Process robustness and defect formation mechanisms in unidirectional semipreg

Out-of-autoclave/vacuum-bag-only (OoA/VBO) composite processing has emerged as an alternative to autoclave cure, addressing economic, environmental, and production flexibility limitations associated with autoclave production. VBO processing can produce defect-free components under ideal processing c...

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Autores principales:	William T. Edwards, Patricio Martinez, Steven R. Nutt
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2020
Materias:	prepreg semipreg through-thickness permeability robust manufacturing prepreg format design defect formation mechanism Polymers and polymer manufacture TP1080-1185 Automation T59.5
Acceso en línea:	https://doaj.org/article/fd661ccd6d72431eafd625fff761d50b
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spelling	oai:doaj.org-article:fd661ccd6d72431eafd625fff761d50b2021-12-02T12:03:53ZProcess robustness and defect formation mechanisms in unidirectional semipreg2055-035910.1080/20550340.2020.1834789https://doaj.org/article/fd661ccd6d72431eafd625fff761d50b2020-10-01T00:00:00Zhttp://dx.doi.org/10.1080/20550340.2020.1834789https://doaj.org/toc/2055-0359Out-of-autoclave/vacuum-bag-only (OoA/VBO) composite processing has emerged as an alternative to autoclave cure, addressing economic, environmental, and production flexibility limitations associated with autoclave production. VBO processing can produce defect-free components under ideal processing conditions; however, adverse process conditions (e.g. poor vacuum) commonly encountered in manufacturing environments result in unacceptably high scrap rates, preventing more widespread adoption of such techniques. This work explores how modifications to prepreg format can increase process robustness. A unidirectional (UD) prepreg was produced with a customized, discontinuous resin distribution, henceforth referred to as semipreg. The semipreg exhibited through-thickness permeability orders of magnitude greater than conventional hot-melt VBO prepregs. The semipreg also was less sensitive to variations in process conditions than conventional VBO prepreg. In situ process monitoring allowed observation and identification of two defect formation mechanisms arising during cure of the custom prepreg. Resin feature topography played a critical role in these mechanisms, indicating its importance to the design of next generation VBO semipregs.William T. EdwardsPatricio MartinezSteven R. NuttTaylor & Francis Grouparticleprepregsemipregthrough-thickness permeabilityrobust manufacturingprepreg format designdefect formation mechanismPolymers and polymer manufactureTP1080-1185AutomationT59.5ENAdvanced Manufacturing: Polymer & Composites Science, Vol 6, Iss 4, Pp 198-211 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	prepreg semipreg through-thickness permeability robust manufacturing prepreg format design defect formation mechanism Polymers and polymer manufacture TP1080-1185 Automation T59.5
spellingShingle	prepreg semipreg through-thickness permeability robust manufacturing prepreg format design defect formation mechanism Polymers and polymer manufacture TP1080-1185 Automation T59.5 William T. Edwards Patricio Martinez Steven R. Nutt Process robustness and defect formation mechanisms in unidirectional semipreg
description	Out-of-autoclave/vacuum-bag-only (OoA/VBO) composite processing has emerged as an alternative to autoclave cure, addressing economic, environmental, and production flexibility limitations associated with autoclave production. VBO processing can produce defect-free components under ideal processing conditions; however, adverse process conditions (e.g. poor vacuum) commonly encountered in manufacturing environments result in unacceptably high scrap rates, preventing more widespread adoption of such techniques. This work explores how modifications to prepreg format can increase process robustness. A unidirectional (UD) prepreg was produced with a customized, discontinuous resin distribution, henceforth referred to as semipreg. The semipreg exhibited through-thickness permeability orders of magnitude greater than conventional hot-melt VBO prepregs. The semipreg also was less sensitive to variations in process conditions than conventional VBO prepreg. In situ process monitoring allowed observation and identification of two defect formation mechanisms arising during cure of the custom prepreg. Resin feature topography played a critical role in these mechanisms, indicating its importance to the design of next generation VBO semipregs.
format	article
author	William T. Edwards Patricio Martinez Steven R. Nutt
author_facet	William T. Edwards Patricio Martinez Steven R. Nutt
author_sort	William T. Edwards
title	Process robustness and defect formation mechanisms in unidirectional semipreg
title_short	Process robustness and defect formation mechanisms in unidirectional semipreg
title_full	Process robustness and defect formation mechanisms in unidirectional semipreg
title_fullStr	Process robustness and defect formation mechanisms in unidirectional semipreg
title_full_unstemmed	Process robustness and defect formation mechanisms in unidirectional semipreg
title_sort	process robustness and defect formation mechanisms in unidirectional semipreg
publisher	Taylor & Francis Group
publishDate	2020
url	https://doaj.org/article/fd661ccd6d72431eafd625fff761d50b
work_keys_str_mv	AT williamtedwards processrobustnessanddefectformationmechanismsinunidirectionalsemipreg AT patriciomartinez processrobustnessanddefectformationmechanismsinunidirectionalsemipreg AT stevenrnutt processrobustnessanddefectformationmechanismsinunidirectionalsemipreg
_version_	1718394727962771456

Process robustness and defect formation mechanisms in unidirectional semipreg

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