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Mechanical strength enhancement of natural fibre composites via localized hybridization with stitch reinforcement / M. Chithambara Thanu in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 5 (2023)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 5 (2023) . - p. 539-550 Titre : Mechanical strength enhancement of natural fibre composites via localized hybridization with stitch reinforcement Type de document : texte imprimé Auteurs : M. Chithambara Thanu, Auteur ; E. Fantin Irudaya Raj, Auteur ; Appadurai, Auteur ; Lurthu Pushparaj, Auteur Année de publication : 2023 Article en page(s) : p. 539-550 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Assemblages (technologie) Composites -- Propriétés interfaciales Composites à fibres végétales -- Propriétés mécaniques Essais dynamiques Renforts (matériaux) Résistance au cisaillement Index. décimale : 668.4 Plastiques, vinyles Résumé : Stress concentration is an unavoidable phenomenon during the fabrication of composite structures. This research focuses on reducing stress concentration. Circular holes made on the composite structural member induce stress-concentrated regions. These stress-concentrated regions around the circular hole (considered as a weak section) were strengthened by adding synthetic fibre (local hybridization) in the form of fibre stitches (locked loop stitch). Through conducting a single fibre pull-out test, the present study analysed the impact of incorporating synthetic fibres in stitch form and the enhancement of Interfacial Shear Strength (IFSS). The load acting on the broken warp fibres is distributed to the broken weft fibres when the number of concentric stitches increases. The increment of concentric stitches resulted in the increase of IFSS due to localized hybridization. The tensile test results also show a significant improvement with 110 Nmm axial fastening force, from 6.749 MPa (for the natural fibre composite) to 76.91 MPa (for locally hybridized with eight concentric stitches). A simple bolted lap joint with local hybridization around the hole has been evaluated for different clamp-up forces. The best combinations of the clamp-up force and the extent of hybridization have been identified. SEM images illustrate the reduced voids and the reduced fibre pull-out due to the local hybridization around delamination-prone areas. Note de contenu : - Literature survey - Experimental : Preparation of IFSS test specimens - Preparation of stitched lap joint test specimens - Results and discussion : IFSS calculation of the SCF/USPR composite - Tensile test results of stitched-reinforced lap joint specimens - Discussion on fractography - Table 1 : SCF/USPR composite sample’s nomenclature - Table 2 : Nomenclature of fastened lap joint tensile test specimens - Table 3 : Tensile test results of stitch reinforced circular hole fastened lap joints DOI : https://doi.org/10.1515/ipp-2023-4371 En ligne : https://drive.google.com/file/d/1aIwyMj42OCsIUKw0mcZ74kIYSzduvz07/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40287 [article]

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A comparative study on the mechanical properties of African teff and snake grass fiber-reinforced hybrid composites : effect of bio castor seed shell/glass/SiC fillers / K. Manickaraj in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 5 (2023)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 5 (2023) . - p. 551-563 Titre : A comparative study on the mechanical properties of African teff and snake grass fiber-reinforced hybrid composites : effect of bio castor seed shell/glass/SiC fillers Type de document : texte imprimé Auteurs : K. Manickaraj, Auteur ; R. Ramamoorthi, Auteur ; S. Sathish, Auteur ; A. Johnson Santhosh, Auteur Année de publication : 2023 Article en page(s) : p. 551-563 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Carbure de silicium Charges (matériaux) Composites à fibres végétales Composites à fibres végétales -- Propriétés mécaniques Fibres d'herbe à serpents Graines de ricin et constituants Teff et constituants Eragrostis tef, le teff ou tef, est une espèce de plantes monocotylédones de la famille des Poaceae (graminées), cultivée comme céréale secondaire en Afrique. Cette plante, originaire des hauts-plateaux d'Érythrée et Éthiopie, où elle est l'ingrédient de base de l’injera (sorte de crêpe) ou de la bière t'ella, a des graines de très petite taille ; on dit qu'une poignée suffit pour ensemencer un champ entier. Ces graines dépourvues de gluten sont précieuses pour les personnes