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Mechanical properties of PMMA-based biocomposites with polyamide and polyvinylpyrrolidone blends for denture applications / Wassan S. Hussain in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 33, N° 5 (10/2023)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 33, N° 5 (10/2023) . - p. 293-302 Titre : Mechanical properties of PMMA-based biocomposites with polyamide and polyvinylpyrrolidone blends for denture applications Type de document : texte imprimé Auteurs : Wassan S. Hussain, Auteur ; Jawad K. Oleiwi, Auteur ; Qahtan A. Hamad, Auteur Année de publication : 2023 Article en page(s) : p. 293-302 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biomatériaux Composites Polyamide 6 Polyméthacrylate de méthyle Le 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. Polyvinylpyrrolidone Poudres Prothèses dentaires Index. décimale : 668.4 Plastiques, vinyles Résumé : By blending heat-cured polymethylmethacrylate (PMMA) resin with two different types of polymers, which are polyamide (PV) type (6) and polyvinylpyrrolidone (PVP) type (K30), added separately with various weight fractions (0, 2, 4 and 6%) to heat-cured PMMA resin as blend matrix, attempts have been made in this study for developing the PMMA resin properties employed for prosthesis complete denture. Sisal powder and coconut powder, two different types of natural powders, were added separately to the polymer blend matrices with varying weight fractions (2%, 4%, and 6%) to prepare composite specimens. Hand lay-up methods were used for preparing all specimens. This study covered the flexural test using the 3-point bending method, the impact test using the Izod method, and the maximum shear stress test using the 3-point bending method. According to the results, adding polymer blends and reinforcing powders boosts the impact strength, while lowering flexural modulus, flexural strength, and maximum shear stress. The composite specimens made of (PMMA-2% PVP-6% sisal) manifested the best impact strength and value (11.875 KJ/m2). These findings lead to the conclusion that using PMMA-based biocomposites with polyamide and polyvinylpyrrolidone blends improved impact strength for denture applications, which is one of the most important properties of these applications. Note de contenu : - EXPERIMENTAL WORK : Materials used - Salinization treatment - Preparation method of specimens - EXPERIMENTAL : Tests - Flexural test Impact test - Maximum shear strength test - RESULTS : Results of flexural text - Results of the impact strength and fracture toughness - Results of the maximum shear stress DOI : https://doi.org/10.18280/rcma.330503 En ligne : https://www.iieta.org/download/file/fid/113371 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40528 [article]

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Numerical simulation of asymmetric composite patch repair for fatigue damaged aluminum plate / Belaid Salim in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 33, N° 5 (10/2023)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 33, N° 5 (10/2023) . - p. 329-338 Titre : Numerical simulation of asymmetric composite patch repair for fatigue damaged aluminum plate Type de document : texte imprimé Auteurs : Belaid Salim, Auteur ; Babaghayou Meriam Imane, Auteur ; Maati Ahmed, Auteur Année de publication : 2023 Article en page(s) : p. 329-338 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aluminium -- Alliages Bore Colles:Adhésifs Composites Eléments finis, Méthode des Epoxydes Graphite Matériaux -- Fatigue Matériaux -- Fissuration Patchs de réparation Rupture (mécanique) Simulation par ordinateur Index. décimale : 668.4 Plastiques, vinyles Résumé : Repairing structures damaged by fatigue through the use of composite patch bonding is an efficient and economical process to preserve structures and increase their lifespan. Much work is currently being carried out to improve this technique. In this work, a 3D nonlinear numerical simulation by finite element analysis was carried out to study the behavior of the crack front and determine the evolution of the stress intensity factor and the change of stress with respect to distance from the crack point. for an aluminum alloy plate containing a central crack, repaired asymmetrically with a composite patch. The repair of these plates must be more precise and reinforced around the crack point, therefore the stress are high and the stress integrity factor SIF is more important according to the results of this study. Note de contenu : - LITERATURE REVIEW : Structural repair methods, composite patch bonding - Parameter of the break - METHODOLOGY : Software and simulation steps - Presentation of geometric models - The mesh module - RESULTS AND DISCUSSION : Crack behavior analysis - Effect of the mechanical properties of the adhesive - Boron/Epoxy patch simulation - Simulations Graphite/Epoxy - Patch results Stress variation during crack propagation - Table 1 : Dimensions and material properties of the repaired model - Table 2 : S11 and S-Mises stress along the path in the case of Boron/Epoxy patch - Table 3 : S11 and S-Mises along the path in the case of Graphite/Epoxy En ligne : https://www.iieta.org/download/file/fid/113375 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40529 [article]

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Mechanical properties of 3D-printed PETG samples : The effect of varying infill patterns / Osamah Fattah Taresh in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 33, N° 5 (10/2023)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 33, N° 5 (10/2023) . - p. 339-345 Titre : Mechanical properties of 3D-printed PETG samples : The effect of varying infill patterns Type de document : texte imprimé Auteurs : Osamah Fattah Taresh, Auteur ; Marwan T. Mezher, Auteur ; Entihaa G. Daway, Auteur Année de publication : 2023 Article en page(s) : p. 339-345 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Impression tridimensionnelle Matières plastiques -- Propriétés mécaniques Modèle de remplissage (technologie) Modélisation par dépôt en fusion Polyéthylène téréphtalate glycol Index. décimale : 668.4 Plastiques, vinyles Résumé : One of the most cost-effective additive manufacturing (AM)/3D printing techniques for complicated geometry components is fused deposition modeling (FDM). FDM is a method of fabricating parts by depositing successive layers of material in accordance with computer-aided design file. The properties of the finished products manufactured with FDM are sensitive to the process parameters used. Most FDM items still lack adequate mechanical characteristics when compared to those produced using conventional methods. This investigation seeks to address this knowledge gap by fabricating tensile specimens from Polyethylene Terephthalate Glycol (PETG) filament in a variety of geometries, including grids, octets, triangles, and hexagons. To verify this claim, samples studied was printed with varying infill percentages (25, 50, 75, and 100) % to see how this impacted the mechanical characteristics such as tensile strength and fractured strain. Although the best results for tensile stress and hardness were achieved with a 100% infill percentage in all four printing situations, the triangles orientation consistently produced the best results. Note de contenu : - Materials and Methods - Results and Discussions : Tensile strength - Fractured strain - Table 1 : The printing parameters of the different printing patterns DOI : https://doi.org/10.18280/rcma.330508 En ligne : https://www.iieta.org/download/file/fid/113413 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40530 [article]

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