Impact Resistance Efficiency of Bio-inspired Composite Sandwich Beam with Different Core Materials

Yean, Tan Chun (2020) Impact Resistance Efficiency of Bio-inspired Composite Sandwich Beam with Different Core Materials. [Final Year Project Report] (Unpublished)

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Abstract

Impact resistance efficiency of newly designed of bio-inspired sandwich beam (BHSB) that was inspired by the woodpecker's head structural characteristics was investigated by equipping the first core layer (Core 1) with various type of materials while being subjected to 7.28J impact loading at the mid-span. The newly designed contains four main layers with top and bottom skin, first core layer (Core I) and second core layer (Core II). Top and bottom skin were made from carbon fiber reinforced plastic (CFRP) and second core layer were the aluminium honeycomb core. The first core layer was designed in arch shape with leg angle of 36°. Different core materials considered included hot melt adhesive (HMA), high-density polyethylene (HDPE), acrylonitrile butadiene styrene (ABS), epoxy resin (EPON862), aluminium 6061-T6 (AL606 1) and mild carbon steel (AISI1018). The detailed impact performance of the newly design BHSB is assessed numerically using the commercial finite element software, ABAQUS. All in all, the stress from impact load are transferred from the top skin to the core and then to the bottom skin. The pattern for the propagation largely depend on the properties of the materials applied on the first core layer. Besides, numerical contact force history, impact energy-time curve, deflection-time curve and kinematic motion of impactor for every specimen equipped with different materials were plotted in order to have a better view on the comparison between one another. In addition, the impact resistance efficiency index which assessed the overall performance of the sandwich structure specimens were computed and compared between each other. The impact resistance efficiency index of specimens equipped with steel (AIS11018) were found to be the highest and 3-10 times higher than other materials.

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