SEDL / STP / STP462-EB / STP32032S

The Effect of Stress Ratio During Crack Propagation and Fatigue for 2024-T3 and 7075-T6 Aluminum

Walker, K
Senior Research Scientist, Physical Sciences Laboratory, Lockheed-California Company, Burbank, Calif.

Pages: 14    Published: Jan 1970

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Abstract

An effective stress, σ = σ^max1-mΔσm where m is assumed to be a material constant, is shown to predict the effect of stress ratio on crack propagation and fatigue life for two aluminum alloys. Simple approximations of notch stress and strain using Neuber's notch rule are introduced to extend the predictions of stress-ratio effects to inelastic notch behavior.