Accession Number:

AD0600375

Title:

AN INVESTIGATION OF LOW-CYCLE FATIGUE FAILURES USING APPLIED FRACTURE MECHANICS

Descriptive Note:

Technical documentary rept. 15 Feb 1963-15 Feb 1964

Corporate Author:

BOEING CO SEATTLE WA

Personal Author(s):

• Tiffany, C. F.
• Lorenz, P. M.

Report Date:

1964-05-01

Pagination or Media Count:

106.0

Abstract:

Basic principles of fracture mechanics were applied to the investigation of cyclic flaw growth characteristics of Ladish D6A-C steel, tested at room temperature 6Al-4V titanium, tested at -320 F and 18Ni300 maraging steel, tested at room temperature using uniaxially loaded, preflawed fatigue cracked test specimens. Applicability of such data to prediction of the cyclic life span of biaxially loaded pressure vessels has been verified by testing six 17-inchdiameter, preflawed Ladish D6A-C test tanks. A brief discussion of technical background illustrates the experimental approach and the significance of resulting test data. A method for utilization of NDT inspection and proof-pressure testing in conjunction with the cyclic flaw growth data for design purposes is also presented.

Descriptors:

• *STEEL
• *FRACTURE(MECHANICS)
• *MARAGING STEELS
• *TITANIUM ALLOYS
• MECHANICAL PROPERTIES
• EXPERIMENTAL DATA
• PRESSURE VESSELS
• VANADIUM ALLOYS
• NICKEL ALLOYS
• METAL PLATES
• FRACTOGRAPHY
• LIFE EXPECTANCY(SERVICE LIFE)
• ALUMINUM ALLOYS

Subject Categories:

• Metallurgy and Metallography
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE