Abstract
It is shown that for a variety of ceramics the threshold for microfracture during elastic-plastic indentation corresponds to radial, rather than subsurface median, crack formation. This is contrary to the fundamental assumption of current models for threshold crack nucleation by sharp indenters. The significance of this observation in terms of strength reduction is discussed.
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Lankford, J. Threshold microfracture during elastic-plastic indentation of ceramics. J Mater Sci 16, 1177–1182 (1981). https://doi.org/10.1007/BF01033828
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DOI: https://doi.org/10.1007/BF01033828