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Publication - Professor Ian Hamerton

    Quasi-isotropic and pseudo-ductile highly aligned discontinuous fibre composites manufactured with the HiPerDiF (High Performance Discontinuous Fibre) technology

    Citation

    Longana, M, Yu, H, Lee, J, Pozegic, T, Huntley, S, Rendall, T, Potter, K & Hamerton, I, 2019, ‘Quasi-isotropic and pseudo-ductile highly aligned discontinuous fibre composites manufactured with the HiPerDiF (High Performance Discontinuous Fibre) technology’. Materials, vol 12.

    Abstract

    Conventional composite materials reinforced with continuous fibre display high specific strength but have a number of drawbacks including: the elastic-brittle behaviour, difficulties in producing defect-free components of complex shape with high-volume automated manufacturing processes, and inherent lack of recyclability. Highly aligned discontinuous fibre reinforced composites (ADFRCs) are truly beneficial for mass production applications, with the potential to offer better formability and comparable mechanical properties with continuous fibre reinforced composites. In previous publications, the High Performance Discontinuous Fibre (HiPerDiF) technology has been shown to offer the possibility to hybridise intimately different types of fibres, to achieve pseudo-ductile tensile behaviour, and remanufacture reclaimed fibres into high performance recycled composites. However, to date, the work has been conducted with unidirectional (UD) laminates, which is of limited interest in engineering applications with mechanical stresses acting across many directions; this paper reports, for the first time, the mechanical behaviour of quasi-isotropic (QI) ADFRCs. When compared with randomly-oriented discontinuous fibre composites (RODFRCs), QI ADFRCs offer enhanced stiffness (+26%) and strength (+77%) with higher consistency, i.e. a reduction of the coefficient of variance from the 25% of RODFRCs to the 6% of ADFRCs. Furthermore, hybrid QI ADFRCs retain the pseudo-ductility tensile behaviour previously observed in unidirectional (UD) lay-up.

    Full details in the University publications repository