Abstract: Currently, most meta-structures with tailorable Poisson’s ratio were designed using isotropic materials such as polymers and metals. However, continuous fibre reinforced composite (CFRC) has demonstrated significant advantages when compared to these isotropic materials, but hitherto few relevant studies for CFRC meta-structures are reported. This study innovatively developed a concurrent level set-stream (L-S) topology optimization theory to acquire the CFRC meta-structures with customed Poisson’s ratios. First, the theory was proposed based on a parametric model that combines the level-set and stream functions to design the topological layout and fibre path of CFRC structures. Then, engineering structures with maximized stiffness or strength were designed to validate the method. Last, the theory was applied to high-precision design of CFRC meta-structures with customized Poisson’s ratio.

Keywords: Topology optimisation, continuous fibre-reinforced composite, negative Poisson's ratio, additive manufacturing, computational mechanics.

Acknowledgements: This work was supported by the National Natural Science Foundation of China (12302177), the Shenzhen Science and Technology Program, China (JCYJ20230807093602005), the Guangdong Basic and Applied Basic Research Foundation, China (2024A1515010203) and the Shenzhen Key Laboratory of Intelligent Manufacturing for Continuous Carbon Fibre Reinforced Composites (ZDSYS20220527171404011).

Biography: Dr. Yuan Chen serves as an assistant professor at Southern University of Science and Technology. He obtained his PhD degree from the University of Sydney in 2019. With extensive expertise in composite mechanics on mechanical modelling and mechanism analysis, structural optimization and multifunctional design, metamaterials and additive manufacturing, etc, he authored/corresponded 51 SCI-indexed papers, and his research outcomes have been well recognised and appraised by world-renowned experts, academic institutions, international organisations and so forth. He has been elected as Editor-in-Chief for Adv Manuf Polym Compos Sci (Taylor & Francis), Editorial board member of Compos Commun, Chin J Mech Eng, Acta Mech Sin, J Eng Math, etc. He has won several international awards including CSTE Young Researcher Award, CSTAM Young Researcher Program，MSAM Best Oral Presentation, etc. and he is also a member of youth executive commission and additive manufacturing commission under Chinese Society for Composite Materials, senior member of Chinese Society of Theoretical and Applied Mechanics, Royal Aeronautical Society (RAeS), European Materials Research Society, etc.