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Viscoelastically prestressed polymeric matrix composites –Effects of test span and fibre volume fraction on Charpy impact characteristics

Viscoelastically prestressed polymeric matrix composites –Effects of test span and fibre volume fraction on Charpy impact characteristics
Viscoelastically prestressed polymeric matrix composites –Effects of test span and fibre volume fraction on Charpy impact characteristics
A viscoelastically prestressed polymeric matrix composite (VPPMC) is produced by subjecting polymeric fibres to tensile creep, the applied load being removed before moulding the fibres into a resin matrix. After matrix curing, the viscoelastically strained fibres impart compressive stresses to the surrounding matrix, thereby improving mechanical properties. This study investigated the mechanisms considered responsible for VPPMCs improving impact toughness by performing Charpy impact tests on unidirectional nylon 6,6 fibre–polyester resin samples over a range of span settings (24–60 mm) and fibre volume fractions (3.3–16.6%). Comparing VPPMC samples with control (unstressed) counterparts, the main findings were: (i) improved impact energy absorption (up to 40%) depends principally on shear stress-induced fibre–matrix debonding (delamination) and (ii) energy absorption improves slightly with increasing fibre volume fraction, but the relationship is statistically weak. The findings are discussed in relation to improving the impact performance of practical structures
polymer–matrix composites, impact behaviour, mechanical testing, prestress
1359-8368
472-479
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.
302c38ff-a2df-4dce-bac0-ab094e8d689e

Fazal, A. and Fancey, K.S. (2013) Viscoelastically prestressed polymeric matrix composites –Effects of test span and fibre volume fraction on Charpy impact characteristics. Composites Part B: Engineering, 44 (1), 472-479. (doi:10.1016/j.compositesb.2012.04.004).

Record type: Article

Abstract

A viscoelastically prestressed polymeric matrix composite (VPPMC) is produced by subjecting polymeric fibres to tensile creep, the applied load being removed before moulding the fibres into a resin matrix. After matrix curing, the viscoelastically strained fibres impart compressive stresses to the surrounding matrix, thereby improving mechanical properties. This study investigated the mechanisms considered responsible for VPPMCs improving impact toughness by performing Charpy impact tests on unidirectional nylon 6,6 fibre–polyester resin samples over a range of span settings (24–60 mm) and fibre volume fractions (3.3–16.6%). Comparing VPPMC samples with control (unstressed) counterparts, the main findings were: (i) improved impact energy absorption (up to 40%) depends principally on shear stress-induced fibre–matrix debonding (delamination) and (ii) energy absorption improves slightly with increasing fibre volume fraction, but the relationship is statistically weak. The findings are discussed in relation to improving the impact performance of practical structures

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Accepted/In Press date: 5 April 2012
Published date: January 2013
Keywords: polymer–matrix composites, impact behaviour, mechanical testing, prestress
Organisations: EEE

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Local EPrints ID: 381442
URI: http://eprints.soton.ac.uk/id/eprint/381442
ISSN: 1359-8368
PURE UUID: ebd2fcd7-1ee1-47c2-9098-a0f6ac87c7b1

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Date deposited: 02 Oct 2015 15:24
Last modified: 14 Mar 2024 21:15

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Contributors

Author: A. Fazal
Author: K.S. Fancey

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