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Benefits of metal foams and developments in modelling techniques to assess their materials behaviour: a review
Ist Teil von
Materials science and technology, 2012-02, Vol.28 (2), p.129-143
Ort / Verlag
London, England: Taylor & Francis
Erscheinungsjahr
2012
Link zum Volltext
Quelle
Taylor & Francis
Beschreibungen/Notizen
A review assessing the relative benefits of metal foam core sandwich panels
with respect to honeycomb, polymeric foam and truss cores has been conducted.
It is noted that metal foams are able to combine low density with good bending
stiffness and strength, making them attractive core materials for use in industrial
applications (e.g. aircraft wing structures). The current modelling
tools available for metal foams are also reviewed. These fall under three
categories: analytical methods using dimensional analysis, finite element
methods utilising a repeating unit cell, and finite element methods utilising
the random Voronoi technique. It is noted that analytical methods do not take
into account the effect of imperfections in the microstructure. Finite element
methods utilising a repeating unit cell also fail to capture the natural variations
in microstructure that are observed in most cellular materials. The effects
of imperfections are discussed, and it is observed that these reduce the hydrostatic
strength of foams by differing amounts. The Voronoi technique can produce
a geometrically more realistic model of the foam structure than the other
two methods. Finite element methods are also being developed that utilise
a three-dimensional tomographic image of a real foam as the geometric description
of the model and it is possibly here that the most exciting developments for
the modelling of foams resides.