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

The Society of Naval Architects of Korea (대한조선학회)
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Estimation of Icebreaking Forces and Failure Length of Ice Rubbles on Infinite Ice Sheet

무한 빙판에서의 쇄빙력과 파단 빙편의 크기 예측

  • Choi, Kyung-Sik (Div. of Ocean Development Engineering, Korea Maritime University) ;
  • Lee, Jin-Kyoung (Div. of Ocean Development Engineering, Korea Maritime University) ;
  • Kim, Hyun-Soo (Shipbuilding & Plant R&D Institute, Samsung Heavy Industries) ;
  • Chun, Ho-Hwan (Dept. of Naval Architecture and Ocean Engineering, Pusan National University)
  • 최경식 (한국해양대학교 해양개발공학부) ;
  • 이진경 (한국해양대학교 해양개발공학부) ;
  • 김현수 (삼성중공업 조선플랜트연구소) ;
  • 전호환 (부산대학교 조선해양공학과)
  • Published : 2004.12.01
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Abstract

Ice rubble pieces broken by the bow impact load and side hull of an icebreaking vessel usually pass along the ship's bottom hull and may hit the propeller/rudder or other stern structures causing serious damage to ship's hull . Therefore it is important to estimate the size of broken ice pieces during the icebreaking process. The dynamic interaction process of icebreaker with infinite ice sheet is simplified as a wedge type beam of finite length supported by elastic foundation. The wedge type ice beam is leaded with vertical impact forces due to the inclined bow stem of icebreaking vessels. The numerical model provides locations of maximum dynamic bending moment where extreme tensile stress arises and also possible fracture occurs. The model can predict a failure length of broken ice sheet given design parameters. The results are compared to Nevel(1961)'s analytical solution for static load and observed pattern of ice sheet failure onboard an icebreaker. Also by comparing computed failure length with the characteristic length, the meaning of ice rubble sizes is discussed.

Keywords

References

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