破壊評価線図に基づくJ積分解析手法と炭素鋼配管の過大繰返し荷重によるき裂進展評価への適用

概要

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R 6 method proposed by U. K. CEGB (Central Electricity Generating Board, present Nuclear Electric plc) was applied to fracture evaluation using a failure assessment diagram (FAD). Since FAD has been developed based on J-integral criterion, J-integral can be inversely estimated using FAD. Because the fatigue crack growth rate is determined by J-integral value, it is suggested that R 6 method can be applied not only to fracture assessment but also to low-cycle fatigue crack growth assessment. Carbon steel pipes with a defect were monotonically and cyclically fractured to confirm the applicability of the crack growth assessment method using FAD. In the monotonic bending tests, J-resistant curve obtained by R6 method agreed with that obtained by η-Factor approach. In the cyclic bending tests, fatigue lives could be successfully estimated by the analysis using R 6 method.
1995-11-25