![]() ![]() The shear and three-point bending tests were performed according to the standard to ensure repeatability. Shear band and plastic hinges were observed during the in-plane tests. The compression tests were carried out to assess the in-plane and out of plane stiffness and strength by selecting a representative number of cells. The PP-flax and the PLA core structures were tested separately as well as bonded together to evaluate the structural performance as sandwich panels. These sandwich structures considered had skins made of polypropylene (PP)-flax bonded to the polylactic acid (PLA) lattice structure core using bi-component epoxy adhesive. The specimens tested were manufactured with an open source fused filament fabrication-based 3-D printer. Effects of the shape of three selected lattice structures on the compression, shear and bending strength has been experimentally investigated. A full mechanical characterisation of three types of 3-D printed lattice cores was performed to evaluate the feasibility of using additive manufacturing (AM) of lightweight polymer-based sandwich panels for structural applications.
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