FATIGUE BEHAVIOR OF 2014-T6, 7075-T6 AND 7079-T6 ALUMINUM ALLOY REGULAR HAND FORGINGS

摘要

This report presents the test procedures and results of a fatigue investigation on regular hand forgings of the aluminum alloys 2014-T6, 7075-T6 and 7079-T6. The effects of forging direction on fatigue strength are investigated in the unnotched and notched condition.nThe unnotched fatigue strength of the three alloys ranged from 20,000 to 25,000 psl at 2 x 107 cycles, with the 7079-T6 alloy being slightly lower than 7075-T6 and about the same as that of the 2014-T6 alloy.nThe fatigue strength in the short transverse direction is consistently lower than in the longitudinal direction; however, the difference becomes less in the notched condition.