Compression behaviour of the wood-based X-type lattice sandwich structure

In this paper, a wood-based X-type lattice sandwich structure was manufactured via a type of insertion-glue method. Oriented strand board (OSB) was used as panel, birch was used as core and epoxy resin was used as adhesive. The compression behavior of the wood-based X-type lattice sandwich structure with different drilling depth (9 mm, 12 mm, and 15 mm), core spacing (12 mm, 30 mm and 48 mm) and core size (L50D8, L60D8) was investigated by a flatwise compressive test and a theoretical model was established to study the elastic constitutive relationship of the X-type lattice sandwich structure, including the equivalent compressive strength/modulus, and the specific strength. Results from the flatwise compressive test and the theoretical model showed that the failure modes of the wood-based X-type lattice sandwich structure were mainly shear failure of the core. The experimental values of compression modulus were less than the theoretical values. The deeper the depth of the drill hole, the shorter the core spacing, and the smaller the core size, the greater the compressive performance of the wood-based X-type lattice sandwich structure.