Article : [ART155]

Info : REPONSE 3, le 04/02/2002.

Titre : Analysis of fatigue crack propagation by quantitative fractography.

Cité dans : [DIV313]  Recherche sur l'auteur Narayanaswani RANGANATHAN, février 2002.

Source : ASTM Special Technical Publication n 1402 2001.p 52-84
CODEN : ASTTA8
ISSN : 1040-3094
Année : 2001
Document_Type : Journal
Treatment_Code : Theoretical; Experimental
Language : English
Stockage :

Abstract :
Based on constant amplitude fatigue tests on 12 mm thick plates, in a 2024 T351 aluminum alloy, a previous
study has shown that the spatial distribution of predominant facies reflects the effects of stress intensity factor
and the load ratio. In this paper, this technique is applied to constant amplitude crack propagation tests to thin
plates of the same material, and it is shown that the quantitative fracture surface analysis method developed
permits to distinguish the effects of fracture mechanics parameters. Results obtained under variable amplitude
tests are then analyzed. The fracture surface analysis permits the identification of a change in fracture mode
and accurate life evaluation can then be made after taking into account the observed change. In the case of an
aluminum lithium alloy this method cannot be directly applied due to changes in fracture mechanisms under
variable amplitude loading. But an analysis is carried out by taking into account associated changes in crack
closure levels, which leads to excellent life predictions under variable amplitude test conditions. 27 Refs.

Accession_Number : 2001(40):1070 COMPENDEX

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