アルミナの疲労き裂伝ぱにおけるき裂先端応力拡大係数K_<tip>の有効性と結晶粒径の影響

概要

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Bridging and interlocking elements, which are responsible for the stress shielding effect, are frequently observed in the wake of fatigue cracks. The crack growth curves arranged by the crack tip stress intensity factor K_<tip> (da/dN-K_<tip> curves), where the stress shielding effect is taken into consideration, almost coincide regardless of loading history, while those arranged by the apparent stress intensity factor K_<app> (da/dN-K_<app> curves) significantly depend on the loading history. The fatigue crack growth resistance increases with increasing grain size. The main reason for this grain size dependence is that the stress shielding effect becomes significant with increasing grain size. The crack growth curves arranged by K_<tip> almost coincide regardless of grain size.
1996-09-25