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Prestressed polymeric matrix composites: longevity aspects

Prestressed polymeric matrix composites: longevity aspects
Prestressed polymeric matrix composites: longevity aspects
Elastically prestressed polymeric matrix composites (EPPMCs) are produced by stretching fibers (e.g., glass) within the composite during matrix curing. The resulting prestress can enhance mechanical performance, without increasing section dimensions or weight. Viscoelastically prestressed polymeric matrix composites (VPPMCs) can provide similar benefits, these being produced by subjecting polymeric fibers (e.g., nylon 6,6) to a creep load, which is released prior to molding. Although VPPMCs offer simplified processing and flexibility in product geometry, long-term viscoelastic activity within the prestressing fibers is sensitive to time-temperature limitations. In this study, nylon 6,6 fiber-polyester resin samples were subjected to accelerated ageing. Using time-temperature superposition, the samples were maintained at 70°C for 2,298 h, representing a 20-fold ageing increase over previous work. Subsequent Charpy impact testing (at 20°C) demonstrated that the VPPMC samples absorbed ?40% more energy than corresponding control (unstressed) counterparts; i.e., no deterioration in impact performance was observed, over a duration equivalent to ?25 years at 50°C. In contrast, the longevity of EPPMCs remains unknown, but it is suggested that progressive localized matrix creep at the fiber-matrix interface regions may cause a deterioration in elastically generated prestress with time and/or elevated ambient temperatures
0272-8397
1-6
Fancey, K.S.
302c38ff-a2df-4dce-bac0-ab094e8d689e
Fazal, A.
926d3b48-d11b-45b1-b922-5c2e8e3ba5fd
Fancey, K.S.
302c38ff-a2df-4dce-bac0-ab094e8d689e
Fazal, A.
926d3b48-d11b-45b1-b922-5c2e8e3ba5fd

Fancey, K.S. and Fazal, A. (2015) Prestressed polymeric matrix composites: longevity aspects. Polymer Composites, 1-6. (doi:10.1002/pc.23387).

Record type: Article

Abstract

Elastically prestressed polymeric matrix composites (EPPMCs) are produced by stretching fibers (e.g., glass) within the composite during matrix curing. The resulting prestress can enhance mechanical performance, without increasing section dimensions or weight. Viscoelastically prestressed polymeric matrix composites (VPPMCs) can provide similar benefits, these being produced by subjecting polymeric fibers (e.g., nylon 6,6) to a creep load, which is released prior to molding. Although VPPMCs offer simplified processing and flexibility in product geometry, long-term viscoelastic activity within the prestressing fibers is sensitive to time-temperature limitations. In this study, nylon 6,6 fiber-polyester resin samples were subjected to accelerated ageing. Using time-temperature superposition, the samples were maintained at 70°C for 2,298 h, representing a 20-fold ageing increase over previous work. Subsequent Charpy impact testing (at 20°C) demonstrated that the VPPMC samples absorbed ?40% more energy than corresponding control (unstressed) counterparts; i.e., no deterioration in impact performance was observed, over a duration equivalent to ?25 years at 50°C. In contrast, the longevity of EPPMCs remains unknown, but it is suggested that progressive localized matrix creep at the fiber-matrix interface regions may cause a deterioration in elastically generated prestress with time and/or elevated ambient temperatures

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e-pub ahead of print date: 21 February 2015
Organisations: EEE

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Local EPrints ID: 381437
URI: http://eprints.soton.ac.uk/id/eprint/381437
ISSN: 0272-8397
PURE UUID: fd273f69-7479-4ad7-97b7-8301b7c8ab4e

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Date deposited: 02 Oct 2015 14:31
Last modified: 16 Dec 2019 20:14

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