Artigos de revistas: "Short fibre-Reinforced polymer composites"

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Piggott, Michael R. "Short Fibre Polymer Composites: a Fracture-Based Theory of Fibre Reinforcement". Journal of Composite Materials 28, n.º 7 (maio de 1994): 588–606. http://dx.doi.org/10.1177/002199839402800701.

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The interphase between reinforcing fibers and polymers is brittle, and does not behave in the way it was assumed to when the standard theory for composite strength was developed. Futhermore, this theory predicts curved stress-strain plots for aligned short fibre composites, yet the evidence for this is unconvincing, and there is much new evidence that these stress-strain curves are straight. The time has therefore come to abandon this approach and take into account, instead, the apparent brittleness and sudden failure of aligned fibre reinforced polymers. This paper presents the evidence, and introduces the new approach. This involves microcrack development in composites from stress concentrations at the fibre ends. Since such failure initiation can occur simultaneously at many sites, the stress required to cause abrupt failure across the whole cross section can be estimated by a simple force balance. This analysis gives the familiar expressions used for short fibre composites, with one important difference. For carbon reinforced polymers, the polymer has to reach its breaking strength before failure, so that there is no minimum volume fraction for reinforcement with these composites. With glass, on the other hand, which has a higher breaking strain than most thermosets used for composites, the matrix appears unable to exert its full strength. Thus low fibre volume fraction glass fibre composites can be weaker than the matrix, and a minimum volume fraction for reinforcement exists.

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K V, Ambareesh. "Moisture Absorption Studies of COIR and Sisal Short Fiber Reinforced Polymer Composites". International Journal for Research in Applied Science and Engineering Technology 9, n.º 9 (30 de setembro de 2021): 116–27. http://dx.doi.org/10.22214/ijraset.2021.37928.

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Abstract: Easy availability of natural fibre, low cost and ease of manufacturing have urged the attention of researchers towards the possibility of reinforcement of natural fiber to improve their mechanical properties and study the extent to which they satisfy the required specifications of good reinforced polymer composite for industrial and structural applications. Polymer composites made of natural fiber is susceptible for moisture. Moisture absorption in such composites mainly because of hydrophilic nature of natural fibers. Water uptake of natural fiber reinforced composites has an effect on different. Lot of researchers prepared the natural fiber reinforced composites without conducting water absorption tests; hence it is the potential area to investigate the behavior of the composites with different moisture absorption. In this research the experimental sequence and the materials are used for the study of coir and Sisal short fiber reinforced epoxy matrix composites. The coir and Sisal short fibers are made into the short fibers with 10 mm x 10 mm x 5 mm size. The Epoxy Resin-LY556(Di glycidyl ether of bi phenol) and Hardner-HYD951 (Tetra mine), the water absorption behaviors are analyzed in the coir and Sisal short fibers reinforced epoxy composites. The water absorption behaviors of the epoxy composites reinforced with the coir and sisal short fibers with 25, 30 and 35wt% were analyzed at three different water environments, such as sea water, distilled water, and tap water for 12 days at room temperature. It was observed that the composites show the high level of the water absorption percentage at sea water immersion as compared to the other water environments. Due to the water absorption, the mechanical properties of macro particle/epoxy composites were decreased at all weight percentages. Keywords: Natural fibre, Moisture absorption, Coir and sisal short fibre, Reinforced polymer composites, Water absorption behaviour Polymer matrix composite (Epoxy resin) using Coir and sisal short fibre and to study its moisture absorption behaviour

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Banthia, N., e A. J. Boyd. "Sprayed fibre-reinforced polymers for repairs". Canadian Journal of Civil Engineering 27, n.º 5 (1 de outubro de 2000): 907–15. http://dx.doi.org/10.1139/l00-027.

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The use of fibre-reinforced polymers for repair and retrofit is growing at an unprecedented rate. This technique has been used for strengthening and rehabilitation of columns, beams, masonry, joints, etc. and has also found significant suitability for seismic applications. All research to date has focused, however, on wraps and jackets with continuous, unidirectional fibres. Within the auspices of Network of Centers of Excellence on Intelligent Sensing for Innovative Structures (ISIS) program, an entirely new method of fibre reinforced polymer coating is being developed. In this method, the composite with short, randomly distributed fibres is sprayed on the surface of concrete to be repaired. Composite gets pneumatically compacted on the application surface and develops a strong bond with concrete during the hardening process. In this paper, the effectiveness of the spray technique is compared with wraps carrying continuous fibres when applied to concrete cylinders under compression. To assess size effects, a companion test series involving larger cylinders was carried out. It was found that sprayed composites with randomly distributed short fibres performed equally well as or even better than wraps with continuous fibres. Within the continuous fibre wraps, those with a 0-90° fibre orientation are far more effective than those with a ±45° orientation.Key words: concrete, repair, glass fibre, polymer matrix, spray, wraps, deformability, size effects.

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Begum, K., M. A. Islam e M. M. Huque. "Investigation on the Tensile and Flexural Properties of Coir-fibre-reinforced Polypropylene Composites". Journal of Scientific Research 7, n.º 3 (1 de setembro de 2015): 97–111. http://dx.doi.org/10.3329/jsr.v7i3.23075.

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The utilization of natural fibres as reinforcement in polymer composites has been increased significantly for their lightweight, low cost, high specific strength, modulus and biodegradable characteristic. In this present work, the mechanical properties of randomly distributed short coir-fibre-reinforced polypropylene (PP) composites have been studied as a function of fibre loading. In order to improve the composites mechanical properties, raw coir fibres were treated with 1% alkali (NaOH) solution. Both raw and alkali treated coir-fibre-reinforced PP composites were prepared with different fibre loadings (10, 15, 20, 25, 30 and 35 wt%) using a double roller open mixer machine and injection molding machine. The mechanical properties, such as tensile strength (TS), tensile modulus (TM), flexural strength (FS) and flexural modulus (FM) were investigated for the prepared composites. The alkali treated coir-fibre-reinforced PP composites showed better results in mechanical properties compared to untreated composites. Finally, the optical microscopic studies were carried out on fractured surfaces of the tensile test specimens, which indicated weak interfacial bonding between the fibre and the polymer.

