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Conference Paper/Proceeding/Abstract 1252 views

Directional diffusion of moisture in carbon fibre-epoxy composites: experiments and modelling

Feras Korkees Orcid Logo, Sue Alston, Cris Arnold

20th International Conference on Composite Materials, Copenhagen, 19-24th July 2015

Swansea University Author: Feras Korkees Orcid Logo

Abstract

Water diffusion into composites in different directions was examined in this study, with the aim of determining the best way of measuring diffusion coefficients and also to provide values to compare with model predictions. The water absorption behaviour of unreinforced epoxy resins and carbon fibre...

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Published in: 20th International Conference on Composite Materials, Copenhagen, 19-24th July 2015
Published: 2015
URI: https://cronfa.swan.ac.uk/Record/cronfa31086
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first_indexed 2016-11-15T20:07:59Z
last_indexed 2018-02-09T05:17:38Z
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spelling 2016-11-15T14:12:19.9249101 v2 31086 2016-11-15 Directional diffusion of moisture in carbon fibre-epoxy composites: experiments and modelling 4d34f40e38537261da3ad49a0dd2be09 0000-0002-5131-6027 Feras Korkees Feras Korkees true false 2016-11-15 MTLS Water diffusion into composites in different directions was examined in this study, with the aim of determining the best way of measuring diffusion coefficients and also to provide values to compare with model predictions. The water absorption behaviour of unreinforced epoxy resins and carbon fibre reinforced epoxy composite materials was examined with long term exposure to different environmental conditions. Initial Fickian absorption was observed followed by a slower second stage that continues for at least 3.7 years. Fibre architecture was found to be an important aspect controlling absorption, where water diffusion along fibres was observed to be about three times faster than across the fibres and about seven times faster than through the thickness. A three-dimensional finite element computer model based on Fickian diffusion behaviour was developed to predict the levels of moisture absorption under hot/humid environments. A multi-scale modelling approach was used which allows the results of simulations at the microstructural level to be used to predict the diffusivities in different directions. Experimental results provided a baseline for the validation of the model, and comparison of these data with model predictions showed close matching and good agreement. The diffusion showed high dependency on the detailed microstructure. Conference Paper/Proceeding/Abstract 20th International Conference on Composite Materials, Copenhagen, 19-24th July 2015 Directional diffusion, Moisture absorption, Multi-scale modelling 31 12 2015 2015-12-31 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2016-11-15T14:12:19.9249101 2016-11-15T13:26:58.5244593 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Feras Korkees 0000-0002-5131-6027 1 Sue Alston 2 Cris Arnold 3
title Directional diffusion of moisture in carbon fibre-epoxy composites: experiments and modelling
spellingShingle Directional diffusion of moisture in carbon fibre-epoxy composites: experiments and modelling
Feras Korkees
title_short Directional diffusion of moisture in carbon fibre-epoxy composites: experiments and modelling
title_full Directional diffusion of moisture in carbon fibre-epoxy composites: experiments and modelling
title_fullStr Directional diffusion of moisture in carbon fibre-epoxy composites: experiments and modelling
title_full_unstemmed Directional diffusion of moisture in carbon fibre-epoxy composites: experiments and modelling
title_sort Directional diffusion of moisture in carbon fibre-epoxy composites: experiments and modelling
author_id_str_mv 4d34f40e38537261da3ad49a0dd2be09
author_id_fullname_str_mv 4d34f40e38537261da3ad49a0dd2be09_***_Feras Korkees
author Feras Korkees
author2 Feras Korkees
Sue Alston
Cris Arnold
format Conference Paper/Proceeding/Abstract
container_title 20th International Conference on Composite Materials, Copenhagen, 19-24th July 2015
publishDate 2015
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 0
active_str 0
description Water diffusion into composites in different directions was examined in this study, with the aim of determining the best way of measuring diffusion coefficients and also to provide values to compare with model predictions. The water absorption behaviour of unreinforced epoxy resins and carbon fibre reinforced epoxy composite materials was examined with long term exposure to different environmental conditions. Initial Fickian absorption was observed followed by a slower second stage that continues for at least 3.7 years. Fibre architecture was found to be an important aspect controlling absorption, where water diffusion along fibres was observed to be about three times faster than across the fibres and about seven times faster than through the thickness. A three-dimensional finite element computer model based on Fickian diffusion behaviour was developed to predict the levels of moisture absorption under hot/humid environments. A multi-scale modelling approach was used which allows the results of simulations at the microstructural level to be used to predict the diffusivities in different directions. Experimental results provided a baseline for the validation of the model, and comparison of these data with model predictions showed close matching and good agreement. The diffusion showed high dependency on the detailed microstructure.
published_date 2015-12-31T03:37:55Z
_version_ 1763751677999972352
score 11.016235

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