A STUDY OF FATIGUE CRACK GROWTH 5052 ALUMINUM-ALLOY UNDER CONSTANT-AMPLITUDE LOADING

摘要

Crack propagation experiments were performed on 5052 aluminum alloy 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 ΔK_(eff) as a function of stress ratio R. The data covered R values of 0.0, 0.2, 0.3, 0.4 and 0.5, and a good relation was obtained for U = 0.50 + 0.35R + 0.35R~2. A crack growth rate equation was also developed i. e. da/dN = 5.4096×10~(-11) (UΔK)~(5.0236).