余强度评价时只需考虑最严重的腐蚀坑，对于环向排列的两个蚀坑，当仅有内压载荷时，不发生交互作用，只需依据最严重的腐蚀坑计算管道腐蚀剩余强度。

FEM Analysis on the Effect of Corroded Flaw Interaction on Remaining Storage of Line Pipe.

This paper analyzed the effect of corroded flaw interaction on remaining strength of line pipe with the finite element (FEM ) analysis method. The results indicated that interaction of two corroded flaws aligned longitudinally inclines with increasing of space between them. If the space between the two corroded flaws exceeded longitudinal length of the flaw with smaller size by two times ,their interaction would not exist almost,and only the more severe flaw among them would be considered to assess the remaining strengh of line pipe. With line pipe only loaded inner pressure ,interaction of two corroded flaws aligned circumferenti-ally could be negligible.