Corrosion fatigue in metals has been defined as the simultaneous action of cyclic stress and chemical attack on a metal structure. In the study Effect of Humidity and Several Surface Coatings on the Fatigue Life of 2024-T351 Aluminum Alloy conducted by the Department of Mechanical Engineering at the Virginia Polytechnic Institute and State University, a technique involving the application of a protective chromate coating was used to minimize corrosion fatigue damage in aluminum. Three factors were used in the investigation with 5 replicates for each treatment combination: coating, at 2 levels, and humidity and shear stress, both with 3 levels. The fatigue data, record eel in thousands of cycles to failure, are presented here.,(a) Perform an analysis of variance with a = 0.01 to test for significant main and interaction effects,,(b) Make a recommendation for combinations of the three factors that would result in low fatiguedamage.
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