tenues de suivre un régime sans gluten. (Wikipedia) Verre Index. décimale : 668.4 Plastiques, vinyles Résumé : The environmental awareness and sustainable nature of plant-based fibers have forced material researchers and automakers to use natural fibers instead of petroleum-based fibers for various industrial applications. The need for environmentally and biodegradable fibers has created a demand in the transportation industry. In this study, bio castor seed shell (C), glass fiber (G), and SiC (SC) fillers in a constant weight fraction (10 %) were reinforced separately with varying weight fractions (5–25 %) of African teff and snake grass fibers to improve the mechanical properties of the hybrid composites. Both African teff and snake grass fibers were subjected to alkaline treatment to remove amorphous elements such as hemicellulose, lignin, and wax, resulting in high surface roughness. The hybrid composites were fabricated by the compression molding technique and their mechanical properties were characterized as per ASTM standards. The fractured surface of the treated fiber was examined by scanning electron microscopy. From the results, it was found that SC10SG20AT showed maximum mechanical properties compared to C10SG20AT and G10SG20AT due to higher load-bearing capacity of SiC filler. Therefore, SC10SG20AT can be recommended for lightweight applications. Note de contenu : - Materials and methods : Materials - Development of composites - Mechanical, FTIR, and SEM analyses - Results and discussion : Tensile strength - Flexural strength - Impact strength - Interlaminar shear strength - Hardness - FTIR analysis - SEM - Table 1 : The designation of the developed composites DOI : https://doi.org/10.1515/ipp-2023-4343 En ligne : https://drive.google.com/file/d/1z-jmmXsdjZlTxmeyi8yxxpA_QKimbUQY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40288 [article]

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Mechanical characterization of randomly oriented short Sansevieria Trifasciata natural fibre composites / E. Fantin Irudaya Raj in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 5 (2023)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 5 (2023) . - p. 564-581 Titre : Mechanical characterization of randomly oriented short Sansevieria Trifasciata natural fibre composites Type de document : texte imprimé Auteurs : E. Fantin Irudaya Raj, Auteur ; Appadurai, Auteur ; Lurthu Pushparaj, Auteur ; M. Chithambara Thanu, Auteur Année de publication : 2023 Article en page(s) : p. 564-581 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Composites à fibres courtes Composites à fibres végétales -- Propriétés mécaniques Essais de résilience Essais dynamiques Flexion (mécanique) Impact (mécanique) Microscopie électronique à balayage Sansevieria et constituants Sansevieria est un genre de 70 espèces de plantes succulentes, généralement herbacées. Il appartient à la famille des Liliaceae (ou à celle des Dracaenaceae) selon la classification classique. Selon la classification phylogénétique ce genre fut classé dans la famille des Ruscaceae, mais avec la classification APG III (2009) cette famille est devenue invalide et ce genre est actuellement dans la famille des Asparagaceae. Le genre Sansevieria a été intégré au genre Dracaena suite à des études génétiques. Ces espèces sont originaires des régions tropicales d'Afrique ou parfois d'Asie. - Description : Les feuilles sont de forme triangulaire. Certaines espèces présentent des feuilles de 10 cm de large à la base et 15 cm de long. D'autres font 6 cm de large au plus et peuvent atteindre 2 m de haut et former des buissons. La floraison consiste en panicules dressées avec des petites fleurs blanches ou blanc-verdâtre très fragrante à la tombée du jour. Le fruit est une baie rouge ou orange. Certaines espèces de Sansevieria sont considérées comme plantes dépolluantes. Elles absorbent notamment le benzène, le formaldéhyde, le toluène, le trichloréthylène ou encore le xylène. (Wikipedia) Statistique Traction (mécanique) Index. décimale : 668.4 Plastiques, vinyles Résumé : The present work investigates the mechanical characteristics of randomly oriented short Sansevieria Trifasciata Fibre Polyester (STFP) composites. The STFP composites are fabricated using compression moulding methods with varying fibre weight percentages (5 %–50 %) and fibre lengths (5 mm–50 mm). It has been observed that the impact, flexural, and tensile strength of STFPs improve as the length of the fibre increases, up to a maximum of 40 mm. After that, these properties start to decrease as the length of the