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Dickson, Andrew N., Hisham M. Abourayana e Denis P. Dowling. "3D Printing of Fibre-Reinforced Thermoplastic Composites Using Fused Filament Fabrication—A Review". Polymers 12, n.º 10 (24 de setembro de 2020): 2188. http://dx.doi.org/10.3390/polym12102188.

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Three-dimensional (3D) printing has been successfully applied for the fabrication of polymer components ranging from prototypes to final products. An issue, however, is that the resulting 3D printed parts exhibit inferior mechanical performance to parts fabricated using conventional polymer processing technologies, such as compression moulding. The addition of fibres and other materials into the polymer matrix to form a composite can yield a significant enhancement in the structural strength of printed polymer parts. This review focuses on the enhanced mechanical performance obtained through the printing of fibre-reinforced polymer composites, using the fused filament fabrication (FFF) 3D printing technique. The uses of both short and continuous fibre-reinforced polymer composites are reviewed. Finally, examples of some applications of FFF printed polymer composites using robotic processes are highlighted.

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Sliseris, Janis, Libo Yan e Bohumil Kasal. "Numerical modelling of flax short fibre reinforced and flax fibre fabric reinforced polymer composites". Composites Part B: Engineering 89 (março de 2016): 143–54. http://dx.doi.org/10.1016/j.compositesb.2015.11.038.

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Singha, A. S., e Vijay Kumar Thakur. "Synthesis and Characterization of ShortSaccaharum CilliareFibre Reinforced Polymer Composites". E-Journal of Chemistry 6, n.º 1 (2009): 34–38. http://dx.doi.org/10.1155/2009/176072.

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This paper deals with the synthesis of shortSaccaharum Cilliarefibre (SC) reinforced Urea-Formaldehyde (UF) matrix based polymer composites. Present work reveals that mechanical properties such as: tensile strength, compressive strength, flexural strength and wear resistance of the UF matrix increase up to 30% fibre loading(in terms of weight) and then decreases for higher loading when fibers are incorporated into the matrix polymer. Morphological and Thermal studies of the matrix, fibre and short fibre reinforced (SF-Rnf) green composites have also been carried out. The results obtained emphasize the applications of these fibres, as potential reinforcing materials in bio based composites.

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Młyniec, A., e T. Uhl. "Modelling and testing of ageing of short fibre reinforced polymer composites". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, n.º 1 (19 de setembro de 2011): 16–31. http://dx.doi.org/10.1177/0954406211411552.

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A study in accelerated humidity–temperature ageing and it is numerical modelling for short fibre reinforced polymer composites (SFRPC) based on poly(butylene terephthalate) (PBT) is reported. Authors described experimental results of humidity–temperature ageing of PBT reinforced with glass fibres and proposed a novel computation method of strength and durability analysis for SFRPC parts. Experimental results showed different ageing behaviours, which depend on fibre alignment, e.g. a decrease of Young’s modulus in longitudinal fibre alignment in tension after ageing, an increase of Young’s modulus in transverse direction in tension after ageing, and the increase of the shear modulus and decrease of shear strength after ageing in both directions. Proposed modelling procedure takes the fibre orientation from mould filling analysis as an independent material orientation, using a developed ageing dependent material model, based on tensile, compressive, and shear properties for longitudinal and transverse fibre alignments, and calculates failure criteria as a function of the ageing time and fibre alignment. An innovative approach is to create a fibre alignment dependent material ageing model which takes into account changes of material properties depending on the direction of the reinforcement. This methodology was extended to arbitrary models and validated on real parts made of SFRPC.

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Gloria-Esparza, C., J. Zurek, Qiang Yuan, Stuart Bateman e Kenong Xia. "Electrostatic Dissipative Glass Fibre Reinforced Composites". Key Engineering Materials 312 (junho de 2006): 123–26. http://dx.doi.org/10.4028/www.scientific.net/kem.312.123.

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Electrically conductive composites were made from short glass fibre (GF) and carbon black (CB) blended with high-density polyethylene (HDPE) using a single screw extruder. The Young’s modulus, tensile and impact strengths were improved with the addition of GF, and the surface conductivity in the static dissipative range of 10-6 to 10-9 S was achieved at CB content as low as 1 wt%, significantly lower than that in the unreinforced CB/HDPE. Addition of a coupling agent (MAPE) improved bonding between fibres and the polymer matrix and increased the stiffness and fracture resistance.

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Elbadry, Elsayed A., GA Abdalla, M. Aboraia e EA Oraby. "Notch sensitivity of short and 2D plain woven glass fibres reinforced with different polymer matrix composites". Journal of Reinforced Plastics and Composites 36, n.º 15 (7 de abril de 2017): 1092–98. http://dx.doi.org/10.1177/0731684417702529.

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This research article investigated the notch sensitivity of two different glass fibre architectures, namely short and 2D plain-woven glass fibres reinforced with unsaturated polyester and epoxy matrix composites fabricated by the hand lay-up technique. This was carried out through open hole tension tests at different ratios of the specimen hole diameter to the specimen with three different values (0.1, 0.2, 0.5) compared to the unnotched specimen. The notch sensitivity of these composites was evaluated using the residual tensile strength by the application of Whitney–Nuismer Mathematical Model. The results showed that by using polyester matrix, the notch sensitivity of composites reinforced with plain-woven glass fibre is higher than that of short glass fibre at different D/W ratios. On the other hand, on testing epoxy matrixes, the notch sensitivity of composites reinforced with plain-woven glass fibre is lower than that of short glass fibre at different D/W ratios.

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Patnaik, Amar, Ritesh Kaundal, Alok Satapathy, Sandhyarani Biswas e Pradeep Kumar. "Solid Particle Erosion of Particulate Filled Short Glass Fiber Reinforced Polyester Resin Composites". Advanced Materials Research 123-125 (agosto de 2010): 213–16. http://dx.doi.org/10.4028/www.scientific.net/amr.123-125.213.

