Impact behavior of a stiffened shell structure with optimized GFRP corrugated sandwich panel skins

摘要

The aim of this work is to provide a virtual testing for the three-layered shells made of the optimized corrugated core sandwich panels. Starting from the unit cells level, we define their geometry found from the preliminary optimization and ensured the requirements of strength, stability and effective thermal conductivity. Effective stiffness properties of the core are evaluated then by using asymptotic homogenization method. The mechanical performance of the non-axisymmetric stiffened shell made of the considered sandwiches is studied numerically for the low-velocity impact. Solid-shell model with homogenized properties of the core is used for the skin material of the shell. Multi-scale approach is involved in the evaluation of the global and local stress state of the panels using stress concentration tensor estimated during asymptotic homogenization. As result, we check the robustness of the design approaches for the unit cells and its validity in the case of the complex loading conditions in the three-dimensional structure.