The rate of fatigue-crack propagation in two aluminum alloys

Arthur J. Mcevily, Jr., Walter Illg
naca-tn-4394
SEP 1958


A general method has been developed for the determination of fatigue-crack propagation rates. In order to provide a check on the theoretical predictions and to evaluate certain empirical constants appearing in the expression for the rate of fatigue-crack propagation, an extensive series of tests has been conducted. Sheet specimens, 2 inches and 12 inches wide, of 2024-T3 and 7075-T6 aluminum alloys were tested in repeated tension with constant-amplitude loading. Stresses ranged up to 50 ksi, based on the initial area. Good agreement between the results and predictions was found.

An Adobe Acrobat (PDF) file of the entire report:
http://naca.central.cranfield.ac.uk/reports/1958/naca-tn-4394.pdf