Predictive modeling of homogenized mechanical properties for multifunctional gyroid-based aerospace structures

Kurzfassung

Gyroid sheet networks are a promising core structure for multifunctional sandwich panels, offering excellent load-bearing capabilities alongside omnidirectional permeability. The key to exploiting their full lightweight potential is to predict the homogenized mechanical properties based on readily available solid material parameters. This study develops material-independent predictive models for the homogenized compressive modulus, yield strength, and strength by separating the Gyroid's structural response from the contribution of the base material. Numerical and experimental investigations were carried out on Ti6Al4V and Nylon 11 at relative densities between 10% and 60%. Additional solid specimens form the basis for the material models and for normalizing the homogenized Gyroid properties. The results validate the material-independent modeling for the homogenized compressive modulus and yield strength across the entire investigated relative density range. The analysis of the homogenized compressive strength in combination with plastic strain distributions at the cellular level highlights the influence of base material strain hardening and ductility. Compared to the FE benchmark, practical imperfections reduce the experimentally measured homogenized mechanical properties by 15% to 35%. From an application perspective, the findings of this study establish a framework for designing load-bearing Gyroid cores for compressive stiffness and strength, independent of the specific base material.