Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 111, Issue -, Pages 106-114Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2018.05.013
Keywords
Polymer-matrix composites (PMCs); Impact behaviour; Residual/internal stress; Viscoelasticity
Funding
- China Scholarship Council
- School of Engineering & Computer Science
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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 threephase microstructural and latch-based mechanical models, a viscoelastic fibre-generated prestress mechanism is proposed.
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