Accession Number:

AD0272258

Title:

MATERIAL - 7079-T651 ALUMINUM ALLOY - FATIGUE PROPERTIES - DETERMINATION OF

Descriptive Note:

Corporate Author:

GENERAL DYNAMICS/FORT WORTH TEX

Personal Author(s):

• GHENA,P.F.

Report Date:

1962-01-16

Pagination or Media Count:

1.0

Abstract:

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

Descriptors:

• *ALUMINUM ALLOYS
• AIRFRAMES
• ALLOYS
• EXTRUSION
• FAILURE(MECHANICS)
• FATIGUE(MECHANICS)
• LOAD DISTRIBUTION
• METAL JOINTS
• METAL PLATES

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE