Residual stress effects in sharp contact cracking. II - Strength degradation

A strength analysis for brittle surfaces with dominant flaws produced under elastic-plastic indentation loading is presented. The condition for failure is formulated in terms of stress intensity factors representing driving forces of applied tension and residual indentation fields. Incorporation of...

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Bibliographic Details
Published in:Journal of materials science 1979-09, Vol.14 (9), p.2225-2235
Main Authors: Marshall, D B, Lawn, B R, CHANTIKUL, P
Format: Article
Language:English
Online Access:Get full text
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Summary:A strength analysis for brittle surfaces with dominant flaws produced under elastic-plastic indentation loading is presented. The condition for failure is formulated in terms of stress intensity factors representing driving forces of applied tension and residual indentation fields. Incorporation of residual indentation component depresses the equilibrium applied stress-crack function which is accentuated at small crack size, so that the function passes through a maximum. The starting size of the median cracks may lie on either side of this maximum depending on the relative intensity of the residual indentation field. Observations of median crack growth in annealed and tempered soda-lime glass discs taken to failure in biaxial flexure confirm the existence of an energy barrier to crack instability, and these manifestations of the residual indentation field in predicting degradation characteristics for prospective adverse contact conditions are discussed.
ISSN:0022-2461