Abstract
The article is focused on simulation of moisture transfer in wood of norway spruce (Picea abies L.). Experimental specimen was exposed to the northern climatic conditions in Lund University, Sweden. The moisture content of wood was measured 10 mm from the surface for nearly three years. The ABAQUS program was used for numerical modelling of moisture transfer simulation in 3D. The surface sorption of wood was simulated using user defined subroutine DFLUX developed by VTT Research Centre of Finland Ltd. for the needs of European Project Durable Timber Bridges. Climate data for the analysis was used from insitu measurement nearby realized by weather station. The temperature, relative humidity of the air and precipitation data was record each hour. Numerical analysis took into account influence of rain effect on different parts of specimen surface.
Highlights
Wood is hygroscopic [1] and anisotropic [2] material
Once the ambient air humidity decreases, the surplus of moisture becomes released from wood structures and is distributed in the ambient environment
The calculation step in ABAQUS software was set to 6 hours. This time period for calculation step was set in order to reduce the calculation time
Summary
Wood is hygroscopic [1] and anisotropic [2] material. It is natural material which works even when built in a construction. Over time wood adsorbs the ambient moisture, changing its mechanical and elastic properties. In case the ambient environment is too humid, wood moisture may exceed the point of wood fibre saturation [5] This may be caused by rain, snow and a longer time period with high air humidity and possible water condensation on the surface of a wood sample. In this condition all capillaries in wood are fully filled with water and the wood structure starts containing free water, not just bound water, as is the case before reaching this point [5]
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