Information Technology Reference
In-Depth Information
Chapter 10
In Situ Investigation and Image-Based
Modelling of Aluminium Foam
Compression Using Micro X-Ray
Computed Tomography
Y. L. Sun, T. Lowe, S. A. McDonald, Q. M. Li and P. J. Withers
Abstract Our understanding of the compressive behaviour of foams can be
improved by combining micro X-ray computed tomography (CT) and finite ele-
ment modelling based on realistic image-based geometries. In this study, the cell
structure of an aluminium foam (Alporas TM ) specimen and its deformation during
continuous low-strain-rate compressive loading are recorded by 'fast' CT imaging.
The original 3D meso-structure is used to construct a 3D finite element model
(FEM) for simulation. It is observed that local collapse can occur in cells with a
wide variety of shapes and sizes, and the compressive strength is determined by
the formation and development of the localised deformation bands. The FE pre-
diction of the stress-strain relationship and cell deformation process has reason-
able agreement with the experimental observation, especially for the cell-wall
collapse corresponding to the plateau in the stress-strain curve. The simulation
also indicates that local yielding actually occurs in cell walls well before the
plateau regime. The experimental and image-based modelling methods demon-
strated here for foams have potential across a very wide range of applications.
List of Abbreviations
CT
Computed tomography
FEM
Finite element models
 
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