감육배관의 파괴양식에 따른 AE 특성

다국어 초록 (Multilingual Abstract)

Fracture behaviors of pipes with local wall thinning are very important for the integrity of nuclear power plant. However, effects of local wall thinning on strength and fracture behaviors of piping system were not well studied. Acoustic emission(AE) has been widely used in various fields, because of its extreme sensitivity, dynamic detection ability and location of growing defects. In this study, we investigated failure modes of local wall thinning pipes and AE signals by bending test. As results of test, we could divide four types of failure modes of ovalization, ovalization+cracking, local buckling and buckling+cracking. And fracture behaviors of Elastic range, yield range, plastic range and cracking progress could be evaluated in bending test by AE counts, accumulation counts and time frequency analysis. It is expected to be basic data that can protect a risk according to local wall thinning of pipes, as a real time test of AE.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 재료 및 실험 방법
• 3. 결과 및 고찰
• 4. 결론
• 참고문헌