Key factors of stretch-flangeability of sheet materials
- Authors
- 손석수
- Issue Date
- 7월-2017
- Publisher
- SPRINGER
- Citation
- JOURNAL OF MATERIALS SCIENCE, v.52, no.13, pp.7808 - 7823
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS SCIENCE
- Volume
- 52
- Number
- 13
- Start Page
- 7808
- End Page
- 7823
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/139826
- DOI
- 10.1007/s10853-017-1012-y
- ISSN
- 0022-2461
- 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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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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