Study of stability of flat panels made of hybrid materials with destroying composite layers

The effect of collapsing layers in flat panels made of a hybrid material on the stability under compression and shear is analyzed. The hybrid material is formed from carbon fiber and fiberglass blocks. The blocks form a symmetrical structure of layers relative to the neutral surface. The eigenvalue problem is solved in displacements by approximating the deflection function with "beam" functions depending on the support conditions on the panel contour. The minimum eigenvalues are determined – stability coefficients and critical compression and shear forces. The panel is loaded with a contour force in fractions of the critical force, the problem of postcritical deformation is solved by approximating the deflection as a product of an unknown amplitude and the minimum eigenform. Using the layer loading coefficients, the load-bearing capacity of the panel is estimated by the moment of failure of the most loaded layer/layers of different structures using the Tsai-Wu strength criterion. The ultimate force is established at which the loading coefficient in the most loaded layer is. This damaged layer is replaced by a fictitious layer with mechanical properties of the binder. The analysis of layer-by-layer destruction of hybrid panels is limited to five loading stages. As a result of the research, critical compressive and shear forces were found, allowing us to evaluate the effect of layer-by-layer destruction of the hybrid material on these values, and an effective reinforcement option for the hybrid package was determined.