Influence of indentation crack configuration on strength and fatigue behaviour of soda-lime silicate glass

Abstract Depending on the conditions under which an indentation is performed or indented specimen stored, different crack configurations can be obtained. In this work, the influence of these different configurations on the failure process, strength and fatigue behaviour of soda-lime silicate glass, was investigated. To obtain the different crack geometries, indentations were performed in moist air and deionized water with two different dwell times. In this way, typical “half-penny” and deeper “circular” cracks were obtained. Both as-indented and annealed samples were studied. An extensive fractographical analysis revealed a strong “pinning” effect of lateral cracks on the radial crack propagation for indentations obtained in air with short dwell times. Strength measured both in inert and active environments was shown to be lower for indentations obtained in water with longer dwell times. An analogous trend was observed for the lifetime results obtained in static fatigue. Some discrepancies were observed in time-to-failure predictions for “half-penny” indentation cracks and these were related to the interaction between the lateral and radial cracks.

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