|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||2016 Functional Nanomaterials: Emerging Nanomaterials and Techniques for 3D Architectures
||Self-Assembled Ultra High Strength, Ultra Stiff Mechanical Metamaterials Based on Inverse Opals
||Jefferson do Rosário, Erica T. Lilleodden, Martin Waleczek, Roman Kubrin, Alexander Petrov, Pavel Dyachenko, Julian Sabisch, Kornelius Nielsch, Norbert Huber, Manfred Eich, Gerold Schneider
|On-Site Speaker (Planned)
||Erica T. Lilleodden
Mechanical metamaterials based on ceramic inverse opaline structures are not only suitable as photonic crystals but also show better stiffness- and compressive strength-to-weight ratios compared to micro-fabricated strut-based structures. This is demonstrated on both pure silica inverse opal structures and silica inverse opals with pores coated by a thin TiO2-layer. Our experimental results, supported by numerical simulations, show that these arch-shaped porous structures outperform both strut and honeycomb structures due to their nearly isotropic behaviour. Independent of the external loading direction, stresses are smoothly directed into the regions of higher material mass thereby mitigating the stress concentration at the pore perimeter, leading to both high stiffness and strength. This mechanism works independent of the loading direction and it is expected that both the elastic response and the compressive strength is nearly isotropic.