Tuning the mechanical behaviour of additively manufactured meta-materials with twinning and meta-harmonics - Raw Data

We study micro-architected twinned lattices produced by 3D printing in photopolymeric resin, Rigid 4K from Formlabs, by Stereolithography. Specifically, we present the mechanical behaviour of twinned BCC lattice architecture which shows deviation from the Gibson-Ashby model and a transition from bending-dominated to stretch-dominated behaviour with increased misorientation between adjacent sub-domains coined 'meta-grains'. The tuning of deformation mode also permits tuning of mechanical properties, stiffness and strength, and we introduce a heterogenous distribution of meta-grain sizes, a designt that we coin 'meta-harmonics', by which we enhance the local deformation mode and further increase stiffness.