| Abstract: | Using experimental data published earlier [Vial et al., Int. J. Mech. Sci. 25, 899 (1983)], values of the exponent m in the Hill (1979) yield criterion [Hill, Math. Proc. Cambridge Phil. Soc. 85, 179 (1979)] are calculated for each of the four special cases suggested. With these findings, stress-strain relations for plane-strain compression are derived and predictions using these derived equations are compared with experimental results. Comparisons between prediction and experiment are reasonable in all cases and it is suggested that the discrepancies could arise because of the assumption of planar isotropy (via the use of an average r-value) and because the exponent m apparently varies with induced strain. |
