A comparison between a solid block made of concrete and others made of different composite materials / Emad Toma Karash in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 31, N° 6 (12/2021)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 31, N° 6 (12/2021) . - p. 341-347 Titre : A comparison between a solid block made of concrete and others made of different composite materials Type de document : texte imprimé Auteurs : Emad Toma Karash, Auteur ; Tymor Abed Alsttar Sediqer, Auteur ; Mohammad Takey Elias Kassim, Auteur Année de publication : 2021 Article en page(s) : p. 341-347 Note générale : Bibliogr. Langues : Français (fre) Catégories : Composites à fibres de carbone -- Propriétés mécaniques Composites à fibres de verre -- Propriétés mécaniques Contraintes (mécanique) Déformations (mécanique) Elasticité Eléments finis, Méthode des Etudes comparatives Fibres de carbone Fibres de verre Matériaux cimentaires Matériaux cimentaires -- Propriétés mécaniques Modèles mathématiques Solides Index. décimale : 668.4 Plastiques, vinyles Résumé : In this research, three mathematical models were designed, the first consisting of concrete, the second from carbon fiber, and the third from s-glass fiber, in order to compare the strength of composite materials to different stresses and deformations, because composite materials are better than concrete in terms of weight and shape and do not need to be applied to painting operations in addition to the fact that their thermal insulation is higher than Concrete in high proportions. From the results of the comparison, it was found that the second model was the best model in terms of bearing deformations, as the deformation percentage in it did not exceed the deformation of concrete a lot, reaching (17%), which is a very small percentage, and the stresses towards pregnancy for the second and third models were much better than the bearing of the first model, but the results indicate that the Von Mises Stress in the second model is higher than the first model by a percentage (57%), while the comparison of the third model with the first was the rate of increase percentage (47%). Note de contenu : - Materials and models analysis - Table 1 : Elastic characteristics of carbon fiber and fiberglass - Table 2 : Elastic characteristics of carbon fiber and fiberglass - Table 3 : Specifications used in building mathematical models in the ANSYS 15.0 program - Table 4 : Results of test first model (Concrete) by using ANSYS -15.0 program - Table 5 : Results of test second model (Carbon Epoxy) by using ANSYS -15.0 program - Table 6 : Results of test third model (S - Fiberglass) by using ANSYS -15.0 program DOI : https://doi.org/10.18280/rcma.310605 En ligne : https://www.iieta.org/download/file/fid/66504 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37691 [article]

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The amount of excess weight from the design of an armored vehicle body by using composite materials instead of steel / Majid Khaleel Najem in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 32, N° 1 (02/2022)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 32, N° 1 (02/2022) . - p. 1-10 Titre : The amount of excess weight from the design of an armored vehicle body by using composite materials instead of steel Type de document : texte imprimé Auteurs : Majid Khaleel Najem, Auteur ; Emad Toma Karash, Auteur ; Jamal Nayief Sultan, Auteur Année de publication : 2022 Article en page(s) : p. 1-10 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres de carbone -- Propriétés mécaniques Composites à fibres de carbone -- Propriétés thermiques Composites à fibres de verre -- Propriétés mécaniques Composites à fibres de verre -- Propriétés thermique Engins blindés Epoxydes Matériaux -- Allègement Index. décimale : 668.4 Plastiques, vinyles Résumé : In this paper, the amount of excess weight resulting from the design of a mathematical model composed of composite materials will be calculated and compared with a mathematical model of an armored steel structure. Five different models were designed, one of which is made of steel, the other part is made of composite materials, and a section of steel and composite materials, and then tested for resistance to stresses and compared the weight of each structure with that of the steel component by taking the maximum stress as a basic criterion for weight comparison. The results showed that the best model was the second model fiberglass, where the percentage of weight loss was compared to the steel model (73.77%), in addition to the wall thickness (62 mm) and the wall thickness of the steel model with which the comparison was (60 mm), but the displacement is (7. 24 mm), and in the steel model it is (1.827 mm). The best model compared to steel in terms of resistance to maximum stress, less displacement and less weight was the model consisting of steel with carbon fiber and its thickness was (47 layers& 57 mm, 2 layer & 10 mm steel and 45 layer & 45 mm carbon fiber), and the percentage of weight loss compared to the first mathematical model (60.96%). The results of this research may be a key to obtaining alternative materials for traditional materials in the manufacture of armored hulls, aircraft and ships, and it has a lower weight. Note de contenu : - Table 1 : The mechanical and thermal specifications of the materials used - Table 2 : The different stresses of the composite materials use - Table 3 : Specifications of codes, models, and type of elements for mathematical models in ANSYS 15.0 - Table 4 : Results of simulation test first model - Table 5 : Results of simulation test second model - Table 6 : Results of simulation test third model - Table 7 : Results of simulation test fourth model - Table 8 : Results of simulation test fifth model - Table 9 : The results of the five models' tests using DOI : https://doi.org/10.18280/rcma.320101 En ligne : https://www.iieta.org/download/file/fid/70886 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37693 [article]

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