BIO-INSPIRED AM STRUCTURE WITH CARBON FIBRE REINFORCEMENT

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Date

2023

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University of Texas at Austin

Abstract

This study presents a novel design approach that introduces the bouligand fibre arrangement in a honeycomb structure. This design is made possible by utilising AM technology which allows for the realisation of complex design whilst ensuring precise control for fibre placement. Reinforced honeycomb structures with varied incrementally twisted pitch angle of 0°,1.25°,5° and 15° were successfully fabricated and tested under outof-plane compression. Among the tested angles, the honeycomb structure oriented at 1.25° exhibited higher peak load and higher specific energy absorption. Unlike the original untwisted honeycomb, the bio-inspired honeycomb showed no noticeable buckling or delamination at the mid-plane, which may be due the microcracking or resulting from a delay in crack propagation. However, the precise relationship between pitch angle and honeycomb properties requires further investigation across a wider range of pitch angle with more focus understanding the fracture propagation in fibre arrangement. Overall, the preliminary results indicate that the proposed bio-inspired AM design present a promising approach to enhance the properties of honeycombs and afford the flexibility to improve toughness and energy absorption capabilities.

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