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.
Original language | English |
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Pages (from-to) | 7808-7823 |
Number of pages | 16 |
Journal | Journal of Materials Science |
Volume | 52 |
Issue number | 13 |
DOIs | |
Publication status | Published - 2017 Jul 1 |
Externally published | Yes |
Bibliographical note
Funding Information:This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIP) (No. 2014R1A2A1A10051322).
Publisher Copyright:
© 2017, Springer Science+Business Media New York.
ASJC Scopus subject areas
- General Materials Science
- Mechanics of Materials
- Mechanical Engineering