Abstract
Utilizing experimental data of the Knoop hardness versus applied load for several ceramics, the applicability of the proportional specimen resistance (PSR) model proposed by Li and Bradt to describing the indentation size effect (ISE) observed in a relatively wide range of applied load was examined. The PSR model was proven to be insufficient for representing the experimental data and was modified based on the consideration of the effect of machining-induced residually stressed surface on the hardness measurements.
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