Shot-Peening Sensitivity of Aluminum With Corrosion-Preventive Coatings

Report No. ARL-TR-4304
Authors: Scott Grendahl and Daniel Snoha
Date/Pages: November 2007; 60 pages
Abstract: The U.S. Army Aviation and Missile Research, Development, and Engineering Center Aviation Engineering Division (Huntsville, AL) requested that the U.S. Army Research Laboratory Weapons and Materials Research Directorate (Aberdeen Proving Ground, MD) execute a program aimed at evaluating the shot-peening sensitivity of 7075-T73 aluminum with U.S. Army corrosion-preventive coatings for aluminum. The coatings represent the two most common coatings for aviation aluminum alloys. The study was a follow-up to previous work that investigated shot-peening sensitivity on the base material. During that study, it was discovered that the aluminum alloy showed decreased fatigue strength when shot-peened at high Almen intensities. The present study focuses on the shot-peening interaction with the coatings. Both studies develop data to correlate surface roughness, x-ray diffraction residual stress analysis, and fatigue strength at a prescribed stress intensity, Kt = 1.75.
Distribution: Approved for public release
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Last Update / Reviewed: November 1, 2007