General model of wood in typical coupled tasks. Part I. – Phenomenological approach

KOŇAS, P.: General model of wood in typical coupled tasks. Part I. – Phenomenological approach. Acta univ. agric. et silvic. Mendel. Brun., 2008, LVI, No. 4, pp. 95–102 The main aim of this work is focused on FE modeling of wood structure. This task is conditioned mainly by diff erent organized structures/regions (tissues, anomalies...) and leads to homogenization process of multiphysics declaration of common scientifi c and engineering problems. The crucial role in this paper is played by derivation of coeffi cient form of general PDE which is solvable by nowadays numerical solvers. Generality of supposed model is given by wide range of coupled physical fi elds included in the model. Used approach summarizes and brings together models for various fi elds of matter and energy common in wood material in wood drying process, but is also suitable for a lot of diff erent tasks of similar materials. Namely microwave drying of wood with orthotropic, viscoelastic material properties together with time, moisture and temperature dependency of structural strains by modifi ed mechanical properties were included. Specifi c matrixes of elasticity for in di vidual fi elds were derived. Thermal fi eld in wood was described by conduction type of spreading. Coupling of physical fi elds is based on diff usive character of temperature, moisture, static pressure fi elds movement. FEM, multiphysics, wood drying