Fracture Toughness, Fatigue and Corrosion Characteristics of High Strength Aluminum Extrusions and Plate.
Abstract
The fracture toughness data was analyzed to indicate the effects of specimen direction, location, orientation, and of product and product thickness, on fracture toughness. Axial-stress fatigue curves have been prepared for smooth specimens from the 7075-T6510, 7075-T73510, X7080-T7E42 and 7178-T6510 extruded bars; the fatigue properties varied with direction in the same order as the tensile properties. The resistance to exfoliation attack and to stress-corrosion cracking of the T7-type tempers is consistently higher than that of the T6-type tempers, for the alloy-temper combinations which are being tested in this program. Tests to evaluate the stress-corrosion resistance of the extruded bar samples by a fracture mechanics approach are underway; some test results of specimens from the 7075-T6510 and 7075-T73510 extruded bars are reported. Fatigue crack propagation curves are presented for the 7075-T6510, 7075-T73510 and X7080-T7E42 extruded bars and extruded panels, and for the X7080-T7E41 plates. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1968
- Accession Number
- AD0863770
Entities
People
- B. W. Lifka
- Glenn E. Nordmark
- J. G. Kaufman
- J. W. Coursen
- P. E. Schilling
Organizations
- Alcoa