Bibliografie tematiche / Natural fibre reinforced composites

Letteratura scientifica selezionata sul tema "Natural fibre reinforced composites"

Autore: Grafiati

Pubblicato: 22 giugno 2024

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Articoli di riviste sul tema "Natural fibre reinforced composites":

Vedanarayanan, V., B. S. Praveen Kumar, M. S. Karuna, A. Jayanthi, K. V. Pradeep Kumar, A. Radha, G. Ramkumar e David Christopher. "Experimental Investigation on Mechanical Behaviour of Kevlar and Ramie Fibre Reinforced Epoxy Composites". Journal of Nanomaterials 2022 (2 febbraio 2022): 1–10. http://dx.doi.org/10.1155/2022/8802222.

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Natural fibre composites have been replacing synthetic fibre composites in practical applications for the last several years because of the features such as low densities, low weight, relatively inexpensive, recyclability, and excellent mechanical qualities unique to the substance. Thus, the current study examines how Kevlar/Ramie/Nano SiC hybrid fibre reinforced composites are made and their mechanical properties, and it compares them to those made using a single natural fibre reinforced composite. It was found that natural fibre composite densities and hardness were all within acceptable ranges by performing composites’ tensile and flexural strength tests. The hand-lay-up technique used ASTM standards samples to construct the composite specimens with various fibre weight percentages. Increase in mechanical characteristics was achieved by adding the glass and the epoxy fibres into the epoxy matrix. The hybrid composite’s performance is promising, especially those of individual fibre-reinforced composites.

S.F.K. Sherwani, E.S. Zainudin, S.M. Sapuan, Z. Leman e A. Khalina. "Recent Development of Natural Fibers Reinforced Polylactic Acid Composites". Journal of Research in Nanoscience and Nanotechnology 5, n. 1 (18 aprile 2022): 103–8. http://dx.doi.org/10.37934/jrnn.5.1.103108.

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The current research determines the most recent developments in natural fibres reinforced polylactic acid composites. Polylactic acid (PLA) is derived from renewable resources and is capable of degrading microorganisms, eliminating the pollution caused by petrochemical-based plastic. PLA is the most promising biodegradable material among biodegradable polymers since it is easily attacked by bacteria PLA decomposes easily, releasing H2O, CO2, and humus, the black material found in soil. PLA is a thermoplastic polymer that is widely used in the production of plastic bags, large planting cups, paper coating, fibres, films, packaging, and as a matrix material in composites. This review also discussed the physical and mechanical properties of several natural fibre reinforced polylactic acid composites. Several natural fibres have been used to reinforce PLA as a reinforcement for natural fibre composites in the field of composite manufacturing.

Sharma, Ritika, Akshay Joshi, Dimple e G. P. Singh. "TGA and Thermal Kinetics of Raw Calotropis Procera Fiber Reinforced PF Composites". Journal of Condensed Matter 1, n. 01 (1 giugno 2023): 24–27. http://dx.doi.org/10.61343/jcm.v1i01.6.

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Natural fibre-reinforced composites are used in various structurally designed goods, from civil engineering to the production of automobiles, thanks to qualities like minimal density, a favourable aspect ratio, biodegradability, and ease of fabrication. The thermal behaviour of natural fibres and composites has also been researched. The thermal degradation kinetics characteristics of composites made with phenol formaldehyde resin and reinforced with untreated Aak fibre with varying fibre loads have been determined using thermogravimetric analysis (TGA). The Flynn-Wall procedure determined each component and composite material's precise apparent activation energy (Ea). Varying fibre load (5, 10, 15, 20 wt.%) was used to reinforce PF resin, and TGA was taken for all composite samples. By observing TGA data composite with 15 wt% fibre load shows maximum thermal stability, it can also be concluded that the thermal stability of prepared composites increases with increasing fibre load. After 15 wt%, it starts to decrease.

Bhedasgaonkar, Rahul. "Manufacturing and Mechanical Properties Testing of Hybrid Natural Fibre Reinforced Polymer Composites". International Journal for Research in Applied Science and Engineering Technology 10, n. 6 (30 giugno 2022): 2390–96. http://dx.doi.org/10.22214/ijraset.2022.43877.

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Abstract: A composite material is a materials system made up of two or more micro or macro elements with different forms and chemical compositions that are largely insoluble in one another. It basically comprises of two phases: matrix and fiber. Polymers, ceramics, and metals such as nylon, glass, graphite, Aluminium oxide, boron, and aluminium are examples of fibres. In the present research work epoxy is used as matrix and Bamboo, Sugarcane Bagasse and Coconut fibre are used as fibres for preparing the composites. In the preparation of specimen, the fibre as taken as a continuous fibre. The fibre is treated with NaOH solution. Hybrid natural fibre reinforced composites of bamboo, sugarcane baggase and coconut coir has been prepared using hand lay-up process of composite manufacturing. These hybrid composites were tested for determining their tensile and impact strengths. Results of mechanical testing reveals that the tensile strength of Bamboo- Bagasse hybrid composite is more compared to other composites. Taking into consideration of enhanced tensile and impact strength of bamboo-bagasse hybrid natural fibre polymer composite, we recommend the use of hybrid bamboo-bagasse composite in manufacturing of automotive bodies. Because of their unique characteristics of recyclability, waste utilization, biodegradability, good strength, and a viable alternative to plastics, these composites can be used for a variety of applications

Edafiadhe, E. D., e N. E. Nwanze. "A comparative study on the tensile properties and environmental suitability of glass fibre/raffia palm/plantain fibres hybridized epoxy bio-composites". Journal of Engineering Innovations and Applications 1, n. 2 (30 agosto 2022): 32–39. http://dx.doi.org/10.31248/jeia2022.023.

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Bio-composites have been widely introduced as sustainable alternative engineering materials, due to their environmental friendliness. The aim of this study was to assess the variations in the mechanical and biodegradation behaviours of natural fibres (raffia palm and plantain fibres) reinforced composites, and compared them to artificial fibres composites. Bio-composite samples produced through hybridization of glass fibre, plantain fibre and raffia palm fibre, were tested (mechanical and biodegradability tests) in accordance with ASTM International accepted procedures. The biodegradability results indicated that, the tensile strength and tensile elongation for all composites decreased non-linearly during the 28 days of soil treatment. Also, it was observed that the mechanical properties of the natural fibres reinforced bio-composites declined faster, when compared to the synthetic fibre reinforced composite. The bio-composite produced solely with natural fibres (PFRF) had the highest tensile strength reduction rate (43.86%), while the composite produced with solely synthetic fibre (glass fibre) had the minimum tensile strength declining rate (2.18%), at the end of the soil treatment. Regarding the tensile elongation, the PFRF bio-composite had the highest decrement (89.98%), when compared to the 53.28 and 45.92% recorded in the CFPF and CFRF reinforced bio-composites, respectively. With respect to weight loss, it was observed that the weight loss was gradual during the initial period of the soil treatment. However, the bio-composite with the two natural fibres (PFRF) exhibited more pronounced weight loss (46.4%); while the sample with the synthesized fibre (CF) exhibited more resistance to biodegradation (6.23% weight loss). The study results demonstrated that plantain fibre and raffia fibre are environmentally friendly, and composites produced from them developed appreciable tensile properties; hence, they can be used to produce composite for automobile parts.

