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2 Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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Bending strength of beech laminated wood after load by cyclic bending

100%

Gáborík J. , Langová N.

2018

tom No. 104

571--78

For unique properties is laminated wood particularly suitable for the production of seating and bedding. The main aim of this research is focused on the investigation of the bending properties of laminated beech wood after load by cyclic bending. During the cyclic load were observed properties, strength and elasticity, which changed unevenly. The changes in most cases were not statistically significant.

Withdrawal resistance of wood screw in wood-based materials

80%

Joščák P. , Langová N. , Tvrdovský M.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2014

tom No. 87

90--96

Withdrawal resistance of wood screw in wood-based materials.The aim of this paper is determine the impact of type of wood material and parameters of screws shoulder on withdrawal resistance of wood screw. Mechanical tests were realized in oak solid wood (Quercus robur L.), laminated particle board, and honeycomb board using wood screws and confirmate screw. For evaluation of withdrawal resistance of screws, the load carrying capacity, stiffness, and deformation on the ultimate strength were determined. We also evaluated the failure mode of wood material; in the solid wood it was taken into account the direction of screwing of wood screws relative to grain. The measured and calculated results show that the type of material and method of shoulder screws have the largest influence on the withdrawal resistance of wood screw.