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07503 Fatigue and Corrosion Fatigue in Short-Transverse Direction of 2024-T351 Plates Containing Localized Corrosion Defects

Product Number: 51300-07503-SG
ISBN: 07503 2007 CP
Author: Nathalie Pauze, Dome Tanguy, David Delafosse, Jerome Delafosse, and Dominique Schuster
Publication Date: 2007
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The early stages of fatigue and corrosion fatigue from pre-corroded 2024-T351 aluminium alloy are investigated. Pre-corrosion is obtained by immersion in an aerated, pH = 7, 0.5 M sodium chloride (NaCI) solution at free potential. Such exposures result in the formation of shallow semi-elliptical defects in the 0.1 mm depth range with highly non-linear growth kinetic: after a few hours, the growth kinetic is seen to drop by over an order of magnitude. Fatigue crack propagation from these narrow corrosion defects is studied, particularly the transition between intergranular corrosion and transgranular short fatigue crack. At each stage, the crack growth rate and AK are estimated and the fracture mode is characterised.
The early stages of fatigue and corrosion fatigue from pre-corroded 2024-T351 aluminium alloy are investigated. Pre-corrosion is obtained by immersion in an aerated, pH = 7, 0.5 M sodium chloride (NaCI) solution at free potential. Such exposures result in the formation of shallow semi-elliptical defects in the 0.1 mm depth range with highly non-linear growth kinetic: after a few hours, the growth kinetic is seen to drop by over an order of magnitude. Fatigue crack propagation from these narrow corrosion defects is studied, particularly the transition between intergranular corrosion and transgranular short fatigue crack. At each stage, the crack growth rate and AK are estimated and the fracture mode is characterised.
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