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International Journal of Automotive Technology > Volume 20(S); 2019 > Article
International Journal of Automotive Technology 2019;20(S): 3-8.
APPLICATION OF A GRAPHICAL METHOD ON ESTIMATING FORMING LIMIT CURVE OF AUTOMOTIVE SHEET METALS
Quoc Tuan Pham1, Jinjae Kim1, The Thanh Luyen2, Duc Toan Nguyen3, Young Suk Kim1
1Kyungpook National University
2Hungyen University of Technology and Education
3Hanoi University of Science and Technology
PDF Links Corresponding Author.  Young Suk Kim , Email. caekim@knu.ac.kr
ABSTRACT
In the automotive engineering community, the modified maximum force criterion proposed by Hora and coworkers is considered acceptable for theoretically estimating the forming limit curve (FLC) of sheet metals. Based on this criterion, a graphical method is proposed to simplify evaluation of the FLC. This paper investigates the proposed graphical method in a special case by using a power-hardening law and the Mises yield function, which leads to an explicit expression of the critical strains according the strain paths. The FLC of a DP590 sheet estimated using the proposed method is compared with that estimated using existing analytical methods. The proposed method provides the best prediction of the FLC of the tested material. For verification, the calculated FLC is then adopted into the finite-element method to predict the punch stroke at fracture of several notched specimens subjected to Nakazima tests. The good agreement between the predicted and experimentally determined values of the punch strokes verifies the ability and potential of the proposed method in industrial engineering.
Key Words: Forming limit curve, Modified maximum force criterion, DP590 sheet, Finite element method
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