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On the validity of bias-extension test method for the characterisation of in-plane shear properties of rapid-cure prepregs
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Khan, Muhammad Aurangzeb, Pasco, Corentin, Reynolds, Neil and Kendall, Kenneth N. (2020) On the validity of bias-extension test method for the characterisation of in-plane shear properties of rapid-cure prepregs. Composite Structures, 246 . 112399. doi:10.1016/j.compstruct.2020.112399 ISSN 0263-8223.
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Official URL: https://doi.org/10.1016/j.compstruct.2020.112399
Abstract
In-plane intraply shear deformation studies are commonly conducted as a means to characterise the formability of prepreg materials. Using observations and data collected during recent studies on rapid-cure epoxy thermoset prepregs, this study presents a critical analysis of widely-adopted test methods in this area. Particularly, the in-plane shear deformation behaviours of three different epoxy-carbon fibre prepregs with woven and unidirectional reinforcement architectures were characterised using bias-extension tests along with an optical strain measurement method. A range of industrially-relevant process parameters in terms of temperature and shear rate were used. It was demonstrated that under bias-extension deformation at higher temperatures, the experimentally measured shear angle deviates significantly from the theoretical, suggesting that inter-tow slippage becomes the dominant deformation mechanism. An attempt is made to characterise deviations in the case of each material using novel data visualisation methods. The validity of bias-extension testing without advanced instrumentation as a suitable means of characterisation of these materials at candidate process conditions is discussed. Finally, this investigation concludes to recommend an intermediate range of temperature to avoid a number of problems when processing rapid-cure prepregs.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > Q Science (General) T Technology > TA Engineering (General). Civil engineering (General) T Technology > TJ Mechanical engineering and machinery |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
Journal or Publication Title: | Composite Structures | ||||||||
Publisher: | Elsevier Ltd | ||||||||
ISSN: | 0263-8223 | ||||||||
Official Date: | 15 August 2020 | ||||||||
Dates: |
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Volume: | 246 | ||||||||
Article Number: | 112399 | ||||||||
DOI: | 10.1016/j.compstruct.2020.112399 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Funder: | EPSRC (HVM Catapult Researcher-in-Residence programme) | ||||||||
Grant number: | EP/R513581/2 |
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