AN INVESTIGATION OF LOW-CYCLE FATIGUE FAILURES USING APPLIED FRACTURE MECHANICS
- 1 May 1964
- report
- Published by Defense Technical Information Center (DTIC)
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 18Ni(300) 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.Keywords
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