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Analytical Approach to Failure Determination of Advanced High‐Strength Steel in Stretch‐Bending Mode
Author(s) -
Lee Jae-wook,
Barlat Frédéric
Publication year - 2021
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.202000124
Subject(s) - materials science , ultimate tensile strength , bending , failure mode and effects analysis , plasticity , dual phase steel , composite material , structural engineering , alloy , deformation (meteorology) , microstructure , engineering , martensite
Experimental and analytical studies on the stretch‐bending characteristics of advanced high‐strength steel sheets, primarily used in the automotive industry, are conducted. Herein, the stretch‐bending test, in which a specimen fixed at both ends is bent at its center with sharp punches until failure occurs, is conducted. Assuming that the failure of the material occurred at the maximum tensile force, a relationship between applied force and forming height is derived. Nine steels including high‐strength low‐alloy, dual‐phase, and transformation‐induced plasticity steels are tested, and the calculated results are compared with experimental limit‐forming heights. Finally, a failure criterion based on process variables and tensile properties of the material is proposed based on the deformation in the sheet thickness direction.