Fatigue Indicator Sensor의 형상에 따른 균열진전 특성의 비교 연구
A Comparative Study on the Crack Propagation Characteristics According to the Pre-Notch Shapes of Fatigue Indicator Sensor
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초록
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 prenotch 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.
Abstract
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 prenotch 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.
참고문헌 (6)
- 김경수, "선체 용접부의 균열진전 및 피로수명 예측에 관한 연구(I)", 대한조선학회 논문집, 45(6), pp.669~678 (2008), 대한조선학회
- 김창욱, "균열전파해석에 의한 선체의 피로수명 평가법 -응력강도계수의 간이추정법-", 대한조선학회 논문집, 39(1), pp.10~99 (2002), 대한조선학회
- Fujimoto, Y, "Structural Monitoring for Fatigue Crack Detection and Prediction", The International Society of Offshore and Polar Engineers, 4, pp.227~235 (1996)
- Det Norske Veritas(DNV), "Fatigue Assessment of Ship Structures", pp.8~19 (2003), Classification Notes
- Lee, H.Y, "Multidirectional Fatigue Damage Indicator" (2000), United States Patent
- Smith, H.W, "Fatigue Damage Indicator, United States Patent, 3979949", ~ (1975)