Failure During Sheared Edge Stretching |
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Authors: | BS Levy CJ Van Tyne |
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Affiliation: | (1) B.S. Levy Consultants Ltd., 1700 E. 56th St., Suite 3705, Chicago, IL 60637, USA;(2) Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO 80401, USA |
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Abstract: | Failure during sheared edge stretching of sheet steels is a serious concern, especially in advanced high-strength steel (AHSS)
grades. The shearing process produces a shear face and a zone of deformation behind the shear face, which is the shear-affected
zone (SAZ). A failure during sheared edge stretching depends on prior deformation in the sheet, the shearing process, and
the subsequent strain path in the SAZ during stretching. Data from laboratory hole expansion tests and hole extrusion tests
for multiple lots of fourteen grades of steel were analyzed. The forming limit curve (FLC), regression equations, measurement
uncertainty calculations, and difference calculations were used in the analyses. From these analyses, an assessment of the
primary factors that contribute to the fracture during sheared edge stretching was made. It was found that the forming limit
strain with consideration of strain path in the SAZ is a major factor that contributes to the failure of a sheared edge during
stretching. Although metallurgical factors are important, they appear to play a somewhat lesser role. |
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Keywords: | formability forming limit curve sheared edge sheet steel |
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