Development of nanostructures for the creation of mechanical metamaterials

© Fraunhofer IWM

In order to design the mechanical properties of metamaterials, we employ three-dimensional nanolithography. In our application, framework structures with a minimal thickness of 100 nm are polymerized out of a photoresist by a femtosecond laser. The unit cells of these structures are constructed so that they show a desired mechanical property when coupled in a large matrix. The structure shown below is extremely stiff when considering its weight. Its design is for the mechanical stabilization of other components, which could be given a metallic coating and used in strain sensors.

Publications

 

  • Lichti, T.; Andrä, H.; Leichner, A.; Müller, R.; Wenz, F., Optimal design of unit-cell based programmable materials, PAMM 20/1 Special Issue: 91th Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM); Kuhl, D.; Mesiter, A.; Ricoeur, A.; Wünsch, O. (Eds.); John Wiley & Sons, Inc., Hoboken, NJ, USA (2021) e202000010, 2 Seiten Link
  • Schönfeld, D.; Chalissery, D.; Wenz, F.; Specht, M.; Eberl, C.; Pretsch, T., Actuating shape memory polymer for thermoresponsive soft robotic gripper and programmable materials, Molecules 26/3 (2021) Art. 522, 20 S. Link
  • Fischer, S.C.L.; Hillen, L.; Eberl, C., Mechanical metamaterials on the way from laboratory scale to industrial applications: Challenges for characterization and scalability, Materials 13/16 (2020) Art. 3605, 16 Seiten Link
  • Berwind, M.F.; Kamas, A.; Eberl, C., A Hierarchical Programmable Mechanical Metamaterial Unit Cell Showing Metastable Shape Memory, Advanced Engineering Materials 20/11 (2018) 1800771 1-6 Link
  • Nakanishi, K.; Aria, A. ; Berwind, M.; Weatherup, R. S.; Eberl, C.; Hofmann, S.; Fleck, N., Compressive behavior and failure mechanisms of freestanding and composite 3D graphitic foams, Acta Materialia 195 (2018) 187-196 Link