关键词: 氮化硅, 寿命预测, 陶瓷球

Abstract: The relation expression between failure probability and rolling contact fatigue life is deduced with WEIBULL fracture statistic method for the silicon nitride ceramic ball in ball-cylinder geometric model. The tensile stress life model about silicon nitride ceramic balls is set up between rolling contact fatigue life and contact stress on the basis of the correlative numerical solution between the rating life and the maximum contact stress. The tensile stress life model is conceived basing on maximum principal tensile stress. It is indicated that the tensile stress life model is feasible through rolling contact fatigue test with different stress level. It is verified by the tensile stress life model that silicon nitride ceramic balls failed by the maximum principal tensile stress, not by the maximum shear stress. In comparison with the L-P shear stress life model, the tensile stress life model is reasonable for rolling contact fatigue life prediction of silicon nitride ceramic balls.

Key words: Ceramic ball, Life prediction, Silicon nitride