TY - JOUR
T1 - Key factors of stretch-flangeability of sheet materials
AU - Yoon, Jae Ik
AU - Jung, Jaimyun
AU - Kim, Jung Gi
AU - Sohn, Seok Su
AU - Lee, Sunghak
AU - Kim, Hyoung Seop
N1 - 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.
PY - 2017/7/1
Y1 - 2017/7/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85015651818&partnerID=8YFLogxK
U2 - 10.1007/s10853-017-1012-y
DO - 10.1007/s10853-017-1012-y
M3 - Article
AN - SCOPUS:85015651818
SN - 0022-2461
VL - 52
SP - 7808
EP - 7823
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 13
ER -