The cyclic fatigue behavior of a resinoid-bonded abrasive was determined in ambient air (22°C and 50 percent relative humidity). The number of cycles to failure was dependent on the cyclic stress by a power functional relation, consistent with fracture mechanics concepts of fatigue crack growth. Additionally, it was found that the cyclic fatigue behavior did not depend on the cyclic stress waveform or the test sample geometry and loading (four-point bend bars and radically loaded nonreinforced and reinforced wheels). Based upon fracture mechanics concepts, a reliability analysis was developed for reinforced, resinoid-bonded abrasives in service, taking into account the variability in strength and the fatigue behavior exhibited by these materials.

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