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Effect of size and volume on the breaking properties of fragile materials : the case of laminate for orthopedic acrylic glass-perlon use / Sihem Achouri in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 32, N° 2 (04/2022)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 32, N° 2 (04/2022) . - p. 61-68 Titre : Effect of size and volume on the breaking properties of fragile materials : the case of laminate for orthopedic acrylic glass-perlon use Type de document : texte imprimé Auteurs : Sihem Achouri, Auteur ; Bachir Redjel, Auteur ; Mounira Bourebia, Auteur Année de publication : 2022 Article en page(s) : p. 61-68 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse de dommages (matériaux) Composites -- Propriétés mécaniques Implants orthopédiques Polyacryliques Polymères en médecine Probabilités Prothèses Rupture (mécanique) Stratifiés -- Rupture Weibull, Loi de En théorie des probabilités, la loi de Weibull, nommée d'après Waloddi Weibull en 1951, est une loi de probabilité continue. La loi de Weibull est un cas spécial de loi d'extremum généralisée au même titre que la loi de Gumbel ou la loi de Fréchet. Index. décimale : 668.4 Plastiques, vinyles Résumé : The stresses at break of fragile materials like acrylic resin and composite material for orthopedic use measured in bending are higher than those measured in direct traction. Tests on a composite material for orthopedic use laminated with 6 glass-perlon-acrylic layers (PV-2P-VP) for orthopedic use made it possible to identify its mechanical characteristics and to highlight the influence of the direction of cutting of the samples. The mechanical properties of this material indicate dispersion in the direction of the orientation of the molding which shows values of stress at break and of the Young's modulus which are reduced compared to the values measured in the perpendicular direction. The choice motivates the statistical approach which leads us to apply the Weibull model to assess the dangerousness of a stress in terms of probability of failure. The theoretical predictions are in good agreement with the experimental values. The morphological study of the fracture facies makes it possible to draw up an inventory of the various mechanisms at the origin of the damage and the rupture of these materials and thus to locate the most dominant. Note de contenu : - EXPERIMENTATION : Material used - Manufacture of acrylic resin test pieces - Machine and testing devices - Microscopic observations - RESULTS AND DISCUSSIONS : Examples of load-displacement and stress-strain curves - Weibull probabilistic model application units and numbers - Mechanisms of rupture and ruin - Table 1 : Measured values of the stress at break [MPa] - Table 2 : Mechanical characteristics of the composite studied - Table 3 : Report σrf /σrt theoretical and experimental DOI : https://doi.org/10.18280/rcma.320202 En ligne : https://www.iieta.org/download/file/fid/74278 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37697 [article]

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An investigation into the effect of adding carbon and glass fibres to UHMWPE fibres on the mechanical characteristics of a sports prosthetic foot / Hayder Kareem Talla in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 32, N° 2 (04/2022)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 32, N° 2 (04/2022) . - p. 69-76 Titre : An investigation into the effect of adding carbon and glass fibres to UHMWPE fibres on the mechanical characteristics of a sports prosthetic foot Type de document : texte imprimé Auteurs : Hayder Kareem Talla, Auteur ; Abdul Kareem F. Hassan, Auteur ; Jawad Kadhim Oleiwi, Auteur Année de publication : 2022 Article en page(s) : p. 69-76 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse numérique Appareils orthopédiques Composites à fibres de carbone -- Propriétés mécaniques Composites à fibres de verre -- Propriétés mécaniques Eléments finis, Méthode des Essais dynamiques Polyéthylène à ultra haut poids moléculaire Prothèses Stratifiés Index. décimale : 668.4 Plastiques, vinyles Résumé : Due to their qualities and advantages, such as light weight, high rigidity, and high performance, composite materials have been used in a wide variety of industries and sectors. For example, carbon fibres are used in the construction of aircraft, while ultrahigh-molecular-weight polyethylene (UHMWPE) is used in the fabrication of medical artificial joints. In this study, the blade dimensions were estimated using side profiles from a European patent specification and the mechanical properties of numerous layers of composite materials (UHMWPE, carbon, glass fibre, and Perlon) utilized in the fabrication of sports prosthesis were investigated experimentally, theoretically, and numerically, and the results were compared, as well as the theory of failure calculated. The influence of data entered into the ANSYS programme was also investigated in the case of isotropic or orthotropic materials. The findings indicate that longitudinal young modules are experimentally and theoretically equivalent. While the material ISO or Ortho is considered and its information is entered into the ANSYS programme for the same lamina, similar results are obtained under the same boundary condition, as was demonstrated when computing the theory of failure. Additionally, it was demonstrated in this research that layering woven carbon fibre on top of layers of UHMWPE woven fabrics had a greater effect than layering woven glass fibre when fabricating the sports prosthetic foot. Note de contenu : - MATERIALS AND METHODS : Materials chosen - Composite material production - Mechanical testing - DATA REDUCTION : Determination of fiber volume fraction Vf) - Determination of the elastic characteristics - FINITE ELEMENT MODELING - Table 1. Mechanical properties of composite fibers - Table 2. Mechanical properties of the Matrix - Table 3. Types of laminations used in this study for composite material specimens - Table 4. The theoretical property of lamination used in the current study - Table 5. The experimental young modulus of lamination employed in the current study - Table 6. The numerical stress at the x and y directions and shear stress - Table 7. Tsai-Hill results DOI : https://doi.org/10.18280/rcma.320203 En ligne : https://www.iieta.org/download/file/fid/74279 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37699 [article]