Zaleha, M., M. Shahruddin e I. Maizlinda Izwana. "A Review on the Mechanical and Physical Properties of Natural Fiber Composites". Applied Mechanics and Materials 229-231 (novembre 2012): 276–81. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.276.

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Research on the use of natural fibers as replacement to man-made fibre in fiber reinforced composites have received more interest and opened up further industrial possibilities. Natural fibre presents many advantages compared to synthetic fibers which make them attractive as reinforcements in composite material. They come from abundant and renewable resources, which ensures a continuous fibre supply and a significant material cost saving to the plastics, automotive and packaging industries. The paper reviews the previous and current research works published in the field of natural fiber reinforced composite material with special reference in mechanical properties of the natural fiber reinforced composite.

Dong, Chensong. "Review of natural fibre-reinforced hybrid composites". Journal of Reinforced Plastics and Composites 37, n. 5 (3 dicembre 2017): 331–48. http://dx.doi.org/10.1177/0731684417745368.

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Natural fibre-reinforced hybrid composites which contain one or more types of natural reinforcement are gaining increasing research interest. This paper presents a review of natural fibre-reinforced hybrid composites. Both thermoplastic and thermoset composites reinforced by hybrid/synthetic fibres or hybrid/hybrid fibres are reviewed. The properties of natural fibres, the properties and processing of composites are summarised.

Venkatarramaniah, Durgunti, Kanthi Madhu, Endabetla David, Kudikala Jayanth, Pallapu Kumar e Chelpuri Chandu. "Investigation of Mechanical Properties of Natural Fiber Reinforced Hybrid Composite". International Journal for Research in Applied Science and Engineering Technology 12, n. 5 (31 maggio 2024): 1527–34. http://dx.doi.org/10.22214/ijraset.2024.61906.

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Abstract: Hybrid composite is a material composed of matrix and two or more reinforcements. Two or more reinforcements in hybrid composite replace the limitation of conventional composites by providing uniform strength to thematerial. Recently, natural fibers reinforced hybrid composites are gaining increased interest due to the encouraging properties of natural fibers such as high strength to weight ratio, low cost, no harm to environment etc. Many studies dealt with natural fibers based composite reported that the hybrid composites has the potential to replace glass fiber based composites and to reduce the weight of conventional composite. This project reports on the manufacturing of the Indian elm and Acacia fibre reinforced epoxy composite laminate as per the ASTM (American Society for Testing and Materials) Standards. This laminate consists of matrix and reinforcement. Epoxy is used as a structural matrix material which is then reinforced by Indian elm fiber, combining Acacia fibres with resin matrix results in composites that are strong, lightweight, corrosion-resistant and dimensionally stable. They also provide good design flexibility, high dielectric strength and act as inflammable materials. Their tremendous strength-to-weight and design flexibility make them ideal in structural components for the aerospace industry. In this project the Indian elm and Acacia fibre reinforced epoxy composite is manufactured into two different parts each having ratios of Indian elm and Acacia fibre to epoxy resin as 60:40, 40:60 respectively and are compared for ultimate tensile strength, impact strength, hardness strength and flexural strength of the material by conducting experiment such as tensile test, flexural test, hardness test and impact test.

Jyani, Kanchan, G. P. Singh, Pritika Jay Banshiwal e Ritika Sharma. "A Comprehensive Review of Natural Fibre Reinforced Polymer Composites". Journal of Condensed Matter 1, n. 02 (1 dicembre 2023): 21–26. http://dx.doi.org/10.61343/jcm.v1i02.11.

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The idea of composite materials is introduced in this article, with an emphasis on composites made of natural fibres and polymers. Composites are made up of various elements or phases that significantly affect the material's general characteristics. The matrix, the continuous phase, is typically made up of ceramics, metals, or polymers. Natural fibres that provide strength and stiffness make up the reinforcement component in natural fibre-reinforced composites. These composite materials have uses in the consumer goods, packaging, sports, and construction industries, in addition to providing environmental advantages. The paper presents a review of the literature on the creation and characterization of composites reinforced by natural fibres. To improve the mechanical, thermal, and chemical properties of the composites, numerous studies have looked at various kinds of natural fibres, surface modifications, coupling agents, and processing methods. The benefits and drawbacks of using natural fibres in composites are discussed in the article. It gives a general overview of how natural fibre-reinforced polymer composites have evolved and what uses they might have in the future. The article highlights current research initiatives and difficulties in enhancing the performance and compatibility of natural fibres with polymer matrices. The research advances the use of natural fibre composites as environmentally friendly substitutes across a range of industries by fostering a better understanding of their advantages and disadvantages.

Kumar, Sanjeev, Lalta Prasad, Vinay Kumar Patel, Virendra Kumar, Anil Kumar, Anshul Yadav e Jerzy Winczek. "Physical and Mechanical Properties of Natural Leaf Fiber-Reinforced Epoxy Polyester Composites". Polymers 13, n. 9 (22 aprile 2021): 1369. http://dx.doi.org/10.3390/polym13091369.

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In recent times, demand for light weight and high strength materials fabricated from natural fibres has increased tremendously. The use of natural fibres has rapidly increased due to their high availability, low density, and renewable capability over synthetic fibre. Natural leaf fibres are easy to extract from the plant (retting process is easy), which offers high stiffness, less energy consumption, less health risk, environment friendly, and better insulation property than the synthetic fibre-based composite. Natural leaf fibre composites have low machining wear with low cost and excellent performance in engineering applications, and hence established as superior reinforcing materials compared to other plant fibres. In this review, the physical and mechanical properties of different natural leaf fibre-based composites are addressed. The influences of fibre loading and fibre length on mechanical properties are discussed for different matrices-based composite materials. The surface modifications of natural fibre also play a crucial role in improving physical and mechanical properties regarding composite materials due to improved fibre/matrix adhesion. Additionally, the present review also deals with the effect of silane-treated leaf fibre-reinforced thermoset composite, which play an important role in enhancing the mechanical and physical properties of the composites.

Più fonti

Tesi sul tema "Natural fibre reinforced composites":

Rao, Sanjeev. "Manufacture of cellular solids using natural fibre reinforced composites". Thesis, University of Auckland, 2009. http://hdl.handle.net/2292/5813.

