An investigation of the recovery processes in 7075-T651 aluminum responsible for a stress decay during dynamic loading histories
Bentley, Richard Allen
Lindsey, G. H.
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This thesis investigates stress relaxation, strain softening, strain hardening and anelastic behavior as potential recovery processes in 7075-T651 alloy. A series of tests were conducted utilizing uniaxial specimens of 7075-T651 aluminum alloy as a representative aircraft structural material. The tests utilized both single and dual amplitude cyclic loading histories. The recovery mechanism felt to cause the observed stress decay was represented as an exponential decay due to an anelastic strain recovery behavior. With the data obtained, stress decay to stabilization was discussed from the analyst's and the metallurgist's point of view. By having a thorough knowledge of the recovery process of the structural materials, it will enable the structural analyst to develop better fatigue life prediction techniques.
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