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REVUE DES COMPOSITES ET DES MATERIAUX AVANCES . Vol. 31, N° 4Mention de date : 08/2021Paru le : 15/08/2021 |
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Ajouter le résultat dans votre panierA high frequency dielectric behavior modeling of a ReXTMnO2 ternary composite as an equivalent binary mixture / Abdelhalim Brahimi in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 31, N° 4 (08/2021)
[article]
Titre : A high frequency dielectric behavior modeling of a ReXTMnO2 ternary composite as an equivalent binary mixture Type de document : texte imprimé Auteurs : Abdelhalim Brahimi, Auteur ; Nacerdine Bourouba, Auteur ; Juan Pablo Martinez Jiménez, Auteur ; Nacerdine Bouzit, Auteur Année de publication : 2021 Article en page(s) : p. 181-191 Note générale : Bibliogr. Langues : Français (fre) Catégories : Composites -- Propriétés électriques
Diélectriques
Dioxyde de manganèse
Epoxydes
Modèles mathématiques
TitanatesLes titanates sont des composés inorganiques dont la composition combine un oxyde de titane à un autre oxyde. Le terme est parfois utilisé plus généralement pour tout composé comportant un anion du titane, par exemple [TiCl6]2− et [Ti(CO)7]2−.
On connaît un grand nombre de titanates, dont plusieurs ont une importance économique. Ce sont typiquement des matériaux blancs, diamagnétiques, à haut point de fusion et insolubles dans l'eau, que l'on prépare généralement à haute température (par exemple en utilisant un four tubulaire (en)) à partir de dioxyde de titane1.
Plusieurs titanates sont connus à l'état naturel, c'est-à -dire sous la forme de minéraux, dont les principaux sont l'ilménite FeTiO3 et la pérovskite CaTiO3.
Dans la quasi-totalité des cas, le titane a dans les titanates une coordination octaédrique (coordinence 6). Dans les cristaux de titanates il n'y a pas toujours un oxoanion du titane bien identifié (comme [TiO3]2− ou [TiO4]4−) mais souvent un cation Ti4+ ou des situations intermédiaires. (Wikipedia)Index. décimale : 668.4 Plastiques, vinyles Résumé : The goal of this paper is to study the dielectric behavior, in the ternary composites microwave domain, and simplifying ternaries models into binaries ones using time domain spectroscopy. We worked on three ternary composites made of epoxy resin (Re), manganese dioxide (MnO2) and one of three different titanates (XT): barium titanate (BT), calcium titanate (CT) or magnesium titanate (MT). These composites samples dielectric behavior is inspected over a frequency range from DC to 5 GHz. This aims to optimize the predictive modified Lichtenecker's law model (MLL) through a better smoothing shape factor making theoretical and experimental results very close to each other. The comparison between these results shows that the MLL model is pertinent for ternary mixtures (Re-XT-MnO2) with an appreciable accuracy degree. Another numerical approach applied to the Re-[Re-XT-MnO2] mixtures using a binary mixture model equivalent to the previous ternary one based on a simplified MLL expression and preserving the same mixture constituents. This model results are in good agreement not only with ternaries ones being modeled with this law but also with other modeling laws appreciated with binary composites. This study interest lies on these materials application in the telecommunications components miniaturization and in microwave electronic applications. Note de contenu : - Theoretical Foundations
- Experimental Protocol : Experimental apparatus - Measurement and parameters extraction procedure - Sample preparation
- Results and Discussion : Ternary composites : Dielectric permittivity determination - The new binaries : the proposed model validationDOI : https://doi.org/10.18280/rcma.310401 En ligne : https://www.iieta.org/download/file/fid/60225 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37671
in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 31, N° 4 (08/2021) . - p. 181-191[article]Delamination analysis of composite sandwich plate of cork agglomerate/glass fiber-polyester : an experimental investigation / Hocine Djemai in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 31, N° 4 (08/2021)
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Titre : Delamination analysis of composite sandwich plate of cork agglomerate/glass fiber-polyester : an experimental investigation Type de document : texte imprimé Auteurs : Hocine Djemai, Auteur ; Adnane Labed, Auteur ; Mabrouk Hecini, Auteur ; Tarek Djoudi, Auteur Année de publication : 2021 Article en page(s) : p. 193-197 Note générale : Bibliogr. Langues : Français (fre) Catégories : Analyse de dommages (matériaux)
