Berlin 2015 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 54: Biomaterials and Biological Materials IV
MM 54.5: Vortrag
Donnerstag, 19. März 2015, 12:45–13:00, TC 006
Natural crash protection: pomelo peels as inspiration for metal foams with improved impact resistance — •Paul Schueler1, Sebastian Fischer2, Marc Thielen3, Thomas Speck3, Andreas Bührig-Polaczek2, and Claudia Fleck1 — 1Materials Engineering, Institute of Technology, Berlin, Germany — 2Foundry Institute, RWTH, Aachen, Germany — 3Plant Biomechanics, University Freiburg, Freiburg, Germany
In biology, structuring often leads to enhanced properties. Inspired by the pomelo peel that exhibits an impact energy dissipation of over 90 % we develop metal based foam structures. Examples for transferred structural principles are sandwich arrangements of foam layers with varying cell sizes that greatly reduce scatter of the strength values, and fibre reinforcements of the foams that locally stabilise cells by redistributing the load. On a lower hierarchical level, we evaluate the influence of strut microstructure and of the strut and cell geometry. We combine mechanical testing with different imaging techniques: video recordings allow us to evaluate the foams' macroscopic failure mechanisms during low- and high-speed compression tests, while in situ testing in the SEM or lab/synchrotron micro-CT gives 2D/3D-information on deformation and crack development on the microscale, on cells or single struts deformed to defined strain values. We now better understand the deformation mechanisms of the bio-inspired foam structures at different hierarchical levels as well as the influence and interactions of the single hierarchical levels.