Description:
<jats:p> <jats:italic>A modified indentation technique for measuring toughness is described. The method retains the elastic/plastic basis of previous contact fracture descriptions but eliminates explicit reference to residual stress parameters in the toughness formulation. Accordingly, improved correlations between indentation data and “conventional” K<jats:sub>c</jats:sub> values are obtained, even for materials (e.g. anomalous glasses) with nonideal deformation responses</jats:italic>.</jats:p>