Synopsis : The deformation behavior of a high-strength steel alloy with a tensile strength of 590 MPa is investigated both experimentally and analytically to clarify the effect of the material model (anisotropic yield function) on the predictive accuracy of the finite element simulation of hole expansion. Biaxial tensile tests of the test material have been carried out. Measured contours of plastic work and the directions of plastic strain rates are found to be in good agreement with those predicted using the Yld2000-2d yield function with an exponent of 6. The anisotropy in uniaxial tensile flow stresses and r-values has been also in good agreement with those predicted by the Yld2000-2d yield function, as opposed to the previous study [T.
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