J 적분법을 이용한 Ni-Cr-Mo-V 강의 파괴인성 평가 = An Evaluation of the Fracture Toughness of the Ni-Cr-Mo-V Steel by J Intergal

다국어 초록 (Multilingual Abstract)

Elastic-plastic fracture toughness(J_(IC)) of Ni-Cr-Mo-V steel with different yield strengths has been evaluated by two different testing methods (ASTM E8l3 JSME S001) and compared with K_(IC) and Charpy V-notch (CVN) impart value. At high yield strength levels, J_(IC) values measured by ASTM and JSME method are almost equal, however, at low yield strength levels, J_(IC) values by the ASTM method exceed those by the JSME method. This difference in J_(IC) values is due to variation in the method of considering crack extension on the specimen fracture surface. The comparison of K_(IC) with J_(IC) and CVN impact values shows that a very good correlation, exists between 93- 144 ㎏/㎟ yield strength levels. Therefore, it is possible to predict K_IC value with J_(IC) and CVN impact test.

목차 (Table of Contents)

• 1. 서론
• 2. 실험방법
• 시험편 제작
• 3. 실험결과 및 고찰
• 스트레치 존법에 의한 JIC의 평가
• R곡선법에 의한 JIC의 평가
• 4. 결론