Journal
ACTA MATERIALIA
Volume 61, Issue 7, Pages 2571-2582Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2013.01.035
Keywords
Crack propagation; AA6061 aluminum alloy; In situ laminography; Micromechanical modeling; Ductile fracture
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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. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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