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Three-dimensional quantitative in situ study of crack initiation and propagation in AA6061 aluminum alloy sheets via synchrotron laminography and finite-element simulations

Abstract : Ductile crack initiation and propagation in AA6061 aluminum alloy for a fatigue precrack have been studied in situ via synchrotron radiation computed laminography, a technique specifically developed for three-dimensional imaging of laterally extended sheet specimens with micrometer resolution. The influence of the microstructure, i.e. due to the presence of coarse Mg2Si precipitates and iron-rich intermetallics, on the void nucleation process is investigated. Coarse Mg2Si precipitates are found to play a preponderant role in the void nucleation and ductile fracture process. Void growth and void coalescence are then observed and quantified by three-dimensional image analysis during crack initiation and propagation. Parameters for a Gurson-Tvergaard-Needleman micromechanical damage model are identified experimentally and validated by finite-element simulations.
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Submitted on : Friday, April 19, 2013 - 9:57:42 AM
Last modification on : Wednesday, November 17, 2021 - 12:28:04 PM

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Yang Shen, Thilo F. Morgeneyer, Jérome Garnier, Lucien Allais, Lukas Helfen, et al.. Three-dimensional quantitative in situ study of crack initiation and propagation in AA6061 aluminum alloy sheets via synchrotron laminography and finite-element simulations. Acta Materialia, Elsevier, 2013, 61, pp.2571-2582. ⟨10.1016/j.actamat.2013.01.035⟩. ⟨hal-00815629⟩

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