Strain Rate Dependence Of The Hardness Ofglass And Meyer'S Law

Depth-sensing Vickers harndness tests on glass for various loading regimes were analyzed by applying a flow law for material deformation behaviour used by Han and Tomozawa, who investigated the creep behaviour of glass materials during indentation experiments. Load, indentation depth, and time were measured simultaneously at deformation rates covering 6 orders of magnitude. In all cases, the results yielded the well-known Meyer hardness law, by which the parameters of flow law are unequivocally determined using experimentally estimated Meyer parameters.