중변형률 속도에서의 강판의 파단 연신율 연구 Study on the Fracture Elongation of the Steel Sheet at the Intermediate Strain Rate

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While the formability is important and indispensable for success in very complicated sheet metal forming, it seems that few studies has been carried out about the formability of sheet metal at the high strain rate. The present experimental results report that the elongation is dependent on the crosshead speed in tensile tests. In this paper, the tensile elongation has been obtained from various steel sheets for an auto-body at the intermediate strain rate. The strain rate in the experiment is ranged from 0.003/sec to 200/sec. The experimental result demonstrates that the tensile elongation does not decrease as the strain rate increases. This tendency has varieties depending on the microstructure and forming history of sheet metal. Some high strength steels have the tendency that the tensile elongation increases as the strain rate increases, while others not. This phenomenon is very important not only in sheet metal forming but also in the crash worthiness evaluation to predict the fracture and tearing of sheet metal members.
Publisher
한국자동차공학회
Issue Date
2004-10-14
Language
KOR
Citation

한국자동차공학회 2004년 추계학술대회, v.3, pp.1669 - 1674

URI
http://hdl.handle.net/10203/175233
Appears in Collection
ME-Conference Papers(학술회의논문)

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