研削されたセラミックスの保証試験後の曲げ強度

概要

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The Weibull distribution of the bending strength of silicon nitride specimens ground parallel to the longitudinal direction was measured before and after proof testing. The effect of grinding residual stresses on crack growth and strength degradation during proof testing was investigated. The results were obtained as follows : (1) The stress intensity factor K_<res> due to grinding residual stresses was negative for a dominant surface crack in bending specimens. Grinding residual stresses serve to inhibit crack growth during proof testing. (2) As the length of a dominant surface crack grown stably by proof testing got large, the stress shielding effect due to K_<res> became small. (3) Apparent strength degradation during proof testing occurs when the proof stress for ground specimens is set to higher values than that for lapped specimens with the increment of the bending strength due to grinding residual stresses taken into account.
一般社団法人日本機械学会の論文
1998-07-25