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Fiber reinforced composite materials have been used in main parts of structures; an accurate evaluation of their erosion behavior becomes very important. In this study, short glass fibre reinforced polyester based isotropic polymer composites are fabricated with five different fibre weight-fractions. The effect of various operational variables, material parameters and their interactive influences on erosive wear behavior of these composites has been studied systematically. After systematic analysis of solid particle erosion for all the five composites, 30wt% short glass fiber reinforced polyester based composite shows better erosion resistance. In order to improve the erosion resistance further ceramic silicon carbide particle is reinforced with the 30wt% glass-polyester based hybrid composites. A ﬁnite element (FE) model (LS-DYNA) of erosive wear is established for damage assessment and validated by a well designed set of experiments. For this, the design of experiments approach using Taguchi’s orthogonal arrays design is used. It is recognized that there is a good agreement between the computational and experimental results, and that the proposed simulation method is very useful for the evaluation of damage mechanisms.

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Mohan, T. P., e K. Kanny. "Mechanical Properties and Failure Analysis of Short Kenaf Fibre Reinforced Composites Processed by Resin Casting and Vacuum Infusion Methods". Polymers and Polymer Composites 26, n.º 2 (fevereiro de 2018): 189–204. http://dx.doi.org/10.1177/096739111802600207.

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Modified and unmodified short kenaf fibre reinforced epoxy composites were processed with different short fibre lengths and fibre concentrations by resin casting (RC) and vacuum-assisted resin infusion (VARIM) methods. Three types of kenaf fibres were reinforced in epoxy polymer, namely, untreated kenaf fibre, mercerised and nanoclay-infused kenaf fibres. The mechanical properties such as tensile, flexural and impact properties of composites were studied. Nanoclay infused kenaf fibres have shown better tensile, flexural and impact properties than those of untreated and mercerised fibres. The composites processed by VARIM possess improved tensile and flexural properties when compared with RC composites, whereas the impact properties were better in RC composites than those of VARIM processed composites. The results showed that the mechanical properties of composites depend on the short fibre length and fibre concentration, irrespective of the processing conditions. Improved water barrier properties were also obtained in nanoclay-treated banana fibre composites.

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Biolzi, L., L. Castellani e I. Pitacco. "On the mechanical response of short fibre reinforced polymer composites". Journal of Materials Science 29, n.º 9 (maio de 1994): 2507–12. http://dx.doi.org/10.1007/bf00363447.

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Lokuge, Weena, Rajab Abousnina e Nilupa Herath. "Behaviour of geopolymer concrete-filled pultruded GFRP short columns". Journal of Composite Materials 53, n.º 18 (26 de fevereiro de 2019): 2555–67. http://dx.doi.org/10.1177/0021998319833447.

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This research paper presents the results of an experimental investigation on the axial compressive behaviour of 24 geopolymer concrete-filled glass fibre-reinforced polymer tubes. The test variables considered are the compressive strength of geopolymer concrete (30 MPa and 35 MPa) and the shape of the cross section (square, circular and rectangular). All the glass fibre-reinforced polymer tubes had the same amount of fibres and similar fibre orientation together with the same aspect ratio. The failure of the square and rectangular columns initiated with the splitting of the corners and resulted in a lower load-carrying capacity compared to the circular columns whose failure was initiated by the crushing of glass fibre-reinforced polymer tube followed by the separation of glass fibre-reinforced polymer tube into strips. It can be concluded that axial load-carrying capacity of square and rectangular sections can be improved by a concrete filler with higher compressive strength. Adopted finite element analysis to simulate the behaviour of the columns is capable of predicting the stress–strain behaviour and the mode of failure.

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Deng, Shi Qiang. "Simulation of Time-Dependant Deformation of Polymer Matrix Composites Based on Short-Term Data". Key Engineering Materials 312 (junho de 2006): 143–48. http://dx.doi.org/10.4028/www.scientific.net/kem.312.143.

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This paper presents an effort for simulating time-dependant deformation behaviour of polymer matrix composites analytically and experimentally. The proposed models were developed on the basis of the classic lamination theory and the viscoelastic approach with consideration of the anisotropic deformation of fibre reinforced polymer (FRP) composite materials. A series of shortterm creep and recovery tests were conducted to provide the basic material properties and to verify the predictive models. It was found that a fairly good agreement has been achieved between the proposed models with the creep testing data of a cross-ply carbon fibre/urethane resin composite laminate under different loading orientations.

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Singha, A. S., e Vijay Kumar Thakur. "Grewia optivaFiber Reinforced Novel, Low Cost Polymer Composites". E-Journal of Chemistry 6, n.º 1 (2009): 71–76. http://dx.doi.org/10.1155/2009/642946.

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In this research article, the assessment of properties of compression moldedGrewia optivafiber reinforced Urea-Formaldehyde (UF) matrix based polymer composites is reported. Reinforcing of the UF resin withGrewia optivafiber was accomplished in the particle, short and long fiber reinforcement. Present work reveals that mechanical properties such as: tensile strength, compressive strength and wear resistance of urea - formaldehyde resin increases to a significant extent when reinforced withGrewia optivafiber. Analysis of results shows that particle reinforcement is more effective as compared to short and long fiber reinforcement. Morphological and Thermal studies of the matrix and fibre reinforced biocomposites have also been carried out

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de Olveira, Lívia Ávila, Júlio César dos Santos, Túlio Hallak Panzera, Rodrigo Teixeira Santos Freire, Luciano Machado Gomes Vieira e Juan Carlos Campos Rubio. "Investigations on short coir fibre–reinforced composites via full factorial design". Polymers and Polymer Composites 26, n.º 7 (setembro de 2018): 391–99. http://dx.doi.org/10.1177/0967391118806144.

