1997 年 1997 巻 42 号 p. 61-66
Fatigue life of ceramic materials scatter in a widerange depending on an inherent flaw size. Therefore, it is important to conduct proof test as the procedure to exclude components with flaws, whose size is larger than a certainsize. In this paper, a numerical analysis of sintered siliconnitride were conducted to calculate minimum cyclic fatigue life after proof testing. Its reliability was predicted by the procedure based on 2 parameter weibull distribution of the fracture stress of a smooth specimen and plane-strain fracture toughness value. Cyclic fatigue tests of Si3N4 was conducted after proof testing to compare with a numerical simulation. The numerical simulation coincided with the experimental life distribution.