Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Punching Fracture Simulations of Circular Unstiffened Steel Plates using Three-dimensional Fracture Surface

3차원 파단 변형률 평면을 이용한 비보강 원판의 펀칭 파단 시뮬레이션

  • Park, Sung-Ju (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Lee, Kangsu (Korea Research Institute of Ships and Ocean Engineering) ;
  • Choung, Joonmo (Department of Naval Architecture and Ocean Engineering, Inha University)
  • 박성주 (인하대학교 조선해양공학과) ;
  • 이강수 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 정준모 (인하대학교 조선해양공학과)
  • Received : 2016.10.21
  • Accepted : 2016.12.07
  • Published : 2016.12.31
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Abstract

Accidental events such as collisions, groundings, and hydrocarbon explosions in marine structures can cause catastrophic damage. Thus, it is extremely important to predict the extent of such damage, which determines the total amount of oil spills and the residual hull girder strength. Punching fracture tests were conducted by Choung (2009b), where various sizes of indenters and circular unstiffened steel plates with different thicknesses were used to quasi-statically realize damage extents. A three-dimensional fracture strain surface was developed based on a reference (Choung et al., 2015b), where the average stress triaxiality and average normalized Lode angle were used as the parameters governing the fracture of ductile steels. In this study, new numerical analyses were performed using very fine axisymmetric elements in combination with an Abaqus user-subroutine to implement the three-dimensional fracture strain surface. Conventional numerical analyses were also conducted for the tests to identify the best fit fracture strain values by changing the fracture strains. Based on the phenomenon of the average normalized Lode angle starting out positive and then becoming slightly negative, it was inferred that the shear stress primarily dominates in determining the fractures locations, with a partial contribution from the compressive stress. It should be stated that the three-dimensional fracture surface effectively predicted at least the shear stress-dominant fracture behavior of a mild steel.

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