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Over the last few decades, a significant amount of research has been focused on the use of natural fibres as reinforcement in polymers, due to their intrinsic properties such as sustainability, easy availability and processing, biodegradability and moderate mechanical strength. Among natural fibres, coir is a low-cost fibre extracted from coconut palm which is extensively produced in Brazil. A full factorial design was carried out to investigate the effects of the manufacturing and composition parameters on the mechanical and physical properties of short coir fibre–reinforced composites (SCoirFRCs). The random short fibres were mixed with epoxy polymer and compacted by uniaxial pressure. The physical and mechanical responses, namely, apparent density, impact resistance, flexural strength and modulus, were investigated under a design of experiment approach. SCoirFRCs fabricated with 35% of fibre volume fraction, 375 g/m2 of fibre grammage and HY956 epoxy hardener type achieved higher flexural modulus and impact resistance, while those consisting of 30 vol% of coir fibres, HY956 type and 300 g/m2 of grammage revealed higher flexural strength. The findings revealed that the mechanical properties of SCoirFRCs are substantially dominated by the properties of the matrix phase and fibre wettability.

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Fischlschweiger, Michael, Alexander Stock e Markus Thurmeier. "Integrated Defect Classification in Manufacturing of Carbon Fibre Reinforced Thermoplastic Polymer Matrix Composites". Materials Science Forum 879 (novembro de 2016): 554–59. http://dx.doi.org/10.4028/www.scientific.net/msf.879.554.

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Thermoplastic polymer matrix composites with continuous carbon fibre reinforcements are of crucial relevance in automotive industry. The mix of high performance and cost effective manufacturing makes them attractive for high volume production. However, it could be shown that production integrated end of line quality control is of strong importance to ensure continuous and traceable part quality. Besides, typical non destructive testing method specifications, higher production volumes additionally require short testing times. Herein, the application of active thermography as end of line quality control in composite production is evaluated and compared with results obtained by X-ray radiometry. It could be revealed that transient pulse phase thermography is a powerful tool to analyse part quality of continuous thermoplastic polymer matrix composites in short testing times.

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Liu, Xiaoling, Muhammad S. Hasan, David M. Grant, Lee T. Harper, Andrew J. Parsons, Graham Palmer, Chris D. Rudd e Ifty Ahmed. "Mechanical, degradation and cytocompatibility properties of magnesium coated phosphate glass fibre reinforced polycaprolactone composites". Journal of Biomaterials Applications 29, n.º 5 (15 de julho de 2014): 675–87. http://dx.doi.org/10.1177/0885328214541302.

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Retention of mechanical properties of phosphate glass fibre reinforced degradable polyesters such as polycaprolactone and polylactic acid in aqueous media has been shown to be strongly influenced by the integrity of the fibre/polymer interface. A previous study utilising ‘single fibre’ fragmentation tests found that coating with magnesium improved the fibre and matrix interfacial shear strength. Therefore, the aim of this study was to investigate the effects of a magnesium coating on the manufacture and characterisation of a random chopped fibre reinforced polycaprolactone composite. Short chopped strand non-woven phosphate glass fibre mats were sputter coated with degradable magnesium to manufacture phosphate glass fibre/polycaprolactone composites. The degradation behaviour (water uptake, mass loss and pH change of the media) of these polycaprolactone composites as well as of pure polycaprolactone was investigated in phosphate buffered saline. The Mg coated fibre reinforced composites revealed less water uptake and mass loss during degradation compared to the non-coated composites. The cations released were also explored and a lower ion release profile for all three cations investigated (namely Na+, Mg2+ and Ca2+) was seen for the Mg coated composite samples. An increase of 17% in tensile strength and 47% in tensile modulus was obtained for the Mg coated composite samples. Both flexural and tensile properties were investigated and a higher retention of mechanical properties was obtained for the Mg coated fibre reinforced composite samples up to 10 days immersion in PBS. Cytocompatibility study showed both composite samples (coated and non-coated) had good cytocompatibility with human osteosarcoma cell line.

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Liang, Ji-Zhao. "Predictions of tensile strength of short inorganic fibre reinforced polymer composites". Polymer Testing 30, n.º 7 (outubro de 2011): 749–52. http://dx.doi.org/10.1016/j.polymertesting.2011.06.001.

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Ansari, Reza, Masoud Ahmadi e Saeed Rouhi. "Impact resistance of short carbon fibre-carbon nanotube-polymer matrix hybrid composites: A stochastic multiscale approach". Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 235, n.º 8 (15 de junho de 2021): 1925–36. http://dx.doi.org/10.1177/14644207211015267.

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A multiscale approach is used here to investigate the impact properties of carbon fibre/carbon nanotube-reinforced polymer. For this purpose, the mechanical properties of the carbon nanotubes (CNTs) are obtained by molecular dynamics simulations. Then, they are included in the polyethene matrix, and the mechanical properties of CNT-reinforced polyethene are computed using a stochastic approach. Considering the CNT-reinforced polyethene as the matrix, the effect of adding the carbon fibres on its mechanical properties is investigated in the next step. Finally, utilizing a stochastic method, the macro-scale mechanical properties of carbon fibre/carbon nanotube-reinforced polymer are computed. Thereafter, the impact test is applied on the models. The finite element method is used to investigate the mechanical and impact properties of representative volume elements. The effects of waviness, volume percentage and aspect ratio of the carbon fibre and CNT on the mechanical properties of the multiscale composite are evaluated. It is shown that reinforcing the polyethene matrix by carbon fibres and CNTs significantly increases its impact resistance. Adding 3% and 5% volume percentages of CNT into 3%-carbon fibre/polyethene and 5%-carbon fibre/polyethene respectively, resulted in 26% and 47% improvement in the impact resistance of the composite.

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Shibata, Mitsuhiro, Ryutoku Yosomiya, Noritaka Ohta, Atsushi Sakamoto e Hiroyuku Takeishi. "Poly(∊-Caprolactone) Composites Reinforced with Short Abaca Fibres". Polymers and Polymer Composites 11, n.º 5 (julho de 2003): 359–67. http://dx.doi.org/10.1177/096739110301100502.

