Article : [ART159]

Info : REPONSE 16, le 04/02/2002.

Titre : Analysis of fatigue crack growth in terms of crack closure and energy.

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

Meeting : Proceedings of the 1997 2nd Symposium on Advances in Fatigue Crack Closure Measurement and Analysis.
Location : San Diego, CA, USA
Date : 12 Nov 1997-13 Nov 1997

Meeting : Proceedings of the 1997 2nd Symposium on Advances in Fatigue Crack Closure Measurement and Analysis.

Info : organization : ASTM
Location : San Diego, CA, USA
Date : 12 Nov 1997-13 Nov 1997

Source : ASTM Special Technical Publication n 1343 1999.p 14-38
CODEN : ASTTA8
ISSN : 1040-3094
Année : 1999
Meeting_Number : 55920
Document_Type : Journal
Treatment_Code : Theoretical
Language : English
Stockage :

Abstract :
The fatigue crack growth behavior of the aluminum alloy 2024 is analyzed using the crack closure and an
energy-based concept.The different test conditions studied include load ratio and environmental effects, crack
growth retardation following a single overload, and crack propagation under block load tests.Crack opening
loads using the compliance technique permit the effect of load ratio to be taken into account.After an
overload, in the deceleration phase, the evolution of the crack opening load is not compatible with that of the
crack growth rate.The measured crack opening levels under constant-amplitude loading conditions are
comparable to those predicted under plane strain conditions for moderate Delta K levels.It is shown that most
of the effects usually attributed to closure can be successfully explained using energy concepts.In particular, it
is shown that there exists a linear relationship between the crack growth rate and the energy dissipated per
cycle at high growth rates, which is valid for both the environments studied, and it corresponds to a crack
growth mechanism characterized by striation formation during each cycle. For lower growth rates a power
law relationship can be proposed between these two parameters.The above-mentioned linear relationship
holds also for the block loading conditions based on total energy dissipated per block.Certain experimental
facts bring out the effect of closure on the energy dissipated.It is further shown that the possible existence of a
mixed (Mode I and Mode II) mode crack opening at the crack tip has to be taken into account to correctly
evaluate the energy dissipated near the crack tip. (Author abstract) 36 Refs.

Accession_Number : 2000(2):2292 COMPENDEX

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