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자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제42권 제6호
발행연도
2010.1
수록면
680 - 689 (10page)

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The crack-tip stress fields and fracture mechanics assessment parameters for a surface crack, such as the elastic stressintensity factor or the elastic-plastic J-integral, can be affected significantly by the adjacent cracks. Such a crack interactioneffect due to multiple cracks can alter the fracture mechanics assessment parameters significantly. There are many factors tobe considered, for instance the relative distance between adjacent cracks, the crack shape, and the loading condition, to quantifythe crack interaction effect on the fracture mechanics assessment parameters. Thus, the current assessment codes on crackinteraction effects (crack combination rules), including ASME Sec. XI, BS7910, British Energy R6 and API 579-1/ASME FFS-1,provide different rules for combining multiple surface cracks into a single surface crack. The present paper investigates crackinteraction effects by evaluating the elastic stress intensity factor and the elastic-plastic J-integral of adjacent in-plane surfacecracks in a plate through detailed 3-dimensional elastic and elastic-plastic finite element analyses. The effects on the fracturemechanics assessment parameters of the geometric parameters, the relative distance between two cracks, and the crack shapeare investigated systematically. As for the loading condition, an axial tension is considered. Based on the finite elementresults, the acceptability of the crack combination rules provided in the existing guidance was investigated, and the relevantrecommendations on a crack interaction for in-plane surface cracks are discussed. The present results can be used to developmore concrete guidance on crack interaction effects for crack shape characterization to evaluate the integrity of defectivecomponents.

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