Open Access System for Information Sharing

Login Library

 

Article
Cited 0 time in webofscience Cited 1 time in scopus
Metadata Downloads

Prediction of hole expansion ratio for various steel sheets based on uniaxial tensile properties

Title
Prediction of hole expansion ratio for various steel sheets based on uniaxial tensile properties
Authors
Kim, Jae HyungKwon, Young JinLee, TaekyungLee, Kee-AhnKim, Hyoung SeopLee, Chong Soo
POSTECH Authors
Kim, Hyoung SeopLee, Chong Soo
Date Issued
Jan-2018
Publisher
KOREAN INST METALS MATERIALS
Abstract
Stretch-flangeability is one of important formability parameters of thin steel sheets used in the automotive industry. There have been many attempts to predict hole expansion ratio (HER), a typical term to evaluate stretch-flangeability, using uniaxial tensile properties for convenience. This paper suggests a new approach that uses total elongation and average normal anisotropy to predict HER of thin steel sheets. The method provides a good linear relationship between HER of the machined hole and the predictive variables in a variety of materials with different microstructures obtained using different processing methods. The HER of the punched hole was also well predicted using the similar approach, which reflected only the portion of post uniform elongation. The physical meaning drawn by our approach successfully explained the poor HER of austenitic steels despite their considerable elongation. The proposed method to predict HER is simple and cost-effective, so it will be useful in industry. In addition, the model provides a physical explanation of HER, so it will be useful in academia.
Stretch-flangeability is one of important formability parameters of thin steel sheets used in the automotive industry. There have been many attempts to predict hole expansion ratio (HER), a typical term to evaluate stretch-flangeability, using uniaxial tensile properties for convenience. This paper suggests a new approach that uses total elongation and average normal anisotropy to predict HER of thin steel sheets. The method provides a good linear relationship between HER of the machined hole and the predictive variables in a variety of materials with different microstructures obtained using different processing methods. The HER of the punched hole was also well predicted using the similar approach, which reflected only the portion of post uniform elongation. The physical meaning drawn by our approach successfully explained the poor HER of austenitic steels despite their considerable elongation. The proposed method to predict HER is simple and cost-effective, so it will be useful in industry. In addition, the model provides a physical explanation of HER, so it will be useful in academia.
Keywords
HIGH-STRENGTH STEELS; FERRITIC STAINLESS-STEEL; STRETCH-FLANGEABILITY; SHEARED EDGE; TWIP STEEL; R-VALUE; TEXTURE; FORMABILITY; MICROSTRUCTURE; ANISOTROPY
URI
http://oasis.postech.ac.kr/handle/2014.oak/50623
DOI
10.1007/s12540-017-7288-2
ISSN
1598-9623
Article Type
Article
Citation
METALS AND MATERIALS INTERNATIONAL, vol. 24, no. 1, page. 187 - 194, 2018-01
Files in This Item:
There are no files associated with this item.

qr_code

  • mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Related Researcher

Researcher

 LEE, CHONG SOO
Graduate Institute of Ferrous Technology
Read more

Views & Downloads

Browse