fibre further increases. Further, the analysis revealed that STFPs exhibited an increase in properties when the fibre weight percentage was less than 40 %, followed by a decrease in properties as the fibre percentage increased beyond that point. The impact strength of STFP is around 8.2 J/cm2. Similarly, the STFP has a flexural modulus and strength of about 3.4 GPa and 82.6 MPa, respectively. Lastly, the tensile strength of STFP is around 78.26 MPa, the elongation at break is between 6.25 % and 9.36 %, and the Young’s modulus is 11.8 GPa. The matrix and fibre interaction were examined by Scanning Electron Microscopy (SEM). Furthermore, Thermogravimetric (TGA) and Differential Scanning Calorimeter (DSC) analyses are carried out. From these analyses, the thermal stability of STFP is 200 °C and its activation energy is 65.48 kJ/mol. After a thorough comparison with other well-known natural fibres, the proposed properties of STFP demonstrate its superiority as a practical and effective natural fibre composite. Note de contenu : - MATERIALS AND EXPERIMENTATION : Material collection, preparation, and fabrication - Testing and analysis - RESULTS AND DISCUSSION : Density, porosity, and fibre wt% relationship - Mechanical properties of STF - Scanning Electron Microscopy (SEM) analysis - Thermal analysis - Comparison of STF with other commonly used natural fibres - STATISTICAL ANALYSIS - Table 1 : Comparison of STF with other commonly used natural fibres in architectural/ornamental applications - Table 2 : Analysis of variance DOI : https://doi.org/10.1515/ipp-2023-4377 En ligne : https://drive.google.com/file/d/1gQ8RDyrr4yyfmkA-i6VIbpxR_qs4OiWv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40289 [article]

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Mechanical and tribological properties of snake grass fibers reinforced epoxy composites : effect of Java plum seed filler weight fraction / Natarajan Ponnusamy in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 5 (2023)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 5 (2023) . - p. 582-592 Titre : Mechanical and tribological properties of snake grass fibers reinforced epoxy composites : effect of Java plum seed filler weight fraction Type de document : texte imprimé Auteurs : Natarajan Ponnusamy, Auteur ; Ponnusamy Rajasekaran, Auteur ; Manoharan Mohanraj, Auteur ; Shanmugam Devi, Auteur Année de publication : 2023 Article en page(s) : p. 582-592 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Charges (matériaux) Composites à fibres végétales -- Propriétés mécaniques Epoxydes Fibres d'herbe à serpents Fibres végétales -- Propriétés mécaniques Fibres végétales -- Propriétés physiques Graines de prunier de Java et constituants Réticulants Tribologie (technologie) Index. décimale : 668.4 Plastiques, vinyles Résumé : Natural fiber composite materials are able to compete with common synthetic materials in situations where the strength-to-weight ratio is important. In this study, we aim to analyze the mechanical, tribological, and surface morphology of composites fabricated from randomly oriented snake grass natural fiber with java plum seed filler. Different weight ratios of fiber to seed filler are chosen: 30:0, 28:2, 26:4, 24:6, 22:8, and 20:10. A 70 % epoxy resin was kept constant in all compositions. The fabricated hybrid composite samples were subjected to tensile, flexural, shear, Shore D hardness, water absorption, and wear tests as per ASTM standards, and the results were compared with those of snake grass mono fiber composites. The 20:10 composite has the maximum tensile strength, impact resistance, flexural strength, hardness, water absorption, and wear resistance compared to other composites. The fiber/matrix adhesion was explored using a scanning electron microscope (SEM). The 20:10 composite shows predominant mechanical and tribological characteristics, making it easier to utilize in structural and automotive applications. Note de contenu : - MATERIALS AND METHODOLOGY : Materials - Fiber extraction - Alkali treatment - Composite fabrication process - TESTING OF COMPOSITE MATERIALS : Water absorption - Hardness Tensile - Flexural - Impact - Wear - Morphology - RESULTS AND DISCUSSION : Water absorption behavior - Shore D hardness - Tensile properties - Flexural properties - Impact test - Specific wear rate and coefficient of friction - Surface morphology investigation of wear specimens - SEM analysis of flexural fractured specimens - Table 1 : Physical and mechanical properties of snake grass fiber - Table 2 : Properties of LY 556 epoxy resin - Table 3 : Chemical properties of hardner HY951 - Table 4 : Composite sample details DOI : https://doi.org/10.1515/ipp-2023-4376 En ligne : https://drive.google.com/file/d/1QuqGH_32knaz78nLhk3w75H1t36jJOfr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40290 [article]

