소성∙가공 (Transactions of Materials Processing)

  • 제21권3호
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  • Pages.151-159
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  • 2012
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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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결정립 성장을 고려한 초소성 성형공정의 유한요소해석(I)

Finite Element Analysis of Superplastic Forming Processes Considering Grain Growth (I)

  • 김용관 (충남대학교 기계설계공학과 대학원) ;
  • 송재선 (대구기계부품연구원 차세대금형기술혁신센터) ;
  • 김용환 (충남대학교 기계설계공학과)
  • 투고 : 2011.07.29
  • 심사 : 2012.02.03
  • 발행 : 2012.06.01
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초록

Finite element simulations were conducted to investigate the influence of grain growth in the superplastic blow forming process. A microstructure-based constitutive model considering grain growth effects is proposed and used in the simulations. Also, a grain growth rate equation accounting for both static and dynamic grain growth is implemented. The simulations were made using a 2D plane-strain model for constrained blow forming and an axisymmetric model for free bulging. These two models showed different features during the forming stages. However, the forming pressure-time curve and the thickness distribution obtained by both simulations explained well the deformation hardening induced by the grain growth during superplastic forming. This study shows that grain growth is an important factor in determining the material behavior during superplastic deformation.

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참고문헌

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