Speaker
Description
The use of multilayer structural elements is widespread in modern industrial applications. Recently, the use of so-called metamaterials has become widespread, in which the necessary mechanical properties are provided by the use of a cellular structure. Determining the physical and mechanical properties of such materials experimentally in many cases is impossible or very difficult. Therefore, numerical methods are used for this, primarily the Finite Element Method (FEM). At the same time, especially in cases of a new, non-standard configuration of cells, significant errors may occur in determining the physical and mechanical properties of a material with generalized properties, for example, orthotropic. Therefore, it is useful to verify the obtained data by the results of numerical and experimental modeling in a complex stressed state and, possibly, to clarify the data on physical and mechanical properties.
Such approach is used in the paper. Three-layer plates with an auxetic inner layer under static and impact loading are considered. The physical and mechanical properties of the averaged orthotropic material of the inner layer are obtained using Finite Element modeling. The results of numerical modeling of bending and tension of a plate with averaged orthotropic properties are compared with the data of full three-dimensional modeling and experimental research.
The obtained results are used to analyze the dynamic behavior of three-layer plates, the outer layers of which consist of carbon fiber material, and the inner layer presents by the studied material with auxetic properties. The problems of impact loading of plates during their interaction with a metal striker are considered. Deformation is analyzed taking into account the impact on the outer plate, which can lead to damage to the internal layer’s cells or complete penetration of the plate. Variants of plates made of different materials are considered.
