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Experimental study of mechanical behaviour of renewable fibre reinforced composite materials type (Cynara cardunculus L/polyester) / Brahim Issasfa in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 30, N° 1 (02/2020)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 30, N° 1 (02/2020) . - p. 1-8 Titre : Experimental study of mechanical behaviour of renewable fibre reinforced composite materials type (Cynara cardunculus L/polyester) Type de document : texte imprimé Auteurs : Brahim Issasfa, Auteur ; Toufik Benmansour, Auteur ; Valéry Valle, Auteur ; Mustapha Bouakba, Auteur Année de publication : 2020 Article en page(s) : p. 1-8 Note générale : Bibliogr. Langues : Français (fre) Catégories : Cynara cardunculus Cynara cardunculus est un complexe d'espèces de plantes herbacées bisannuelles, de la famille des Astéracées, comprenant l'artichaut et le cardon (sauvage et cultivé), originaires du bassin méditerranéen. C'est en fait un membre amélioré de la grande famille des chardons. Essais dynamiques Fibres végétales -- Propriétés mécaniques Polyesters Traction (mécanique) 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 : This study is particularly focused on renewable materials of bio-composites. Our work draws on the extraction method and the mechanical characterisation of natural fibres of artichokes (Cyanara cardunculus L) which are produced naturally and in abundance in the northern regions of Algeria particularly so in the north-east. It also draws on the manufacturing of composite with bio-reinforcement models consisting of long fibres of laminated materials of the Cyanara cardunculus L type compiled with unsaturated polyester resin. Standardised sample test-pieces are then drawn from these models so as to carry out tensile and shear tests to evaluate their mechanical behaviour. Additionally, the diversity in characteristics necessitates the use of statistical approaches in order to estimate the proper Weibull parameters of natural fibres, based on a Weibull distribution. Note de contenu : - CYNARA CARDUNCULUS L - EXTRACTION OF FIBRES - MATERIALS AND METHODS : Mechanical characterisation of bio-fibres Cynara cardunculus - Elaboration of test-pieces characterisations of reinforced bio-sourced composite (polyester / fibre of Cynara cardunculus L) - Shear test of a short-beam composite - Quasi-static tensile tests - - RESULTS AND DISCUSSIONS : Microscopic view of the fibre cross section morphology - Tensile test of fibres - Statistical analysis (Weibull probability) - INSTALLATION AND LOADING OF THE SPECIMEN (SHORT BEAM) - RESULTS ANALYSIS OF TENSILE TESTS FOR FIBRE, RESIN AND COMPOSITES - Table 1 : Young’s Modulus and rupture-point stress after Weibull's criterion - Table 2 : Mechanical behaviour of different types of bio-fibres - Table 3 : Mechanical behaviour of fibre and composites DOI : https://doi.org/10.18280/rcma.300101 En ligne : https://www.iieta.org/download/file/fid/27095 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37583 [article]

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Cement mortar reinforced with palm nuts naturals fibers : study of the mechanical properties / Christian Bopda Fokam in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 30, N° 1 (02/2020)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 30, N° 1 (02/2020) . - p. 9-13 Titre : Cement mortar reinforced with palm nuts naturals fibers : study of the mechanical properties Type de document : texte imprimé Auteurs : Christian Bopda Fokam, Auteur ; Eric Toumi, Auteur ; Bienvenu Kenmeugne, Auteur ; Lucien Meva’a, Auteur ; Khalifa Mansouri, Auteur Année de publication : 2020 Article en page(s) : p. 9-13 Note générale : Bibliogr. Langues : Français (fre) Catégories : Composites à fibres végétales Durée de vie (Ingénierie) Matériaux cimentaires Mortier Noix de palme et constituants Index. décimale : 620.13 Matériaux de construction : pierre, ciment, béton, liants de Résumé : This paper presents an experimental study of the influence of the addition of palm nut fiber on the mechanical strength of cement mortar. Cement mortar specimens reinforced with naturals palm nut fibers have been developed containing between 0 and 3.5% volume fraction fibers. Compression test and flexural test (3-point bending test) are performed on the different samples. It is found from the flexural test that the flexural strength of the mortar reinforced with palm nuts increases slightly regardless of the maturation time of the sample. Conversely, compression tests show a gradual decrease in mechanical strength with the addition of fibers. Note de contenu : - MATERIALS AND EXPERIMENTAL TECHNIQUES : Biomaterial used in this study - Manufacture of fiber-reinforced cement mortar sample - Tensile/compression test machine - RESULTS AND DISCUSSIONS : Density of fiber cement mortar specimens - Analysis of flexural tests on fiber mortar specimens - Analysis of compressive tests on fibered mortar - Table 1 : Average size of extracted fibers - Table 2 : Fiber Composition of different cement mortar specimens DOI : https://doi.org/10.18280/rcma.300102 En ligne : https://www.iieta.org/download/file/fid/27096 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37584 [article]

