Abstract
The purpose of this research was to compare the resistance to the onset of multi-site damage in thin 2024-T3 and 2524-T3 sheet. Aluminum alloy 2524-T3 is a relatively new fuselage skin sheet material that may offer improved performance with respect to the onset of multi-site damage. The alloys were compared on the basis of crack size frequency distributions measured from multi-hole specimens with and without prior corrosion subjected to cyclic loading. The crack size distributions for the pristine bare and alclad sheet showed no significant difference between 2024-T3 and 2524-T3. When prior corrosion is present, however, thin, bare 2524-T3 offers improved resistance to the onset of multi-site damage.
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