We focused our research on the course of fracture of board composites under bending and tensile loads. 5 different industrially made wooden board composites: plywood, particle board, fibre board, construction board and OSB board were used. To compare the fractures, we chose similar board thicknesses, all between 17 and 19 mm. Fractures among individual boards varied substantially and could be linked to the size of the basic building element. By decreasing the size of the basic building element decreased the serration of the fraction, except with the fibre board where the serration got bigger. We also discovered a unique feature of the veneer board fracture, as the board fractures by layers, the force slightly increased before each fracture. The main variables for the difference of board fractures were size and shape of the basic building blocks, but also the distribution of density in the vertical direction, which was very homogeneous with the veneer boards, but varied in fibre and particle boards.
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