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The tensile properties of poly( ∊-caprolactone) (PCL) composites reinforced with short abaca fibres (length ca. 5 mm) prepared by melt mixing and subsequent injection molding were investigated and compared with PCL composites reinforced with glass fibres (GF). The influence of fibre content and surface esterification of the natural fibre on the tensile properties was evaluated. The tensile strength and moduli of all the PCL/abaca composites increased with increasing fibre content. All the PCL/abaca composites had a higher tensile strength than the PCL/GF composites when the fibre weight fraction was the same. The tensile strength of the PCL/abaca composites was improved by surface esterification of the abaca with acetic anhydride or butyric anhydride in the presence of pyridine, because of the increase in the interfacial adhesiveness between the matrix polyester and the esterificated fibre, as is obvious from the SEM photographs.

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El-Sabbagh, A., I. Taha e R. Taha. "Prediction of the Modulus of Elasticity of Short Fibre Reinforced Polymer Composites by Finite Element Modelling". Polymers and Polymer Composites 19, n.º 9 (novembro de 2011): 733–42. http://dx.doi.org/10.1177/096739111101900903.

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Recently, there has been increased interest in fibre-reinforced polymer composites, due to their distinctive specific strength, corrosion resistance and fatigue resistance, as well as high damping characteristics. In this paper, finite-element models for the prediction of the modulus of elasticity of short-fibre reinforced composites (SFRC) are introduced. The stiffness of a structure is of principal importance in many engineering applications and the modulus of elasticity is often one of the primary properties considered when selecting a material. In the developed models, different factors affecting the overall performance of such composites are considered. These factors include the respective volume fractions of the polymer matrix and fibrous reinforcement, fibre orientation and agglomeration. Three finite-element models with different sophistication levels are proposed. The models are validated by comparing the effective modulus of elasticity predicted by the different models to experimental results obtained by tensile testing SFRC samples consisting of glass fibres in a polypropylene matrix at different volume fractions.

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Pandian, Amuthakkannan, Manikandan Vairavan, Winowlin Jappes Jebbas Thangaiah e Marimuthu Uthayakumar. "Effect of Moisture Absorption Behavior on Mechanical Properties of Basalt Fibre Reinforced Polymer Matrix Composites". Journal of Composites 2014 (20 de março de 2014): 1–8. http://dx.doi.org/10.1155/2014/587980.

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The study of mechanical properties of fibre reinforced polymeric materials under different environmental conditions is much important. This is because materials with superior ageing resistance can be satisfactorily durable. Moisture effects in fibre reinforced plastic composites have been widely studied. Basalt fibre reinforced unsaturated polyester resin composites were subjected to water immersion tests using both sea and normal water in order to study the effects of water absorption behavior on mechanical properties. Composites specimens containing woven basalt, short basalt, and alkaline and acid treated basalt fibres were prepared. Water absorption tests were conducted by immersing specimens in water at room temperature for different time periods till they reached their saturation state. The tensile, flexural, and impact properties of water immersed specimens were conducted and compared with dry specimens as per the ASTM standard. It is concluded that the water uptake of basalt fibre is considerable loss in the mechanical properties of the composites.

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Shibata, Mitsuhiro, Retsu Makino, Ryutoku Yosomiya e Hiroyuku Takeishi. "Poly(Butylene Succinate) Composites Reinforced with Short Sisal Fibres". Polymers and Polymer Composites 9, n.º 5 (julho de 2001): 333–38. http://dx.doi.org/10.1177/096739110100900504.

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Poly(butylene succinate) composites reinforced with short sisal fibre were prepared by melt mixing and subsequent injection moulding. The influence of fibre length, fibre content and the surface treatment of the natural fibres on the mechanical properties of the composites were evaluated. Regarding fibre length, the tensile and flexural properties of the composites had maxima at a fibre length of about 5 mm. The flexural and tensile moduli of the composites increased with increasing fibre content. Although the tensile strength hardly changed, the flexural strength increased up to a fibre content of 10 wt%. The dynamic mechanical analysis of the composites showed that the storage moduli at above ca.-16°C (corresponding to the glass transition temperature of the matrix) increased with increasing fibre content.

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Chen, Minjie, Chaoying Wan, Yong Zhang e Yinxi Zhang. "Fibre Orientation and Mechanical Properties of Short Glass Fibre Reinforced PP Composites". Polymers and Polymer Composites 13, n.º 3 (março de 2005): 253–62. http://dx.doi.org/10.1177/096739110501300305.

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The fibre orientation and distribution in short glass fibre (SGF) reinforced polypropylene (PP) composites were measured and an orientation function ( f) was introduced to describe the fibre orientation distribution. The fibre orientation distribution in the same level plane depended on the fibre position in an injection-moulded plate. The fibres close to the boundary wall of the injection cavity were parallel to the injection direction and those close to the back wall were perpendicular to the injection direction. A commercial maleic anhydride grafted PP (MAPP) was used as a compatibilizer. With the addition of MAPP, the fibre orientation distribution in PP/SGF/MAPP composites was slightly different from that of PP/SGF, but MAPP improved the interfacial adhesion between SGF and PP and consequently the mechanical properties. The use of SGF increased the tensile strength of the PP composites from 26.5 to 45.9 MPa (73% improvement), and for the PP/MAPP/SGF composite the tensile strength increased further to 55.4 MPa. The effect of SGF on the tensile strength can be expressed by a fibre efficiency factor (λσ). The SGF efficiency factor of PP/MAPP/SGF (0.198) was 45% higher than that of PP/SGF (0.137). The impact strength of PP/MAPP/SGF (64.7 MPa) was not only higher than that of PP/SGF (40.8 MPa) by 59% but also higher than that of PP (48.3 MPa) by 34%.

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Krajangsawasdi, Narongkorn, Lourens G. Blok, Ian Hamerton, Marco L. Longana, Benjamin K. S. Woods e Dmitry S. Ivanov. "Fused Deposition Modelling of Fibre Reinforced Polymer Composites: A Parametric Review". Journal of Composites Science 5, n.º 1 (16 de janeiro de 2021): 29. http://dx.doi.org/10.3390/jcs5010029.

