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자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제36권 제4호
발행연도
2004.1
수록면
316 - 326 (11page)

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The 40% of wall criterion, which is generally used for the plugging of steam generator tubes,is applied only to a single crack. In a previous study, a total number of 9 failure models wereproposed to estimate the local failure of the ligament between cracks, and the optimumcoalescence model of multiple collinear cracks was determined among these models. It is,however known that parallel axial cracks are more frequently detected than collinear axialcracks during an in-service inspection. The objective of this study is to determine the plasticcollapse model that can be applied to steam generator tubes containing two parallel axialthrough-wall cracks. Three previously proposed local failure models were selected as thecandidates. Subsequently, the interaction effects between two adjacent cracks were evaluated toscreen them. Plastic collapse tests for the plate with two parallel through-wall cracks and finiteelement analyses were performed to determine the optimum plastic collapse model. Bycomparing the test results with the prediction results obtained from the candidate models, aCOD base model was selected as an optimum model.

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