Characterization of Compressive Behavior of Novel Bio-Inspired Additively Manufactured Composite Sandwich Structures

This study presents a novel approach to creating lightweight corrugated sandwich panels using additive manufacturing, inspired by eco-friendly green sandwiches composed of Oak-tree cupules as core elements and balsa face sheets. The bio-inspired structures were fabricated using the Multi Jet Fusion method, employing Nylon PA12 GB infused with 40% glass beads. Through experimental evaluation, the quasi-static compressive characteristics and energy absorption behavior of the bio-inspired sandwich panels were examined to analyze the impact of geometrical dimensions on their ability to withstand compressive loads and absorb energy. Results indicate that the printed panels outperformed the bio-based samples of identical dimensions, demonstrating approximately five times greater peak load and energy absorption. Additionally, the performance of the printed panels regarding load capacity and energy absorption was found to be influenced by their geometrical dimensions.