About the peculiarities of using the material behavior model in structures with a cellular-carcass structure

Abstract

The modern development of computer modeling is deeply integrated into the processes of designing structures, including in the aerospace segment. The intensive integration of digital technologies into production processes has enabled the creation of additive technologies. These technologies help change classical approaches to object creation and achieve highly effective rational designs. One such design is lattice structures. These structures are created using Selective Laser Melting (SLM).

Lattice structures are complex three-dimensional constructions consisting of repeated elements or cells that form a spatial array. The elementary cell that makes up the structure can have various geometric configurations and to some extent represents a microframe. The geometry of the elementary cell determines the physical properties of the structure (density, strength, stiffness, anisotropy, etc.). Therefore, the geometry can be selected to provide high stiffness and strength while significantly reducing the mass of the structure, which is critical in the aerospace industry. However, additive manufacturing technology also affects the physical behavior model of such a structure. After manufacturing, the lattice structure has stress concentrators and zones of locally connected unmelted particles. All these factors affect the physical and mechanical characteristics and properties of the structure.

It should be noted that lattice structures are characterized by complex geometry of spatial arrays, so 3D modeling, processing, as well as numerical analysis and experiments using finite element methods (FEM) require extremely large resources.