Department of Civil Engineering
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Item Investigation of fatigue crack growth after a single cycle peak overload in IS 1020 steel(Elsiever, 1992) Singh, Shamsher BahadurCrack propagation experiments were conducted on IS 1020 steel for various overload ratios (1·2, 1·3 and 1·4). On the basis of these experiments one power law is developed to predict the crack propagation delay period. The delay period after application of a single overload was found to increase as the magnitude of the overload increased. Crack growth also decreased after the application of an overload cycle but after a certain number of cycles it tended to return to the crack propagation rate for constant amplitude loading (CAL).Item A study of fatigue crack growth IS-1020 steel under constant-amplitude loading(Elsiever, 1992) Singh, Shamsher BahadurCrack propagation experiments were performed on IS-1020 steel for various load ranges and stress ratios. At constant maximum load, the life of the specimen increased as the load ratio increased. The crack growth data were analysed in terms of as a function of stress ratio R. The data covered R values of 0, 0·1, 0·2, and 0·3, and a good relation was obtained for . A crack growth rate equation was also developed.Item Experimental observations of fatigue crack growth in IS-1020 steel under constant amplitude loading(Elsiever, 1993) Singh, Shamsher BahadurCrack 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 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 . A crack growth rate equation was also developed.