Abstract
Flaws introduced into physically tempered laths of glass with a Vickers indenter have been used in controlled fracture experiments in flexure. Provided the flaw length extended beyond the dimension of the indentation fracture always initiated from this site on bending. After making allowance for plastically induced residual stress fields about the indentation site it was possible to use this technique to determine the tempering level of the glass. It was also possible by varying the stress rate to determine the stress corrosion behaviour of these tempered glasses. The results were analysed in terms of a recent fracture mechanics treatment by Hagan et al1 of stress corrosion cracking in tempered glasses. This approach enabled the stress corrosion index n, in V = AKn to be determined. It was also observed that the extent of the fracture mirrors in these indented and subsequently fractured laths was a sensitive function of loading rate and environment. A simple relationship between the ratio of the surface to bulk dimensions of the fracture mirror in both materials is derived.
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Hagan J.T. and Swain M.V., to be published.
Swain M.V. and Hagan J.T., to be published.
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© 1978 Plenum Press, New York
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Swain, M.V., Hagan, J.T., Field, J.E. (1978). Indentation Induced Strength Degradation and Stress Corrosion of Tempered Glasses. In: Bradt, R.C., Hasselman, D.P.H., Lange, F.F. (eds) Flaws and Testing. Fracture Mechanics of Ceramics, vol 3. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-7017-2_14
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DOI: https://doi.org/10.1007/978-1-4615-7017-2_14
Publisher Name: Springer, Boston, MA
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