Abstract
The effect of straight‐chain alcohols having chain lengths of 6 to 12 carbon atoms on crack propagation in glasses was studied. The test was a modification of the double‐cantilever‐beam technique. Plots of crack velocity vs stress intensity factor, K, were trimodal, similar to those for glass tested in N2 gas of varying relative humidity. Crack velocities in the two regions of lowest K could be explained using a model derived by Wiederhorn for the effect of water on crack propagation and were independent of alcohol chain length. The chain length of the alcohol affected the results only in the water‐independent high‐K region, where crack velocity increased monotonically with decreasing chain length at a given K. There was no systematic effect of glass composition within the Na2O‐CaO‐SiO2 system, but crack velocities at a given K in a 3BaO‐5SiO2 glass were higher under all conditions than those in Na2O‐CaO‐SiO2 glasses.
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