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Forming Limit Diagram of DP590 considering the Strain Rate  

Kim, Seok-Bong (School of Mechanical, Aerospace and Systems Engineering, KAIST)
Ahn, Kwang-Hyun (School of Mechanical, Aerospace and Systems Engineering, KAIST)
Ha, Ji-Woong (School of Mechanical, Aerospace and Systems Engineering, KAIST)
Lee, Chang-Soo (School of Mechanical, Aerospace and Systems Engineering, KAIST)
Huh, Hoon (School of Mechanical, Aerospace and Systems Engineering, KAIST)
Bok, Hyun-Ho (Technical Research Center, Hyundai Hysco)
Moon, Man-Been (Technical Research Center, Hyundai Hysco)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.18, no.1, 2010 , pp. 127-130 More about this Journal
Abstract
This paper deals with the formability of DP590 steel considering the strain rate. The strain hardening coefficient, elongation and r-value were obtained from the static and dynamic tensile test. As strain rate increases from static to 100/s, the strain hardening coefficient and the uniform elongation decrease and the elongation at fracture and r-value decrease to 0.1/s and increase again to 100/s. The high speed forming limit tests with hemi-spherical punch were carried out using the high speed crash testing machine and high speed forming jig. The high speed forming limit of DP590(order of $10^2$/s) decreases compared to the static forming limit(order of $10^{-3}$/s) and the forming limit band in high speed forming test is narrower than that in the static forming test. This tendency may be due to the development of brittleness with increase of stain rate.
Keywords
Forming limit diagram; Sheet metal forming process; Strain rate; r-value; Dual phase steels;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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