Efficient cocured scarf repair of composite structures through rheology modeling

To address the need for increased efficiency and high-quality in-field repair of composite structures, a vacuum bag only (VBO) semi-preg was produced, modeled, and evaluated against a conventional resin and format commonly used for repairs. The semi-preg featured a vinyl hybrid resin formulated for...

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Autores principales:	David B. Bender, Steven Nutt
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2021
Materias:	prepreg composites out-of-autoclave prepregs scarf repair rheology model Polymers and polymer manufacture TP1080-1185 Automation T59.5
Acceso en línea:	https://doaj.org/article/a24e4086c540418ba035bac21a7fedd3
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spelling	oai:doaj.org-article:a24e4086c540418ba035bac21a7fedd32021-12-02T15:15:54ZEfficient cocured scarf repair of composite structures through rheology modeling2055-035910.1080/20550340.2021.1952046https://doaj.org/article/a24e4086c540418ba035bac21a7fedd32021-04-01T00:00:00Zhttp://dx.doi.org/10.1080/20550340.2021.1952046https://doaj.org/toc/2055-0359To address the need for increased efficiency and high-quality in-field repair of composite structures, a vacuum bag only (VBO) semi-preg was produced, modeled, and evaluated against a conventional resin and format commonly used for repairs. The semi-preg featured a vinyl hybrid resin formulated for rapid processing with a discontinuous distribution of resin on the fiber bed. The format imparted high through-thickness air permeability relative to conventional out-of-autoclave (OoA) prepregs by virtue of abundant air evacuation pathways with short breathe-out distances. A model was developed to describe the rheological behavior of the resin, and then flow number analysis was employed to assess model accuracy and to guide the design of efficient cure cycles. A custom-built scarfed repair tool featuring an in situ observation window was employed to analyze the resin flow and cure process during a scarf repair. Microstructural quality and interlaminar shear strength were compared across the epoxy/vinyl hybrid and conventional/semi-preg panels. The results demonstrated that fast-cure resins can be used in conjunction with flow number analysis and semi-preg formats to design efficient VBO cure cycles that consistently yield patch repairs with low defect contents in repair environments.David B. BenderSteven NuttTaylor & Francis Grouparticleprepreg compositesout-of-autoclave prepregsscarf repairrheology modelPolymers and polymer manufactureTP1080-1185AutomationT59.5ENAdvanced Manufacturing: Polymer & Composites Science, Vol 7, Iss 2, Pp 15-24 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	prepreg composites out-of-autoclave prepregs scarf repair rheology model Polymers and polymer manufacture TP1080-1185 Automation T59.5
spellingShingle	prepreg composites out-of-autoclave prepregs scarf repair rheology model Polymers and polymer manufacture TP1080-1185 Automation T59.5 David B. Bender Steven Nutt Efficient cocured scarf repair of composite structures through rheology modeling
description	To address the need for increased efficiency and high-quality in-field repair of composite structures, a vacuum bag only (VBO) semi-preg was produced, modeled, and evaluated against a conventional resin and format commonly used for repairs. The semi-preg featured a vinyl hybrid resin formulated for rapid processing with a discontinuous distribution of resin on the fiber bed. The format imparted high through-thickness air permeability relative to conventional out-of-autoclave (OoA) prepregs by virtue of abundant air evacuation pathways with short breathe-out distances. A model was developed to describe the rheological behavior of the resin, and then flow number analysis was employed to assess model accuracy and to guide the design of efficient cure cycles. A custom-built scarfed repair tool featuring an in situ observation window was employed to analyze the resin flow and cure process during a scarf repair. Microstructural quality and interlaminar shear strength were compared across the epoxy/vinyl hybrid and conventional/semi-preg panels. The results demonstrated that fast-cure resins can be used in conjunction with flow number analysis and semi-preg formats to design efficient VBO cure cycles that consistently yield patch repairs with low defect contents in repair environments.
format	article
author	David B. Bender Steven Nutt
author_facet	David B. Bender Steven Nutt
author_sort	David B. Bender
title	Efficient cocured scarf repair of composite structures through rheology modeling
title_short	Efficient cocured scarf repair of composite structures through rheology modeling
title_full	Efficient cocured scarf repair of composite structures through rheology modeling
title_fullStr	Efficient cocured scarf repair of composite structures through rheology modeling
title_full_unstemmed	Efficient cocured scarf repair of composite structures through rheology modeling
title_sort	efficient cocured scarf repair of composite structures through rheology modeling
publisher	Taylor & Francis Group
publishDate	2021
url	https://doaj.org/article/a24e4086c540418ba035bac21a7fedd3
work_keys_str_mv	AT davidbbender efficientcocuredscarfrepairofcompositestructuresthroughrheologymodeling AT stevennutt efficientcocuredscarfrepairofcompositestructuresthroughrheologymodeling
_version_	1718387525752455168

Efficient cocured scarf repair of composite structures through rheology modeling

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