Viscoelastically prestressed polymeric matrix composites: An investigation into fibre deformation and prestress mechanisms
Wang, Bing; Fancey, Kevin S.
Dr Kevin Fancey K.S.Fancey@hull.ac.uk
© 2018 Elsevier Ltd A viscoelastically prestressed polymeric matrix composite (VPPMC) is produced by subjecting polymeric fibres to a creep load, which is removed before moulding the fibres into a polymeric matrix. The resulting fibre viscoelastic recovery creates compressive stresses within the cured matrix. Although mechanical properties can be improved by up to 50%, the effect of fibre creep stress magnitude on VPPMC performance is unknown. In this paper, viscoelastic effects were investigated for 24 h creep stress values of 330–590 MPa. This involved recovery force measurement and wide-angle X-ray diffraction (WAXD) on nylon 6,6 fibres and Charpy impact testing of nylon fibre-polyester resin VPPMCs. Greatest performance was achieved with an intermediate value (460 MPa), suggesting an optimum creep stress condition. Moreover, with increasing creep stress, WAXD demonstrated a progressive reduction in regions with viscoelastic energy storage capability. By considering polymeric three-phase microstructural and latch-based m echanical models, a viscoelastic fibre-generated prestress mechanism is proposed.
|Journal Article Type||Article|
|Journal||Composites Part A: Applied Science and Manufacturing|
|Peer Reviewed||Peer Reviewed|
|APA6 Citation||Wang, B., & Fancey, K. S. (2018). Viscoelastically prestressed polymeric matrix composites: An investigation into fibre deformation and prestress mechanisms. Composites Part A: Applied Science and Manufacturing, 111, 106-114. https://doi.org/10.1016/j.compositesa.2018.05.013|
|Keywords||A Polymer-matrix composites (PMCs); B Impact behaviour; B Residual/internal stress; Viscoelasticity|
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