Effect of dilatation on the elasto-plastic response of bulk metallic glasses under indentation
Conference
Prasad, A, Dao, M, Ramamurty, U. (2010). Effect of dilatation on the elasto-plastic response of bulk metallic glasses under indentation
. 1224 221-225.
Prasad, A, Dao, M, Ramamurty, U. (2010). Effect of dilatation on the elasto-plastic response of bulk metallic glasses under indentation
. 1224 221-225.
Unlike metals, elasto-plastic response of bulk metallic glasses (BMGs) follows closely that of granular materials through pressure dependent (or normal stress) yield locus and shear stress induced material dilatation. While on a micro-structural level, material dilatation is responsible for stress-softening and formation of localized shear band, its influence on the macro-scale flow and deformation is largely unknown. In this work, we systematically analyze the effect of material dilatation on the gross indentation response of Zr-based BMG via finite element simulation. The strengthening/softening effect of load-depth response and corresponding stress-strain profiles are presented in light of differences in elastic-plastic regimes under common indenters. Through comparison of the numerical predictions with existing experimental data, we draw conclusions to guide the selection of a suitable dilatation parameter for accurately predicting the gross response of BMGs.