Composites -- Délaminage
Composites à fibres de verre
Construction sandwich
Liège
Panneaux de fibres
PolyestersIndex. décimale : 668.4 Plastiques, vinyles Résumé : This paper presents an experimental investigation of damage in sandwich structures. These sandwich panels are result of the combination of glass-polyester as skins and cork agglomerate as core. For this purpose, delamination test (mode I) is carried on double cantilever beams (DCB) in sandwich beams. The initiation crack is characterized by toughness obtained from the determination of energy release rate (GIC) by modified beam theory method. The skins of these sandwiches are considered as orthotropic materials while the core as isotropic transverse material. The results show that, the energy release rate at the initiation of the crack of (DCB) specimens remains almost constant despite the variation of the initial crack, a good adhesion (skins - core) is also noticed. Note de contenu : - Table 1. Mechanical characteristics of the skins
- Table 2. Mechanical characteristics of the core
- Table 3. Average values of energy release rate (GIC)DOI : https://doi.org/10.18280/rcma.310402 En ligne : https://www.iieta.org/download/file/fid/60226 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37672
in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 31, N° 4 (08/2021) . - p. 193-197[article]Influence of nanofiller dispersion on electrical and mechanical properties of epoxy alumina nanocomposites / Neelmani in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 31, N° 4 (08/2021)
[article]
Titre : Influence of nanofiller dispersion on electrical and mechanical properties of epoxy alumina nanocomposites Type de document : texte imprimé Auteurs : Neelmani, Auteur ; Ramanujam Sarathi, Auteur ; Hisayuki Suematsu, Auteur ; Toshikatsu Tanaka, Auteur Année de publication : 2021 Article en page(s) : p. 217-225 Note générale : Bibliogr. Langues : Français (fre) Catégories : Agglomération (matériaux)
Alumine
Charges (matériaux)
Composites -- Propriétés électriques
Composites -- Propriétés mécaniques
Dispersions et suspensions
Elasticité
Epoxydes
Traitement coronaIndex. décimale : 668.4 Plastiques, vinyles Résumé : The electrical and mechanical properties of the epoxy alumina nanocomposites depend on the uniform dispersion of the nanofiller in the epoxy matrix. Epoxy alumina nanocomposites were prepared using 1, 3, and 5 wt% of alumina nanofiller, and electrical and mechanical properties were analyzed using experimental and modelling studies. Water droplet initiated corona inception voltage (CIV) was identified using fluorescence fiber technique and by Ultra High Frequency (UHF) technique, under AC and DC voltages. The CIV formed due to water droplet have reduced drastically with increase in number of droplets and fluorescent fiber technique found to be more sensitive to identify water droplet initiated discharges. A micro mechanical model was proposed to analyse the combined effect of the interphase and agglomeration properties of the alumina nanoparticles on the tensile strength of epoxy alumina nanocomposites. Variation in ϕagg, Eagg, and E were analysed by adopting the non-parametric distribution of alumina nanoparticles and Young’s modulus increased with the increment in the alumina nanofiller dispersion level. The presence of aggregated particles exhibits a negative effect on the tensile properties of nanocomposites. Note de contenu : - EXPERIMENTAL STUDIES : Raw materials, instruments and equipment - Preparation of epoxy alumina nanocomposites - Water droplet initiated discharge studies - Tensile test
- MODELLING OF THE YOUNG' MODULUS : Modulus - Classical models for evaluating Young’s modulus
- RESULTS AND DISCUSSION : Variation in water droplet initiated Corona inception voltage - Effect of interphase and agglomeration on the Young’s modulus - Effect of uniform dispersion of nanoparticles on the Young’s modulus
Table 1: Bandwidth for surface area distributionDOI : https://doi.org/10.18280/rcma.310405 En ligne : https://www.iieta.org/download/file/fid/60230 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37673
in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 31, N° 4 (08/2021) . - p. 217-225[article]Durability of road and bridge concrete and spray-coating waterproof material in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 31, N° 4 (08/2021)
