Anisotropic ductile fracture of Al 2024 alloys |
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Authors: | Dirk Steglich Wolfgang Brocks Thomas Pardoen |
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Affiliation: | a GKSS Research Centre, Institute for Materials Research, Materials Mechanics, D-21502 Geesthacht, Germany b Department of Materials Sciences and Processes, Université catholique de Louvain, IMAP, Place Sainte Barbe 2, B-1348 Louvain-la-Neuve, Belgium |
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Abstract: | The anisotropic fracture of the 2024-T351 aluminium alloy is investigated using a micromechanics-based damage model accounting for the effect of the void aspect ratio and void distribution. The 2024-T351 Al alloy contains precipitation free bands in which most void nucleating particles are located. The presence of these bands, which are parallel to the rolling direction, primarily controls the distribution of damage and overall fracture anisotropy. The primary void nucleating particles also present a preferential elongation in the rolling direction. These key microstructural features have been determined using quantitative characterisation methods. The effects of void shape and void spacing on the fracture behaviour are elucidated by means of FE cell calculations. FE simulations of cylindrical notched round bars loaded in different orientations are made and compared with experimental data, allowing a better understanding of the damage process as well as the limitations of the modelling approach. |
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Keywords: | Metals Micromechanics Ductile fracture Void growth Aluminium Anisotropic damage |
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