Fractographically observed critical‐flaw boundaries in strength‐tested specimens of 2 polycrystalline ceramics were used in calculating critical stress‐intensity factors ( K IC )‐ Each ceramic exhibited a K IC which had little or no dependence on critical‐flaw characteristics and which agreed with the value obtained from independent determinations on artificially precracked specimens. Analyses both of fracture‐mirror sizes and of water‐enhanced subcritical crack growth data supported the evidence that K 1C is a material constant. The fracture‐mirror analysis further indicated that the parameter A/K IC , where A is the fracture‐mirror constant, is a dimensionless, material‐independent constant.
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Bansal et al. (1977) studied this question.
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