Effect of Tensile Prestrain on Fatigue Strength of Aluminum Alloy in High Cycle Fatigue

[+] Author and Article Information
P. R. Arora, M. R. Raghavan

Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India

J. Eng. Mater. Technol 95(2), 76-82 (Apr 01, 1973) (7 pages) doi:10.1115/1.3443135 History: Received June 01, 1972; Online August 17, 2010


The effect of tensile prestrain on rotating bending fatigue strength of B51-S aluminum alloy in the solution treated and precipitation hardened condition, has been studied at fatigue life in the range of 5 × 104 to 106 cycles. The fatigue strength decreases when the tensile prestrain is 1.5 percent. At a higher prestrain of 3 to 4 percent, fatigue strength is close to that of virgin material. The cyclic stress-strain curves for virgin and prestrained materials are linear. There is no perceptible strain hardening/strain softening of the material under fatigue loading. The cyclic Young’s modulus is about 4 percent lower than the static modulus irrespective of the material condition. The relative disposition of static bending stress-strain curves in the inelastic region for virgin and prestrained materials shows qualitatively the relative disposition of the corresponding S-N curves.

Copyright © 1973 by ASME
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