Engineering resilient hierarchical metamaterials

超材料可以被设计成多功能的（提供传统工程材料无法实现的特性组合），并占据以前空着的材料特性空间区域（例如低密度下的高刚度，强度和断裂韧性）。最近在具有可扩展性的“大面积成瘾性制造”方面取得的进展，以前无法通过双光子聚合或传统的立体光刻实现，这有望大大减少制造时间，这将加快工业吸收。虽然最近在理解分层设计原理如何影响机械鲁棒性和损伤容限方面取得了重大进展，但也存在许多差距。例如，如何通过增韧机制抑制断裂;减少结构不稳定性;以及如何优化高韧性，同时在低密度下保持高刚度和强度。本计画将著重于超材料之韧性断裂与疲劳损伤响应。理论建模（均匀化），实验和数值模拟（FE）将被用来链接微观结构现象，可观察到的宏观变形响应和散装性能。其目的是获得在多个长度尺度上发展的损伤机制之间的相互作用的基本理解，制定理论方法，以获得其属性的界限，并提供这些材料的设计准则。

Metamaterials can be engineered to be multifunctional (offering combinations of properties not achievable by conventional engineering materials) and occupy regions of material property space (such as high stiffness, strength and fracture toughness at low density) that were previously empty. Recent advances in `large-area addictive manufacturing with scalability, not previously achievable by two-photon polymerization or traditional stereolithography, promise significantly reduced manufacturing time, which will speed up industrial uptake. Whilst significant recent progress had been made to understand how the principles of hierarchical design affect mechanical robustness and damage tolerance, there are also many gaps. For example, on how to suppress fracture through toughening mechanisms; reduction of structural instabilities; and, how to optimise for high toughness, yet maintain a high stiffness and strength at low density. This proposed project will focus on the ductile fracture and fatigue damage response of metamaterials. Theoretical modelling (homogenization), experiments and numerical simulations (FE) will be used to link microstructural phenomena to observable macroscopic deformation response and bulk properties. The aim is to obtain a fundamental understanding of the interactions between damage mechanisms that develop at multiple length scales, formulate theoretical methods for obtaining bounds on their properties, and provide guidelines for design with these materials.