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Titre : Durability of road and bridge concrete and spray-coating waterproof material Type de document : texte imprimé Année de publication : 2021 Article en page(s) : p. 227-235 Note générale : Bibliogr. Langues : Français (fre) Catégories : Copolymère éthylène acétate de vinyle
Dépôt par pulvérisation
Durée de vie (Ingénierie)
Imperméabilisation
Matériaux cimentaires
Mélanges (chimie)
Ponts -- Revêtements protecteurs
Routes -- Revêtements protecteursIndex. décimale : 667.9 Revêtements et enduits Résumé : Different from traditional waterproof methods for road and bridge concrete, the spray-coating waterproof material can effectively prevent rainwater and other corrosive liquids from entering the concrete structure, and it has a few functional advantages such as anti-carbonization, resistance to sulfate attack, and high elongation. Existing studies have discussed the impact of the microstructure of waterproof material on the structure of waterproof coating, the optimization of the mix ratios of waterproof material, and the influencing factors of the waterproof performance of waterproof material, etc., however, few researches have concerned about the mechanical properties of concrete after coated with the spray-coating waterproof material. Therefore, to fill in this research gap, this paper researched the durability of road and bridge concrete and the spray-coating waterproof material. At first, it analyzed the bridge deck water pressure and the internal force of the drain pipe structure under multiple drainage methods, and calculated the water pressure at the gutter inlet, the stress, and the permeability coefficient of the waterproof coating. Then, this paper elaborated on the experimental methods for measuring the durability of the road and bridge before and after coated with the spray-coating waterproof material, and introduced the methods for testing the waterproof material and the concrete. At last, this paper gave the corresponding experimental results, the analysis, and the conclusion. Note de contenu : - Simulation of road and bridge drainage before and after coated with the spray-coating waterproof material
- Experiment on the durability of roads and bridges before and after using the spray-coating waterproof material : Experimental methods of waterproof material - Experimental methods of concrete
- Experimental results and analysis :
- Table 1 : Physical and mechanical parameters of different parts of bridge
- Table 2. Orthogonal test results of water absorption rate of the waterproof material
- Table 3. Durability of the waterproof material under different compressive stress conditions
- Table 4. Correspondence between thickness and time
- Table 5. Calculation results of waterproof safety factor of the concrete structureDOI : https://doi.org/10.18280/rcma.310406 En ligne : https://www.iieta.org/download/file/fid/60464 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37674
in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 31, N° 4 (08/2021) . - p. 227-235[article]Experimental study of the effect of curing mode on concreting in hot weather / Nassima Bakir in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 31, N° 4 (08/2021)
[article]
Titre : Experimental study of the effect of curing mode on concreting in hot weather Type de document : texte imprimé Auteurs : Nassima Bakir, Auteur Année de publication : 2021 Article en page(s) : p. 243-248 Note générale : Bibliogr. Langues : Français (fre) Catégories : Humidité
Matériaux -- Effets du climat
Matériaux cimentaires -- Propriétés mécaniques
Matériaux cimentaires -- Séchage
Polyéthylène
Polymérisation
TempératureIndex. décimale : 668.9 Polymères Résumé :
Most developing countries have hot climate, ordinary jobsites characterized by reduced of human resources, equipment and infrastructures. The objective of this article is to make an experimental study of the influence of the hot climate such as that of Algeria, on the different properties of concrete in the fresh state, such as excessive water evaporation from the concrete surface, increased demand for water, increased slump loss corresponding to additional water on job-site, higher plastic shrinkage cracking and difficulty in controlling air content. At the hardened state, we could mention a reduction of strength at 28 days, decreased durability resulting from cracking at long-term period.