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Fused deposition modelling (FDM) is a widely used additive layer manufacturing process that deposits thermoplastic material layer-by-layer to produce complex geometries within a short time. Increasingly, fibres are being used to reinforce thermoplastic filaments to improve mechanical performance. This paper reviews the available literature on fibre reinforced FDM to investigate how the mechanical, physical, and thermal properties of 3D-printed fibre reinforced thermoplastic composite materials are affected by printing parameters (e.g., printing speed, temperature, building principle, etc.) and constitutive materials properties, i.e., polymeric matrices, reinforcements, and additional materials. In particular, the reinforcement fibres are categorized in this review considering the different available types (e.g., carbon, glass, aramid, and natural), and obtainable architectures divided accordingly to the fibre length (nano, short, and continuous). The review attempts to distil the optimum processing parameters that could be deduced from across different studies by presenting graphically the relationship between process parameters and properties. This publication benefits the material developer who is investigating the process parameters to optimize the printing parameters of novel materials or looking for a good constituent combination to produce composite FDM filaments, thus helping to reduce material wastage and experimental time.

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Wijayawardane, Isuru Sanjaya Kumara, Hiroshi Mutsuyoshi, Hai Nguyen e Allan Manalo. "Flexural behaviour of glass fibre-reinforced polymer and ultra-high-strength fibre-reinforced concrete composite beams subjected to elevated temperature". Advances in Structural Engineering 20, n.º 9 (21 de novembro de 2016): 1357–74. http://dx.doi.org/10.1177/1369433216677998.

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Composite beams consisting of pultruded glass fibre-reinforced polymer (GFRP) I-beams and ultra-high-strength fibre-reinforced concrete (UFC) slabs have been developed for use in short-span bridges. Fibre-reinforced polymer bolts (fibre-reinforced polymer threaded rods) and epoxy adhesive were used to connect the UFC slab to the GFRP I-beam. The authors conducted material tests and large-scale static bending tests at room and elevated temperatures (less than 90°C) to investigate the flexural behaviour of GFRP-UFC composite beams subjected to elevated temperature. The test results demonstrated that the mechanical properties of the GFRP I-beams, fibre-reinforced polymer bolts and epoxy adhesive were significantly deteriorated at elevated temperatures due to the glass transition of their polymer resin matrices. As a result, the stiffness and ultimate flexural capacity of the GFRP-UFC composite beams under elevated temperatures were significantly reduced. More than 85% of the flexural capacity of the GFRP-UFC composite beams was retained up to 60°C but that was decreased to 50% at 90°C. Fibre model analysis results confirmed that the stiffness of the GFRP-UFC composite beams is not significantly affected by actual hot environments, where there is a moderate temperature gradient across the beam cross-section.

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Wong, KJ, KO Low e HA Israr. "Impact resistance of short bamboo fibre reinforced polyester concretes". Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 231, n.º 8 (8 de outubro de 2015): 683–92. http://dx.doi.org/10.1177/1464420715609789.

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Bamboo fibre is becoming more important as reinforcement in polymer composites owing to its environment sustainability and cost effectiveness. This study examines the performance of bamboo/polyester concretes under impact loading. Specimens at fibre volume fractions of 40 vol.%, 50 vol.% and 60 vol.% and 3 mm, 7 mm and 10 mm fibre lengths were fabricated. Results showed that the optimum impact resistance was attained at 50 vol.%/10 mm, with 16.6 times higher compared to neat polyester. Scanning electron micrographs revealed that the failure mechanisms include matrix cracking, fibre/matrix debonding, fibre pull-out, fibre end damage, fibre splitting and sand particles debonding. In addition, by relating the experimental results to a theoretical model, the damage zone size was found to increase with the fibre length except at 60 vol.%/10 mm, which could be due to fibre–fibre interaction. Results suggest that bamboo fibre is a good candidate to enhance the impact resistance of polyester concrete.

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Banat, Dominik. "Load-carrying capacity of the GFRP and CFRP composite beams subjected to three-point bending test – numerical investigations". Mechanics and Mechanical Engineering 23, n.º 1 (10 de julho de 2019): 277–86. http://dx.doi.org/10.2478/mme-2019-0037.

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Abstract The subject of this article is the finite element method (FEM) simulation of the multi-layered rectangular composite beam subjected to three-point bending test. The study is focused on the composite beams made of glass or carbon fibre-reinforced laminates (glass fibre-reinforced polymer [GFRP] and carbon fibre-reinforced polymer [CFRP]) for which different laminate stacking were addressed. Three beam geometries with various length-to-thickness ratios included short beam shear (SBS) test, provided the beam is short relative to its thickness, which maximised the induced shear stresses. Simulation included the application of Tsai–Hill, Hoffman, Tsai–Wu, Hashin and Puck failure criteria to perform the composite beam failure analysis wherein the matrix and fibre failure were considered separately. Numerical failure studies also aimed to verify the beam failure modes and the participation of stress tensor elements in material failure.

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Plank, Bernhard, Christian Hannesschlaeger, Vincent Revol e Johann Kastner. "Characterisation of Anisotropic Fibre Orientation in Composites by Means of X-Ray Grating Interferometry Computed Tomography". Materials Science Forum 825-826 (julho de 2015): 868–75. http://dx.doi.org/10.4028/www.scientific.net/msf.825-826.868.

