Accession Number : AD0863770

Title :   Fracture Toughness, Fatigue and Corrosion Characteristics of High Strength Aluminum Extrusions and Plate.

Descriptive Note : Quarterly technical management rept. no. 6, 27 Jun-27 Sep 68,

Corporate Author : ALUMINUM CO OF AMERICA ALCOA CENTER PA ALCOA LABS

Personal Author(s) : Schilling, P. E. ; Lifka, B. W. ; Coursen, J. W. ; Nordmark, G. E. ; Kaufman, J. G.

Report Date : 1968

Pagination or Media Count : 90

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)

Descriptors :   (*ALUMINUM ALLOYS, MECHANICAL PROPERTIES), (*CORROSION, ALUMINUM ALLOYS), METAL PLATES, EXTRUSION, PANELS, TOUGHNESS, FATIGUE(MECHANICS), FRACTURE(MECHANICS), STRESS CORROSION, CRACK PROPAGATION.

Subject Categories : Properties of Metals and Alloys
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE