✦ LIBER ✦

Influence of multiple overload on fatigue crack retardation in high strength low alloy structural steel

✍ Scribed by Subrato Dhar

Publisher: Elsevier Science
Year: 1988
Tongue: English
Weight: 595 KB
Volume: 31
Category: Article
ISSN: 0013-7944
DOI: 10.1016/0013-7944(88)90094-x

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✦ Synopsis

The influence of multiple overload at various stress intensity levels (AK) in the linear regime of Paris plot was studied in high strength low alloy structural steel SANH-55. It was observed that crack retardation increases by increasing the overload ratio and the number of overloads. Saturation effect was observed for overload peak ratio lower than 1.8 and crack arrest for overload peak ratio greater than 2.3. An attempt is also made in explaining the crack acceleration and retardation process by using crack closure model proposed by Newman. The increase in S/N life due to crack closure effect of multiple overloads, for fail safe damage tolerant design is also discussed.

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