균열진전에 대한 쇼트피닝 효과

• Published in: Han-guk haeyang gonghak hoeji (Online) Vol. 18; no. 6; pp. 91 - 95
• Main Authors: 심동석(DONG-SUK SHIM), 이승호(SEUNG-Ho LEE), 이명호(MYUNG-Ho LEE)
• Format: Journal Article
• Language: Korean
• Published: 한국해양공학회 2004
• Subjects: 해양공학; Two-Step Shot-peening 2단쇼트피닝; Fracture Toughness 파괴인성; Fatigue Crack Growth 피로균열진전; Initial Stress Intensity Factor Range 초기응력확대계수범위; Compressive Residual Stress 압축잔류응력; 2
• ISSN: 1225-0767; 2287-6715

In this study, to investigate the effects of shot peening on crack growth behavior, crack growth tests are conducted on spring steels and shot peened cracks. The probabilistic crack growth equation, which can represemt the sigmoidal crack growth behavior as recently reported by Kim and Shim, is used to evaluate the experimental results. The results show that fatigue cracks grows slower in the shot peened specimen than in the unpeened and, due to the compressive residual stress occurring on the specimen surface. In the case of the shot peened specimen, the initial stress intensity factor range and the fracture toughness is higher than the non-peened specimen because the compressive residual stress affects crack growth and fracture of the specimen.