DESIGNING THREE-LAYER PLATES WITH VISCOELASTIC MIDDLE LAYER

Growing demand in innovative efficient designs and materials with predetermined properties for various industries stipulated necessity of intensive development of theory of multilayer plates. Design of multilayer plates in three-dimensional formulation is a complicated problem of structural mechanics. Nevertheless, some problems have been solved in three-dimensional theory of elasticity. However, in this work these procedures are not sufficiently efficient in terms of provision of minimum weight indices at required strength and rigidity. In conducted studies it has been revealed that the existing designs not always meet all the requirements to modern designs and engineering elements. In such cases it is necessary to use multilayer designs. This article stipulates the necessity to consider for specific peculiarities of elasticplastic layers in multilayer designs and combined action of layers under external loads. Theoretical results of bending three-layer panels with foamed polyurethane filler are presented, criteria of rigidity provision are highlighted, a method of static design of three-layer panels with metallic shells is proposed. This article also discusses the variant of multilayer plate where all layers have similar or close elastic modulus. This article stipulates necessity to calculate such designs as multilayer plates.