Proceedings of the Korean Society for Technology of Plasticity Conference (한국소성가공학회:학술대회논문집)
- 1997.10a
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- Pages.84-88
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- 1997
Johnson-Cook constitutive relation of sheet metals for an auto-body with a tension split Hopkinson bar apparatus
Tension Split Hopkinson bar를 이용한 자동차 성형용 금속 박판의 Johnson-Cook 구성방정식 결정
- Kang, Woo-Jong (Department of Mechanical Engineering, KAIST) ;
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Cho, Sang-Soon
(Department of Mechanical Engineering, KAIST)
;
- Huh, Hoon (Department of Mechanical Engineering, KAIST) ;
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Jung, Dong-Taek
(Korea Institute of Technology and Education)
- Published : 1997.10.01
Abstract
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.