Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Prediction of fracture in Hub-hole Expansion Process Using Ductile fracture Criteria

연성파괴기준을 이용한 허브홀 확장과정에서의 파단 예측

  • 고윤기 (한국과학기술원 기계공학과) ;
  • 이종섭 (한국과학기술원 기계공학과) ;
  • 허훈 (한국과학기술원 기계공학과) ;
  • 김홍기 (POSCO 기술연구소) ;
  • 박성호 (POSCO 기술연구소)
  • Published : 2005.10.01
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Abstract

A hole expansion process is an important process in producing a hub-hole in a wheel disc of a vehicle. In this process, the main parameter is the formability of a material that is expressed as the hole expansion ratio. In the process, a crack is occurred in the upper edge of a hole as the hole is expanded. Since prediction of the forming limit by hole expansion experiment needs tremendous time and effort, an appropriate fracture criterion has to be developed for finite element analysis to define forming limit of the material. In this paper, the hole expansion process of a hub-hole is studied by finite element analysis with ABAQUS/standard considering several ductile fracture criteria. The fracture mode and hole expansion ratio are compared with respect to the various fracture criteria. These criteria do not predict its fracture mode or hole expansion ratio adequately and show deviation from experimental results of hole expansion. A modified ductile fracture criterion is newly proposed to consider the deformation characteristics of a material accurately in a hole expansion process. A fracture propagation analysis at the hub-hole edge is also performed for high accuracy of prediction using the new fracture criterion proposed.

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References

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