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Non-Hierarchical Architected Materials with Extreme Stiffness and Strength

机译：Non-Hierarchical Architected Materials with Extreme Stiffness and Strength

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摘要

Stretch-dominated truss and plate microstructures are contenders in thequest for realizing architected materials with extreme stiffness and strength.In the low volume fraction limit, closed-cell isotropic plate microstructuresmeet theoretical upper bounds on stiffness but have low buckling strength,whereas open-cell truss microstructures have high buckling strength at thecost of significantly reduced stiffness. At finite volume fractions, the picturebecomes less clear but both are outperformed by hollow truss lattice andhierarchical microstructures in terms of buckling strength. Despite significantadvances in manufacturing methods, hollow and multi-scale hierarchicalmicrostructures are still challenging to build. The question is if there existrealizable microstructures providing stiffness and strength matching or evenbeating hard-to-realize hollow or hierarchical microstructures?Herein, single-scale non-hierarchical (first order) microstructures that beatthe buckling strength of hollow truss lattice structures by a factor of 2.4and first- and second-order plate microstructures by factors of 5 and 1.4,respectively, are systematically designed, built, and tested. Stiffness of themicrostructures is within 40% of theoretical bounds and beats both truss andsecond order plate microstructures. The microstructures are realized with 3Dprinting. Experiments validate theoretical predictions and additional insight isprovided through numerical modeling of a CT-scanned sample.

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