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An evaluation of ΔKeff estimation procedures on 6061-T6 and 2024-T3 aluminum alloys

✍ Scribed by Keith Donald; Paul C. Paris

Book ID: 104288838
Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 578 KB
Volume: 21
Category: Article
ISSN: 0142-1123
DOI: 10.1016/s0142-1123(99)00055-9

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✦ Synopsis

Experimental and analytical evidence indicates that 'closure' or interference of crack faces does not entirely isolate the crack tip from damaging strains due to cyclic loading. Therefore, an estimation of the effective stress intensity range at the crack tip, ⌬K eff , should take into account the additional cyclic crack tip strain below the opening load. In this investigation, the estimation of ⌬K eff is based on the traditional opening load method and also on numerous new methods that show improved correlation of fatigue crack growth rate stress ratio effects in general but mostly at near-threshold growth rates. The experimental results of this study also indicate that the fatigue crack growth rate is not determined solely by ⌬K eff but also depends on K max . A procedure for determining an intrinsic crack growth rate curve is described.

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