|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||3D-printable Cactus and Spider-silk Hydrogel Composites for Next Generation Multifunctional and Sustainable Energy Absorptive Metamaterials
||Graham J. Day, Qicheng Zhang, Gianni Comandini, Adam Perriman, Fabrizio Scarpa
|On-Site Speaker (Planned)
||Graham J. Day
Energy absorptive materials are generally fossil-derived or metal-based in design. However, there are emerging opportunities to generate multifunctional composite materials derived from bio-based feedstocks for 3D-printable manufacture. For instance, natural fibre composites exhibit large loss factors in high-amplitude low frequency applications owing to fractal surface features and multiscale architecture and porosity. Here, we have utilized a 3D-printable alginate–pluronic hydrogel, which exhibits significant sound absorption properties as a filler in acoustic metamaterials; it can also be used as a scaffold for reinforcement with cactus-based fibres and mechanically impressive spider dragline silk. We have characterised the low frequency vibration damping properties of this hydrogel and measured loss factors comparable to auxetic foams. Notably, the dynamic modulus of this material is an order of magnitude higher that it’s static modulus, indicating behaviour like that of non-Newtonian fluids under dynamic conditions.
||Mechanical Properties, Additive Manufacturing, Composites