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This thesis explains the manufacturing of recyclable, eco-friendly composites and their fabrication into hollow cores. The composites have been manufactured using compression moulding and extrusion techniques; each representing batch manufacturing and continuous manufacturing respectively. A statistical design of experiments based on Taguchi method has been used to study the multivariable system involved in the process of continuous extrusion. Factorial design of experiments (DoE) has been used to determine the best material formulation to obtain maximum mechanical properties. The composite sheets produced after the DoE were pelletised in a hammer mill and reprocessed by passing them through another cycle of extrusion. The effect of recycling on the mechanical properties, which were determined by performing static tests as per ASTM standards, has been investigated. The extruded composite sheets have been thermoformed into half-hexagonal and sinusoidal profiles using matched-die and roll forming processes. As the process involves bending and stretching the sheet to conform to the geometry of the mould, it is usually accompanied by large strains. These strains have been analysed using grid strain analysis, and the strain path taken during the forming operation has been determined using strain space diagrams. Due to the stretching and bending of the composite sheet during thermoforming process, a stress field is induced in the material, which upon extraction in that state, would result in either spring-forward or spring-back of the material causing dimensional instability, but by holding the part in that deformed state for a period of time will allow the stresses in the materials to relax. This time-stress information (stress relaxation behaviour) has been experimentally investigated and modelled using springs and dashpots arranged in series and parallel. The spring-back and spring-forward phenomena, occurring in the formed part upon de-moulding, have been investigated using single curvature vee-bending experiments. The profiled sheets obtained after forming have been assembled and bonded into honeycomb cores using adhesives and ultrasonic methods. These cores have been sandwiched between two wood veneer facings to form eco-friendly sandwich panels. The compressive and shear properties of these sandwich panels have been modelled and experimentally investigated. The compressive behaviour of the sisal-PP honeycomb cores has been modelled considering the honeycomb cell wall as a linear elastic specially orthotropic plate/lamina under plane stress and as a quasi-isotropic material. A finite element model of the sandwich panel has been developed in ANSYS classic finite element environment, to study the behaviour of the panel and the core, under flexural loading. Some non-structural properties such as, sound absorption, structural damping and energy absorption have been experimentally determined. The sound absorption ability of the honeycomb has been experimentally evaluated using a standing plane wave impedance tube. Three configurations; one with hollow cores, and the other two filled with polyurethane foam and wood fibres, respectively have been tried. The natural frequencies and structural damping have been experimentally determined by subjecting the sandwich beam to harmonic vibrations. The energy absorption characteristic has been experimentally determined by subjecting the honeycomb cores to quasi-static compressive loading.

Jabeen, Rowshni. "Laser transmission welding of natural fibre reinforced thermoplastic composites". Electronic Thesis or Diss., Ecole nationale supérieure Mines-Télécom Lille Douai, 2022. http://www.theses.fr/2022MTLD0011.

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Le soudage par transmission laser des thermoplastiques nécessite l’optimisation de l’adhérence interfaciale au niveau du joint de soudure. A cet égard, la modélisation du procédé et le développement d'outils de simulation numériques sont indispensables pour optimiser la résistance mécanique du joint de soudure. La tâche est plus difficile dans le cas de matériaux composites très hétérogènes et anisotropes. De plus, la transmission laser est encore difficile dans le cas de milieux opaques ou semi-transparents tels que les composites thermoplastiques renforcés de fibres naturelles. Les propriétés thermiques et optiques des composites dépendent des propriétés et de la morphologie des constituants tels que les fibres et le polymère, qui peuvent affecter le spectre de transmission dans le domaine infrarouge. L’absorption et la réfraction de la propagation du rayon laser dans les matériaux composites conduisent à une réduction de l’énergie transmise arrivant à l’interface da soudure, ce qui influence directement la qualité de la soudure et ses performances mécaniques.Dans cette thèse, l'effet des phénomènes d'absorption et de diffusion sur le développement du champ de température à l'interface de la soudure est analysé numériquement et expérimentalement. Compte tenu de l’orientation, de la forme, de la longueur et de la fraction volumique des fibres, des géométries numériques 3D représentant les matériaux composites sont générées pour simuler la propagation des rayons laser avec l'algorithme "Ray tracing". Des modèles numériques pour estimer la résistance de la soudure sont présentés tout en tenant compte de l'influence des paramètres de soudage (tels que la puissance du laser, la vitesse d’alimentation et la position du foyer), les propriétés du matériau et l'interdiffusion moléculaire à l'interface de la soudure. La résistance de la soudure est mesurée par des essais mécaniques et leurs résultats sont comparés aux résultats de la modélisation numérique
Laser transmission welding of thermoplastics requires the optimisation of interfacial adhesion at the weld joint. In this regard, the process modelling, and the development of numerical simulation tools are indispensable to optimize the mechanical strength of the weld joint. The task is more difficult in the case of highly heterogeneous and anisotropic composite materials. Moreover, the laser transmission is still difficult in the case of opaque or semi-transparent media such as natural fibre reinforced thermoplastic composites. The thermal and optical properties of composites depend on the properties and morphology of the constituents such as fibres and polymer, which can affect the transmission spectrum in the infrared range. The absorption and refraction of laser ray propagation in the composite materials lead to a reduction of the transmitted energy arriving at the weld interface, which directly influences the quality of the weld and its mechanical performance. In this dissertation, the effect of absorption and diffusion phenomena on the development of temperature field at the weld interface is analysed numerically and experimentally. Considering the fibre orientation, shape, length and volume fraction, numerical 3D geometries representing composite materials are generated to simulate the propagation of laser rays with “Ray tracing” algorithm. Numerical models to estimate the strength of weld are presented while considering the influence of welding parameters (such as laser power, feeding speed and focus position), material properties and molecular interdiffusion at the weld interface. The weld bonding strength is measured by mechanical tests and their results are compared with numerical modelling results

De, Klerk Marthinus David. "The durability of natural sisal fibre reinforced cement-based composites". Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96895.

