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Enhancement of mechanical properties in glass-fiber woven reinforced hybrid composites for aerospace applications : An empirical investigation / Farouk Al-Attar Abeer in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 33, N° 6 (12/2023)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 33, N° 6 (12/2023) . - p. 347-355 Titre : Enhancement of mechanical properties in glass-fiber woven reinforced hybrid composites for aerospace applications : An empirical investigation Type de document : texte imprimé Auteurs : Farouk Al-Attar Abeer, Auteur ; Alaa Jaber Hussein, Auteur ; Mousa Hasan Ammar, Auteur Année de publication : 2023 Article en page(s) : p. 347-355 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alumine Analyse de variance En statistique, l'analyse de la variance (terme souvent abrégé par le terme anglais ANOVA : ANalysis Of VAriance) est un ensemble de modèles statistiques utilisés pour vérifier si les moyennes des groupes proviennent d'une même population. Les groupes correspondent aux modalités d'une variable qualitative (p. ex. variable : traitement; modalités : programme d'entrainement sportif, suppléments alimentaires ; placebo) et les moyennes sont calculés à partir d'une variable continue (p. ex. gain musculaire). Ce test s'applique lorsque l'on mesure une ou plusieurs variables explicatives catégorielles (appelées alors facteurs de variabilité, leurs différentes modalités étant parfois appelées "niveaux") qui ont de l'influence sur la loi d'une variable continue à expliquer. On parle d'analyse à un facteur lorsque l'analyse porte sur un modèle décrit par un seul facteur de variabilité, d'analyse à deux facteurs ou d'analyse multifactorielle sinon. (Wikipedia) Composites à fibres de verre Composites à fibres de verre -- Propriétés mécaniques Industries aérospatiales -- Matériaux Kaolin Matériaux hybrides Tissés Index. décimale : 668.4 Plastiques, vinyles Résumé : This experimental study aims to create innovative hybrid composites (HCs) for aerospace applications using the hand lay-up technique. Different volume fractions (Vf%) of distinctive natural (white clay (W) and red clay (R)) and synthetic (alumina (A) and woven glass fibers (E-GFW) reinforcing unsaturated polyester (UP). The mechanical and physical characterizations of these innovative HCs were estimated according to the American Society for Testing and Materials (ASTM) standards. The findings show that adding more white clay, red clay, and alumina to the HCs makes a big difference in improving their mechanical properties, such as Hardness Shore D (HSD), True Tensile Strength (Ttσ), Impact Strength (iσ), and Fracture Toughness (Kc). Analysis of variance (ANOVA) revealed noteworthy variations in the assessed parameters, emphasizing the potential suitability of these materials for aeronautical applications. This research contributes to the ongoing progress in material engineering, specifically in enhancing the mechanical resilience of composites utilized in the aerospace industry. Note de contenu : - Preparation of HCS - Physical investigations of HCS - Mechanical investigations of HCS : Hardness shore D (HSD) test - Tensile test - Bending test - Impact and fracture strength tests - Results and discussion : Physical investigations - Mechanical investigations - Analysis of variance (ANOVA) DOI : https://doi.org/10.18280/rcma.330601 En ligne : https://www.iieta.org/download/file/fid/115603 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40762 [article]

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Enhancing mechanical and thermal properties of unsaturated polyester resin with luffa fiber reinforcements : a volumetric analysis / Nafaa Hameed Sohaib in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 33, N° 6 (12/2023)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 33, N° 6 (12/2023) . - p. 357-362 Titre : Enhancing mechanical and thermal properties of unsaturated polyester resin with luffa fiber reinforcements : a volumetric analysis Type de document : texte imprimé Auteurs : Nafaa Hameed Sohaib, Auteur ; Bdaiwi Salih Waleed, Auteur Année de publication : 2023 Article en page(s) : p. 357-362 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres végétales -- Propriétés mécaniques Composites à fibres végétales -- Propriétés physiques Dureté (matériaux) Essais dynamiques Fibres de luffa Isolation thermique Polyesters insaturés Les résines de polyesters insaturés (UP) sont obtenues par polycondensation d’un ou de plusieurs diacides avec un ou plusieurs glycols, l’un, au moins, des constituants contenant une double liaison éthylénique susceptible de réagir ultérieurement sur un composé vinylique, acrylique ou allylique. Par le terme résine polyester, on désigne en fait la dissolution du prépolymère polyester insaturé dans un solvant copolymérisable, le plus utilisé étant le styrène. C’est sous cette forme liquide que les résines polyesters sont livrées aux transformateurs. Après addition de différents adjuvants, charges et renforts, divers procédés de transformation provoquent, sous l’action d’un système catalytique approprié, la copolymérisation finale de la résine en un objet thermodurcissable. Les polyesters insaturés sont d’un usage relativement ancien (1950), essentiellement dans le bâtiment (moulage au contact). Ils ont connu un renouveau important à partir de 1980, en particulier au niveau des formulations et de la fiabilité des procédés grâce au développement de technologies industrielles de moulage par injection et par compression dans l’industrie automobile. Résistance à la compression Résistance au chocs Thermocinétique Index. décimale : 668.4 Plastiques, vinyles Résumé : This study investigates the influence of Luffa Fiber (LF) inclusions on the mechanical and thermal characteristics of unsaturated polyester resin composites. LFs, manually extracted from luffa plants, are integrated at volumetric fractions of 10%, 15%, 20%, and 25% into the resin using a hand lay-up technique at ambient conditions. Subsequent machining prepares the samples for mechanical analysis. It is observed that mechanical properties enhance progressively with increased LF incorporation. The optimal impact resistance reaches 2.34KJ/m2, with maximum hardness and compressive strength values of 81.5N/mm2 and 43.9MPa, respectively. Concurrently, a notable reduction in thermal conductivity is evident, particularly at the 25% LF volume, where it measures approximately 0.105W/m.℃. These findings indicate that the LF-reinforced polyester composites exhibit potential for varied engineering applications. Particularly, their augmented mechanical robustness suits components such as sofa parts and door handles, while their improved thermal insulation properties render them suitable for building insulation. This investigation underscores the viability of LF as a reinforcing agent in polymeric composites, offering a balance of enhanced mechanical strength and thermal efficiency, thereby broadening the scope of their application in engineering domains. Note de contenu : - Materials used : The matrix material (unsaturated polyester) - Reinforcement material - Sample preparation - Mechanical tests : Impact test - Hardness test - The compression test - Physical properties : Thermal conductivity - Impact test - Hardness test - Compressive test - Thermal conductivity test - Table 1 : Experimental results of mechanical and physical tests DOI : https://doi.org/10.18280/rcma.330602 En ligne : https://www.iieta.org/download/file/fid/115604 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40763 [article]

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Enhancing geotechnical properties of clayey soil with recycled plastic and glass waste / Adnan Shakir Al-Mohammedi Amenah in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 33, N° 6 (12/2023)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 33, N° 6 (12/2023) . - p. 363-369 Titre : Enhancing geotechnical properties of clayey soil with recycled plastic and glass waste Type de document : texte imprimé Auteurs : Adnan Shakir Al-Mohammedi Amenah, Auteur ; Mohsen Seyedi, Auteur Année de publication : 2023 Article en page(s) : p. 363-369 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Matières plastiques -- Déchets Sols, Mécanique des Verre concassé Index. décimale : 668.4 Plastiques, vinyles Résumé : Expansive clay soils, characterized by their propensity to undergo significant volume changes in response to moisture variations, present considerable challenges in construction engineering. These challenges manifest as structural damage, including fractures, asymmetrical settlements, and erosion. This study investigates the application of sustainable waste materials, specifically a mixture of plastic and glass waste, as an innovative approach to soil stabilization. In the context of Anbar, Iraq, laboratory experiments were conducted to evaluate the efficacy of incorporating plastic and glass waste in various proportions (0%, 4%, 5%, 6%) into clayey soil. The primary focus was to assess changes in geotechnical properties, notably the reduction in swelling potential and alterations in the maximum dry unit weight of the soil. Results indicated that the inclusion of waste materials in the specified proportions significantly mitigated the soil's swelling behavior, with reductions of 2%, 3%, and 5% observed for the respective waste content. Concurrently, enhancements in soil density were recorded, with increases in the maximum dry unit weight by 4%, 5%, and 9% corresponding to the same proportions of waste additives. These findings underscore the potential of using recycled waste materials in soil stabilization, aligning with environmental sustainability goals through the repurposing of waste. Additionally, this approach offers an economically viable alternative to traditional stabilization methods. The utilization of waste materials not only addresses the environmental impact of construction activities but also contributes to the broader goal of waste management and resource conservation. Note de contenu : - Introduction : Classification of expansive soil - Glass and plastic waste - Materials and Methods : Testing methods - Materials - Results and Discussion : Atterberg limits test - Compaction parameters - Free swell - Swell pressure - Unconfined compressive strength (UCS) - Table 1 : Geotechnical engineering properties of the clayey soil - Table 2 : Engineering properties of the plastic waste - Table 3 : The glass waste's chemical composition - Table 4 : Summary of the tests results DOI : https://doi.org/10.18280/rcma.330603 En ligne : https://www.iieta.org/download/file/fid/115605 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40764 [article]

