Designing an impact resistant sandwich panel composite using struct based structures

Abstract

Designing a composite structure with enhanced load-bearing capability opens the door for new high-performance applications. The heterogeneity of the material leads to complex behavior that is significantly influenced by changes in the geometries, constituents, applied load and their interaction. In this research, experimental design is used to study the interaction of three major design variables i.e. core structure, use of hybrid fibers and addition of carbon nanotubes (CNTs) on failure behavior of the composite. A new strut-based core structure that can be easily 3d printed is proposed and compared with traditional honeycomb, in addition to a hybrid fiber mix of carbon and Kevlar. To minimize designed panel cost while maximizing its energy absorption a mathematical model is formulated. Results reveal that there is a strong interaction between the nanofiller, cores structure and fiber material. This interaction highlights the need to examine design variables simultaneously. An Octet structure combined with carbon fibers and no CNTs offer the best impact resistance for high energy applications. For low energy purposes, Kevlar or a hybrid carbon-Kevlar combined with a honeycomb core provides a more efficient and cost-effective alternative. CNTs enhances the toughness of the panel as the impact energy increases.