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Thesis (MEng)--Stellenbosch University, 2015.
ENGLISH ABSTRACT: The building industry is responsible for a substantial contribution to pollution. The production of building materials, as well as the operation and maintenance of structures leads to large amounts of carbon-dioxide (CO2) being release in the atmosphere. The use of renewable resources and construction materials is just one of the ways in which the carbon footprint of the building industry can be reduced. Sisal fibre is one such renewable material. Sisal fibre is a natural fibre from the Agave Sisalana plant. The possibility of incorporating sisal fibre in a cement-based matrix to replace conventional steel and synthetic fibres has been brought to the attention of researchers. Sisal fibre has a high tensile strength in excess of polypropylene fibre and comparable to PVA fibre. Sisal fibre consists mainly of cellulose, hemi-cellulose and lignin. The disadvantage of incorporating sisal fibre in a cement-based matrix is the degradation of the composite. Sisal fibres tend to degrade in an alkaline environment due to changes in the morphology of the fibre. The pore water in a cement base matrix is highly alkaline which leads to the degradation of the fibres and reduced strength of the composite over time. Sisal fibre reinforced cement-based composites (SFRCC) were investigated to evaluate the durability of the composites. Two chemical treatments, alkaline treatment and acetylation, were performed on the fibre at different concentrations to improve the resistance of the fibre to alkaline attack. Alkaline treatment was performed by using sodium hydroxide (NaOH), while acetylation was performed by using acetic acid or acetic anhydride. Single fibre pull-out (SFP) tests were performed to evaluate the influence of chemical treatment on fibre strength, to study the fibre-matrix interaction and to determine a critical fibre length. A matrix consisting of ordinary Portland cement (OPC), sand and water were used for the SFP tests. This matrix, as well as alternative matrices containing fly ash (FA) and condensed silica fume (CSF) as supplementary cementitious material, were reinforced with 1% sisal fibre (by volume) cut to a length of 20 mm. The OPC matrix was reinforced with untreated- and treated fibre while the alternative matrices were reinforced with untreated fibre. Alternative matrices containing varying fibre volumes and lengths were also produced. Three-point bending- (indirect), direct tensile- and compression tests were performed on specimens at an age of 28 days to determine the strength of the matrix. The remainder of the specimens were subjected to ageing by extended curing in water at 24˚C and 70˚C respectively and by alternate cycles of wetting and drying, after which it was tested at an age of 90 days from production to evaluate the durability of the fibre. An increase in fibre volume led to a decrease in compressive strength and peak tensile strength. The optimum fibre length at a volume of 1% was 20 mm for which the highest compression strength was recorded. The combination of alkali treatment and acetylation was the most effective treatment condition, followed by alkali treatment at low concentrations of sodium hydroxide. At higher concentrations of sodium hydroxide, a significant reduction in strength was recorded. The addition of supplementary cementitious materials also proved to be effective in mitigating degradation, especially in the cases where CSF was used. FA proved to be less effective in reducing the alkalinity of the matrix. However, the use of FA as fine filler resulted in higher strengths. Specimens manufactured by extrusion did not have superior mechanical properties to cast specimens. The conclusion was made that the use of sisal fibre in a cement-based matrix is effective in providing ductile failure. Chemical treatment and the addition of supplementary cementitious materials did improve the durability of the specimens, although degradation still took place.
AFRIKAANSE OPSOMMING: Die boubedryf is verantwoordelik vir 'n aansienlike bydrae tot besoedeling. Die produksie van boumateriale, sowel as die bedryf en instandhouding van strukture lei tot groot hoeveelhede koolstof dioksied (CO2) wat in die atmosfeer vrygestel word. Die gebruik van hernubare hulpbronne en boumateriale is maar net een van die maniere waarop die koolstof voetspoor van die boubedryf verminder kan word. Sisal vesels is 'n voorbeeld van 'n hernubare materiaal. Sisal vesel is 'n natuurlike vesel afkomstig vanaf die Agave Sisalana plant. Die moontlikheid om sisal vesels in 'n sement gebasseerde matriks te gebruik om konvensionele staal en sintetiese vesels te vervang, is tot die aandag van navorsers gebring. Sisal vesel het 'n hoër treksterkte as polipropileen vesels en die treksterkte vergelyk goed met die van PVA vesels. Sisal vesel bestaan hoofsaaklik uit sellulose, hemi-sellulose en lignien. Die nadeel verbonde aan die gebruik van sisal vesels in 'n sement gebasseerde matriks is die degradasie van die komposiet. Sisal vesels is geneig om af te breek in 'n alkaliese omgewing as gevolg van veranderinge wat in die morfologie van die vesel plaasvind. Die water in die porieë van 'n sement gebasseerde matriks is hoogs alkalies wat lei daartoe dat die vesel afgebreek word en die sterkte van die komposiet afneem oor tyd. Sisal vesel versterkte sement gebasseerde komposiete is ondersoek om die duursaamheid van die komposiete te evalueer. Twee chemiese behandelings, alkaliese behandeling en asetilering, is uitgevoer op die vesels teen verskillende konsentrasies om die weerstand van die vesels teen alkaliese aanslag te verbeter. Alkaliese behandeling was uitgevoer met natrium-hidroksied (NaOH) terwyl asetilering met asynsuur en asynsuurhidried uitgevoer is. Enkel vesel uittrek toetse is uitgevoer om die invloed van chemiese behandeling op veselsterkte te evalueer, om die vesel/matriks interaksie te bestudeer en om die kritiese vesellengte te bepaal. 'n Matriks wat uit gewone Portland sement (OPC), sand en water bestaan, is gebruik vir die enkel vesel uittrek toetse. Dieselfde matriks, sowel as alternatiewe matrikse wat vliegas (FA) en gekondenseerde silika dampe (CSF) as aanvullende sementagtige materiaal bevat, is versterk met 1% vesel (by volume) wat 20 mm lank gesny is. Die OPC matriks was versterk met onbehandelde- en behandelde vesels, terwyl die alternatiewe matrikse met onbehandelde vesels versterk is. Matrikse wat wisselende vesel volumes en lengtes bevat het is ook vervaardig. Drie-punt buigtoetse (indirek), direkte trek toetse en druktoetse is uitgevoer op proefstukke teen 'n ouderdom van 28 dae om die sterkte van die matriks te bepaal. Die oorblywende proefstukke is onderwerp aan veroudering deur verlengde nabehandeling in water teen 24˚C en 70˚C onderskeidelik en deur afwissilende siklusse van nat- en droogmaak waarna dit op 'n ouderdom van 90 dae vanaf vervaardiging getoets is om die duursaamheid van die matriks te evalueer. 'n Toename in vesel volume het tot 'n afname in druksterkte en piek treksterkte gelei. Die optimum vesel lengte teen 'n volume van 1% was 20 mm, waarvoor die hoogste druksterkte opgeteken is. Die kombinasie van alkaliese behandeling en asetilering was die mees effektiewe behandeling, gevolg deur alkaliese behandeling by lae konsentrasies natrium-hidroksied. Vir hoë konsentrasies natrium-hidroksied is 'n aansienlike afname in sterkte opgeteken. Die toevoeging van aanvullende sementagtige materiale was ook effektief om die degradadering van die vesels te verminder, veral in die gevalle waar CSF gebruik is. FA was minder effektief om die alkaliniteit van die matriks te verminder. Die gebruik van FA as fyn vuller het nietemin hoër sterkte tot gevolg gehad. Proefstukke wat deur ekstrusie vervaardig is, het nie beter meganiese eienskappe gehad as proefstukke wat gegiet is nie. Daar is tot die gevolgtrekking gekom dat sisal vesel in 'n sement gebasseerde matriks wel effektief is om 'n duktiele falingsmode te voorsien. Chemiese behandeling en die toevoeging van aanvullende sementagtige materiale het die duursaamheid van die proefstukke verbeter, alhoewel degradering steeds plaasgevind het.

Dhakal, Hom Nath. "The manufacture and properties of natural fibre/nanoclay reinforced unsaturated polyester composites". Thesis, University of Portsmouth, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.503594.

