Three-Layer Structural Elements of Aviation and Space Technology. Methodology for Constructing Models of Layer-by-Layer Finite Element Analysis of the Stress-Strain State of Irregular Three-Layer Shells, Including Those with Rectangular Cutouts

The paper considers the use of three-layer structural elements in aviation and space technology. A review of works on the study of the stress-strain state of shells weakened by cutouts, in particular, three-layer shells, is given. The paper presents a methodology for constructing models of layer-by-layer finite element analysis of the stress-strain state in the general case of irregular three-layer shells, including those with rectangular cutouts.