Exploring the Impact of Honeycomb Orientation on the Mechanical Performance of Sustainable Sandwich Beams with Recycled-PET Core

This research investigates the influence of honeycomb orientation when used as a core component of sandwich beams. The parameter analysis included data obtained from eight sandwich beam sets tested in four-point bending conditions. The changing set parameters included the core thickness and facing components and the density of the core component. Initially, sandwich panels were fabricated in a wet layup process. The sets were cut into beams in two directions with respect to beam length; the beam length was 250 mm and held constant among the sets. The testing parameters—including the loading rate, fixture, and span—were also held constant. The research reports a change in both the top and bottom facing stress–strain rate, overall beam stiffness, and moment–curvature due to the change in honeycomb orientation during bending. Additionally, the change in ultimate failure mode among the sandwich beam sets has been reported. Results show the substantial influence of honeycomb orientation on the mechanical behavior of sandwich beams. The findings emphasize the need for careful consideration of honeycomb orientation in the design and evaluation of sandwich beams to optimize mechanical performance and guarantee safe utilization.