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The effect of different fibre volume fractions of hemp and nanoclay reinforcement on the mechanical, thermal and environmental properties of unsaturated polyester composites has been investigated experimentally. Due to the incorporation of different fibre volume fractions of hemp into polyester resin an improvement in tensile strength and tangent modulus was realised. Likewise, the flexural strength and modulus of unsaturated polyester (UPE) matrix increased with the introduction of hemp fibre. The mechanical tests results suggest that the tensile and flexural properties of composites are related to the fibre volume fractions and interfacial bond strengths between the fibre and matrix. Flexural properties of the composites were found to be comparable to those of chopped strand mat (CSM) glass fibre reinforced UPE composites. Low velocity instrumented falling weight impact tests were conducted to evaluate impact and damage characteristics of hemp and nanoclay reinforced composites. A significant improvement in load bearing capability and impact energy absorption was found by introducing hemp fibre and nanoclay as reinforcement. The impact test results in this study show that the total energy absorbed by the 0.21 fibre volume fraction of hemp reinforced specimen is comparable to the energy absorbed by the composites specimen equivalent in fibre weight percentage of CSM E-glass fibre. All nanoclay reinforced nanocomposite specimens have shown a significant improvement in their impact strength and energy absorption properties compared to unreinforced UPE matrix. The effects of various loading levels of nanoclay reinforcement on the nanomechanical properties of UPE/layered silicate nanocomposites were investigated by a nanoindentation test method. It has shown that the nanoindentation behaviour is strongly influenced by nanoclay reinforcement and the extent of clay dispersion in the polymer matrix. The creep behaviour of hemp fibre reinforced unsaturated polyester (LIFRUPE) composites was investigated using a three-point bending clamp system. Creep strain decreased as the hemp fibre reinforcement increased. The creep deflection value was significantly higher for unreinforced samples compared to hemp fibre reinforced samples. Thermal properties were evaluated using Thermogravimetric Analysis (TGA), Thermo Mechanical Analyser (TMA), Differential Scanning Calorimetry (DSC) and thermal conductivity analysis. TGA results suggest that various concentrations of nanoclay and hemp reinforcement increases the thermal stability of UPE/layered silicate nanocomposites and IIFRUPE composites. Glass transition temperatures (Tg) were also increased with the introduction of clay and hemp fibre reinforcement. Hemp reinforced specimens also showed increased thermal stability indicated by an increased Tg value and decreased decomposition rate. Thermal conductivity values were found to be higher for both clay and hemp reinforced specimens compared to unreinforced polyester. Different fibre volume fraction of HFRUPE composites were subjected to water immersion tests in order to study the effects of water absorption on a range of properties. Water absorption tests were conducted by immersing specimens in a de-ionised water bath at room temperature and 100 °C for different time durations. The tensile, flexural and nanohardness properties of water immersed specimens subjected to both aging conditions were evaluated and compared alongside dry composite specimens. The percentage of moisture uptake increased as the fibre volume fraction increased. The tensile, flexural and nanohardness properties of HFRUPE specimens were found to decrease with increase in percentage moisture uptake. However, the impact properties of HFRUPE composites were found increased after water immersion. Moisture induced degradation of composite samples was significant at elevated temperature. The water absorption pattern of these composites at room temperature was found to follow Fickian behaviour, whereas at elevated temperatures it exhibited non- Fickian. Keywords: Polymer matrix composites (PMCs); Layered silicate nanocomposites; Natural fibre reinforced composites (NFRC); Mechanical properties; Mechanical testing; Moisture absorption; Thermal stability

Morrissey, Helen Lorna. "The modelling of natural fibre-reinforced composites using a multi-scale methodology". Master's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/10981.

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Includes abstract.
Includes bibliographical references (leaves 83-85).
A multi-scale methodology for small strain linear elasticity is presented in this thesis. The homogenisation process is discussed in general, with particular attention to the required boundary constraints on the micro-domain and the extraction of an effective elastic modulus. For the case of a non-linear problem the enforcement of the required boundary constraints becomes non-trivial and thus implementation via the penalty method and lagrange multipliers is investigated.

Hariwongsanupab, Nuttapong. "Development of green natural rubber composites : Effect of nitrile rubber, fiber surface treatment and carbon black on properties of pineapple leaf fiber reinforced natural rubber composites". Thesis, Mulhouse, 2017. http://www.theses.fr/2017MULH0399/document.

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Les effets du caoutchouc nitrile (NBR), du traitement de la surface des fibres et du noir de carbone sur les propriétés des composites à base de caoutchouc naturel renforcé par des fibres d'ananas (NR / PALF) ont été étudiés. L'incorporation de NBR et le traitement de surface de la fibre ont été utilisés pour améliorer les propriétés mécaniques des composites à faible déformation, alors que le noir de carbone a été utilisé pour améliorer ces propriétés à forte déformation. La teneur en fibres a été fixée à 10 phr. Les matériaux composites ont été préparés à l'aide d'un mélangeur à cylindres et ont été réticulés sous presse permettant ainsi le maintien de l'orientation des fibres. Ces composites ont été caractérisés à l’aide du rhéomètre à matrice mobile (MDR), par analyse thermique mécanique dynamique (DMTA) et par tests de traction. La morphologie après fracture cryogénique a été observée à l'aide de la microscopie électronique à balayage (MEB). L'effet du NBR dont la teneur varie de 0 à 20 phr par rapport à la teneur totale en caoutchouc, a été également étudié. Le NBR est utilisé afin d’encapsuler totalement les fibres d’ananas (PALF) ; ceci conduisant à un meilleur transfert de contraintes entre la matrice et les fibres. La méthode de mélange a également été étudiée. Plusieurs types de silanes tels que le propylsilane, l'allylsilane et le silane-69 ont été utilisés pour traiter les fibres pré-nettoyées à l’aide d’un traitement alcalin. Les fibres silanisées ont été caractérisées par spectroscopie infrarouge à transformée de Fourier (FTIR), par spectroscopie de photoélectrons aux rayons X (XPS) et par MEB. Le traitement de la fibre par le silane-69 a permis d’augmenter fortement le module du matériau composite à faible déformation. Ce traitement a été plus efficace que l'incorporation de NBR dans les composites NR / PALF. Ceci peut s’expliquer par une possible réticulation chimique entre le caoutchouc et la fibre traitée au silane-69 plutôt qu’une simple interaction physique du NR, du NBR et de la fibre. Cependant, le renforcement par fibre réduit la déformation à la rupture. Par conséquent, du noir de carbone a également été incorporé dans les composites NR/NBR/PALF et NR/ PALF traitée, afin d’améliorer leurs propriétés ultimes. En incorporant du noir de carbone à un taux de 30 phr dans les deux composites, les propriétés mécaniques des composites ont été améliorées et peuvent être contrôlées à la fois à des déformations faibles et hautes
The effects of nitrile rubber (NBR), fiber surface treatment and carbon black on properties of pineapple leaf fiber-reinforced natural rubber composites (NR/PALF) were studied. The incorporation of NBR and surface treatment of fiber were used to improve the mechanical properties of composites at low deformation, whereas carbon black was used to improve these properties at high deformation. The fiber content was fixed at 10 phr. The composites were prepared using two-roll mill and were cured using compression moulding with keeping the fiber orientation. These composites were characterized using moving die rheometer (MDR), dynamic mechanical thermal analysis (DMTA) and tensile testing. The morphology after cryogenic fracture was observed using scanning electron microscopy (SEM). The effect of NBR from 0 to 20 phr of total rubber content was investigated. NBR is proposed to encase PALF leading to higher stress transfer between matrix and PALF. The method of mixing was also studied. For the fiber surface treatment, propylsilane, allylsilane and silane-69 were treated on the alkali-treated fiber. Treated fibers were characterized using Fourier-Transform infrared spectroscopy (FTIR), x-ray photoelectron spectroscopy (XPS) and SEM. Silane-69 treatment of fiber increased the modulus at low deformation more than the incorporation of NBR of NR/PALF composites due to the chemical crosslinking between rubber and fiber from silane-69 treatment rather than the physical interaction of NR, NBR and fiber. However, reinforcement by fiber reduced the deformation at break. Hence, carbon black was also incorporated into NR/NBR/PALF and NR/surface-treated PALF composites to improve the ultimate properties. By incorporation of carbon black 30 phr in both composites, the mechanical properties of composites were improved and can be controlled at both low and high deformations

Mak, Chun Fai Patric. "An investigation into the behaviour of fibre reinforced natural gas powered vechicle (NGV) pressure cylinders under impact loading". Thesis, University of Newcastle Upon Tyne, 1998. http://hdl.handle.net/10443/782.

