• 제목/요약/키워드: Crashworthness

검색결과 3건 처리시간 0.015초

등가 드로오비드를 적용한 Front Side Member의 성형해석 및 충돌평가 (Forming Analysis of the Front Side Member using Equivalent Draw-bead for Crashworthness Assessment)

  • 송정한;김기풍;김승호;허훈;김현섭;홍석길
    • 소성∙가공
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    • 제12권4호
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    • pp.320-327
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    • 2003
  • This paper is concerned with forming analysis of Front Side Members and effects of the forming analysis on crash analysis of an auto-body. For efficient forming analysis, equivalent draw-bead restraining forces are calculated with ABAQUS/Standard and then used as the boundary condition in forming simulation. In order to demonstrate the validity of the forming analysis, the thickness variation in the numerical simulation result is compared quantitatively with the one in the real product. Forming histories obtained kom the forming analysis are utilized as the initial condition of the crash analysis for accurate assessment of the crashworthiness. Crashworthiness such as the load-carrying capacity, crash mode and the energy absorption is evaluated and investigated for the identification of forming effects.

Tension Split Hopkinson bar를 이용한 자동차 성형용 금속 박판의 Johnson-Cook 구성방정식 결정 (Johnson-Cook constitutive relation of sheet metals for an auto-body with a tension split Hopkinson bar apparatus)

  • 강우종;조상순;허훈;정동택
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 1997년도 추계학술대회논문집
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    • pp.84-88
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    • 1997
  • The Jonhnson-Cook constitutive relation has been used in dynamic plasticities. The constants of the Jonhson-Cook relation of sheet metals for an autobody is not known yet. In this paper, the material properties of SPCEN, SPCC and SPRC in the high strain rate states have been acquired. A new tension split Hopkinson bar was used in high speed tensile tests of sheet metals. The experimental results acquired from the apparatus are used to determine the constants of Johnson-Cook constitutive relation of sheet metals. This results can be used to analysis of crashworthness.

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새로운 Tension Split Hopkinson Bar를 이용한 박판의 고속 인장시험 (High strain rate tensile test of sheet metals with a new tension split hopkinson bar)

  • 강우종;조상순;허훈;정동택
    • 대한기계학회논문집A
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    • 제21권12호
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    • pp.2209-2219
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    • 1997
  • A split hopkinson bar could be used for obtaining the high strain rate material properties of sheet metals for an autobody. In high speed tensile tests of sheet matals, a new design of a tension split Hopkinson bar apparatus is needed. The design of grips and an anvil length are numerically analyzed with ABAQUS/Explicit for the new apparatus of split Hopkinson bars. From the experiments with the new apparatus, the material properties of SPCEN in the high strain rate state have been acquired and compared with quasi-static experimental results. The material properties of SPCEN as well as other sheet metals in an autobody are indispensible for the analysis of crashworthness. Nevertheless the experiment of sheet metal in the high strain rate state has not been done or reported.