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Prediction of Fatigue Life in 2024-73 Aluminum Using X-ray half-value breadth  

Kim, Soon-Ho (Dept. of Automotive Mechanical Engineering, Silla University)
Cho, Seok-Swoo (Dept. of Automotive Engineering, Samchok University)
Park, Jung-Hyeon (Dept. of Automotive Mechanical Engineering, Silla University)
Publication Information
International Journal of Precision Engineering and Manufacturing / v.3, no.2, 2002 , pp. 78-86 More about this Journal
Abstract
In general, X-ray diffraction method detects the changes of crystal lattice under material surface using the angle of diffraction 2$\theta$. This technique which deals with in the presented paper can be applied to a behavior on the slipped band or the micro crack cause to material degradation. The relation between half-value breadth and cycle numbers shows three stages, which consist of rapid decrease in the initial cycle, slight decrease in the middle cycle, and then rapid decrease in the final cycle. The ratio of half-value breadth has a constant value on B/B$\_$0/ - N diagram under the loading condition except early part of fatigue life. The ratio of half-value breadth B/B$\_$0/ - log N$\_$f/ with respect to number of cycle to failure N$\_$f/ has linear behavior on B/B$\_$0/ - log N$\_$f/ diagram. Therefore, the evaluation of fatigue life by the average gradient has much less mean error than the estimation of fatigue life by log B/B$\_$0/ - log N/N$\_$f/ relation.
Keywords
X-ray diffraction; Half-value breadth; Diffraction angle; Average gradient; Individual gradient; Cycle ratio;
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