Air evacuation and resin impregnation in semi-pregs: effects of feature dimensions

Prepregs with discontinuous resin (semi-pregs) impart robustness to vacuum-bag-only processing of composites. Limited guidance exists for evaluating advantageous resin patterns (i.e. dry space dimensions required to achieve both efficient air evacuation and full resin infiltration during cure). A fl...

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Autores principales:	Sarah G. K. Schechter, Lessa K. Grunenfelder, Steven R. Nutt
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2020
Materias:	prepreg polymer matrix composites porosity defects carbon fiber epoxy out of autoclave processing vacuum bag only Polymers and polymer manufacture TP1080-1185 Automation T59.5
Acceso en línea:	https://doaj.org/article/eaa183bae6b946328aeefb0ae221e008
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spelling	oai:doaj.org-article:eaa183bae6b946328aeefb0ae221e0082021-12-02T12:26:51ZAir evacuation and resin impregnation in semi-pregs: effects of feature dimensions2055-035910.1080/20550340.2020.1768348https://doaj.org/article/eaa183bae6b946328aeefb0ae221e0082020-04-01T00:00:00Zhttp://dx.doi.org/10.1080/20550340.2020.1768348https://doaj.org/toc/2055-0359Prepregs with discontinuous resin (semi-pregs) impart robustness to vacuum-bag-only processing of composites. Limited guidance exists for evaluating advantageous resin patterns (i.e. dry space dimensions required to achieve both efficient air evacuation and full resin infiltration during cure). A flow front model was developed based on resin cure kinetics and rheological behavior, and then determined maximum dry space dimensions for semi-pregs under a range of realistic manufacturing conditions. Model predictions were validated in situ. Under controlled laboratory cure conditions, small surface openings (≤3.7 mm) resulted in full resin infiltration. Under adverse conditions (resin with accrued out-time), the maximum opening size dropped 40% (to ≤2.2 mm). Using a mathematical model, air evacuation time was calculated for various feature sizes using permeability measurements. Model predictions were tested and verified via fabrication of laminates. This methodology can be applied to other resin systems to guide vacuum-bag-only prepreg design and support robust production of composites.Sarah G. K. SchechterLessa K. GrunenfelderSteven R. NuttTaylor & Francis Grouparticleprepregpolymer matrix compositesporositydefectscarbon fiberepoxyout of autoclave processingvacuum bag onlyPolymers and polymer manufactureTP1080-1185AutomationT59.5ENAdvanced Manufacturing: Polymer & Composites Science, Vol 6, Iss 2, Pp 101-114 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	prepreg polymer matrix composites porosity defects carbon fiber epoxy out of autoclave processing vacuum bag only Polymers and polymer manufacture TP1080-1185 Automation T59.5
spellingShingle	prepreg polymer matrix composites porosity defects carbon fiber epoxy out of autoclave processing vacuum bag only Polymers and polymer manufacture TP1080-1185 Automation T59.5 Sarah G. K. Schechter Lessa K. Grunenfelder Steven R. Nutt Air evacuation and resin impregnation in semi-pregs: effects of feature dimensions
description	Prepregs with discontinuous resin (semi-pregs) impart robustness to vacuum-bag-only processing of composites. Limited guidance exists for evaluating advantageous resin patterns (i.e. dry space dimensions required to achieve both efficient air evacuation and full resin infiltration during cure). A flow front model was developed based on resin cure kinetics and rheological behavior, and then determined maximum dry space dimensions for semi-pregs under a range of realistic manufacturing conditions. Model predictions were validated in situ. Under controlled laboratory cure conditions, small surface openings (≤3.7 mm) resulted in full resin infiltration. Under adverse conditions (resin with accrued out-time), the maximum opening size dropped 40% (to ≤2.2 mm). Using a mathematical model, air evacuation time was calculated for various feature sizes using permeability measurements. Model predictions were tested and verified via fabrication of laminates. This methodology can be applied to other resin systems to guide vacuum-bag-only prepreg design and support robust production of composites.
format	article
author	Sarah G. K. Schechter Lessa K. Grunenfelder Steven R. Nutt
author_facet	Sarah G. K. Schechter Lessa K. Grunenfelder Steven R. Nutt
author_sort	Sarah G. K. Schechter
title	Air evacuation and resin impregnation in semi-pregs: effects of feature dimensions
title_short	Air evacuation and resin impregnation in semi-pregs: effects of feature dimensions
title_full	Air evacuation and resin impregnation in semi-pregs: effects of feature dimensions
title_fullStr	Air evacuation and resin impregnation in semi-pregs: effects of feature dimensions
title_full_unstemmed	Air evacuation and resin impregnation in semi-pregs: effects of feature dimensions
title_sort	air evacuation and resin impregnation in semi-pregs: effects of feature dimensions
publisher	Taylor & Francis Group
publishDate	2020
url	https://doaj.org/article/eaa183bae6b946328aeefb0ae221e008
work_keys_str_mv	AT sarahgkschechter airevacuationandresinimpregnationinsemipregseffectsoffeaturedimensions AT lessakgrunenfelder airevacuationandresinimpregnationinsemipregseffectsoffeaturedimensions AT stevenrnutt airevacuationandresinimpregnationinsemipregseffectsoffeaturedimensions
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Air evacuation and resin impregnation in semi-pregs: effects of feature dimensions

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