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In this research, a mathematical model is derived to enable analytical determination of effective ultimate forces in the process of plasticization of the surface layer of wood. The experimentally determined thermo-mechanical properties of the material subjected to the process of plasticization are used in defining the structure of the model. The analysis of plastic strain in the layer in consideration...
Softwood is a typical orthotropic and porous material. In a dry state the unit volume of wood consists of the so-called wood skeleton and of the air-filled pores. The variable humidity produces the internal forces within the loaded material bulk loading to destruction. In the paper the mathematical model of the transition of the softwood into the plastic state is formulated and discussed. The outset...
The article presents the analysis of stress distribution in the process of plasticization of a thin layer of wood. The solution of the formulated problem was found on the basis of the Huber-Mises-Hencky hypothesis of ultimate energy of non-dilatational strain. The aim was reached by solving a set of plasticity equations for porous and orthotropic layer, by developing a formula for calculating critical...
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