소성∙가공 (Transactions of Materials Processing)

  • 제8권1호
  • /
  • Pages.47-56
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  • 1999
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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)
권호 표지

강소성 유한요소법에서 비압축성조건의 비교 연구

A Comparative Study of the Incompressibility Constraint on the Rigid Plastic Finite Element Method

  • 이상재 (한국중공업(주) 터빈설계실) ;
  • 조종래 (한국해양대학교 기계공학부) ;
  • 배원병 (부산대학교 기계공학부, 정밀금형 및 금형가공 연구센터)
  • 발행 : 1999.02.01
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초록

The governing functional in plastic deformation has to satisfy the incompressibility constraint. This incompressibility constraint imposed on velocity fields can be removed by introducing either Lagrange multiplier or the penalty constant into the functional. In this study, two-dimensional rigid plastic FEM programs using these schemes were developed. These two programs and DEFORM were applied in a cylinder upsetting and a closed die forging to compare the values of load, local mean stress and volume loss. As the results, the program using Lagrange multiplier obtained a more exact and stable solution, but it took more computational time than the program using the penalty constant. Therefore, according to user's need, one of these two programs can be chosen to simulate a metal forming processes.

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참고문헌

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