Abstract
Abstract Precision force–displacement measurements have been made of the continuous indentation of two glassy carbon materials using three pyramidal indenters with different apical face angles. The data for all three indenters shows hysteresis with almost complete recovery on unloading despite contact pressures reaching a considerable fraction of the elastic modulus. The extent of hysteresis on unloading was found to depend upon the apical angle of the pointed indenters. The data are analysed following a procedure developed by Oliver and Pharr. It is found that the hardness decreases with increasing apical angle of the indenter whereas the modulus is almost independent of the indenter angle except for the sharpest indenter upon the initiation of radial cracks about the impression during loading.
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