About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Nanostructured Materials in Extreme Environments
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Presentation Title |
G-23: Scalable Fabrication and Mechanical Response of Composites with Nano-architected Features |
Author(s) |
Kevin Nakahara, Matias Kagias, Seola Lee, Julia R. Greer |
On-Site Speaker (Planned) |
Kevin Nakahara |
Abstract Scope |
Nano-architected materials with extremely low densities have been shown to possess high stiffness, strength, or supersonic impact resilience and gravimetric energy absorption comparable to Kevlar composites (200-400 m/s particle velocity). Using a 3D laser interference lithography process (LIL) and a metasurface mask, we produce nano-architected sheets (35μm-thick and 2.5 x 2.5cm2 wide, 500nm internal feature size) made of negative tone epoxy-based photosensitive resist (SU-8) which are impregnated with an acetone-diluted epoxy matrix 65μm-thick to create 100μm-thick composites. Mechanical characterization via indentation on a dynamic mechanical analysis (DMA) machine and laser-induced particle impact testing (LIPIT) on composites and neat nano-architected sheets, respectively, demonstrated specific energy absorptions up to 5x higher than Kevlar composites. These results show that introducing an interpenetrated secondary epoxy matrix results in elevated load tolerance and toughening, thus providing insights into the contribution of nano-architected layers to energy absorption at various strain rates. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nanotechnology, Composites, Mechanical Properties |