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Commonly encountered accidental impact, e.g. due to roadway stone hitting, is detrimental not only because it can produce apparent surface defects, but also because barely visible impact damage (BVID) can be induced inside the material, which is not easy to detect by routine inspection. Reliable prediction of the amount of damage of this type induced under known service conditions is particularly important. Therefore, this type of impact was chosen as the focus of the present investigation. A combination of experimental techniques and finite element modelling was used to explore the behaviour of a fibre reinforced natural gas powered vehicle (NGV) pressure cylinder subjected to a low energy impact. In order to identify the modes of failure and understand the structural response, quasi-static indentation tests were carried out on sections of composite pipes and of a composite pressure cylinder. Delamination and matrix cracking were established to be the two major failure modes induced by indentation. Experimental findings were used as a basis for assessing the validity of the modelling approach. Thick shell and three dimensional finite element models were developed using PAFEC, a general purpose finite element code for dynamic and static analysis. It established that the composite pressure cylinder under this type of impact behaves quasi-statically, i.e. the impact phenomenon predominately excites low frequency response. Repeated impact was considered in order to extend the study to include the impact behaviour of a cylinder with pre-existing damage. It was found that a bulging effect was produced in the pressure cylinder at the impact site, where a weak spot was created due to fibre breakage. A fully three dimensional finite element model with static analysis was developed to investigate the damage and material degradation during the BVID phenomenon. The contact pressure distribution based on the Hertzian contact' relationship was applied. Failure mode identification criteria proposed by Hashin (1980) and Chang and Springer (1986) were used to establish the mode and extent of damage in the composite cylinder under quasi-static loading. The predicted failure modes agreed well with the experimental results. Finally, the present study sets out the methodology allowing systematic design of structures having optimal impact tolerance. Based on the findings of this project, suggestions for the improvement of impact resistance of NGV cylinders were given in Chapters ix.

Carpenter, James Edward Philip. "The preparation and properties of composites reinforced with natural fibres". Thesis, Bangor University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409572.

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Pisupati, Anurag. "Manufacturing and characterization of flax fiber reinforced thermoset composites". Thesis, Ecole nationale supérieure Mines-Télécom Lille Douai, 2019. http://www.theses.fr/2019MTLD0014.

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Cette thèse présente un aperçu des composites thermodurcissables à base de fibres de lin de deux points de vue : fabrication par moulage par injection de résine et caractérisation mécanique. En particulier, deux matrices thermodurcissables ont été étudiées, à savoir l’époxy classique et la benzoxazine biosourcée. L’influence des propriétés intrinsèques des fibres de lin tels que la variabilité, le gonflement de la fibre et l’absorption de liquide sur la fabrication de pièces composites est étudiée. En considérant le gonflement des fibres et l’absorption des liquides, un modèle mathématique pour l’ascension capillaire des liquides dans les fibres de lin est proposé. Les modèles classiques de perméabilité ne pouvant être adoptés pour les fibres de lin en raison de leurs irrégularités de section et des diamètres de fibres, cette étude a recours à des simulations numériques pour estimer statistiquement la perméabilité. L’influence de la pression d’injection lors du moulage par transfert de résine sur la teneur en vides dans les plaques de lin/époxy est caractérisée et modélisée afin de comprendre les différences entre la formation de vides dans les composites renforcés par fibres de verre et fibres de lin. L’effet du cycle de polymérisation sur les propriétés mécaniques des composites est étudié par des tests de traction de composites de lin unidirectionnels afin de souligner l’évolution d’accroche mécanique à l’interface fibre / matrice provoquée par la pénétration de la résine dans les fibres élémentaires avec l’augmentation de la température de traitement. Enfin, le comportement à long terme des composites est examiné pour les composites lin/époxy et les composites lin/benzoxazine, par test de vieillissement hygrothermique
This dissertation presents insights into flax fiber based thermoset composites from two standpoints; manufacturing the composites by resin transfer molding and their mechanical characterization. In particular, two thermoset matrices have been investigated, i.e. conventional epoxy and bio-based benzoxazine. The influence of the intrinsic properties of flax fibers such as variability, fiber swelling and liquid absorption on the manufacturing of composite parts is investigated. By considering fiber swell and liquid absorption, a mathematical model for the capillary rise of liquid in flax fibers is proposed. As classical tow permeability models cannot be adopted for flax fibers due to their irregularities in cross-section and fiber diameter, this study resorts to numerical simulations to statistically estimate the permeability. The influence of injection pressure during resin transfer molding on void content in flax/epoxy plates is characterized and modeled to understand the differences in void formation from glass fiber composites. The effect of cure cycle on the mechanical properties of composites is investigated by tensile tests of unidirectional flax composites to emphasize the evolution of the mechanical locking at fiber/matrix interface caused by resin penetration into elementary fibers with increase in processing temperature. Finally, the long-term behavior of composites is examined for flax/epoxy composites and flax/benzoxazine composites, by hygrothermal aging test

Newby, William Robert. "Environmentally acceptable friction composites". Thesis, University of Exeter, 2014. http://hdl.handle.net/10871/15032.

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Currently, the production of most non-asbestos organic (NAO) friction materials depends on a long and energy intensive manufacturing process and an unsustainable supply of synthetic resins and fibres; it is both expensive and bad for the environment. In this research, a new, more energy efficient, manufacturing process was developed which makes use of a naturally derived resin and natural plant fibres. The new process is known as 'cold moulding' and is fundamentally different from the conventional method. It was used to develop a new brake pad for use in low temperature (<400 °C) applications, such as rapid urban rail transit (RURT) trains. A commercially available resin based upon cashew nut shell liquid (CNSL) was analysed and found to have properties suitable for cold moulding. In addition, hemp fibre was identified as a suitable composite reinforcement. This was processed to improve its morphology and blended with aramid to improve its thermal stability. Each stage of cold mould manufacture was thoroughly investigated and the critical process parameters were identified. The entire procedure was successfully scaled up to produce an industrially sized 250 kg batch of material and the resultant composites were found to have appropriate thermal and mechanical properties for use in a rail brake pad. The tribological performance of these composites was iteratively developed through a rigorous testing and evaluation procedure. This was performed on both sub- and full-scale dynamometers. By adding various abrasives, lubricants, and fillers to the formulation it was possible to produce a brake pad with similar friction characteristics to the current market material, but with a 60% lower wear rate. In addition, this brake pad caused 15% less wear to the brake disc. A detailed examination of both halves of the friction couple found that cold moulded composites exhibit a different wear mechanism from the current market material, which was suggested to be the reason for their superior properties. Cold moulding is 3.5x faster and uses 400% less energy than the conventional method.

