Damage evolution in the AMg6 alloy during high and very high cycle fatigue

Paper presents the “in situ” method for determining of irreversible fatigue damage accumulation, based on the analysis of nonlinear manifestations of the feedback signal in a closed system of an ultrasonic fatigue system. During very high cycle (gigacycle) fatigue, the anomalies of the elastic prope...

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Veröffentlicht in:Frattura ed integritá strutturale 2019-07, Vol.13 (49), p.383-395
Hauptverfasser: Bannikov, Mikhail, Bilalov, Dmitry, Oborin, Vladimir, Naimark, Oleg
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Bilalov, Dmitry
Oborin, Vladimir
Naimark, Oleg
description Paper presents the “in situ” method for determining of irreversible fatigue damage accumulation, based on the analysis of nonlinear manifestations of the feedback signal in a closed system of an ultrasonic fatigue system. During very high cycle (gigacycle) fatigue, the anomalies of the elastic properties of the material are appear, which leads to a nonlinearity effect in the amplitude of oscillations. This effect increases with the initiation and growth of fatigue cracks. The technology was applied to samples of AMG-6 alloy with preliminary dynamic deformation at various levels of average stress to determine the moment of initiation and growth of the fatigue crack in very high cycle fatigue regime. This method is applicable for the early detection of fatigue cracks both on the surface and inside the material under cyclic loading in the ultrasonic mode. On the basis of wide-range defining relations for a deformable solid body with mesoscopic defects, a mathematical model has been proposed that can adequately describe behavior of the material during fatigue failure. The results of mathematical modeling are in good agreement with the experimental data
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identifier ISSN: 1971-8993
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1971-8993
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subjects Aluminum base alloys
Anomalies
Crack initiation
Crack propagation
Cyclic loads
Damage accumulation
Deformation
Elastic properties
Fatigue
Fatigue cracks
Fatigue failure
Flaw detection
Formability
Fracture mechanics
High cycle fatigue
Mathematical analysis
Mathematical models
Nonlinear analysis
Nonlinear systems
Nonlinearity
Oscillations
title Damage evolution in the AMg6 alloy during high and very high cycle fatigue
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