Stability Study of Monolithic and Layered Plates under Compression

In this paper, we present the calculation results of the stability of monolithic and layered plates that are obtained by analytical and numerical methods and are compared with experimental data. The results are within the limits of the permissible error. The results of numerical calculations of stability by the finite element method in the ANSYS program were higher than the values determined by the Euler formula and lower than the results obtained by the formula for calculating the stability of plates. To study the bearing capacity of layered samples under compression, their stability was estimated at various numbers and layouts of layers of alloy and composite material. The optimal layouts of layers in the material for designing a composite panel were determined. The results of stability studies of layered plates were used to design a composite wing panel based on sheets and profiles of high-strength aluminum-lithium alloy and layered aluminum-fiberglass. The compressive stability of the composite panel is 7% higher than the experimental values owing to local buckling of its elements, which precedes the general buckling and reduces the critical load.