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Viscoelastically prestressed polymeric matrix composites: An investigation into fibre deformation and prestress mechanisms

Wang, Bing; Fancey, Kevin S.

Authors

Bing Wang

Abstract

© 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
Publication Date 2018-08
Journal Composites Part A: Applied Science and Manufacturing
Print ISSN 1359-835X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 111
Pages 106-114
Series ISSN 1359-835X
Institution 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
DOI https://doi.org/10.1016/j.compositesa.2018.05.013
Keywords A Polymer-matrix composites (PMCs); B Impact behaviour; B Residual/internal stress; Viscoelasticity
Publisher URL https://www.sciencedirect.com/science/article/pii/S1359835X18301921?via%3Dihub

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