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In this work carbon fibre-reinforced polymer (CFRP) laminates and short glass fibre- reinforced polymers (sGFRP) were investigated by means of X-ray scatter dark field imaging (SDFI) using Talbot-Lau grating interferometer computed tomography. For the characterisation of the laminate structures of CFRP the anisotropic properties of the small angle scattering signal was used to image fibre bundles running in different directions. SDFI allows the visualisation of the weave pattern structure of a carbon fibre bundle in three dimensions, even if the individual fibres cannot be separated or the absorption contrast between the carbon fibres and the epoxy resin matrix is very low. For the investigated sGFRP samples qualitative information about local fibre anisotropies within a specimen were obtained by SDFI. Due to the complex behaviour of fibre alignment during the injection process a clear interpretation of the SDFI signals was difficult. As a reference method, all samples were scanned by means of high resolution cone beam Computed Tomography (µXCT). For the sGFRP the combination of µXCT and appropriate software tools provides local fibre orientations and allows three-dimensional visualisation by colour coding each extracted fibre.

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Plichta, Tomas, Veronika Sirjovova, Milan Zvonek, Gerhard Kalinka e Vladimir Cech. "The Adhesion of Plasma Nanocoatings Controls the Shear Properties of GF/Polyester Composite". Polymers 13, n.º 4 (16 de fevereiro de 2021): 593. http://dx.doi.org/10.3390/polym13040593.

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High-performance fibre-reinforced polymer composites are important construction materials based not only on the specific properties of the reinforcing fibres and the flexible polymer matrix but also on the compatible properties of the composite interphase. First, oxygen-free (a-CSi:H) and oxygen-binding (a-CSiO:H) plasma nanocoatings of different mechanical and tribological properties were deposited on planar silicon dioxide substrates that closely mimic E-glass. The nanoscratch test was used to characterize the nanocoating adhesion expressed in terms of critical normal load and work of adhesion. Next, the same nanocoatings were deposited on E-glass fibres, which were used as reinforcements in the polyester composite to affect its interphase properties. The shear properties of the polymer composite were characterized by macro- and micromechanical tests, namely a short beam shear test to determine the short-beam strength and a single fibre push-out test to determine the interfacial shear strength. The results of the polymer composites showed a strong correlation between the short-beam strength and the interfacial shear strength, proving that both tests are sensitive to changes in fibre-matrix adhesion due to different surface modifications of glass fibres (GF). Finally, a strong correlation between the shear properties of the GF/polyester composite and the adhesion of the plasma nanocoating expressed through the work of adhesion was demonstrated. Thus, increasing the work of adhesion of plasma nanocoatings from 0.8 to 1.5 mJ·m−2 increased the short-beam strength from 23.1 to 45.2 MPa. The results confirmed that the work of adhesion is a more suitable parameter in characterising the level of nanocoating adhesion in comparison with the critical normal load.

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Senapati, A. K., G. B. Nando e B. Pradhan. "Characterization of Short Nylon Fibre Reinforced Natural Rubber Composites". International Journal of Polymeric Materials 12, n.º 2 (julho de 1988): 73–92. http://dx.doi.org/10.1080/00914038808033924.

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Rajesh, C., K. C. Manoj, G. Unnikrishnan e E. Purushothaman. "Investigation on Ageing Characteristics of Short Nylon-6 Fibre Reinforced NBR Composites". Progress in Rubber, Plastics and Recycling Technology 24, n.º 4 (novembro de 2008): 239–53. http://dx.doi.org/10.1177/147776060802400402.

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The ageing characteristics of nylon 6 fibre reinforced NBR composites have been analysed by exposing them to degrading agents such as heat and gamma (γ) radiation. The effects of fibre loading, curing systems and bonding agents on the retention of tensile properties of the composite samples which were exposed to these degrading agents have been studied. The addition of fibres improves the ageing resistance of NBR. The DCP cured composites exhibit a reduction in their ability to retain the elastic modulus as the thermal ageing period increases from 7 to 14 days, whereas sulfur cured composites show a reverse trend. The efficiency for the retention of modulus of sulfur cured samples increases as the dosage of γ-radiation increases from 5 to 10 Mrad whereas a higher dose of 15 Mrad lowers it. However, the DCP cured samples show a continuous reduction in their ability to retain modulus. The composite system containing hexa-resorcinol as the bonding agent has better resistance to heat and γ-radiation than the unbonded one.

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Ashok Kumar, M., T. Maruthi Chowdary, K. Chandra Sekhar Balaji, E. Dhanunjaya Goud, S. Nagaraju, K. Shaik Ahmmed e B. Raja Sekhar. "Effects of Performance on Mechanical Properties of Sawdust/Carbon Fibre Reinforced Polymer Matrix Hybrid Composites". International Letters of Chemistry, Physics and Astronomy 54 (julho de 2015): 122–30. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.54.122.

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Short carbon fibre (CF) and sawdust (SD) were dispersed in to the epoxy (EP) matrix in order to manufacture polymer hybrid composites using compression moulding technique. The mechanical properties of flexural properties of hybrid, compression moulded, chopped CF/SD/epoxy composites have been investigated taking into account the effect of hybridization by these two fillers. Hybridization with small amounts of SD makes these CF composites more suitable for technical applications. The simultaneous compounding of epoxy with two fillers was done to obtain a hybrid composite. This system is expected to have considerable mechanical properties, good surface finish and low cost. It has been found that the tensile properties of filled epoxy were higher than unfilled epoxy. By incorporating up to 30% (by mass) Carbon fiber (CF) and 10% sawdust (SD) namely S3 sample flexural strength was increased by 12.5%. Thus it is shown that the durability of CF/SD filled epoxy composites can be enhanced by hybridization with small amount of CF. The hybrid effects of the flexural strength and modulus were studied by the rule of hybrid mixture.

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Aldousiri, B., M. Alajmi e A. Shalwan. "Mechanical Properties of Palm Fibre Reinforced Recycled HDPE". Advances in Materials Science and Engineering 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/508179.

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Recently, recycled thermoplastic polymers become an alternative resource for manufacturing industrial products. However, they have low mechanical properties compared to the thermosets. In this paper, an attempt has been made to enhance the mechanical properties of recycled high density polyethylene (HDPE) with chopped strand mat (CSM) glass fibres as a synthetic reinforcement and with short oil palm fibres as a biodegradable (natural) reinforcement. The effects of volume fraction of both synthetic and natural fibres on tensile, compression, hardness, and flexural properties of the HDPE were investigated. The failure mechanism of the composite was studied with the aid of optical microscopy. Tensile properties of the HDPE composites are greatly affected by the weight fraction of both the synthetic and the natural fibres. The higher strength of the composites was exhibited when at higher weight fraction of both natural and syntactic fibres which was about 50 MPa. Date palm fibre showed good interfacial adhesion to the HDPE despite the untreated condition used. On the other hand, treatment of the fibres is recommended for higher tensile performance of the composites.

