차체용 고장력 강판의 고속 인장 특성 연구Evaluation of Dynamic Tensile Characteristics of the High Strength Steel Sheet for an Auto-Body

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An important challenging issue in the automotive industry is the light-weight, safe design and enhancement of crash response of an auto-body structures. These objectives lead to increasing adoption of high strength steel sheet for inner and outer auto-body members. This study evaluates the dynamic tensile characteristics of high strength steel sheets, HS45R, TRIP60, DP60 and DP100, along the rolling direction and transverse direction. Static tensile tests were carried out at the strain rate of 0.003/sec using the static tensile machine (Instron 5583). Dynamic tensile tests were carried out at the range of strain rate from 0.1/sec to 200/sec using a high speed material testing machine developed. The tensile tests acquire stress-strain relation and strain rate sensitivity of each material. The experimental results show two important aspects for high strength steels: the flow stress is increased as strain rate increases; the strain hardening is decreased as the tensile stress increases. The experiments also produce interesting results that the elongation is not decreased even when the strain rate increases.
Publisher
대한기계학회
Issue Date
2005
Keywords

High strength steel; High speed material testing machine; Strain rate; Dynamic tensile test

Citation

대한기계학회 추계학술대회, pp.1654-1659

URI
http://hdl.handle.net/10203/15471
Link
http://www.ksme.or.kr/
Appears in Collection
ME-Conference Papers(학술회의논문)

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