Effect of Surface Forces on Subcritical Crack Growth in Glass

Abstract

Data on the growth of cracks tested in aqueous solutions were interpreted in terms of surface force theory. For applied stress intensity factors greater than 0.25 MPa · m½, the position and the slope of the curves and their dependence on pH and ion concentration can be explained in terms of surface force theory, provided these forces are of a magnitude and range that are representative of those involved in the cohensive bonding of solids. Weaker forces, such as structural, double‐layer, or dispersion forces, have little effect on crack growth in silica glass for KI > 0.25 MPa · m½.