변형률 속도 경화 효과를 고려한 자동차 부재의 유한요소 충돌해석 Crashworthiness of an Auto-body Structure Considering the Strain Rate Hardening Effect

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A split Hopkinson bar could be used for obtaining high strain rate material properties of sheet metals for an autobody. In high speed tensile test of sheet metals, a new tension split Hopkinson bar is needed. From the experiments with the new apparatus, the material properties of SPCEN, SPCC, SPRC in the high strain rate have been acquired. The experimental results are used to obtain the constitutive relation of sheet metals. The results show that the strain rate hardening effect for sheet metals can not be described by the original Johnson-Cook constitutive relation. This relation has been modified to include a higher-order term for the hardening effect. The constitutive relations obtained are used to simulate a s-shaped beam to know the energy absorption and impact force. The strain rate effect is an important factor in crashworthiness.
Publisher
대한기계학회
Issue Date
1999
Keywords

Hopkinson bar; Finite Element Method; Strain rate hardening; Constitutive relation; Crashworthiness

Citation

대한기계학회 춘계학술대회 논문집, pp.865~870

URI
http://hdl.handle.net/10203/15229
Link
http://www.ksme.or.kr/
Appears in Collection
ME-Conference Papers(학술회의논문)

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