✦ LIBER ✦

The effect of sheet thickness on fatigue crack retardation in 2024-T3 aluminum alloy

✍ Scribed by W.J. Mills; R.W. Hertzberg

Publisher: Elsevier Science
Year: 1975
Tongue: English
Weight: 794 KB
Volume: 7
Category: Article
ISSN: 0013-7944
DOI: 10.1016/0013-7944(75)90026-0

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✦ Synopsis

Variable-amplitude fat@ue studies of 2024-13 ab&num alloy were performed to examine the effect of sheet thickness on fatigue crack growth rate retardation. Results indicated tbat the amouot of retardation increased with decreasing specimen thickness. This phenomenon was attrii to enhanced plastic strains under plane stress conditions (i.e. in a tbin sheet) which formed abead of the advanchy crack tip as a result of a hi,@ load excursioo. These strains are believed to produce both crack closure and a favorable compressive residual stress field around the crack tip. Evidence of increased crack surface interference under plane stress situations was vcri&d with electron fractograpbic observations.

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