A study of the effect of the ion exchange strengthening method on macroflaws in sodalime glass
Burcham, William Richard
von Schwind, J.J.
Leonesio, Robert B.
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This work examines the strengthening effect of the ion exchange method of chemical tempering on two specific types of macroflaws, a thermally blunted crack and a sawcut, in soda-lime glass. The use of these macroflaws permitted a quantitative fracture mechanics analysis of the amount of strengthening produced, and a greater access for ion exchange at the flaw tip than could be afforded by a sharp crack. The specimens were treated for various lengths of time in a potassium nitrate bath at 365°C. A double cantilever cleavage technique of measuring fracture surface energy was used to find G , the strain energy release rate. The average increase in G was found to be roughly linear reaching a maximum level of approximately 200% at twelve hours of treatment for the blunted crack specimen type, while a similar maximum of approximately 200% was reached at six hours of treatment for the sawcut specimen type.
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