Repeated Indentation Method for Studying Cyclic Fatigue in Ceramics

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Abstract
A new method for studying cyclic fatigue in ceramics in proposed. It is based on the repeated indentation of the ceramic surface with a sharp indenter and on the relation between the indentation load and the number of indentation cycles needed to produce chipping. The technique is analyzed on the basis of observations on the development of the lateral cracks produced below the identation cavity in a high‐grade alumina and on the model of elastic/plastic indentation damage. It is shown that cyclic compressive forces across the lateral crack faces are needed to produce chipping and that a fatigue limit exists in terms of these forces. The scope and limitations of the technique are discussed.

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