Mechanical Properties, Including Fracture Toughness and Fatigue, Corrosion Characteristics and Fatigue-Crack Propagation Rates of Stress-Relieved Aluminum Alloy Hand Forgings

Except for a few tests, the tensile, compressive, shear and bearing properties were determined for all but three of a total of forty 2014-T652, 2024-T852, 7075-T7352 and 7079-T652 hand forgings scheduled for test. Ratios among these properties were calculated. Plane-strain fracture-toughness values were determimed for two of the hand forgings. The results of axial-stress fatigue tests (R = 0.0) of smooth specimens are presented. The preparation of specimens for the stress-corrosion and exfoliation tests was initiated. Tests of the 6x24-in. 2014-T652 hand forging are in progress to study the effects of notch geometry, specimen length and stress on the rate of fatigue crack propagation.