Design and optimization of high-performance 3D Euplectella aspergillum-like truss lattices insensitive to brittle material properties

Abstract

Lattice structures have emerged as a class of lightweight metamaterials with exceptional properties, however, low structural efficiency creates a dilemma to achieve simultaneously lightweight and strong. Here, we innovatively propose a novel truss lattice inspired by glass sponge. The optimal topology of ceramic lattice is proven to be insensitive to material parameters, via theoretical predictions and multi-objective optimization. Following the designed topology, ceramic lattices are fabricated via a digital light processing (DLP) system and uniaxial compression tests prove that lattice concurrently possesses high specific strength and superior energy absorption at low weight, surpassing the majority of macroscopic ceramic lattices. These excellent performance stems from the optimized topological design, which enhances buckling resistance. The ingenious design leads to reasonable compromise and provides a balance between mechanical properties. Our study demonstrates a feasible route to design geometries with programmable properties.