The article represents a brief review of models, characterizing the rheological features of wood. Judging from the analysis the author makes the conclusion that the exact rheological wood model doesn’t exist yet. The rheological models that exist nowadays reveal only reversible part of residual deformations. These residual deformations are known to be kept steady while being held under the conditions of constant temperature and humidity. The author conducted the experiments of wood pressure in radial direction and revealed that there were instantaneous irreversible deformations under the conditions of constant humidity and temperature. Their value doesn’t depend upon the time period of load operational dependence on the magnitude of tension being put. For description of wood plasticity they offered the rheological model, consisting of successive connection of elements of dry friction of different solidity. This model characterizes instantaneous irreversible deformations. They offered the more exact rheological model of wood being an elastically-plastically flexible solid and the rheological equation of wood taking into account instantaneous plastical deformations.

Key words: wood, rheology, elasticity, flexibility, viscosity, plasticity, rheologic equation

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