Abstract
Four-point bending dynamic fatigue tests were carried out at five different crosshead speeds from 5×10-4 to 5×100mm/min in air at room temperature. Hot pressed silicon nitride ceramics was used for the tests and ground with 600, 400 and 200 grit resin bonded diamond wheels perpendicular to the direction of bending stress. Both the specimens ground with the 400 and 200 grit wheels showed a decrease in the fatigue parameter and fracture strength, while no decrease was observed in the specimen ground with the 600 grit wheel. It is suggested that grinding induces surface flaws and that the mean fracture strength of specimens ground with the 400 and 200 grit wheels tested at low crosshead speeds is lowered by slow crack growth of the surface flaws which are easily affected by stress corrosion.
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