Abstract
Abstract A technique for measuring crack velocity in insulating materials, using conductive lines on the surface of a polished sample, was developed to study sharp indentation of alumina. The location of the crack tip as a function of time can be determined by recording the exact time during the indentation cycle when the conductive lines are broken. Using this technique it is thus possible to gather knowledge about crack initiation and crack growth during indentation in non-transparent materials. The initiation and the growth of the radial cracks during Vickers indentation in he-grained Al2O3 were studied as a function of loading and unloading rate. It was seen experimentally that, if the indentation loading rate is changed from 10 to 0·003 Ns−1, there is a transition from predominantly transgranular fracture to intergranular fracture for this particular material. The technique shows that a short crack (less than 10μm) may pop in during loading for both loading rates, but the main propagation occurs duri...
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