純アルミニウム薄板の疲労き裂進展挙動に及ぼす変動荷重の影響

概要

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In the case of anisotropic pure aluminum thin plate specimens, a small inclination between the loading direction and the rolling direction affects the crack propagation path, and the fatigue crack propagates in the rolling direction under appropriate conditions. In this report, this phenomenon is investigated for both constant and cyclic varying load conditions. The results are as follows. (1) Under constant loading conditions, the fatigue crack propagates in the rolling direction when the stress intensity factor range settles at 5.0〜7.0MPa√<m>. In the case of varying load conditions, the same phenomenon can also be explained using the equivalent stress intensity factor range. (2) Fatigue crack propagation in the rolling direction under cyclic varying load conditions is determined by the damage ratio calculated using the linear cumulative damage law. The lower limit of the damage ratio at which the crack propagates in the rolling direction is very small and is only about 10^<-3> for this specimen.
社団法人日本機械学会の論文
1997-11-25