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Chicken feather protein for the thermal stability and combustion performance of rigid polyurethane foam / Xu Zhang in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 5 (2023)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 5 (2023) . - p. 593-635 Titre : Chicken feather protein for the thermal stability and combustion performance of rigid polyurethane foam Type de document : texte imprimé Auteurs : Xu Zhang, Auteur ; Simiao Sun, Auteur ; Dehe Yuan, Auteur ; Zhi Wang, Auteur ; Hua Xie, Auteur ; Zhanpeng Su, Auteur Année de publication : 2023 Article en page(s) : p. 593-635 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Combustion Énergie d'activation L'énergie d'activation est la quantité d'énergie nécessaire pour lancer un processus chimique, le plus souvent une réaction. En effet, pour démarrer un processus, on doit souvent faire face à une barrière énergétique (c’est-à-dire apporter un minimum d'énergie pour le démarrage). Cette quantité est exprimée, selon le système international d'unités, en kJ/mol (kilojoules par mole de réactif). Mousses plastiques Mousses plastiques -- Propriétés thermiques Plumes Polyuréthanes Protéines animales Stabilité thermique Index. décimale : 668.4 Plastiques, vinyles Résumé : Rigid polyurethane foams (RPUFs) were synthesized with chicken feather protein using the “one-step method” of all-water foaming. Thermogravimetry, pyrolysis kinetics analysis, Cone calorimetry and smoke density (Ds) were used to investigate the effects of chicken feather protein on thermal stability and combustion performance of RPUFs. The results showed that the modified RPUFs with 2.5 wt% chicken feather protein (RPUF-CF1) had the lowest mass loss, the highest integrated program pyrolysis temperature, the highest activation energy, the lowest Ds (13.3), the highest light transmittance (79.3 %), the lowest heat release rate (22.0 kW/m2 and 30.6 kW/m2) and total heat release (2.4 MJ/m2 and 2.8 MJ/m2), which indicated that RPUF-CF1 had better thermal stability and combustion performance. The current research results provide a useful reference for the preparation of RPUFs with good thermal stability by bio-based modification. Note de contenu : - EXPERIMETAL : Materials - Preparation of chicken feather protein - Preparation of flame retardant RPUF - Measurements and characterization - RESULTS AND DISCUSSION : Thermal weight loss analysis - IPDT analysis - Pyrolysis kinetics analysis - Smoke density - Flame retardancy mechanism - Table 1 : Pyrolysis temperature parameters of the RPUFs - Table 2 : Ther thermal weight loss temeprature data of the RPUFs - Table 3 : Pyrolysis kinetic parameters of the RPUFs at different conversion rates with Flynn-Wall-Ozawa method - Table 4 : Pyrolysis kinetic data of the RPUFs with Coats Redfern method at different heating rates - Table 5 : Pyrolysis kinetic parameters of at three heating rated with Kissinger method - Table 6 : Pyrolysis kinetic parameters of RPUFs at different conversion rates witgh the Starink method - Table 7 : Combustion parameters of RPUFs at different radiation intensity DOI : https://doi.org/10.1515/ipp-2023-4364 En ligne : https://drive.google.com/file/d/1N_u4lH9uM6iUCqVv3ypfp9SKuUqJVXck/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40291 [article]

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Free vibration behaviour and some mechanical properties of micro particle reinforced epoxy composites / Meltem Ürer in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 5 (2023)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 5 (2023) . - p. 606-614 Titre : Free vibration behaviour and some mechanical properties of micro particle reinforced epoxy composites Type de document : texte imprimé Auteurs : Meltem Ürer, Auteur ; Aydin Demir, Auteur Année de publication : 2023 Article en page(s) : p. 606-614 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Carbure de bore Carbure de silicium Composites -- Propriétés mécaniques Epoxydes Essais dynamiques Graphite Particules (matières) Traction (mécanique) Vibrations (mécanique) Index. décimale : 668.4 Plastiques, vinyles Résumé : The epoxy composite specimens of certain sizes were produced by adding graphite, silicon carbide and boron carbide microparticles separately at the rates of 