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Title of Journal: Int J Mater Form

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Abbravation: International Journal of Material Forming

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Springer-Verlag

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1960-6214

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Hole expansion simulation of high strength steel s

Authors: K Hashimoto T Kuwabara E Iizuka J W Yoon
Publish Date: 2010/06/12
Volume: 3, Issue: 1, Pages: 259-262
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Abstract

The deformation behavior of highstrength steel sheet during hole expansion is investigated both experimentally and analytically to clarify the effects of the material model anisotropic yield function on the finite element simulation of a hole expansion The test material used in the hole expansion test is a dualphase steel alloy with a tensile strength of 780 MPa The elasticplastic deformation behavior of the test material is precisely measured using biaxial tensile tests with cruciform specimens to determine the appropriate anisotropic yield function for the test material Moreover forming simulations of the hole expansion using selected yield functions are carried out The Yld20002d function Barlat F Brem JC Yoon JW Chung K Dick RE Lege DJ Pourboghrat F Choi SH and Chu E Int J Plasticity 19 2003 12971319 with an exponent of 4 has given the closest agreement with the experimentally measured contours of plastic work and the directions of the plastic strain rates It was also found that the Yld20002d function with an exponent of 4 has given the closest agreement with the observed thickness distribution along the expanded hole edge Consequently anisotropic yield functions significantly affect the predictive accuracy of the deformation behavior of a sheet during a hole expansion

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