Flexural fatigue strengths of riveted box beams - Alclad 14S-T6, Alclad 75S-T6, and various tempers of Alclad 24S

Note presenting flexural fatigue tests made on riveted box beams of 14S-T6, 75S-T6, and various tempers of 24S alclad aluminum-alloy sheet in order to gain new knowledge of the fatigue strength of built-up structures. Of the five alloy-temper combinations studied in riveted box-beam sections, the flexural fatigue strengths were found to lie in a rather narrow band and no one combination was found to have higher strength values than all others for the entire range of fatigue life covered in these tests.