5, 10 and 15 wt% to the epoxy resin. Free vibrations of these composite samples were investigated experimentally in a simple supported vibration test setup. Frequency spectrums were obtained by modal analysis method in this experimental setup. The damping ratios were calculated using the half power bandwidth method. The mechanical properties of these composite specimens were also determined by applying the tensile test. By controlling the obtained vibration values theoretically, the effects of microparticle contributions to these specimens at certain rates on natural frequency and damping properties were investigated in detail. The maximum reduction in natural frequency was observed at 5 wt% of each reinforcement. Only the first natural frequency of the 15 wt% boron carbide reinforced epoxy composite was slightly increased. The damping ratio was increased at 10 wt% graphite added and 5 wt% boron carbide added epoxy composites compared to pure epoxy, but decreased in other composite specimens. Note de contenu : - MATERIALS AND METHODS : Vibration test - Tensile tests and mechanical properties - RESULTS AND DISCUSSIONS : Results on vibration properties - Results on mechanical properties - Table 1 : The first natural frequencies and damping ratios of the composite specimens - Table 2 : Some mechanical properties of the composite specimens DOI : https://doi.org/10.1515/ipp-2023-4379 En ligne : https://drive.google.com/file/d/144QslmJ6INymrGJ1ncldOlkVcco5uUme/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40292 [article]

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Polyvinylidene fluoride/maghnite nanocomposites : fabrication and study of structural, thermal and mechanical properties / Zoulikha Khiati in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 5 (2023)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 5 (2023) . - p. 615-624 Titre : Polyvinylidene fluoride/maghnite nanocomposites : fabrication and study of structural, thermal and mechanical properties Type de document : texte imprimé Auteurs : Zoulikha Khiati, Auteur ; Lahouari Mrah, Auteur Année de publication : 2023 Article en page(s) : p. 615-624 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse mécanique dynamique Analyse thermique Caractérisation Matériaux hybrides Matériaux hybrides -- Propriétés mécaniques Polyfluorure de vinylidène Viscosité Index. décimale : 668.4 Plastiques, vinyles Résumé : An in-depth study of polyvinylidene fluoride (PVDF) based nanocomposite systems will be the focus of this research. This polymer being hydrophobic and apolar, it will be unlikely to generate strong interactions with clay leaves called organophilic maghnite. The challenge of this study will therefore be to manage the load/polymer interfaces by using montmorillonite with specific surface treatments by adding a surfactant Cetyltrimethylammonium bromide. Therefore, a significant improvement in mechanical and thermal properties was observed. The properties of PVDFNC nanocomposites were evaluated using various physico-chemical techniques (XRD, FTIR, TGA, DSC, TEM, SEM). The results of the structural and thermal measurements carried out on these products reveal that the structural concept of the surfactant influences both the morphological profile, the thermal and mechanical properties of the nanocomposites obtained. Accelerated crystallization is observed in PVDNC nanocomposites as an effective nucleation agent, the crystals formed are predominantly β shaped and have a small number of polar α crystals. Measurements by X-ray diffraction, as well as transmission and scanning electron microscopy indicated that modified maghnite was perfectly distributed 3 % by weight in the polyvinylidene fluoride matrix. The mechanical properties of the nanocomposites were evaluated according to the filler material used and the polyvinylidene fluoride matrix. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of PVDFN nanocomposites - Characterization - RESULTS AND DISCUSSION : FTIR analysis - X-ray diffraction analysis - Transmission electron microscopy analysis - Scanning electron microscopy analysis - Optical microscopy - Thermogravimetric analysis - DSC - Index of fluidity (IF) - Dynamic mechanical thermal analysis (DMTA) - Mechanical properties - Table 1 : The mechanical properties of the polymer PVDF and its nanocomposites DOI : https://doi.org/10.1515/ipp-2022-4302 En ligne : https://drive.google.com/file/d/1HzmeWpX0XDfyOG9B3TOQk7Aygdcr1R30/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40293 [article]

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