Abstract
Subcritical growth and coalescence of two collinear cracks of different lengths were investigated using small Knoop indentation cracks in glass. Indentation cracks subjected to bending in water showed anomalous crack growth in terms of the stress intensity factor, KI. The crack growth velocity, dc/dt, was initially high, decreased and thereafter increased with increasing KI. The effective stress intensity factor, KI,eff, was calculated by adding a term describing the state of residual stress to explain this anomalous growth. Before crack coalescence, a large crack showed a crack velocity higher than expected from the coalescent crack. The coalescent crack velocity increased with KI,eff and the slope of dc/dt−KI,eff curves differed from that for a single crack, depending on the crack length.
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