Hygrothermal Effect on Composites Under In-Plane Fatigue at Stress Ratios of R = −1 and R = 0.1: An Analysis of Quasi-Isotropic Stitched Carbon Fibers
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1007/s11665-018-3584-3 http://hdl.handle.net/11449/189828 |
Resumo: | The aeronautic structures normally operate under high levels of hygroscopic moisture from the surrounding environment at different temperature ranges while in service. Under such conditions, the behavior of laminate composite submitted to cyclic or static loadings can change drastically. In order to understand those effects in stitched fabrics, fatigue tests with open-hole specimens were carried out with a stress ratio of R = −1 and R = 0.1. The specimens were fatigue-tested as provided (environmental conditions) and after exposed to hygrothermal weathering conditions. Based on evidences from recent studies available in the open literature, e.g., effect of water diffusion on epoxy matrix, the overall results indicated a significant reduction in stiffness after the specimens are exposed to hygrothermal effects. The reduction in matrix stiffness, in this case, enhanced the fatigue strength in tension–tension load (R = 0.1) when compared to the specimens in normal conditions. The opposite occurs for the specimens loaded with stress ratio of R = −1, in which the delamination mechanisms changed during the loading reversion from tension to compression that promoted early delamination. Therefore, this process reduced the fatigue life of the specimens under hygrothermal condition. Then, by fractographic investigation, it was verified fracture patterns that regard to mode II damage in R = −1, in which mode II fracture toughness is known to decrease in the presence of water molecules. |
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Hygrothermal Effect on Composites Under In-Plane Fatigue at Stress Ratios of R = −1 and R = 0.1: An Analysis of Quasi-Isotropic Stitched Carbon Fibersfatiguehygrothermallaminatenon-crimp fabricThe aeronautic structures normally operate under high levels of hygroscopic moisture from the surrounding environment at different temperature ranges while in service. Under such conditions, the behavior of laminate composite submitted to cyclic or static loadings can change drastically. In order to understand those effects in stitched fabrics, fatigue tests with open-hole specimens were carried out with a stress ratio of R = −1 and R = 0.1. The specimens were fatigue-tested as provided (environmental conditions) and after exposed to hygrothermal weathering conditions. Based on evidences from recent studies available in the open literature, e.g., effect of water diffusion on epoxy matrix, the overall results indicated a significant reduction in stiffness after the specimens are exposed to hygrothermal effects. The reduction in matrix stiffness, in this case, enhanced the fatigue strength in tension–tension load (R = 0.1) when compared to the specimens in normal conditions. The opposite occurs for the specimens loaded with stress ratio of R = −1, in which the delamination mechanisms changed during the loading reversion from tension to compression that promoted early delamination. Therefore, this process reduced the fatigue life of the specimens under hygrothermal condition. Then, by fractographic investigation, it was verified fracture patterns that regard to mode II damage in R = −1, in which mode II fracture toughness is known to decrease in the presence of water molecules.Universidade Estadual Paulista (Unesp) - Instituto de Ciência e TecnologiaIEAMar/UNESP - Instituto de Estudos Avançados do MarDepartamento de Materiais e Tecnologia Fatigue and Aeronautic Materials Research Group Faculdade de Engenharia Universidade Estadual Paulista (Unesp)Fatec-Faculdade de Tecnologia de Pindamonhangaba, Caixa Postal 1Divisão de Engenharia Aeronáutica Instituto Tecnológico da Aeronáutica - ITA, Praça Marechal do Ar Eduardo Gomes, Vila das AcáciasUniversidade Estadual Paulista (Unesp) - Instituto de Ciência e TecnologiaIEAMar/UNESP - Instituto de Estudos Avançados do MarDepartamento de Materiais e Tecnologia Fatigue and Aeronautic Materials Research Group Faculdade de Engenharia Universidade Estadual Paulista (Unesp)Universidade Estadual Paulista (Unesp)Fatec-Faculdade de Tecnologia de PindamonhangabaInstituto Tecnológico da Aeronáutica - ITAShiino, Marcos Yutaka [UNESP]de Siqueira, Guilherme Silva Moraes [UNESP]Cioffi, Maria Odila Hilário [UNESP]Montoro, Sérgio RobertoDonadon, Maurício Vicente2019-10-06T16:53:29Z2019-10-06T16:53:29Z2018-11-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article5964-5972http://dx.doi.org/10.1007/s11665-018-3584-3Journal of Materials Engineering and Performance, v. 27, n. 11, p. 5964-5972, 2018.1544-10241059-9495http://hdl.handle.net/11449/18982810.1007/s11665-018-3584-32-s2.0-85055274258216095752915102521609575291510256119671014416126Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Materials Engineering and Performanceinfo:eu-repo/semantics/openAccess2024-07-02T15:03:34Zoai:repositorio.unesp.br:11449/189828Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T14:54:38.723781Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Hygrothermal Effect on Composites Under In-Plane Fatigue at Stress Ratios of R = −1 and R = 0.1: An Analysis of Quasi-Isotropic Stitched Carbon Fibers |
