Mechanical Properties, Including Fracture Toughness and Fatigue, Corrosion Characteristics and Fatigue-Crack Propagation Rates of Stress-Relieved Aluminum Alloy Hand Forgings
Technical Management rept. no. 4, 15 Nov 1968-15 Feb 1969
ALUMINUM CO OF AMERICA ALCOA CENTER PA ALCOA LABS
Pagination or Media Count:
All forty of the hand forgings scheduled for test have been received chemical analyses have been made and most of the tensile, compressive, shear and bearing properties have been determined. The results of axial-stress fatigue tests of smooth specimens are reported. The results of some tests to determine the effects of notch geometry on the rate of fatigue-crack propagation are presented. Additional tests are being initiated to determine if the uniformity of crack initiation can be improved by using a different notch and crack initiation procedure. Tests are in progress to determine whether it is feasible to change the load during a test to obtain crack-propagation rates at more than one stress level.
- Properties of Metals and Alloys
- Fabrication Metallurgy