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Title: Detailed analysis of closed-cell aluminum alloy foam internal structure changes during compressive deformation
Author: Ulbin, Miran
Vesenjak, Matej
Borovinšek, Matej
Duarte, Isabel
Higa, Yoshikazu
Shimojima, Ken
Ren, Zoran
Keywords: Closed‐cell aluminum alloy foam
Image analysis
Micro computed tomography
Pore distribution
Pore orientation
Issue Date: Aug-2018
Publisher: Wiley
Abstract: This paper proposes the new methodology for geometrical properties identification of step‐wise deformed closed‐cell aluminum alloy foam. The change of internal structure of cylindrical foam specimens during deformation is ex situ recorded by a micro computed tomography scanner. The geometry of five specimens is analyzed in un‐deformed and several deformed states until 70% of engineering strain. The obtained CT images is used to construct the 3D computer models of un‐deformed/deformed foam specimens. These are then subjected to an automated analysis of the geometrical properties of internal structure to determine the size, distribution, and orientation of the pores. The results provide the basis for further analysis of the variation in internal structure during the deformation process. The internal structure of un‐deformed specimens exhibits a pore orientation dependent on the fabrication process. Significant changes of internal pore structure is observed during the deformation process, where the specimens with small spatial variation of porosity sustains larger strains until failure under compressive load. The specimens with larger spatial variation of porosity and larger pore concentrations disintegrate earlier.
Peer review: yes
DOI: 10.1002/adem.201800164
ISSN: 1438-1656
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Appears in Collections:DEM - Artigos

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