Fracture toughness and evaluation of coating strength with an initial residual stress field |
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Authors: | A V Byakova V G Gorbach |
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Affiliation: | (1) Polytechnic Institute, Kiev |
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Abstract: | The effect of residual elastic stresses on the geometry of cracks which arise with contact and spontaneous failure of brittle coatings made of high-strength compounds is studied. Conditions are established for the correctness of fracture toughness KIc tests with indentation of a standard Vickers pyramid as applied to surface layers with an inhomogeneous structure and an initial residual stress field. Taking account of the anisotropy of fracture toughness established by experiment a reliable approach is suggested for evaluating the brittle strength of coatings in the presence of residual stresses.Translated from Problemy Prochnosti, No. 1, pp. 51–61, January, 1994. |
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