Estimation of ion exchange layers for soda-lime-silicate glass from curvature measurements
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Many commercial glasses exhibit subcritical crack growth in the presence of environments that contain water. The phenomenon of subcritical crack growth is strongly dependent on the pH of the environment (see e.g. Wiederhorn and Johnson , Simmons and Freiman  and Gehrke et al. [3, 4, 5]). Both the shape and position of the crack growth curve can change as a function of pH––static fatigue limits can be created or can disappear [3, 4, 5], as can low stress intensity factor, crack-growth plateaus [2, 5]. Often the pH at the crack interface is determined by the composition of the glass itself , as the process of ion exchange between mobile alkali ions in the glass and hydronium ions in the water leaves behind an excess of hydroxyl ions and consequently a basic solution at the crack interface. Furthermore, glasses like silica glass, which have no mobile ions, have acidic solutions , because of the acidic nature of the silanol groups that cover the fracture surface of the silica...
KeywordsStress Intensity Factor Crack Interface Volumetric Strain Soda Lime Glass Linear Strain
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