DESIGN MECHANICAL PROPERTIES, FRACTURE TOUGHNESS, FATIGUE PROPERTIES, EXFOLIATION AND STRESS-CORROSION RESISTANCE OF 7050 SHEET, PLATE, HAND FORGINGS, DIE FORGINGS AND EXTRUSIONS

The mechanical properties, including fracture toughness and fatigue, fatigue-crack growth rates and corrosion characteristics have been determined for a total of 51 lots of 7050-T76 sheet, 7050-T73651 plate, 7050-T73652 hand forgings, 7050-T736 die forgings and 7050-T76511 extruded shapes. Tables of computed design mechanical properties, modulus of elasticity values and individual stress-strain curves are presented. The critical stress-intensity factor, (K sub c), was determined for samples of each lot of sheet and the plane-strain stress-intensity factor, (K sub Ic), was determined for plate, hand and die forgings and extruded shapes. The combination of strength and toughness of all products are generally comparable to or higher than those of conventional 7XXX alloys. Axial-stress fatigue strengths were determined in ambient-air and salt-fog environments. Modified Goodman diagrams were developed from tests made in ambient air.
See also report dated Apr 1973, AD-766 335.