Mechanical properties of carbon fiber composite octet-truss lattice structures

Hybrid Metal/Composite Lattice Structures: Design for Additive Manufacturing

“…One of the most important aspects of the proposed procedure is the generation of the unit cell which will be used to fill the entire domain. In order to satisfy this requirement, several types of unit cell have been implemented [45][46][47].…”

Three-dimensionally printed cellular architecture materials: perspectives on fabrication, material advances, and applications

“…CFRP laminate sheets are mostly used as the source, which contains 55 vol.%, 228 GPa carbon fiber in a vinyl ester matrix. [57,58] Figure 8. Architectured structures from carbon and composite materials: (a) Polymer structure before pyrolysis: whole structure; (b) close-up view of a single unit cell [12] ; (c) a 3D printed graphene aerogel microlattice; (d, e) pyrolysis of polymer nanolattices, which shrinks isotropically to about 20% of their initial size, from (a) and (b), respectively, to generate glassy carbon; and (f) Scanning electron microscope (SEM) image of the same graphene aerogel.…”

Shear response of carbon fiber composite octet-truss lattice structures

“…The mechanical performance of a sandwich panel is governed by its geometry (face sheet thickness and core height) and by the mechanical properties of its faces and core with the latter governed by the core topology and properties of the materials used to make it. In addition to their significant bend resistance, some sandwich panel structures also provide substantial out of plane compressive strength [7,8,9,10,11,12,13,14,15], and have attracted interest for mitigating the effects of impulsively applied loads [16,17,18,19,20,21].…”

“…Lattice topology core structures with pyramidal and tetrahedral cell topologies [3] have been developed to promote truss deformation in a stretch dominated manner [22], whereupon the stiffness and strength scale linearly with relative density, , of the lattice structure (the density of the lattice structure divided by that of the material from which it was made) [4,5,23]. The use of high specific stiffness carbon fiber reinforced polymer (CFRP) laminates to make sandwich panel structures using single layer pyramidal lattice has been explored recently [11,12,13,14,24].…”

“…Carbon fiber composites (CFRP) have a higher specific strength and stiffness than aluminum and titanium alloys, and are therefore a promising material for making stiff and potentially strong cellular structures for ambient temperature, lightweight applications. The application of a simple "snap-fit" assembly method [10] for fabricating and joining the pyramidal trusses and intermediate faces of an octet-truss cellular material made from CFRP laminates has been recent described [14]. The compressive responses of the octet-truss lattice in both its [001] and [100] directions were characterized as a function of the lattice relative density.…”