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Publication - Dr Adam Thompson

    Mitigation Against Forming Defects by Local Modification of Dry Preforms


    Vermes, B, Thompson, A, Belnoue, J, Hallett, S & Ivanov, D, 2018, ‘Mitigation Against Forming Defects by Local Modification of Dry Preforms’.


    The advantages of continuous reinforcements are known – the continuity in material provides efficient load paths, avoids triggering delaminations at ply drops sites, and makes the ply deposition easier. However, the continuity of reinforcement causes difficulty in forming or draping of preforms. Some
    geometries may be simply not formable, i.e. it is not possible to comply material with a tool without excessive shearing and causing critical defects – wrinkles, folds, and fabric distortions. The paper discusses feasibility of a new approach to defect mitigation in forming: local modifications of textile preforms. The local deformability of preforms and the resistance of preforms to shearing is enhanced by printing liquid resin into preform and its subsequent thermal treatment. Modification of fabrics leads to the redistribution of shear angles and suppression of wrinkling. The position and distribution of patches with modified deformability were derived through numerical simulations. Manufacturing
    trials with the position of patches dictated by the simulations successfully confirmed the possibility of defect mitigation.

    Full details in the University publications repository