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Small-Scale System for Evaluation of Stretch-Flangeability with Excellent Reliability

Title
Small-Scale System for Evaluation of Stretch-Flangeability with Excellent Reliability
Authors
Jae Ik YoonJaimyun JungHak Hyeon LeeHyoung Seop Kim
POSTECH Authors
Hyoung Seop Kim
Date Issued
Jun-2018
Publisher
SPRINGER
Abstract
We propose a system for evaluating the stretch-flangeability of small-scale specimens based on the hole-expansion ratio (HER). The system has no size effect and shows excellent reproducibility, reliability, and economic efficiency. To verify the reliability and reproducibility of the proposed hole-expansion testing (HET) method, the deformation behavior of the conventional standard stretch-flangeability evaluation method was compared with the proposed method using finite-element method simulations. The distribution of shearing defects in the hole-edge region of the specimen, which has a significant influence on the HER, was investigated using scanning electron microscopy. The stretch-flangeability of several kinds of advanced high-strength steel determined using the conventional standard method was compared with that using the proposed small-scale HET method. It was verified that the deformation behavior, morphology and distribution of shearing defects, and stretch-flangeability results for the specimens were the same for the conventional standard method and the proposed small-scale stretch-flangeability evaluation system.
URI
http://oasis.postech.ac.kr/handle/2014.oak/92305
DOI
10.1007/s11837-018-2766-7
ISSN
1047-4838
Article Type
Article
Citation
JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY, vol. 70, no. 6, page. 912 - 917, 2018-06
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 KIM, HYOUNG SEOP
Dept of Materials Science & Enginrg
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