Abstract
Crack propagation experiments were performed on a 0·2% C 0·9% Mn (IS-1020) steel for various load ranges and stress ratios. At constant load range, the life of the specimen decreased as the load ratio increased. The crack growth data were analysed in terms of ΔK eff as a function of stress ratio R. The data covered R values for 0, 0·15, 0·30, 0·35 and 0·40 and a good relation was obtained for U = 0·50 + 0·45R + 0·15R 2 . A crack growth rate equation was also developed.
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