EFFECT OF OPEN CIRCULAR HOLES ON TENSILE STRENGTH AND ELONGATION OF SHEET SPECIMENS OF SOME ALUMINUM ALLOYS

摘要

Teats were made to determine the relative effect of various patterns of open circular holes on the tensile strength and elongationnof 24S-T3 (24S-T),1 24S-T8l, 24S-T86, 24S-0, Alclad 75S-T6 (Alclad 75S-T),i Alclad 14S-T6 (Alclad 14S-T),1 and Alclad 14S-T3 (Alclad I4S-W)I aluminum-alloy sheet specimens having a ratio of hole diameter to thickness of sheet of 3.nIn practical cases, the reduction in strength resulting from open circular holes in sheet subjected to tension will not exceed about 5 percent for Alclad 14S-T6, Alclad 75S-T6, 24S-T8l, and 24S-T86. In the case of 24S-T3 24S-O and Alclad l4S-T3, however, strength reductions may be slightly greater than 10 percent.