Più fonti

Libri sul tema "Natural fibre reinforced composites":

Salit, Mohd Sapuan, Mohammad Jawaid, Nukman Bin Yusoff e M. Enamul Hoque, a cura di. Manufacturing of Natural Fibre Reinforced Polymer Composites. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-07944-8.

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Le Moigne, Nicolas, Belkacem Otazaghine, Stéphane Corn, Hélène Angellier-Coussy e Anne Bergeret. Surfaces and Interfaces in Natural Fibre Reinforced Composites. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-71410-3.

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Thomas, Sabu, e Laly A. Pothan. Natural fibre reinforced polymer composites: From macro to nanoscale. Paris: Éd. des Archives Contemporaines, 2009.

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Muthukumar, Chandrasekar, Senthilkumar Krishnasamy, Senthil Muthu Kumar Thiagamani e Suchart Siengchin, a cura di. Aging Effects on Natural Fiber-Reinforced Polymer Composites. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8360-2.

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Krishnasamy, Senthilkumar, Mohit Hemath Kumar, Jyotishkumar Parameswaranpillai, Sanjay Mavinkere Rangappa e Suchart Siengchin, a cura di. Interfacial Bonding Characteristics in Natural Fiber Reinforced Polymer Composites. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8327-8.

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Goh, Kheng Lim. Discontinuous-Fibre Reinforced Composites. London: Springer London, 2017. http://dx.doi.org/10.1007/978-1-4471-7305-2.

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Bentur, Arnon. Fibre reinforced cementitious composites. London: Elsevier Applied Science, 1990.

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Bentur, Arnon. Fibre reinforced cementitious composites. 2^a ed. London: Taylor & Francis, 2007.

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Sultan, Mohamed Thariq Hameed Sultan, Murugan Rajesh e Kandasamy Jayakrishna. Failure of Fibre-Reinforced Polymer Composites. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003128861.

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Haddad, Y. M., a cura di. Advanced Multilayered and Fibre-Reinforced Composites. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-007-0868-6.

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Capitoli di libri sul tema "Natural fibre reinforced composites":

Kumar, Garje C. Mohan, e Sabuj Mallik. "Natural Fibre-Reinforced Polymer Composites". In Failure of Fibre-Reinforced Polymer Composites, 1–11. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003128861-1.

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Kumari, Neelam, Shivali Meena, Monika Chaparia, Sandip P. Choudhury, Ravi Kant Choubey e Umesh Kumar Dwivedi. "Natural Fibre Reinforced Composites for Industrial Applications". In Polymer Composites, 301–27. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-2075-0_10.

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Shwetharani, R., K. V. Yatish, M. S. Jyothi, C. Lavanya, Sabarish Radoor e R. Geetha Balakrishna. "Natural Fibre-Reinforced Vinyl Ester Composites". In Vinyl Ester-Based Biocomposites, 141–59. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003270997-9.

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Zindani, Divya, Kaushik Kumar e João Paulo Davim. "Fire Performance of Natural Fiber Reinforced Polymeric Composites". In Reinforced Polymer Composites, 209–24. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2019. http://dx.doi.org/10.1002/9783527820979.ch11.

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Korniejenko, Kinga, Michał Łach e Janusz Mikuła. "Mechanical Properties of Raffia Fibres Reinforced Geopolymer Composites". In Advances in Natural Fibre Composites, 135–44. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-64641-1_13.

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Verma, Deepak. "Processing Techniques of Nanoclay Based Natural Fibre Reinforced Polymer Composites". In Nanoclay Reinforced Polymer Composites, 209–37. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0950-1_9.

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Russo, Pietro, Giorgio Simeoli, Valentina Lopresto, Antonio Langella e Ilaria Papa. "Environmental Friendly Thermoplastic Composite Laminates Reinforced with Jute Fabric". In Advances in Natural Fibre Composites, 119–26. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-64641-1_11.

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Siddique, Amna, Khubab Shaker e Hanur Meku Yesuf. "Environmental Degradation of Natural Fibre–Reinforced Composites". In Emerging Sustainable and Renewable Composites, 33–52. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003408215-2.

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Santulli, Carlo. "Nanoclay Based Natural Fibre Reinforced Polymer Composites: Mechanical and Thermal Properties". In Nanoclay Reinforced Polymer Composites, 81–101. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0950-1_4.

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de M. de Lima, Tielidy A., Gabriel Goetten de Lima e Michael J. D. Nugent. "Natural Fibre-Reinforced Polymer Composites: Manufacturing and Biomedical Applications". In Polymeric and Natural Composites, 25–63. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70266-3_2.

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Atti di convegni sul tema "Natural fibre reinforced composites":

Schwarzova, Ivana, Nadezda Stevulova e Tomas Melichar. "Hemp Fibre Reinforced Composites". In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.044.

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The conventional homogeneous materials can no longer effectively satisfy the growing demands on product capabilities and performance, due to the advancement in products design and materials engineering. Therefore, the fibre reinforced composites with better properties and desirable applications emerged. Natural fibres have high strength to low weight ratios and have good sound and thermal insulation properties. Combination of organic filler and inorganic matrix creates high-quality products such as fibre boards and composites. The great importance is attached to industrial hemp as source of the rapidly renewable fibres and as non-waste material. Industrial hemp fibre has great potential in composite materials reinforcement. However, improving interfacial bonding between fibres and matrix is an important factor for its using in composites. This paper deals with hemp fibre reinforced composites in civil engineering as component part of sustainable construction. Prepared lightweight composites based on original and pre-treated hemp hurds are characterized by selected physical and mechanical properties (density, thermal conductivity, water absorbability, compressive and tensile strength) in dependence on used inorganic binder (traditional Portland cement and alternative MgO-cement).

Takagi, H., e Y. Hagiwara. "Fracture behaviour of natural fibre reinforced composites". In HPSM 2010. Southampton, UK: WIT Press, 2010. http://dx.doi.org/10.2495/hpsm100211.

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de Araujo Alves Lima, Rosemere, DANIEL KIOSHI CAVALCANTI, Jorge Neto e DOINA BANEA. "CHARACTERIZATION OF NATURAL FIBRE REINFORCED HYBRID COMPOSITES". In X Congresso Nacional de Engenharia Mecânica. ABCM, 2018. http://dx.doi.org/10.26678/abcm.conem2018.con18-0215.

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Song, Young Seok, Jung Tae Lee, Jae Ryoun Youn, A. D’Amore, Domenico Acierno e Luigi Grassia. "Natural Fiber Reinforced PLA Composites". In V INTERNATIONAL CONFERENCE ON TIMES OF POLYMERS (TOP) AND COMPOSITES. AIP, 2010. http://dx.doi.org/10.1063/1.3455601.

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Yousif, B. F., K. J. Wong e N. S. M. El-Tayeb. "An Investigation on Tensile, Compression and Flexural Properties of Natural Fibre Reinforced Polyester Composites". In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-44012.

