DETERMINATION OF THE STRENGTH CHARACTERISTICS OF TRAPEZOIDAL MULTIFRACTALS

Abstract

The article presents the results of an experimental study of the strength of trapezoidal multifractals manufactured from PETG by FDM (Fused Deposition Modeling) 3D printing. The investigated specimens were regular discrete structures with a trapezoidal outer contour and a multifractal system of internal triangular cells, whose geometry was defined by the anisotropy parameter ε.
The specimens were subjected to uniaxial compression tests with continuous recording of the load–displacement curves and determination of the maximum failure load. The relationship between the ultimate load-bearing capacity of the multifractals and the anisotropy parameter ε was established, and their fracture behavior was investigated. It was found that an increase in the anisotropy parameter leads to a higher maximum failure load, while the deformation process is accompanied by the formation of inclined shear planes and the localization of residual deformation mainly in the edge regions of the specimens.
The obtained results can be used in the design of lightweight structures with controlled mechanical properties for applications in mechanical engineering, transportation engineering, civil engineering, and additive manufacturing.