The fracture and fatigue of sintered diamond compact
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The fracture stress of the sintered diamond compact is reduced under cyclic loading. The measurements were made using a dynamic test machine, with a diamond compact cutter impacting onto cemented tungsten carbide. The fracture mode under the present experimental conditions is brittle shear fracture. Crack growth is believed to be promoted by a relatively small tensile stress component at the tip of the crack due to the very large applied shear stresses. A possible failure mechanism is proposed based on examination of SEM micrographs of the damaged area. The results obtained in the present test indicate that the asymptotic value of the failure load corresponding to an infinite number of cycles is far above the reported value of force for cutting rocks under similar geometric conditions.
KeywordsFatigue Carbide Tensile Stress Failure Mechanism Fracture Stress
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