All constructions are subject to the most compound loads and therefore a suitable effort hypothesis should be used
for their calculation. For anisotropic materials, a hypothesis should be used to describe the properties of such
materials. In the work have been shown the strength of the layers composite on the example of construction wood in
a compound stress state. Wood composite is an orthotropic material. Wood is composed of alternating layers of soft
wood and hard wood. Single layers are monotropic material. The use of a stress hypothesis, which describes the
strength of an orthotropic material, requires will make an investigation. Studies is purposed to determine the tensile
strength along and across the fibres. The compressive strengths along and across the fibres and the shear strength.
Particularly the determination of shear strength requires special tooling so that in the case of flat samples in the
measuring part it is possible to determine the shear stresses. Therefore, a research stand was designed and
constructed. Known stress hypotheses for anisotropic materials have been analysed. The analysis showed that the
strength of the wood composite could be described by the Tai-Wu stress hypothesis. Based on the results of the
research, numerical calculations were performed. Calculations allowed determining the distribution of stresses in the
sample measuring part. The results tests and numerical calculations have shown that obtaining a homogeneous stress
(shear) condition for anisotropic materials is very difficult. Wood belongs to materials whose mechanical properties
depend on many parameters, so the description of the effort of this material is a compound issue. Studies have shown
that wood reinforcement by polymer saturation is best suited to the compressed loaded structures.
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