セラミックスの静・動疲労と多重モード・ワイブル分布

抄録

An attempt was made to combine the subcritical crack growth law with Weibull's bi-modal inert strength distribution function. The results obtained are as follows:
(1) The inert strength distribution function after proof test was derived from Weibull's bi-modal distribution function involving both effects of internal and surface cracks of ceramics.
(2) The static fatigue life distribution after proof test was formulated by assuming that only surface cracks may grow subcritically.
(3) On the assumption that the strength distribution function after subcritical rack growth may be mapped into new inert strength one, the bi-modal distribution function for constant loading rate test was formulated.
(4) The newly obtained bi-modal distribution function tended to coincide with the uni-modal one for internal cracks as the loading rate increased infinitely.