NUMERICAL ANALYSIS OF MECHANICAL PROPERTIES OF AUXETIC CELLULAR MATERIAL CONSISTING OF RE-ENTRANT HEXAGONAL, HONEYCOMBS AND STAR-FISH

Sandwich panels are important because they offer a lightweight and economical structure that can be used in various fields and has several geometric shapes. For this study, we chose three honeycomb shapes (Hexagonal, RE-entrant and Star fish) with dimensions of 57mm×120mm and a thickness of 10mm. Aluminum type (Al 2024-T3) was used for the material. The design of the three honeycomb structures was carried out with CATIA V5R20 software, while the numerical analysis of their load capacity (tensile and compression) was carried out using the ABAQUS-CAE calculation code. A numerical study was also carried out to compare the results of the samples according to the different types of honeycomb used. The results showed that the RE-shaped structure had the highest load capacity in terms of tensile and compression. The maximum stress of 422.27 MPa was observed for the honeycomb-shaped structure RE-entering in traction. In contrast, the maximum tensile stress was lower for the starfish-shaped honeycomb, reaching a value of 145.5 MPa. For compression, the hexagonal honeycomb structure recorded the highest stress value of 590.5 MPa. The lowest stress value was measured for the starfish-shaped honeycomb structure, reaching 199.5 MPa.