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Structural and mechanical characteristics of sustainable concrete composite panels reinforced with pre-treated recycled tire rubber / Abdulmohsin Khamees Ali in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 33, N° 6 (12/2023)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 33, N° 6 (12/2023) . - p. 371-378 Titre : Structural and mechanical characteristics of sustainable concrete composite panels reinforced with pre-treated recycled tire rubber Type de document : texte imprimé Auteurs : Abdulmohsin Khamees Ali, Auteur ; Waleed Ali Tameemi, Auteur ; Emadaldeen A. Sulaiman, Auteur ; Ali Abdulameer Al-Rammahi, Auteur Année de publication : 2023 Article en page(s) : p. 371-378 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caoutchouc -- Recyclage Composites Dalles en béton Granulats Matériaux cimentaires Matériaux hybrides -- Propriétés mécaniques Mélange Pneus -- Recyclage Produits et matériaux recyclés Index. décimale : 668.4 Plastiques, vinyles Résumé : The escalating environmental impact of non-biodegradable waste, particularly from discarded tires, necessitates innovative recycling strategies. This study explores the potential of incorporating pre-treated crumb rubber from waste tires into concrete mixtures as a sustainable alternative to traditional coarse aggregates. A comprehensive experimental investigation was conducted to evaluate the fresh-state properties, workability, and mechanical behavior of rubberized concrete. The study focused on varying proportions of pre-treated rubber particles, substituting 10%, 20%, 30%, and 40% of conventional coarse aggregates by volume. These rubber particles were treated with cement paste to enhance bonding strength within the composite material. Standard tests were employed to assess the properties of the rubberized concrete, including density, slump, and compressive strength. The findings reveal that the incorporation of recycled tire rubber as a partial aggregate replacement notably impacts the workability and mechanical properties of the concrete. However, this reduction is mitigated when a concrete superplasticizer is utilized. Furthermore, the research indicates a decrease in the failure load of rubberized concrete composite slabs, ranging from 15% to 58%, compared to those constructed with traditional aggregates. Additionally, a significant reduction in the initial cracking load was observed. These outcomes offer critical insights into the structural and mechanical implications of using pre-treated rubber particles in concrete. While the decrease in mechanical performance poses challenges, the study illuminates pathways for enhancing the sustainability of concrete through the innovative reuse of waste materials. This approach not only addresses environmental concerns but also opens new avenues for the development of more sustainable construction materials. Note de contenu : - Previous studies - Objectives of the current study - Materials - Mix proportion - Mixing procedure - Composite slab specimens description - Testing program - Results and discussion : Mechanical behaviour - Composite slab structural behaviour - Table 1 : Chemical and physical properties of ordinary Portland cement - Table 2 : Mixing proportions per cubic meter for SLWC and NWC - Table 3 : Mixing procedure for NWCs - Table 4 : Mixing procedure for rubberized concrete - Table 5 : Slump and unit weight for NC, NTRCs and PTRCs - Table 6 : The compressive behavior for cylinder and cube concrete specimens of NC and PTRCs - Table 7 : The flexural behavior for NC and PTRCs - Table 8 : The tensile behavior for NC and PTRCs - Table 9 : Specimens’ testing results DOI : https://doi.org/10.18280/rcma.330604 En ligne : https://www.iieta.org/download/file/fid/115606 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40765 [article]

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Thermal analysis and modification of C/C ablative composites for high-temperature insulation applications / Hamed A. Al-Falahi in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 33, N° 6 (12/2023)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 33, N° 6 (12/2023) . - p. 379-391 Titre : Thermal analysis and modification of C/C ablative composites for high-temperature insulation applications Type de document : texte imprimé Auteurs : Hamed A. Al-Falahi, Auteur Année de publication : 2023 Article en page(s) : p. 379-391 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Caractérisation Composites à fibres de carbone Graphitisation Hautes températures Isolants thermiques Isolation thermique Phénoplastes Index. décimale : 668.4 Plastiques, vinyles Résumé : This study focuses on the modification and thermal analysis of eight distinct carbon-carbon (C/C) composite types, designed as advanced thermal insulators. The investigation proceeded along two primary pathways. Firstly, an examination was conducted on the impact of phenolic resin modification, aimed at diminishing the erosion rate of these composites when exposed to an oxyacetylene flame. This involved integrating ammonia molecules with nickel ions in a complex, facilitating hydrogen-oxygen bonding, as evidenced by the pronounced broad band of hydroxyl (OH) groups in Fourier-transform infrared spectroscopy (FTIR) results. The presence of this nickel complex was observed to accelerate the graphitization level (GL). Secondly, a comprehensive thermo-mathematical analysis was undertaken on C/C models subjected to oxy-acetylene flames, utilizing the Finite Element Method (FEM) as simulated via the ANSYS software package. X-ray diffraction analysis conducted at 1650℃ revealed the presence of both graphite and turbostratic structures, designated as T&G. This signifies an enhanced GL in resins modified with 10 wt.