Effect of stacking sequence and thickness variation on the thermo-mechanical properties of flax-kenaf laminated biocomposites and prediction of the optimal configuration using a decision-making framework / Santosh Kumar in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 3 (2023)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 3 (2023) . - p. 404-423 Titre : Effect of stacking sequence and thickness variation on the thermo-mechanical properties of flax-kenaf laminated biocomposites and prediction of the optimal configuration using a decision-making framework Type de document : texte imprimé Auteurs : Santosh Kumar, Auteur ; Sumit Bhowmick, Auteur ; Divya Zindani, Auteur Année de publication : 2023 Article en page(s) : p. 404-423 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres végétales Composites à fibres végétales -- Propriétés mécaniques Epoxydes Interfaces (Sciences physiques) kénaf et constituants Le Kenaf (Hibiscus Cannabinus L. et Hibiscus Sabdarifa L.), aussi appelé chanvre de Deccan, est une plante annuelle de la famille des Malvaceae. Le kenaf est apparenté au jute. Ces tiges épineuses d'1 à 2 cm de diamètre sont souvent, mais pas toujours ramifiée. Les feuilles de 10 à 15 cm de longueur sont de forme variable, celles de la base sont lobées et celles du sommet lancéolées. Les fleurs de 8 à 15 cm de diamètre sont blanches, jaunes ou pourpres. Le fruit est un capsule contenant plusieurs graines. Lin et constituants Le lin cultivé (Linum usitatissimum) est une plante annuelle de la famille des Linaceae cultivée principalement pour ses fibres, mais aussi pour ses graines oléagineuses. Les fibres du lin permettent de faire des cordes, du tissu (lin textile pour ses qualités anallergiques, isolantes et thermorégulateurs), ou plus récemment des charges isolantes pour des matériaux de construction. Les graines sont utilisées pour produire de l'huile de lin pour l'industrie de l'encre et de la peinture, pour la consommation humaine et animale, à cause de sa richesse en oméga 3. Le lin est une des rares fibres textiles végétales européennes. Elle a comme caractéristiques la légereté, la rigidité et la résistance et comme particularité d'être une fibre longue (plusieurs dizaines de centimètres), par rapport aux fibres courtes (coton, chanvre) ou moyennes (laine). Stratifiés -- Propriétés mécaniques Index. décimale : 668.4 Plastiques, vinyles Résumé : The use of naturally derived eco-friendly biocomposites became more popular due to growing environmental concerns and hunt for sustainable materials. Biocomposites can reduce the residual waste and carbon emission to the environment during their lifecycle. The present study aims to develop biocomposites by reinforcing flax fiber (F) and kenaf fiber (K) laminates with bio-epoxy matrix at four different arrangements (FFF, FKF, KFK, and KKK). The biocomposite samples were fabricated with three laminated thicknesses (3 mm, 4 mm and 5 mm) and the thermo-mechanical performance was investigated. The results showed that FFF biocomposites recorded higher tensile, flexural, and interfacial properties with lower density and absorption of water compared to KKK biocomposites due to higher cylindrical lumen diameter of flax laminates. The hybridization of flax with kenaf fiber at different stacking sequences provided greater strength, modulus, toughness, stiffness, thermal stability and degradation behaviour due to greater interfacial interaction between laminated fiber and bio-epoxy. The FKF biocomposites showed maximum impact strength (52.96 kJ/m2), tensile strength (110.21 MPa), and compressive strength (139.64 MPa) at 5 mm laminated thickness while, flexural (158.67 MPa) and shear strength (39.45 MPa) were maximum at 4 mm thickness with the highest degradation temperature (336 °C). The optimal biocomposite configuration has been identified through employability of a novel decision-making framework encompassing interval-valued intuitionistic fuzzy sets, TOmada de DecisaoInterativaMulticriterio (TODIM) and Schweizer–Sklar operations. The inclusive evaluation with regard to the applied framework has revealed that FKF and KFK biocomposites with 4 mm thickness (Lam5 and Lam8) configuration to have the optimal configuration. On the other hand, Lam 10, i.e., KKK_3 mm turned out to be inferior to all the considered biocomposite configurations. Note de contenu : - MATERIALS AND METHODS : Materials processing - Biocomposite fabrication - Experimental testing of laminated biocomposites - The proposed decision support system - RESULTS AND DISCUSSION : Mechanical properties - Interfacial properties - Physical properties - Thermal degradation and stability - Surface morphology - APPLICABILITY OF THE PROPOSED DECISION-SUPPORT SYSTEM - Table 1 : Properties and chemical composition of raw materials - Table 2 : Properties and chemical composition of raw materials - Table 3 : Nomenclature of considered laminated biocomposites with evaluation scores from expert 1 - Table 4 : Conversion scale from linguistic IVIFNs - Table 5 : Aggregated matrix obtained using Schweizer–Sklar fuzzy TODIM metho - Table 6 : Importance weights and relative importance weights of the different performance metric DOI : https://doi.org/10.1515/ipp-2023-4341 En ligne : https://drive.google.com/file/d/15uqmEgc5Yf1chsFcmp4zMBIFsPQ0-xXo/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39702 [article]

