Effect of basalt intraply fiber hybridization on the compression behavior of filament wound composite pipes / Ö. Özbek in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 2 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 2 (2021) . - p. 193-204 Titre : Effect of basalt intraply fiber hybridization on the compression behavior of filament wound composite pipes Type de document : texte imprimé Auteurs : Ö. Özbek, Auteur ; Ö. Y. Bozkurt, Auteur ; A. Erklig, Auteur Année de publication : 2021 Article en page(s) : p. 193-204 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres de carbone -- Propriétés mécaniques Composites à fibres de verre -- Propriétés mécaniques Contraintes (mécanique) Epoxydes Fibres de basalte Résistance à la compression Tubes Index. décimale : 668.4 Plastiques, vinyles Résumé : The current study deals with the effect of basalt fiber hybridization on the compressive properties of composite pipes reinforced with glass fiber and carbon fiber. Hybrid and non-hybrid fiber reinforced pipes (FRPs) were fabricated through wet filament winding technique. Intraply fiber winding structure in which different fiber types were simultaneously wound at the layer was employed for the hybridization. The FRP samples wound by different fiber winding angles (± (40°), ± (55°), ± (70°)) were prepared in order to gain a better insight on the influence of basalt intraply fiber hybridization. The compression properties of FRP samples were experimentally determined by quasi-static compression tests using external parallel-plates for both the axial and radial directions. The non-hybrid carbon FRP pipes showed the maximum axial compression strength in parallel to the highest strength and lowest ductility of carbon fibers, while the minimum axial compression strength was obtained for the non-hybrid pipes reinforced with basalt fibers that, in comparison, exhibit much less strength and higher ductility. The pipes submitted to the axial compression tests predominantly failed due to the development of cracks and buckling along the fiber direction. While the inclusion of basalt fiber reduced the axial compression behavior of the non-hybrid carbon and glass FRP samples, it improved that behavior in the radial compression tests. Delamination was determined as the major failure mode for the damaged FRPs under radial compression. It is found that the incorporation of basalt fiber provides improvements in radial compression properties as opposed to axial compression properties and in the same manner the increment in fiber winding angle makes a positive contribution to radial compression properties. Note de contenu : - MATERIALS AND METHODS : Materials - Fabrication of composite pipes - Quasi-static axial and radial compression - RESULTS AND DISCUSSIONS : Compression strength - Pipe stiffness - Table 1 : The mechanical and physical properties of the raw materials - Table 2 : Naming and thickness of FW composite pipes - Table 3 : The parameters of the radial compression test DOI : https://doi.org/10.1515/ipp-2020-4005 En ligne : https://drive.google.com/file/d/1oiNVpI0FjCg5pJ1wsyBippVaxrjiYLEo/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36363 [article]

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Effects of hydrothermal seawater aging on the mechanical properties and water absorption of glass/aramid/epoxy hybrid composites / Z. A. Oguz in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 1 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 1 (2021) . - p. 79-93 Titre : Effects of hydrothermal seawater aging on the mechanical properties and water absorption of glass/aramid/epoxy hybrid composites Type de document : texte imprimé Auteurs : Z. A. Oguz, Auteur ; A. Erklig, Auteur ; Ö. Y. Bozkurt, Auteur Année de publication : 2021 Article en page(s) : p. 79-93 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aramides Les polyamides aromatiques, ou aramides, sont une classe de matériaux résistant à la chaleur et/ou présentant de bonnes propriétés mécaniques. Ils ne peuvent être utilisés que comme fibres, qui servent surtout à la fabrication de matériaux composites, en renfort de matrices. Le mot-valise "aramide" vient de la contraction de l'anglais aromatic polyamide. Les fibres sont obtenues par filage (étirage au travers d'une filière) à partir d'une dissolution. Les chaînes moléculaires sont fortement orientées dans le sens de l'axe de la fibre, de sorte que les forces des interactions moléculaires peuvent être exploitées pour la résistance thermique et/ou mécanique. Composites à fibres de verre Composites à fibres de verre -- Détérioration Détérioration hydrothermale Epoxydes Essais de résilience Humidité -- Absorption:Eau -- Absorption Index. décimale : 668.4 Plastiques, vinyles Résumé : With the increase in the diversity of applications, the effect of environmental conditions on the mechanical properties of polymeric composites have become more valuable due to the sensitivity of polymers to aging. In this study, an experimental investigation was carried out to study the seawater aging effect on the flexural and low-velocity impact behavior of glass/aramid/ epoxy hybrid composites. Four types of composite groups that are [G6]S, [A6]S, [G3A3]S, [A3G3]S manufactured by vacuum infusion method were immersed in seawater at 25 °C and 70°C for 1000 h. Mechanical tests were conducted under three different conditions, namely, dry, wet, re-dried. As temperature increases, the water gain ratio also increases for all composite groups. Flexural strength was significantly reduced with seawater absorption for the wet state tested groups at each temperature. The reductions in flexural strength of the re-dried test groups are less than in the wet state test samples. Charpy test results showed that as the composite groups were exposed to hydrothermal aging, the impact strength of the plain glass/ epoxy, GAG/epoxy, and AGA/epoxy hybrid composite decreased. SEM analysis showed that as temperature increases, delamination and fiber/matrix cracks also increases. Note de contenu : - MATERIALS AND METHODS : Materials and specimen fabrication - Hydrothermal aging - Flexural test - Charpy and notched impact tests - RESULTS AND DISCUSSION : Hydrothermal aging - Flexural tests - Low-velocity impact test - SEM and imagining results - Table 1 : Material properties - Table 2 : Thickness of produced composites - Table 3 : Sea water absorption parameters of composite groups - Table 4 : Flexural properties of the specimens - Table 5 : The increase/decrease of impact strength of composite groups En ligne : https://drive.google.com/file/d/1bLlKjBCBUytUFzY7_2AyQD_ZQvChxxcn/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36353 [article]

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