Ring Crack Initiation Load of Silicon Nitride Bearing Balls

抄録

In relation to the static load rating of silicon nitride bearing balls, the ring crack initiation load P_R of hot isostatically pressed Si₃N₄ balls was investigated experimentally with emphasis on its statistical property. Initiation of a ring crack was detected using acoustic emission (AE) . P_R approximately followed a 2-parameter Weibull distribution with a shape parameter of about 9. An attempt was made to predict the mean and scatter of P_R using bending test data based on the concept of effective area. The predicted values were compared with the experimental results.