대한조선학회논문집 (Journal of the Society of Naval Architects of Korea)

  • 제47권4호
  • /
  • Pages.565-572
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  • 2010
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  • 1225-1143(pISSN)
  • /
  • 2287-7355(eISSN)
대한조선학회 (The Society of Naval Architects of Korea)
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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

  • 김재현 (인하대학교 조선해양공학과) ;
  • 김슬기 (인하대학교 조선해양공학과) ;
  • 조영근 (인하대학교 조선해양공학과) ;
  • 여승훈 (인하대학교 조선해양공학과) ;
  • 김경수 (인하대학교 조선해양공학과) ;
  • 김성찬 (인하공업전문대학 선박해양시스템과) ;
  • 이장현 (인하대학교 조선해양공학과)
  • Kim, Jae-Hyun (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Kim, Seul-Ki (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Cho, Young-Gun (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Yeo, Seung-Hoon (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Kim, Kyung-Su (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Kim, Sung-Chan (Department of Ship and Ocean System, Inha Technical College) ;
  • Lee, Jang-Hyun (Department of Naval Architecture and Ocean Engineering, Inha University)
  • 투고 : 2009.12.18
  • 심사 : 2010.05.19
  • 발행 : 2010.08.20
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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 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.

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참고문헌

  1. Kim, K.S., Hisashi Ito, Seo, Y.S., Jang, B.S., Kim, B.I., and Kwon, Y.B., 2008, “A Study of Crack Propagation and Fatigue Life Prediction on Welded Joints of Ship Structure(I),” Journal of the Society of Naval Architects of Korea, Vol. 45, pp.669-678. https://doi.org/10.3744/SNAK.2008.45.6.669
  2. Kim, C.W., Kim, D.S., and Nho, I.S., 2002, “Fatigue Life Assessment of Ship Structures based on Crack Propagation Analysis – Simplified Prediction Method of Stress Intensity Factors-,” Journal of the Society of Naval Architects of Korea, Vol. 39, No.1, pp. 90-99. https://doi.org/10.3744/SNAK.2002.39.1.090
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  4. Det Norske Veritas(DNV), 2003, Fatigue Assessment of Ship Structures, Classification Notes, 30.7, pp. 8-19 & 92-104.
  5. Lee, H.Y., Kim, J.B., 2000, Multidirectional Fatigue Damage Indicator, United States Patent, US 6443018 B1.
  6. Smith, H.W., 1975, Fatigue Damage Indicator, United States Patent, 3979949.