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MATERIAL - 7079-T651 ALUMINUM ALLOY - FATIGUE PROPERTIES - DETERMINATION OF
GENERAL DYNAMICS/FORT WORTH TEX
Pagination or Media Count:
Four fatigue specimens were prepared representing each of 3 bulkhead configurations used on the B-58. The bulkhead sections tested consisted of an extrusion of 7075-T6 Al alloy numbered E-702402, and 2 sections of different flange thickness of 7079-T651 Al alloy machined from 4-12 in thick plate purchased to FMS-0108 specification. All 12 bulkhead specimens were attached to load plates that represente typical installation a d ests for fatigue spectrum. All specimens were subjected to the 20 layers of spectrum load twice without failure. The specimens were then tested at the fourth highest load of the spectrum to failure. The extrusion averaged 270,000 a ditional cycles, the thin flanged plate specimen averaged 299,000 additional cycles, and the thick flanged plate specimen averaged 563,000 additional cycles. Author
APPROVED FOR PUBLIC RELEASE