소성∙가공 (Transactions of Materials Processing)

  • 제18권8호
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  • Pages.596-600
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  • 2009
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  • 1225-696X(pISSN)
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  • 2287-6359(eISSN)
한국소성∙가공학회 (The Korean Society for Technology of Plasticity and materials processing)
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결함 성장을 고려한 수치해석적 성형한계도 예측

A Numerical Prediction of the Forming Limit Diagram Considering Damage Evolution

  • 김경태 (한국생산기술연구원 융합생산기술연구부) ;
  • 송정한 (한국생산기술연구원 융합생산기술연구부) ;
  • 이근안 (한국생산기술연구원 융합생산기술연구부) ;
  • 이형욱 (충주대학교 에너지시스템공학과) ;
  • 김세호 (대구대학교 자동차.산업.기계공학부) ;
  • 이용신 (국민대학교 기계자동차공학부)
  • 발행 : 2009.12.01
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초록

Finite element simulation is an alternative method to practically find the forming limit diagram(FLD). In this paper, the novel fracture criterion is utilized to predict the FLD in conjunction with finite element analysis for sheet forming. The principal scheme of the fracture criterion in this paper is that growth of the micro voids leads up to fracture in the viewpoint of micro-mechanics. The numerical FLD is verified by results of the out-of plane stretching test using hemispherical punch. The verification is also conducted about two types of material. These results are in good accord with the experimental results. Especially, the proposed scheme is appropriate to predict FLDs for a restricted material with low ductility after the instability point or ultimate tensile strength.

키워드

참고문헌

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피인용 문헌

  1. Finite-element analysis of radial extrusion for a thin disk with severe-plastic deformation vol.18, pp.3, 2012, https://doi.org/10.1007/s12540-012-3009-z