인장하중이 작용하는 평판에 존재하는 반타원 표면균열의 J-적분 계산식

다국어 초록 (Multilingual Abstract)

This paper provides a simplified engineering J estimation method for semi-elliptical surface cracked plates in tension, based on the reference stress approach. Note that the essential element of the reference stress approach is the plastic limit load in the definition of the reference stress. However, for surface cracks, the definition of the limit load is ambiguous (local or global limit load), and thus the most relevant limit load (and thus reference stress) for the J estimation should be determined. In the present work, such limit load solution is found by comparing reference stress based J results with those from extensive 3-D finite element analyses. Validation of the proposed equation against FE J results based on actual experimental tensile data of a 304 stainless steel shows excellent agreements not only for the J values at the deepest point but also for those at an arbitrary point along the crack front, including at the surface point. Thus the present results provide a good engineering tool for elastic-plastic fracture analyses of surface cracked plates in tension.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 참조응력법에 입각한 J-적분 계산
• 3. 유한요소해석을 통한 검증
• 5. 결론
• 후기
• 참고문헌