Effective cure cycle development via flow optimization and advanced cure environments

Out-time and moisture absorption in prepregs are generally unavoidable in an industrial setting, where prepreg layup can take weeks. The resin cross-linking and viscosity increase that occurs during out-time can reduce resin flow during a specified cure cycle, causing porosity. In this study, a flow...

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Autores principales:	D. Kim, S. R. Nutt
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2020
Materias:	prepreg out-time out-of-autoclave (ooa) rheology viscosity Polymers and polymer manufacture TP1080-1185 Automation T59.5
Acceso en línea:	https://doaj.org/article/fda6999374d64dc7a2b5ea47fa32a4a4
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spelling	oai:doaj.org-article:fda6999374d64dc7a2b5ea47fa32a4a42021-12-02T10:26:59ZEffective cure cycle development via flow optimization and advanced cure environments2055-035910.1080/20550340.2020.1815276https://doaj.org/article/fda6999374d64dc7a2b5ea47fa32a4a42020-09-01T00:00:00Zhttp://dx.doi.org/10.1080/20550340.2020.1815276https://doaj.org/toc/2055-0359Out-time and moisture absorption in prepregs are generally unavoidable in an industrial setting, where prepreg layup can take weeks. The resin cross-linking and viscosity increase that occurs during out-time can reduce resin flow during a specified cure cycle, causing porosity. In this study, a flow-optimized cure cycle was developed, leveraging both flow level and time during out-of-autoclave (OoA) processing. First, predictive cure kinetics and viscosity models were used to model viscosity evolution under selected cure conditions, accounting for initial out-times and humidity conditioning. To quantify resin flow, an ‘effective flow number’ metric was defined as the integration of inverse viscosity evolution until the resin gelation point. The method described revealed that a rapid heating rate achieved by use of advanced tooling was essential to achieve a high effective flow number. The experimental results showed that the effective flow number is a useful criterion to limit flow-induced defects. The method presented also extends the boundary (by 175%) of the manufacturer’s specified out-life for OoA prepreg materials.D. KimS. R. NuttTaylor & Francis Grouparticleprepregout-timeout-of-autoclave (ooa)rheologyviscosityPolymers and polymer manufactureTP1080-1185AutomationT59.5ENAdvanced Manufacturing: Polymer & Composites Science, Vol 6, Iss 3, Pp 164-172 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	prepreg out-time out-of-autoclave (ooa) rheology viscosity Polymers and polymer manufacture TP1080-1185 Automation T59.5
spellingShingle	prepreg out-time out-of-autoclave (ooa) rheology viscosity Polymers and polymer manufacture TP1080-1185 Automation T59.5 D. Kim S. R. Nutt Effective cure cycle development via flow optimization and advanced cure environments
description	Out-time and moisture absorption in prepregs are generally unavoidable in an industrial setting, where prepreg layup can take weeks. The resin cross-linking and viscosity increase that occurs during out-time can reduce resin flow during a specified cure cycle, causing porosity. In this study, a flow-optimized cure cycle was developed, leveraging both flow level and time during out-of-autoclave (OoA) processing. First, predictive cure kinetics and viscosity models were used to model viscosity evolution under selected cure conditions, accounting for initial out-times and humidity conditioning. To quantify resin flow, an ‘effective flow number’ metric was defined as the integration of inverse viscosity evolution until the resin gelation point. The method described revealed that a rapid heating rate achieved by use of advanced tooling was essential to achieve a high effective flow number. The experimental results showed that the effective flow number is a useful criterion to limit flow-induced defects. The method presented also extends the boundary (by 175%) of the manufacturer’s specified out-life for OoA prepreg materials.
format	article
author	D. Kim S. R. Nutt
author_facet	D. Kim S. R. Nutt
author_sort	D. Kim
title	Effective cure cycle development via flow optimization and advanced cure environments
title_short	Effective cure cycle development via flow optimization and advanced cure environments
title_full	Effective cure cycle development via flow optimization and advanced cure environments
title_fullStr	Effective cure cycle development via flow optimization and advanced cure environments
title_full_unstemmed	Effective cure cycle development via flow optimization and advanced cure environments
title_sort	effective cure cycle development via flow optimization and advanced cure environments
publisher	Taylor & Francis Group
publishDate	2020
url	https://doaj.org/article/fda6999374d64dc7a2b5ea47fa32a4a4
work_keys_str_mv	AT dkim effectivecurecycledevelopmentviaflowoptimizationandadvancedcureenvironments AT srnutt effectivecurecycledevelopmentviaflowoptimizationandadvancedcureenvironments
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Effective cure cycle development via flow optimization and advanced cure environments

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