Abstract
The subcritical crack growth of macroscopic cracks in vitrified grinding wheels was examined using double torsion specimen. The relations between crack velocity 'v'if and stress intensity 'K' for wheels with different grain sizes were investigated. These data provided the linear correlation in plot of log v vs. log K until sufficiently slow crack growth region. In one K-v data, the relation was logv=51.7logK-18.1Assuming that the crack velocity is still being sufficiently lower region, expected lifetime 't'at a constant stress 'σ' can be derived ast=2K2-n/πaf2(n-2)σ2where a and n, and f are empirically determined constants, and geometric constant, respectively. The lifetime vs. applied stress diagrams in which K was taken as the parameter were obtained. Fracture toughness obtained by double torsion was confirmed to show slightly higher value than by four point bending.
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