Geometrical Effects on the Structural Behavior of Octahedral Unit Cells in Anisogrid Sandwich Panels

Anisogrid lattice structures are gaining increasing attention due to their high strength-to-weight ratios, which make them ideal for the production of lightweight mechanical components. This study presents a finite element model developed to evaluate stress distribution in an anisogrid sandwich panel with an octahedral core. The Taguchi method and analysis of variance (ANOVA) were employed to identify the geometric parameters that mostly influence the stress state and, consequently, the structural strength. The radius of the inclined ribs and the thickness of the skins were identified as the most critical factors, while the influence of the horizontal rib cross-sectional area was found to be minimal. The stiffness and strain energy of different cell geometries were also evaluated, and the results are consistent with the stress-based analysis. These findings offer valuable guidance for optimizing anisogrid geometry, improving load-bearing performance and advancing the design of high-efficiency structures.