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

The Society of Naval Architects of Korea (대한조선학회)
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Fracture Estimation of Stiffened Plates under Impact Loading using Micromechanics Plasticity Model

미시역학 소성모델을 이용한 충격하중을 받는 보강판의 파단 예측

  • Choung, Joon-Mo (Dep' t of Naval Architecture and Ocean Engineering, Inha University) ;
  • Cho, Sang-Rai (School of Naval Architecture and Ocean Engineering, University of Ulsan) ;
  • Kim, Kyung-Su (Dep' t of Naval Architecture and Ocean Engineering, Inha University)
  • 정준모 (인하대학교 선박해양공학과) ;
  • 조상래 (울산대학교 조선해양공학부) ;
  • 김경수 (인하대학교 선박해양공학과)
  • Published : 2009.12.20
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Abstract

This paper first reviews the physical meanings and the expressions of two representative strain rate models: CSM (Cowper-Symonds Model) and JCM (Johnson-Cook Model). Since it is known that the CSM and the JCM are suitable for low-intermediate and intermediate-high rate ranges, many studies regarding marine accidents such as ship collision/grounding and explosion in FPSO have employed the CSM. A formula to predict the material constant of the CSM is introduced from literature survey. Numerical simulations with two different material constitutive equations, classical metal plasticity model based on von Mises yield function and micromechanical porous plasticity model based on Gurson yield function, have been carried out for the stiffened plates under impact loading. Simulation results coincide with experimental results better when using the porous plasticity model.

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References

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