LAUSR

Abstract The aim of the present study was to initiate an investigation based on the design of a thin sandwich panel with an auxetic (i.e. exhibiting negative Poisson’s ratio) lattice core using wood composites and 3D print technology. The sandwich panels were fabricated by attaching the 3D LayWooden pyramidal truss structures to HDF face sheets with the PVCa adhesive. The mechanical strengths and failure mechanisms under bending load were estimated experimentally, analytically and numerically. The results showed that the mechanical properties of beams increase with an increasing inclination angle of struts and/or relative density of the core. No signs of damage were observed, such as face sheet crushing (FC) or wrinkling (FW), core member crushing (CB, CC) (delamination or fracture). Damage to the composites occurred due to shearing in the struts of the cells. The greatest rigidity was recorded for beams with a D-core. The data could provide insight into the design of optimized or near-optimized sandwich panels.