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The effect of alkali treatment and addition of microcrystalline cellulose (MCC) on physical and tensile properties of ramie/polyester laminated composites / Jamasri in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 32, N° 2 (04/2022)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 32, N° 2 (04/2022) . - p. 77-84 Titre : The effect of alkali treatment and addition of microcrystalline cellulose (MCC) on physical and tensile properties of ramie/polyester laminated composites Type de document : texte imprimé Auteurs : Jamasri, Auteur ; Ferriawan Yudhanto, Auteur Année de publication : 2022 Article en page(s) : p. 77-84 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules. Composites à fibres végétales -- Propriétés mécaniques Elasticité Essais dynamiques Fibres de ramie Polyesters Stratifiés -- Propriétés mécaniques Structure cristalline (solide) Traitement chimique Index. décimale : 668.4 Plastiques, vinyles Résumé : The aim of this research is to investigate the effect of alkali treatment of ramie fibers and addition of MCC on the properties of ramie/polyester laminated composites. The alkali treatment was performed using NaOH solution at a room temperature. The laminated composites was manufactured using a vacuum infusion method for three layers of treated woven ramie fibers in the polyester matrix. The MCC (microcrystalline cellulose) powder 0.5 wt.% was added into the polyester resin and then mixed by a mechanical stirrer at a rotation speed of 350 rpm for 5 minutes. The physical characterization was evaluated using FTIR, XRD, and SEM methods. The tensile test of a single fiber and laminated composites was carried out according to the ASTM D3379 and ASTM D3039, respectively. The experimental results show that the XRD of treated fiber with 5 wt.% NaOH solution has the highest crystallinity index of 66.3%. It impacts the increase of tensile strength and elastic modulus of single ramie fiber by 18% and 55%, respectively. The addition of MCC into the polyester matrix of laminated composite can increase the tensile strength and elastic modulus by 18% and 21%, respectively, compared to the untreated laminated composite. In addition, the treated fibers laminated composite can improve the adhesion and chemical bonding between fibers and polyester as a matrix. The addition of MCC filler may prevent the initial propagation of cracks on interlaminar surfaces of laminated composite. Note de contenu : - MATERIALS AND METHODS : Alkali treatments - X-Ray diffraction testFTIR (Fourier Transform Infra-Red) test - SEM (Scanning Electron Microscope) - Tensile test of a single ramie fiber Ramie/polyester laminate composite fabrication - Tensile test of laminated composite - RESULTS AND DISCUSSION : X-Ray diffraction analysis - FTIR (Fourier Transform Infrared) analysis of ramie fibers - Tensile strength of single ramie fiber - Tensile strength of ramie/polyester laminate composites (LC) - Photo SEM of ramie/polyester laminate composite after tensile test DOI : https://doi.org/10.18280/rcma.320204 En ligne : https://www.iieta.org/download/file/fid/74280 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37700 [article]

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Revue des composites et des matériaux avancés Vol. 32, N° 2 URL