발간논문

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Vol.19, No.1, 28 ~ 36, 1981
Title
Planar Anisotropy of Fatigue Crack Propagation Rate in Aluminum and 2024 - T4 Aluminum Alloy
김정수Joung Soo Kim, 이동녕Dong Nyung Lee
Abstract
Planar anisotropy of fatigue crack growth rates in 2024-T4 aluminum alloy and cold worked and recrystallized aluminum strips has been investigated with emphasis on effects of precipitates, inclusions, and preferred orientation. All specimens except recrystallized aluminum specimens showed the rapider rate of region II fatigue crack growth in the direction of load normal to the rolling direction than in the loading direction parallel to the rolling direction. Such an anisotropy was attributed to arrangement of precipitates and inclusions in the rolling direction for 2024-T4 aluminum alloy, and to grains elongated in the rolling direction for cold rolled aluminum strips. The effect of the preferred orientations seemed to be less important to the anisotropy than the mechanical fiberings. The crack propagated along the <110> directions on the {100} planes for the 2023-T4 aluminum specimen. The crack opening displacement at the fatigue rate transition from region II to region III for 2024-T4 aluminum and cold rolled commercial purity aluminum was calculated to be 6-9㎛.
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