Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung
After their development approximately 30 years ago, aluminium foams like Foaminal or aluminium foam sandwich (AFS) have found their way into industrial production. However, the application range is still limited. This is partly due to the specific property spectrum of foams; however, the main reason can be attributed to their relatively high production costs. These are caused by expensive raw materials and the complicated foaming process. In order to evade the latter, the advanced pore morphology (APM) foam was developed; which comprises the simple foaming of small foam elements, which are subsequently combined to larger components or foam fillings by means of polymer bonding. As the high raw material costs are still an issue, the present investigation focused on small quasi-porous elements made from aluminium sheet as alternative basis for the APM foams. Aluminium Raschig rings – known from random column packing in chemistry – were used in different sizes and combinations for the experiments. Bonding of the rings to obtain larger specimens was performed with cold-curing epoxy adhesive and thermoplastic polyamide. Quasi-static compression tests according to DIN 50134 were used for the determination of the mechanical properties. Results showed that the non-isotropic behavior of simple Raschig rings leads to non-optimal use of the deployed material in the foam for the absorption of deformation energy. Using combinations of Raschig rings, the non-isotropy can be weakened and the material efficiency can be increased.
Abstract
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