Abstract
Experiments have been made to investigate the effect of mean stress on fatigue crack propagation in 1 2 in. (12.7 mm) thick specimens of six aluminium alloys of high and low fracture toughness. The results are presented in terms of the stress intensity factor range, ΔK and the R value where R is the ratio of minimum to maximum stress. It was found that increasing R had little effect on the fatigue crack propagation rate for the alloy of very high fracture toughness ( L64) but that for the other alloys the rate increased rapidly with increasing R at high values of ΔK. A simple law is proposed relating the fatigue crack propagation rate to ΔK, the R value and the fracture toughness of the material.
Published Version
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