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

 

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