DEFORMATION OF RECTANGULAR ORTHOTROPIC PLATES OF MEDIUM THICKNESS MADE OF MATERIALS SENSITIVE TO THE TYPE OF STRESS STATE
A rectangular orthotropic plate of medium thickness made of materials sensitive to the type of stress state is considered. Due to the lack of a consistent theory and methods for calculating structures made of anisotropic materials whose mechanical properties do not correspond to classical concepts of elastic-plastic deformation of solids, there is a need to obtain it. This article presents an experimental approbation of a mathematical model of deformation, that takes into account the equations of state through the deformation potential in a normalized tensor stress space. Structural anisotropy is limited to the class of orthotropic materials. The deformation potential is limited by the level of quasi-linear equations. As part of the approbation of the developed mathematical model of deformation of single-layer rectangular plates, minding the phenomenon of resistivity and its software implementation, a plate rigidly supported along the contour was calculated. Based on the data obtained, graphs of stresses, deflections and horizontal displacements were constructed, and their analysis was carried out. The main conclusion drawn on the basis of the results obtained can be called the appearance of an error when using the theory without taking into account multimodulus behavior. To calculate the deformation of a rectangular orthotropic plate, a modification of hybrid finite elements with five degrees of freedom at the node and a stiffness matrix obtained directly for a triangular element with four nodes was used.