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Study of modal behaviour of sandwich structure with various core materials - An analytical approach / Krishanu Gupta in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 30, N° 1 (02/2020)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 30, N° 1 (02/2020) . - p. 15-21 Titre : Study of modal behaviour of sandwich structure with various core materials - An analytical approach Type de document : texte imprimé Auteurs : Krishanu Gupta, Auteur ; Prasun Chakraborti, Auteur ; Chiranjit Bhowmik, Auteur Année de publication : 2020 Article en page(s) : p. 15-21 Note générale : Bibliogr. Langues : Français (fre) Catégories : Construction sandwich Déformations (mécanique) Géométrie Poutres Structure en nid d'abeilles Vibrations (mécanique) Index. décimale : 620.11 Matériaux (propriétés, résistance) Résumé : The present study comprises of different types of cored sandwich structures with different core geometries. A combination of materials of skins and cores were considered to investigate the free vibrational or modal behaviour on the core materials and geometries for the structure for illuminating the vibrational aspects for failures. Subsequently, the deformation for sandwich structures with various core geometries and materials was also studied. The objective of the article is to provide an essence of vibrational performance study of aluminium alloy for both skins, and the results were compared among core materials unlike materially configured sandwich structures of honeycomb core. Simulations of mode shapes were obtained using the free vibrational constraints. From this study, it was obtained that, two types of core geometries strictly imply that there is obvious effect of shape of core in sandwich beam vibrational characteristics of structure, as in the study. Lastly, the results obtained by using honeycomb core geometry of certain material was compared to regular rectangular geometrized core and found to have better results in terms of natural frequencies and maximum deformation of the later. Thus, findings may serve as a case for application of similar structures in engineering applications. Note de contenu : - THEORETICAL MODAL ANALYSIS - SANDWICH COMPONENTS MODELLING AND MATERIALS - MODAL BEHAVIOUR AND ANALYSIS : Mode shape analyses of sandwich panels - Table 1 : Material combination for sandwich beams - Table 2 : Material properties of skin and core - Table 3 : Dimensional considerations of sandwich panel - Table 4 : Maximum deformation at different modes DOI : https://doi.org/10.18280/rcma.300103 En ligne : https://www.iieta.org/download/file/fid/27103 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37585 [article]

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Computational modelling for specific heat and thermal conductivity of austenitic stainless steels alloys at solid phase / Abdel-Baset H. Mekky in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 30, N° 1 (02/2020)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 30, N° 1 (02/2020) . - p. 23-27 Titre : Computational modelling for specific heat and thermal conductivity of austenitic stainless steels alloys at solid phase Type de document : texte imprimé Auteurs : Abdel-Baset H. Mekky, Auteur Année de publication : 2020 Article en page(s) : p. 23-27 Note générale : Bibliogr. Langues : Français (fre) Résumé : This work studied the special effects of the temperature on a number of austenitic stainless steels that are AISI 316, 316L, 304, and 304L Alloys at a solid phase. JMATPRO®, a computer program for modeling of material properties was used to simulate these alloys. The validity of the mathematical model is established by comparing the simulation outcomes with the parallel experimental results. The thermal conductivity and the specific heat of solid-phase fundamentally change with temperature. Calculated specific heat capacity at room temperature agrees very well with Dulong-Petit prediction, but is significantly smaller than those in the literature. It is brought into being that the thermal conductivity and the specific heat basically increase with temperature increases. Generally, the simulation results offered in this study are found to be in good agreement with the experimental results. Thus, the validity and applicability of the JMATPRO® model are established. DOI : https://doi.org/10.18280/rcma.300104 En ligne : https://www.iieta.org/download/file/fid/27106 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37586 [article]

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Influence of mwcnts on the mechanical properties of continuous carbon epoxy composites / Jyothhi Yarlagaddaa in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 30, N° 1 (02/2020)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 30, N° 1 (02/2020) . - p. 35-41 Titre : Influence of mwcnts on the mechanical properties of continuous carbon epoxy composites Type de document : texte imprimé Auteurs : Jyothhi Yarlagaddaa, Auteur ; Ramakrishna Malkapuram, Auteur Année de publication : 2020 Article en page(s) : p. 35-41 Note générale : Bibliogr. Langues : Français (fre) Catégories : Caractérisation Composites à fibres -- Moulage par compression Composites à fibres de carbone -- Propriétés mécaniques Contraintes (mécanique) Enroulement Epoxydes Fibres continues Flexion (mécanique) Nanotubes de carbone à parois multiples Un nanotube de carbone multifeuillet est constitué de plusieurs feuillets de graphènes enroulés les uns autour des autres. Il existe deux modèles pour décrire la structure des nanotubes multifeuillets : - le modèle poupée russe: les plans de graphène sont arrangés en cylindres concentriques ; - le modèle parchemin: un seul feuillet de graphène est enroulé sur lui-même, comme une feuille de papier. Traction (mécanique) Ultrasons Index. décimale : 668.4 Plastiques, vinyles Résumé : The Carbon fiber reinforced epoxy composites finds wide range of applications in various fields such as aerospace, defence etc. The present study focuses on fabrication and mechanical characterization of different ply oriented Continuous Carbon Fibre reinforcedepoxy composites (CCFE). CCFE composites were fabricated using Drum winding, Hand Lay Up (HLU) followed by Compression Moulding with (0°)4, (0°/90°/0°/90°)4, (45°)4 orientations. Mechanical Characterisation was performed on the fabricated composites as per ASTM standards. CCFE with (0°/90°/0°/90°)4 orientation exhibited better compressive strength over other composites. 0.5,1.5 weight % of Multi Walled Carbon Nano-Tubes (MWCNTs) were reinforced in to the epoxy resin using ultrasonicator. The resin mixture with 0.5, 1.5 weight % of MWCNTs was used as matrix for the fabrication of (0°/90°/0°/90°)4 composites. Tensile, Compression, Flexural, Impact, Hardness and Water absorption tests were performed to investigate the effect of MWCNTs on (0°/90°/0°/90°)4 composites. CCFE samples with MWCNTs at 0.5% exhibited 1.63%, 5.23%, 16.47%, 3.9%, 29.6% increment in tensile strength, compressive strength, ILSS, impact strength, hardness, water absorptionand 36.9% decrement in flexural strength. DOI : https://doi.org/10.18280/rcma.300106 En ligne : https://www.iieta.org/download/file/fid/27104 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37587 [article]

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Revue des composites et des matériaux avancés Vol. 30, N° 1 URL