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

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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

Author(s):
Schilling, P. E. ; Lifka, B. W. ; Coursen, J. W. ; Nordmark, G. E. ; Kaufman, J. G.
Author Organization(s):
ALUMINUM CO OF AMERICA ALCOA CENTER PA ALCOA LABS
Descriptive Note:
Quarterly technical management rept. no. 6, 27 Jun-27 Sep 68,
Supplementary Note:
See also Quarterly technical management rept. no. 5, AD-840 349.
Pagination:
0090

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Contract/Grant Number(s):
F33615-67-C-1521
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*ALUMINUM ALLOYS, MECHANICAL PROPERTIES), (*CORROSION, ALUMINUM ALLOYS), METAL PLATES, EXTRUSION, PANELS, TOUGHNESS, FATIGUE(MECHANICS), FRACTURE(MECHANICS), STRESS CORROSION, CRACK PROPAGATION
Field(s)/Group(s):
Properties of Metals and Alloys, Mechanics
Keyword(s):
ALUMINUM ALLOY 7178, ALUMINUM ALLOY 7080, ALUMINUM ALLOY 7075
Report Date:
1968 Jan 01