Alternative technique for analyzing instrumented indentation data

A new analysis technique for calculating the hardness, modulus, and contact area from indentation data obtained using pyramidal or conical indenters w as formulated and compared with another commonly used technique. Experiment al data using a Berkovich indenter to indent fused silica and tungsten were examined. In addition, finite element modeling results were used to examin e the effectiveness of the analytical techniques when a wide range of mater ials properties was considered. The new technique relies on the slope of th e loading curve rather than the indenter displacement as an input. It is sh own that the new technique is far less affected by the deviation of the geo metry of the indenter from its intended shape. This effect removes the nece ssity to have detailed descriptions of the precise tip geometry in some cas es. The new technique does not reduce errors associated with pile up of mat erial near the indenter.