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Journal of Materials Science
Published in: Journal of Materials Science 13/2017

20-03-2017 | Metals

Key factors of stretch-flangeability of sheet materials

Authors: Jae Ik Yoon, Jaimyun Jung, Jung Gi Kim, Seok Su Sohn, Sunghak Lee, Hyoung Seop Kim

Published in: Journal of Materials Science | Issue 13/2017

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Abstract

Stretch-flangeability evaluated using hole-expansion testing represents the ability of sheet materials to resist edge fracture during complex shape forming. Despite a property imperative for automotive part applications of advanced high-strength steels, factors governing stretch-flangeability are not yet well understood. In this study, the mechanical properties of a selected group of materials with different microstructures were investigated using tensile, fracture toughness, and hole-expansion tests to find the factor governing the stretch-flangeability that is universally applicable to a variety of metallic materials. It was found that the fracture toughness of materials, measured using the fracture initiation energy, is a universal factor governing stretch-flangeability. We verified that fracture toughness is the key factor governing stretch-flangeability, showing that the hole-expansion ratio could be well predicted using finite element analysis associated with a simple ductile damage model, without explicitly taking into account the microstructural complexity of each specimen. This validates the use of the fracture toughness as a key factor of stretch-flangeability.
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Metadata
Title
Key factors of stretch-flangeability of sheet materials
Authors
Jae Ik Yoon
Jaimyun Jung
Jung Gi Kim
Seok Su Sohn
Sunghak Lee
Hyoung Seop Kim
Publication date
20-03-2017
Publisher
Springer US
Published in
Journal of Materials Science / Issue 13/2017
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-017-1012-y

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