Fatigue Indicator Sensor의 형상에 따른 균열진전 특성의 비교 연구

• Published in: 大韓造船學會 論文集 Vol. 47; no. 4; pp. 565 - 572
• Main Authors: 김재현(Jae Hyun Kim), 김슬기(Seul Ki Kim), 조영근(Young Gun Cho), 여승훈(Seung Hoon Yeo), 김경수(Kyung Su Kim), 김성찬(Sung Chan Kim), 이장현(Jang Hyun Lee)
• Format: Journal Article
• Language: Korean
• Published: 대한조선학회 2010
• Subjects: 조선공학; Fatigue life(피로수명); Stress concentration factor(응력집중계수); Stress intensity factor(응력확대계수); 균열예지센서; Fatigue indicator sensor(FIS; Characteristics of crack propagation(균열진전특성)
• ISSN: 1225-1143; 2287-7355

It is difficult to predict the accurate fatigue life of the ship structure because of load uncertainty and load redistribution at the ship structure members. As one of studies for accurate evaluation and prediction of fatigue life, it is a promising way to detect the crack previously by attaching the Fatigue Indicator Sensor (FIS) at the crack prediction region. In order to predict the fatigue life of the ship structure by using FIS, it is required to know previously the crack propagation characteristics according to pre-notch shapes. In this study, we obtained the stress distribution phase, stress concentration factors and stress intensity factor of various pre-notch shapes through FEA. Additionally, we conducted the fatigue test and obtained the characteristics of crack propagation according to the pre-notch shapes through comparison between the fatigue test and the FEA. Consequently, we classified the pre-notch shape into 3 categories: Long, Medium, and Short life type. On the basis of the numerical and experimental results, the FIS can be developed.