Metal Foams and Porous Metal Structures (Eds. J.Banhart, M.F.Ashby, N.A.Fleck), pp. 283-288, 1999
T. Daxner, H.J. Böhm, F.G. Rammerstorfer
Institute of Lightweight Structures and Aerospace
TU Wien, Vienna, Austria
Metallic foams can be compacted at a relatively constant stress level which
qualifies them for energy absorption applications.
Their mechanical behaviour is influenced by imperfections caused by the
Spatial variations in the cell size distribution and imperfect cell wall
geometries are studied as examples for such imperfections.
Using 2D finite element unit cell models the interaction of different model
topologies and cell wall deformations is examined.
The topologies include hexagonal cell arrangements, big cells surrounding
clusters of small cells and "rings" of small cells surrounding big cells.
Imperfections on the cell wall level comprise sinusoidal wiggles and
curved cell walls.