FATIGUE AND NOTCH BEND PROPERTIES OF HIGH-STRENGTH ALUMINUM ALLOYS.
Research and development rept.
NAVAL ENGINEERING EXPERIMENT STATION ANNAPOLIS MD
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An investigation was made of the mechanical properties of high-strength, structural aluminum alloys produced in heavy sections. Although tensile strengths of the alloys ranged from 40,000 to 75,000 psi, little difference in fatigue and corrosion fatigue properties was found among alloys on the basis of a 10,000,000 cycle life. Tests run to 100,000,000 cycles indicated some superiority for the lower strength alloys of the group. Notch bend tests, with specimens up to 3 in. sq, were conducted with alloys 5456-H321, 6061-T6, and 7079-T6 as a means of evaluating notch behavior and susceptibility to brittle fracture. The results demonstrated a marked decrease in fracture stress under conditions causing brittle fracture in alloy 7079. It is concluded that the notch bend tests, correlated with energy release rate concepts of brittle fracture propagation, offer a better approach to the study of notch behavior in these alloys than the more conventional impact tests. Author
- Properties of Metals and Alloys