Abstract
Crack closure experiments were performed on 6063-T6 Al-alloy for different stress ratios, R = 0, 0·1, 0·2 and 0·3 at different prestrains, 0%, 2% and 3%. The growth rate of fatigue crack in the prestrain material was more than that of as-received material. It was shown by crack opening displacement measurements that crack closure occurred to a lesser extent in prestrained material. On the basis of these experimental results a good correlation was obtained for da dN and ΔK eff for the single edged notched specimen as well as the centrally notched specimen using the developed equation for U. The significance of the increased yield strength for fatigue crack growth is discussed. Fatigue life decreased as the percentage of prestrain increased.
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