Abstract
Subcritical crack growth for a single crack and coalescence for two collinear cracks were investigated for better understanding of fracture of brittle materials under the conditions close to actual services. The small Knoop indentation cracks were introduced on the surface of the glass specimen and subjected to sustained bend stress in water. Individual cracks before coalescence show the crack velocity dc/ dt higher than would be expected on the basis of the stress intensity factor K I for a single crack, indicating interaction between the cracks. The indentation cracks tend to show the initial decrease and then increase in dc/ dt with the stress intensity factor K I , whether it is single or coalescent.
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