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Effect of radiation-assisted cure on the functional properties of carbon-epoxy composites

2022Documento de Trabalho Acesso aberto
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datacite.subject.fosEngenharia e Tecnologia::Engenharia dos Materiais
datacite.subject.fosEngenharia e Tecnologia::Engenharia Mecânica
datacite.subject.fosEngenharia e Tecnologia::Engenharia Química
datacite.subject.fosEngenharia e Tecnologia::Outras Engenharias e Tecnologias
datacite.subject.sdg09:Indústria, Inovação e Infraestruturas
datacite.subject.sdg12:Produção e Consumo Sustentáveis
datacite.subject.sdg13:Ação Climática
datacite.subject.sdg07:Energias Renováveis e Acessíveis
datacite.subject.sdg08:Trabalho Digno e Crescimento Económico
dc.contributor.authorPaulino, Luís Filipe da Costa
dc.date.accessioned2026-05-05T19:13:50Z
dc.date.available2026-05-05T19:13:50Z
dc.date.issued2022
dc.descriptionResumo alargado da dissertação de mestrado com o mesmo título, defendida em 2002.
dc.description.abstractGamma radiation has been successfully used to improve polymer's properties. In this regard, this study aims to assess if it is possible to improve carbon-epoxy composites' mechanical and thermal properties, with potential application in aeronautics, through controlled exposition to gamma radiation. In addition, make a comparative study between post-cure irradiation and radiation-assisted cure. To accomplish this, the material is subjected to gamma radiation in different stages of the resin's cure. The laminates were fabricated with a 3K carbon mat with 160 g.m-2 and a two-component resin SR8200 with SD7206 hardener through wet-layup. The test specimens were cut from the laminate according to ISO 527-4/2020 and ISO 14125/2011. Finally, they were irradiated according to three irradiation methodologies: post-cure irradiation, irradiation after 2 days, and after 10 days with doses from 4 to 7 kGy. These doses were selected based on a preliminary study. The specimens were tested through tensile and flexural testing, thermogravimetry analysis and differential scanning calorimetry. The results showed that up to 6 kGy, the three irradiation methodologies improved the thermal stability and mechanical properties without affecting molecular structural integrity due to chain-scission, compared to non-irradiated specimens. The biggest increases registered were a 32.36 % increase in Young's modulus and a 51.23 % increase in flexural modulus for irradiation after 2 days, and an increase of 5.10 % in degradation temperature and 7.44 % in glass transition temperature for the same irradiation methodology, suggesting that radiation-assisted cure is more effective at improving the material's properties compared to post-cure irradiation.eng
dc.identifier.citationPaulino, L. F. C. (2022). Effect of radiation-assisted cure on the functional properties of carbon-epoxy composites. Unpublished manuscript.
dc.identifier.urihttp://hdl.handle.net/10400.26/62992
dc.language.isoeng
dc.peerreviewedn/a
dc.publisherAcademia da Força Aérea
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/
dc.subjectRadiation-assisted cure
dc.subjectCarbon-epoxy
dc.subjectComposites
dc.subjectCrosslinking
dc.subjectMechanical properties
dc.subjectThermal properties
dc.subjectCura assistida por radiação
dc.subjectCarbono-epóxi
dc.subjectCompósitos
dc.subjectReticulação
dc.subjectPropriedades mecânicas
dc.subjectPropriedades térmicas
dc.titleEffect of radiation-assisted cure on the functional properties of carbon-epoxy compositeseng
dc.title.alternativeEfeito da cura assistida por radiação nas propriedades funcionais de compósitos de carbono-epóxipor
dc.typeworking paper
dspace.entity.typePublication
oaire.versionhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43

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