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In the present work, effects of two types of natural fibres on mechanical properties of polyester composites were investigated at different volume fractions of fibre. Tensile, compression, and flexural properties of oil palm bunch and oil palm fruit fibres reinforced polyester composites were investigated. Additionally, tensile strength of the selected composites was calculated theoretically. Scanning electron microscope was used to observe the fracture mechanism of the specimens. Single fiber pull-out tests were carried out to determine the interfacial shear strength between polyester resin and both types of oil palm fibre. As results, it was found that both types of oil palm fibre enhanced the mechanical performance of polyester composites. At higher volume fraction (≈41%), tensile strength was improved, when polyester reinforced with oil palm fruit fibres, i.e. 2.5 folds improvement in the tensile strength value. Further, experimental tensile strength values of oil palm bunch/polyester composites was found to be less varied compared to theoretical results. Flexural strength of polyester was worsened with oil palm fibres at all of fibre volume fraction.

Ayrilmis, Nadir, e Alireza Ashori. "Automotive Interior Applications of Natural Fibre Reinforced Polymer Composites". In World Congress on Sustainable Technologies. Infonomics Society, 2021. http://dx.doi.org/10.20533/wcst.2021.0007.

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Kooshki, Pantea, e Tsz-Ho Kwok. "Review of Natural Fiber Reinforced Elastomer Composites". In ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-86042.

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This paper is a review on mechanical characteristics of natural fibers reinforced elastomers (both thermoplastics and thermosets). Increasing environmental concerns and reduction of petroleum resources attracts researchers attention to new green eco-friendly materials. To solve these environmental related issues, cellulosic fibers are used as reinforcement in composite materials. These days natural fibers are at the center of attention as a replacement for synthetic fibers like glass, carbon, and aramid fibers due to their low cost, satisfactory mechanical properties, high specific strength, renewable resources usage and biodegradability. The hydrophilic property of natural fibers decreases their compatibility with the elastomeric matrix during composite fabrication leading to the poor fiber-matrix adhesion. This causes low mechanical properties which is one of the disadvantages of green composites. Many researches have been done modifying fiber surface to enhance interfacial adhesion between filler particles and elastomeric matrix, as well as their dispersion in the matrix, which can significantly affect mechanical properties of the composites. Different chemical and physical treatments are applied to improve fiber/matrix interlocking.

Seviaryna, Inna, Heloisa Gomes Bueno, Elena Maeva e Jimi Tjong. "Characterization of natural fibre-reinforced composites with advanced ultrasonic techniques". In 2014 IEEE International Ultrasonics Symposium (IUS). IEEE, 2014. http://dx.doi.org/10.1109/ultsym.2014.0353.

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Lorenzi, W., L. Di Landro, A. Casiraghi, M. R. Pagano, Alberto D’Amore, Domenico Acierno e Luigi Grassia. "NATURAL FIBER OR GLASS REINFORCED POLYPROPYLENE COMPOSITES?" In IV INTERNATIONAL CONFERENCE TIMES OF POLYMERS (TOP) AND COMPOSITES. AIP, 2008. http://dx.doi.org/10.1063/1.2989033.

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Mugarura, Isaac, e Mehmet Çevik. "Natural Fibers in Uganda Suitable for Sustainable Natural Fiber Reinforced Composites". In 7th International Students Science Congress. Izmir International guest Students Association, 2023. http://dx.doi.org/10.52460/issc.2023.040.

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Abstract (sommario):

The use of natural fibers in composite polymers has grown rapidly and has gained popularity in various areas. Most of these natural fibers can also be found in Uganda. Many sectors are currently shifting to “green technologies” that are environmentally friendly in order to reduce synthetic plastic wastes and pollutions. Natural fibers are at low-cost with high specific properties and low densities. Based on these factors, most developing countries already begun using natural fibers to produce good quality products that are effective and economical. Countries like Uganda are the future source of many known and many unknown natural fibers. One of the uses of natural fiber reinforced composites is the automotive industry; Uganda is a promising country in this sense. In this study, we will review the natural fibers in Uganda suitable for natural fiber reinforced composites. These are, namely, mutuba tree (ficus natalensis), rice and coffee husk, cotton, Sansevieria trifasciata, banana fibers, sisal fibers, marsh grass and bamboo fibers. These plants are found in many other countries; however, a combined investigation is presented in our study. These fibers are mainly used in textiles, automotive industry, and lightweight items. Their future use as structural parts of low to medium strength are evaluated.

Rapporti di organizzazioni sul tema "Natural fibre reinforced composites":

Poole, M., e M. Gower. Mechanical Characterisation of 3D Fibre-Reinforced Plastic (FRP) Composites. National Physical Laboratory, maggio 2022. http://dx.doi.org/10.47120/npl.mgpg151.

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Trask, Richard S., Mark Hazzard e Tom Llewellyn-Jones. Additive Layer Manufacturing of Biologically Inspired Short Fibre Reinforced Composites. Fort Belvoir, VA: Defense Technical Information Center, marzo 2014. http://dx.doi.org/10.21236/ada606966.

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Beaver, P. W. A Review of Multiaxial Fatigue and Fracture of Fibre-Reinforced Composites. Fort Belvoir, VA: Defense Technical Information Center, gennaio 1987. http://dx.doi.org/10.21236/ada191990.

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Salmeron Perez, N., R. M. Shaw e M. R. L. Gower. Mechanical testing of fibre-reinforced polymer matrix composites at cryogenic temperatures (-165ºC). National Physical Laboratory, novembre 2022. http://dx.doi.org/10.47120/npl.mat112.

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Dissanayake, N. Assessment of Data Quality in Life Cycle Inventory (LCI) for Fibre-reinforced Polymer (FRP) composites. National Physical Laboratory, agosto 2022. http://dx.doi.org/10.47120/npl.mat106.

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Pemberton, R. G., D. Edser e MRL Gower. Optimisation of acid digestion conditions for volume fraction measurements of hard to digest fibre-reinforced polymer composites. National Physical Laboratory, settembre 2020. http://dx.doi.org/10.47120/npl.mn12.

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Carus, Michael, Asta Eder, Lara Dammer, Hans Korte, Lena Scholz, Roland Essel, Elke Breitmayer e Martha Barth. Wood-Plastic Composites (WPC) and Natural Fibre Composites (NFC): European and Global Markets 2012 and Future Trends in Automotive and Construction. Nova-Institut GmbH, giugno 2015. http://dx.doi.org/10.52548/thsz9515.

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Salmeron Perez, N., R. M. Shaw e M. R. L. Gower. Mechanical testing of fibre-reinforced polymer matrix composites at cryogenic temperatures. Requirements for mechanical test capability at -269°C (4 K). National Physical Laboratory, giugno 2022. http://dx.doi.org/10.47120/npl.mat102.

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Spetsieris, N., e D. Edser. Framework for dynamic uncertainty budget evolution for mode I fracture toughness measurements of fibre-reinforced plastic (FRP) composites: a user’s guide to uncertainty budget calculation tool. National Physical Laboratory, giugno 2022. http://dx.doi.org/10.47120/npl.mat104.

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