|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Nano/Micro-mechanics and Length-scale Phenomena
||Investigations of Toughening Mechanisms in Nanoarchitected Polymers
||Lucas Meza, Zainab Patel
|On-Site Speaker (Planned)
It is theorized that the remarkable toughness and damage tolerance of natural materials stems from their multiscale hierarchical architectures, but experimental quantification of toughening mechanisms at the micro- and nanoscale has historically been challenging. In this work, we demonstrate a novel method to both fabricate and mechanically test microscale crack propagation in nanoarchitected polymeric materials. Microscale beams with sub-micron features are created using two-photon lithography with unidirectional, helicoidal and herringbone architectures. Cracks are directly written into the beams, which are then tested in a 3-point bending configuration. We quantify the strain energy released during crack propagation in the different architectures, demonstrating enhanced energy dissipation mechanisms that emerge with increasing degrees of nanoscale structural complexity. This systematic investigation of toughening mechanisms imparts a fundamental understanding of the role of nanoscale architecture on crack propagation, energy dissipation, and toughening mechanisms.
||Additive Manufacturing, Nanotechnology, Polymers