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Establishment and effect of constraint on different mechanical properties of bamboo filler reinforced epoxy composites / R. Kumar in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 3 (07/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 3 (07/2017) . - p. 308-315 Titre : Establishment and effect of constraint on different mechanical properties of bamboo filler reinforced epoxy composites Type de document : texte imprimé Auteurs : R. Kumar, Auteur ; Sumit Bhowmick, Auteur ; K. Kumar, Auteur Année de publication : 2017 Article en page(s) : p. 308-315 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Charges (matériaux) Composites à fibres de verre -- Propriétés mécaniques Contraintes (mécanique) Fibres de bambous Index. décimale : 668.4 Plastiques, vinyles Résumé : With the growing apprehension about ecology and economics, the composite materials based on low-cost lignocellulosic biomass have generated a great interest of research. In this paper, a polymer composite has been developed using specific grade epoxy matrix and “particular micron size” bamboo filler and its different mechanical properties have been investigated. The mechanical properties were determined with a variation in different constraints like filler content, strain rate, temperature and chemical treatment to establish the applicability of the developed composite. From the results, it has been found that the static and dynamic mechanical properties of the developed composite are significantly influenced by the different parameters. The scanning electron micrographs demonstrated the even dispersion of particulate fillers in the matrix, agglomeration at higher filler loading and better adhesion due to alkali treatment. Also, the properties are comparable with the existing different bamboo based composite. Note de contenu : - MATERIALS AND EXPERIMENTAL DETAILS : Materials - Chemical treatment - Sample preparation - Void assessment test - Static and dynamic mechanical test - RESULTS AND DISCUSSION : Void content assessment - Dynamic mechanical properties DOI : 10.3139/217.3311 En ligne : https://drive.google.com/file/d/18TRQlCd2ktcSMQspjLFotJZwDi6r04B6/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28832 [article]

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Investigation of mechanical and tribological performance of wood dust reinforced epoxy composite under dry, wet and heated contact condition / Rajdeep Paul in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 2 (2024)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 39, N° 2 (2024) . - p. 186-201 Titre : Investigation of mechanical and tribological performance of wood dust reinforced epoxy composite under dry, wet and heated contact condition Type de document : texte imprimé Auteurs : Rajdeep Paul, Auteur ; Sumit Bhowmick, Auteur Année de publication : 2024 Article en page(s) : p. 186-201 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse morphologique Charges (matériaux) Composites à fibres végétales Composites à fibres végétales -- Propriétés mécaniques Epoxydes Essais accélérés (technologie) Humidité -- Absorption:Eau -- Absorption Poussière de bois Surfaces -- Analyse Tribologie (technologie) Index. décimale : 668.4 Plastiques, vinyles Résumé : Natural fibers have received a lot of attention from academia as well as industry in the context of sustainable materials. Since they are more environmentally friendly than traditional synthetic materials, their physico-mechanical and frictional properties such as porosity, moisture absorption, high strength, modulus, toughness, and wear resistivity make them appropriate for a variety of industrialized applications where issues involving a significant quantity of dumping must be taken into account. The paper introduces an attempt to use epoxy-based composites reinforced with wood dust for various applications. The composites are prepared with various wood filler stacks (0, 2.5, 5, 7.5, 10, and 12.5 wt%) embedded with epoxy resin and subjected to tensile and flexural testing. The highest ultimate tensile strength achieved at 7.5 wt% wood dust support is 22 MPa, whereas the highest flexural modulus is 0.48 GPa at 12.5 wt% composites. The composite’s wear properties is examined under dry, wet, and heated contact conditions using a pin-on-disk (POD) machine. In dry condition, coefficient of friction (COF) varies from 0.10 to 0.38 whereas, in wet condition, the value of COF decreased by 70–83 %. In heated state, the COF is increased by up to 15 % when varying the temperature from 40 °C to 80 °C. The composite exhibits better wear behavior in the lower filler support than in the higher filler support due to the sturdy connection between the matrix and filler. On the other hand, the wet state’s tribological performance is superior to the dry and heated states. During surface morphology analysis, it is found that various voids, crack formation, wear debris, and thin transfer layer formation take place on the composite. Note de contenu : - MATERIALS & METHODOLOGY : Filler preparation - Pre-treatment - Composite fabrication - CHARACTERIZATION TECHNIQUES : Mechanical properties - Wear testing - Surface morphology analysis - RESULTS AND DISCUSSIONS : Porosity fraction - Water absorption - Tensile attributes - Flexural characteristics - Wear and frictional performance - Surface morphology DOI : https://doi.org/10.1515/ipp-2023-4410 En ligne : https://drive.google.com/file/d/1y3f8kN9_X3DtWGDP0RWg-ldA0OjuLARr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40862 [article]

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