3D PRINTED PLATE-LATTICE STRUCTURES: DESIGN, OPTIMIZATION, AND MECHANICAL PROPERTIES

Abstract

In this thesis, a novel class of crystal structure mimicking truss and plate hybrid lattice structures is purposed as isotropic lightweight structural and energy-absorbing material. Among the various structures, the combination of an octet truss and a plate (OT-P) constitutes the best elastic isotropy. The design is experimentally validated using samples fabricated via micro-selective laser melting using 316L stainless steel as the base material. To validate its isotropy, the structural properties in three directions: [100], [110], and [111], are studied. Compression tests reveal excellent elastic isotropy. The large-strain properties indicated high isotropy in the compressive strength and specific energy absorption. The high strength attributes to the plate members being aligned in the direction of compression. The high SEA in turn attributes to the stable, layer-by-layer deformation without abrupt stress–strain valleys. Overall, the potential of hybrid truss and plate lattice structures as advanced lightweight structural materials is demonstrated.