Abstract
Fracture and subcritical crack growth were investigated using indented cracks in sodalime glass, aluminosilicate glass and borosilicate glass. The effect of residual stress was experimentally determined by obtaining the fracture toughnesses for cracks of various lengths. Extended cracks of various lengths were produced at the same indentation load. From the results, dimensionless indenter-material constants χ r were determined for the surface crack and depth crack of semi-elliptical shape. Subcritical crack growth data for the as-indented short cracks show anomalous behavior, i.e. negative dependence of crack velocity on the stress intensity factor during small crack growth. This decrease in the crack velocity for the as-indented short crack can be explained by taking account of the residual stress.
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