第 1 部 (32) 欠陥を有する原子力用配管の健全性評価手法の開発

概要

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The structural integrity of piping in aged power plant is increasingly compromised due to stress corrosion cracking, erosion corrosion and fatigue. The initiation and propagation of these defects require in depth study and some evaluation methods are proposed in this study. To obtain the fatigue crack growth behavior for the surface crack under the residual stress field, fatigue crack growth tests using a welded specimen with a surface crack were conducted and the results were compared with calculation based on the influence function method. Furthermore, four-point bending pipe fracture tests were conducted using full-scale pipe specimens with a through-wall crack or a wall thinning area. The results of these tests were used to propose a low cycle fatigue crack growth evaluation method whereby a simplified ΔJ calculation and a failure mode diagram for evaluation of allowable wall thinning size.
一般社団法人日本機械学会の論文
2003-03-27