Abstract

In some coarse-grained monolithic ceramics such as alumina one can observe an increase in crack resistance with increasing crack length (R-curve behavior). Amongst the mechanisms which are postulated to contribute to the increasing crack resistance of alumina is the energy dissipation by formation of microcracks in a damage zone around a macro-crack. As this microcrack formation gives rise to a reduction in all elastic modulus, it should be possible to study the existence of such microcracking by measuring the appropriate sound velocity in materials exhibiting R-curve behavior. We undertook such measurements together with Small Angle X-Ray Scattering experiments.

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