% of the nickel complex Ni(CH2COCH2COCH3)2.2NH3, compared to those with 3 and 5 wt.% modifications. The effectiveness of modified C/C composites was found to be contingent on the specific type of additive and reinforcement used. Furthermore, a notable convergence between practical and mathematical analysis results was observed, establishing a reliable database for optimizing the selection of insulation type and thickness in practical applications. This investigation underscores the significance of chemical modifications in enhancing the thermal insulation properties of C/C composites. The findings hold substantial implications for the development of high-performance insulation materials, particularly in contexts demanding resistance to extreme temperatures and erosive environments. Note de contenu : - Experimental : Material and specimen preparation - Characterization of devices - Ablative test technique by oxy-acetylene flame - Results and Discussion : Nickel complex effect on the graphitization level of novalac by oxy-acetylene flame - Spectroscopy characterization by FT.IR - Ablative properties of C/C phenolic composites at oxy-acetylene flame - Transient thermal analysis (experimental and theoretical) - Discuss practical and theoretical results - Table 1 : Resin systems prepared - Table 2 : Most reliable parameters at different concentrations - Table 3 : The frequencies of non-modified and modified resin prepared (cm–1) - Table 4 : Effect of type of filler on the ablative and physical properties under oxy-acetylene flame at 1650℃ - Table 5 : Material properties of composites under test - Table 6 : Experimental and theoretical boundary conditions - Table 7 : Ablative parameters for carbon cloth-phenolic composites (group A) at 10 mm thickness - Table 8 : Ablative parameters for carbon cloth-phenolic composites (group A) at 10 mm thickness DOI : https://doi.org/10.18280/rcma.330605 En ligne : https://www.iieta.org/download/file/fid/115607 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40766 [article]

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Enhancement of optical properties in in2O3-doped PVA-PEG nanostructured films for optoelectronic applications / Dhay Ali Sabur in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 33, N° 6 (12/2023)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 33, N° 6 (12/2023) Titre : Enhancement of optical properties in in2O3-doped PVA-PEG nanostructured films for optoelectronic applications Type de document : texte imprimé Auteurs : Dhay Ali Sabur, Auteur ; Ahmed Hashim, Auteur ; Aseel Hadi, Auteur ; Majeed Ali Habeeb, Auteur ; Bahaa H. Rabee, Auteur ; Musaab Khudhur Mohammed, Auteur Année de publication : 2023 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alcool polyvinylique Couches minces -- Propriétés optiques Matériaux -- Propriétés optoélectroniques Nanostructures Oxyde d'indium L'oxyde d'indium(III) (In2O3) est un composé chimique, un oxyde amphotère d'indium. (Wikipedia) Polyéthylène glycol Index. décimale : 668.4 Plastiques, vinyles Résumé : In this investigation, nanostructured films comprising polyvinyl alcohol (PVA)/polyethylene glycol (PEG) blended with indium oxide (In2O3) nanoparticles were fabricated using a casting technique. The study focused on examining the impact of varying the ratios of PVA/PEG blend and In2O3 nanoparticle content on the optical properties of these nanostructures. Optical assessments were conducted across a spectrum ranging from 220 nm to 820 nm. It was observed that an increase in In2O3 nanoparticle concentration resulted in elevated absorbance levels in the PVA/PEG matrix, particularly within the ultraviolet spectrum, while simultaneously causing a decrease in transmittance. This effect was attributed to the interaction between the polymer matrix and the In2O3 nanoparticles, leading to altered electronic and photonic interactions within the material. A notable reduction in the energy band gap was also recorded with increasing In2O3 content, suggesting enhanced electron mobility and photon interaction within the nanostructures. These findings underscore the potential of In2O3-doped PVA/PEG films in optoelectronic applications, particularly in fields requiring controlled optical properties such as photonics and advanced optical systems. The improved optical parameters, specifically in terms of absorbance and band gap manipulation, highlight the versatility of these nanostructures in various optoelectronic applications. DOI : https://doi.org/10.18280/rcma.330606 En ligne : https://www.iieta.org/download/file/fid/115612 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40767 [article]

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