title |
Hygrothermal Effect on Composites Under In-Plane Fatigue at Stress Ratios of R = −1 and R = 0.1: An Analysis of Quasi-Isotropic Stitched Carbon Fibers |
spellingShingle |
Hygrothermal Effect on Composites Under In-Plane Fatigue at Stress Ratios of R = −1 and R = 0.1: An Analysis of Quasi-Isotropic Stitched Carbon Fibers Shiino, Marcos Yutaka [UNESP] fatigue hygrothermal laminate non-crimp fabric |
title_short |
Hygrothermal Effect on Composites Under In-Plane Fatigue at Stress Ratios of R = −1 and R = 0.1: An Analysis of Quasi-Isotropic Stitched Carbon Fibers |
title_full |
Hygrothermal Effect on Composites Under In-Plane Fatigue at Stress Ratios of R = −1 and R = 0.1: An Analysis of Quasi-Isotropic Stitched Carbon Fibers |
title_fullStr |
Hygrothermal Effect on Composites Under In-Plane Fatigue at Stress Ratios of R = −1 and R = 0.1: An Analysis of Quasi-Isotropic Stitched Carbon Fibers |
title_full_unstemmed |
Hygrothermal Effect on Composites Under In-Plane Fatigue at Stress Ratios of R = −1 and R = 0.1: An Analysis of Quasi-Isotropic Stitched Carbon Fibers |
title_sort |
Hygrothermal Effect on Composites Under In-Plane Fatigue at Stress Ratios of R = −1 and R = 0.1: An Analysis of Quasi-Isotropic Stitched Carbon Fibers |
author |
Shiino, Marcos Yutaka [UNESP] |
author_facet |
Shiino, Marcos Yutaka [UNESP] de Siqueira, Guilherme Silva Moraes [UNESP] Cioffi, Maria Odila Hilário [UNESP] Montoro, Sérgio Roberto Donadon, Maurício Vicente |
author_role |
author |
author2 |
de Siqueira, Guilherme Silva Moraes [UNESP] Cioffi, Maria Odila Hilário [UNESP] Montoro, Sérgio Roberto Donadon, Maurício Vicente |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Fatec-Faculdade de Tecnologia de Pindamonhangaba Instituto Tecnológico da Aeronáutica - ITA |
dc.contributor.author.fl_str_mv |
Shiino, Marcos Yutaka [UNESP] de Siqueira, Guilherme Silva Moraes [UNESP] Cioffi, Maria Odila Hilário [UNESP] Montoro, Sérgio Roberto Donadon, Maurício Vicente |
dc.subject.por.fl_str_mv |
fatigue hygrothermal laminate non-crimp fabric |
topic |
fatigue hygrothermal laminate non-crimp fabric |
description |
The aeronautic structures normally operate under high levels of hygroscopic moisture from the surrounding environment at different temperature ranges while in service. Under such conditions, the behavior of laminate composite submitted to cyclic or static loadings can change drastically. In order to understand those effects in stitched fabrics, fatigue tests with open-hole specimens were carried out with a stress ratio of R = −1 and R = 0.1. The specimens were fatigue-tested as provided (environmental conditions) and after exposed to hygrothermal weathering conditions. Based on evidences from recent studies available in the open literature, e.g., effect of water diffusion on epoxy matrix, the overall results indicated a significant reduction in stiffness after the specimens are exposed to hygrothermal effects. The reduction in matrix stiffness, in this case, enhanced the fatigue strength in tension–tension load (R = 0.1) when compared to the specimens in normal conditions. The opposite occurs for the specimens loaded with stress ratio of R = −1, in which the delamination mechanisms changed during the loading reversion from tension to compression that promoted early delamination. Therefore, this process reduced the fatigue life of the specimens under hygrothermal condition. Then, by fractographic investigation, it was verified fracture patterns that regard to mode II damage in R = −1, in which mode II fracture toughness is known to decrease in the presence of water molecules. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-11-01 2019-10-06T16:53:29Z 2019-10-06T16:53:29Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1007/s11665-018-3584-3 Journal of Materials Engineering and Performance, v. 27, n. 11, p. 5964-5972, 2018. 1544-1024 1059-9495 http://hdl.handle.net/11449/189828 10.1007/s11665-018-3584-3 2-s2.0-85055274258 2160957529151025 2160957529151025 6119671014416126 |
url |
http://dx.doi.org/10.1007/s11665-018-3584-3 http://hdl.handle.net/11449/189828 |
identifier_str_mv |
Journal of Materials Engineering and Performance, v. 27, n. 11, p. 5964-5972, 2018. 1544-1024 1059-9495 10.1007/s11665-018-3584-3 2-s2.0-85055274258 2160957529151025 6119671014416126 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Materials Engineering and Performance |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
5964-5972 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128434725978112 |