Prestressed polymeric matrix composites: Longevity aspects

Fancey, Kevin and Fazal, Adnan (2016) Prestressed polymeric matrix composites: Longevity aspects. Polymer Composites, 37 (7). pp. 2092-2097. ISSN 0272-8397

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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.

Item Type: Article
Additional Information: This is the peer reviewed version of the following article: Fancey, K. S. and Fazal, A. (2016), Prestressed polymeric matrix composites: Longevity aspects. Polym. Compos., 37: 2092-2097. doi:10.1002/pc.23387, which has been published in final form at https://doi.org/10.1002/pc.23387 . This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions."
Subjects: F200 Materials Science
H100 General Engineering
H700 Production and Manufacturing Engineering
Divisions: Faculty of Computing, Engineering and the Built Environment
Faculty of Computing, Engineering and the Built Environment > School of Engineering and the Built Environment
REF UoA Output Collections > REF 2021 UoA12: Engineering
Depositing User: Euan Scott
Date Deposited: 21 Jan 2019 16:04
Last Modified: 31 Jan 2019 10:46
URI: http://www.open-access.bcu.ac.uk/id/eprint/6881

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