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Temperature Dependence of Fatigue Crack Propagation in an Al-2.6Mg Alloy Pages: 10 Published: Jan 1973
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View License Agreement Source: STP520-EB Abstract Fatigue crack propagation has been studied in an Al-2.6Mg alloy between room temperature and 300 C. It is shown that the fatigue crack propagation rate is controlled by volume diffusion. The activation barrier for volume diffusion (Q0) is lowered by the applied stress intensity range ΔK so that Q(ΔK) = Q0 - C1 log ΔK. The driving force for the process is inversely proportional to the square of the stress intensity range: A(ΔK) = C2 ΔK-2. Fatigue crack propagation rate as a function of temperature and stress intensity range is given by Keywords: fatigue (materials), crack propagation, aluminum alloys, stresses, thermal fatigue, cyclic strain, activation energy Paper ID: STP38835S Committee/Subcommittee: E08.05 DOI: 10.1520/STP38835S ASTM International is a member of CrossRef. | ||