Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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A Practical Finite Element Analysis Model for Hydrostatic Extrusion of a Biaxial Bar

이중봉 정수압 압출의 실용적 유한요소해석 모델

  • 윤상헌 (국민대학교, 대학원 기계설계학과) ;
  • 박훈재 (한국생산기술연구원, 성형기술연구팀) ;
  • 김응주 (한국생산기술연구원, 성형기술연구팀) ;
  • 이상목 (한국생산기술연구원, 성형기술연구팀) ;
  • 이종섭 (한국생산기술연구원, 성형기술연구팀) ;
  • 이근안 (한국생산기술연구원, 성형기술연구팀) ;
  • 김용배 (한국생산기술연구원, 성형기술연구팀) ;
  • 이용신
  • Received : 2013.02.20
  • Accepted : 2013.04.08
  • Published : 2013.06.01
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Abstract

A new finite element model for the hydrostatic extrusion of a biaxial bar is introduced. In this model, a penalty contact algorithm, which is adopted to replace the traction boundary conditions due to the fluid in the container of the extruder, is incorporated into a consistent penalty finite element formulation for the viscoplastic deformation of a work piece during hydrostatic extrusion. Two parameters, introduced in the penalty contact algorithm in this study, a critical penalty contact pressure $P_0$ and a critical penalty contact distance $D_c$, are carefully examined for various process conditions. The proposed finite element model is applied to the hydrostatic extrusion of a Cu-clad Al bar. The extrusion loads and thickness ratios of the clad materials by the proposed model are compared in detail to values from experiments reported in the literature. Finally, it is concluded that the proposed finite element model is useful in practical implementations.

Keywords

References

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