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

Wang, Bing; Fancey, Kevin S.

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.

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

• Journal Article Type: Article
• Acceptance Date: May 12, 2018
• Online Publication Date: May 14, 2018
• Publication Date: 2018-08
• Deposit Date: Jun 8, 2018
• Publicly Available Date: May 15, 2019
• 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
• 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
• Public URL: https://hull-repository.worktribe.com/output/869080
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S1359835X18301921?via%3Dihub
• Contract Date: Jun 8, 2018