4051 影響関数法による配管内側全周き裂の評価(G03-8 解析・計算技術,G03 材料力学)

概要

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It might be possible that many coplanar SCC cracks initiate and propagate along the welding line of a pipe. In order to evaluate the safety of this type of cracked pipe, an internal fully circumferential crack is often assumed. Since stress relief results from displacement-controlled conditions, the K-value is different depending upon the length of piping. Therefore, K-values have to be evaluated for each case, one by one, which means enormous amount of FEM analyses are necessary. But the author has found that the principle of superposition can be applied to this problem. The authors have developed "SCAN circumferential crack version" which is effective to estimate the residual life of SCC crack propagation, for internal fully circumferentially cracked pipes.
社団法人日本機械学会の論文
2006-09-15