ATLAS of yield surfaces for strongly textured FCC polycrystals

Abstract

Discrete yield surfaces for several generic texture components, including randomness, found in aluminium alloys have been generated and used to calibrate the yield function Yld2004-18p. It is generally observed that the roundness of the corners of the yield surface increases, and the stress and strain ratios flatten towards isotropic values, as the ratio of random component increases. A short investigation on the effect of number of points and homogenization approach on calibration of the yield function seems to indicate that the number of points used in the calibration has a stronger effect than the homogenization approach. Furthermore, it is also shown that setting the exponent as a free parameter in calibrating the yield function could lead to better fits.