To show the problems linked to concreting under these conditions and to present the appropriate solutions concrete or mortar can withstand the conditions in which it is implemented. Thus, negative effects caused principally by hot weather concreting motivated the choice of the such study. The research experimental work conditions in which the cementitious matrix was kept concerned two different environments, namely hot and dry climate conditions (t = 40°, h = 0%) alike the climate of the region of M'sila., and that of a medium with a hot and humid environment (t = 40°, h = 100%). The output of the investigation demonstrated the crucial role of the cure method in hot regions. The comparison of results for a reference concrete kept in air without any curing measures with two curing types simulating hot weather environment of the region M’sila was undertaken. These obtained outcome results were discussed based on the influence of climatic conditions to conclude procedures for hot weather concreting and suitable cure methods.Note de contenu : - MATERIALS
- EQUIPMENT AND PROCEDURES : Equipment - Procedures - Tests carried out
- RESULTS AND DISCUSSION : Influence of curing methods on compressive and tensile strength Influence of storage conditions on compressive and tensile strength - Influence of curing and climatic storage conditions on the absorption of the mortar
- Table 1 : Chemical composition of the cement used
- Table 2 : Mineralogical composition of the cement used
- Table 3 : Storage conditions of the test piecesDOI : https://doi.org/10.18280/rcma.310408 En ligne : https://www.iieta.org/download/file/fid/60233 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37675
in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 31, N° 4 (08/2021) . - p. 243-248[article]Performance of athletic prosthetic feet made of various composite materials with pmma matrix : numerical and theoretical study / Hayder Kareem Talla in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 31, N° 4 (08/2021)
[article]
Titre : Performance of athletic prosthetic feet made of various composite materials with pmma matrix : numerical and theoretical study Type de document : texte imprimé Auteurs : Hayder Kareem Talla, Auteur ; Jawad Kadhim Oleiwi, Auteur ; Abdul Kareem F. Hassan, Auteur Année de publication : 2021 Article en page(s) : p. 257-264 Note générale : Bibliogr. Langues : Français (fre) Catégories : Composites à fibres de carbone -- Propriétés mécaniques
Composites à fibres de verre -- Propriétés mécaniques
Polyéthylène à ultra haut poids moléculaire
Polyméthacrylate de méthyleLe poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec.
Prothèses
Stratifiés -- Propriétés mécaniquesIndex. décimale : 668.4 Plastiques, vinyles Résumé : Prosthetic upgrades are specialized prosthetics that enable patients to participate in more demanding recreational activities, such as running. This study examines the use of prosthetic limbs, specifically the athletic prosthetic foot. The current research focused on the manufacturing and production properties of an samples athletic prosthetic Foot made from composite materials based on a polymethyl methacrylate resin (PMMA) reinforced with various fibers (UHMWPE, Perlon, Carbon fiber, and Glass fiber). The finite element method (ANSYS-19R) is used to build an athletic prosthetic model and apply boundary conditions to investigate the influence of deformation and stored energy on the performance of the sports prosthetic foot. Six laminates have been manufactured, and it has been discovered that adding a number of carbon fiber layers to UHMWPE has a better effect on deformation than adding a glass fiber 26% improvement. Furthermore, the findings show there is an improvement in performance when the number of classes was doubled, as the rate of improvement between the laminate to which carbon fibers were added was 31%, and between the laminate to which glass fibers were added by 32% under the same boundary conditions. Note de contenu : - Problem
- Description
- Experimental work : Material - Equipment
- Procedure
- Data reduction
- Numerical implementation : Mesh sizing
- Results and Discussion
- Table 1 : The mechanical properties of materials
- Table 2 : Types of laminations for laminated composite specimens in this study
- Table 3 : The mechanical properties of laminateDOI : https://doi.org/10.18280/rcma.310410 En ligne : https://www.iieta.org/download/file/fid/60236 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37676
in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 31, N° 4 (08/2021) . - p. 257-264[article]