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

1 2012

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Tensile, compressive and bending properties of European beech wood at high moisture levels

Ożychar T., Jüstrich S., Niemz P.

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

2012

No. 79

135--142

The current study is part of a bigger research project devoted to the investigation of anisotropic moisture-dependent elastic and strength properties of beech wood. The objective of this research is to determine the mechanical behaviour of European beech wood at high moisture levels. Therefore, investigations of the tensile, compressive and bending properties at different moisture levels near, and above the fibre saturation point (FSP) were conducted. Elastic and strength parameters, including Young`s moduli and strength values, were determined with respect to the three axes of anisotropy (longitudinal, radial, tangential). The results demonstrate the significant influence of moisture content (MC) on the mechanical behaviour of beech wood. They show that Young`s moduli and strength parameters decrease with increasing MC, whereby individual moduli and strength values are affected by the MC to different degrees. The experimental results further indicate that tensile, bending and compressive properties, in general, reach their minimum value near the FSP, even though, an increasing tendency was reported for the tensile and compressive Young`s moduli and a decreasing trend for the tensile strength at MC higher than FSP. Since the effect on the mechanical properties caused by the increase in MC above the FSP is relatively small compared with that below the FSP, the changes in mechanical behaviour induced by MC variations above the FSP are found to be rather weak.