Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 7: Transport and Diffusion II
MM 7.6: Vortrag
Montag, 26. März 2012, 12:45–13:00, H 1029
Mechanical Metamaterials — •Tiemo Bückmann1, Nicolas Stenger1, Michael Thiel2, Christoph Eberl3, Tobias Kennerknecht3, and Martin Wegener1,2,4 — 1Institut für Angewandte Physik and DFG-Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology(KIT), 76131 Karlsruhe, Germany — 2Nanoscribe GmbH, 76344 Eggenstein-Leopoldshafen, Germany — 3Institute for Applied Materials, Karlsruhe Institute of Technology(KIT), 76344 Eggenstein-Leopoldshafen, Germany — 4Institut für Nanotechnologie (INT), Karlsruhe Institute of Technology(KIT),76344 Eggenstein-Leopoldshafen, Germany
Auxetic materials attract attention due to their mechanical properties for over 100 years. These advanced materials with negative Poisson's ratio have recently gained special interest. State-of-the-art fabrication techniques allow for greater design freedom and systematic investigation.We consider the characteristics and the design of structured polymeric materials with the aim to create three-dimensional (3D) mechanical metamaterials with negative Poisson's ratios. 3D models of different structures are simulated with finite-element methods using the software package Comsol Multiphysics. Samples of relevant geometries with sizes between tens of micrometers and 0.3 millimeters are fabricated using direct laser writing (DLW). Arbitrary 3D manufacturing offered by DLW allows for tuning the Poisson's ratio of the material. The fabricated mechanical metamaterials are well structured, show a high degree of translational symmetry, and maintain fidelity to the blueprint over the extent of the entire structure.