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Czigány, Tibor. "Basalt Fiber Reinforced Hybrid Polymer Composites". Materials Science Forum 473-474 (janeiro de 2005): 59–66. http://dx.doi.org/10.4028/www.scientific.net/msf.473-474.59.

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Short fiber (basalt, carbon, ceramic, and glass) reinforced polypropylene hybrid composites were investigated to determine their mechanical properties in case of different reinforcing fiber types. The composites were reinforced with fibers and were produced by hot pressing after hot mixing techniques. Composite properties such as flexural strength, stiffness, static and dynamic fracture toughness were measured. It was realized that the main damage modes of the composites are fiber pullout and debonding. It was also found that basalt fibers are the most sensitive to the lack of the treatment with additives. These results were supported by scanning electron micrographs taken of the fracture surfaces.

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Kuncius, Tomas, Marius Rimašauskas e Rūta Rimašauskienė. "Interlayer Adhesion Analysis of 3D-Printed Continuous Carbon Fibre-Reinforced Composites". Polymers 13, n.º 10 (19 de maio de 2021): 1653. http://dx.doi.org/10.3390/polym13101653.

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Carbon fibre-reinforced materials are becoming more and more popular in various fields of industries because of their lightweight and perfect mechanical properties. Additive manufacturing technologies can be used for the production of complex parts from various materials including composites. Fused deposition modelling (FDM) is an excellent technology for the production of composite structures reinforced with short or continuous carbon fibre. In this study, modified FDM technology was used for the production of composites reinforced with continuous carbon fibre. The main aim of this study is to evaluate the shear strength of 3D-printed composite structures. The influence of printing layer height and line width on shear strength was analysed. Results showed that layer height has a significant influence on shear strength, while the influence of printing line width on shear strength is slightly smaller. Reduction of layer height from 0.4 mm to 0.3 mm allows increasing shear strength by about 40 percent. Moreover, the influence of the shear area and overlap length on shear force showed linear dependency, in which the shear area is increasing the shear force increasing proportionally. Finally, the results obtained can be used for the design and development of new 3D-printed composite structures.

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Bona, Anna. "Theoretical and Experimental Review of Applied Mechanical Tests for Carbon Composites with Thermoplastic Polymer Matrix". Transactions on Aerospace Research 2019, n.º 4 (1 de dezembro de 2019): 55–65. http://dx.doi.org/10.2478/tar-2019-0023.

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Abstract This article has a theoretical and experimental character. It presents the characteristics of two main thermoplastics used in the aerospace industry – poly ether ether ketone (PEEK) and poly phenylene sulphide (PPS). The selected materials are compounds for the production of thermoplastic polymer matrix composites. The paper presents a literature review of the application of thermoplastic polymer matrix composite materials in aviation. Additionally, the paper focuses on the characteristics of carbon fibre-reinforced polymer (CFRP) which plays an important role in the production of aerospace components. Testing methods have been chosen on the basis of the type of composite matrix. The article contains the most important mechanical properties and general characteristics of thermoplastics used as a matrix for CFRP type composites used in the aerospace industry. Individual test procedures which allow for the evaluation of mechanical properties of composite materials on a thermoplastic polymer matrix, have been described. Mechanical tests such as static tensile test and bending of short beams were carried out in order to examine CFRP composites.

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Luyt, A. S. "Natural fibre reinforced polymer composites – are short natural fibres really reinforcements or just fillers?" Express Polymer Letters 3, n.º 6 (2009): 332. http://dx.doi.org/10.3144/expresspolymlett.2009.41.

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Zabihi, Omid, Mojtaba Ahmadi, Chao Liu, Roya Mahmoodi, Quanxiang Li, Mahmoud Reza Ghandehari Ferdowsi e Minoo Naebe. "A Sustainable Approach to the Low-Cost Recycling of Waste Glass Fibres Composites towards Circular Economy". Sustainability 12, n.º 2 (15 de janeiro de 2020): 641. http://dx.doi.org/10.3390/su12020641.

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For practical applications, both environmental and economic aspects are highly required to consider in the development of recycling of fibre reinforced polymers (FRPs) encountering their end-of-life. Here, a sustainable, low cost, and efficient approach for the recycling of the glass fibre (GF) from GF reinforced epoxy polymer (GFRP) waste is introduced, based on a microwave-assisted chemical oxidation method. It was found that in a one-step process using microwave irradiation, a mixture of hydrogen peroxide (H2O2) as a green oxidiser and tartaric acid (TA) as a natural organic acid could be used to decompose the epoxy matrix of a waste GFRP up to 90% yield. The recycled GFs with ~92.7% tensile strength, ~99.0% Young’s modulus, and ~96.2% strain-to-failure retentions were obtained when compared to virgin GFs (VGFs). This short microwave irradiation time using these green and sustainable recycling solvents makes this a significantly low energy consumption approach for the recycling of end-of-life GFRPs.

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Ali, Mubarak, S. C. Joshi e Mohamed Thariq Hameed Sultan. "Palliatives for Low Velocity Impact Damage in Composite Laminates". Advances in Materials Science and Engineering 2017 (2017): 1–16. http://dx.doi.org/10.1155/2017/8761479.

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Fibre reinforced polymer laminated composites are susceptible to impact damage during manufacture, normal operation, maintenance, and/or other stages of their life cycle. Initiation and growth of such damage lead to dramatic loss in the structural integrity and strength of laminates. This damage is generally difficult to detect and repair. This makes it important to find a preventive solution. There has been abundance of research dealing with the impact damage evolution of composite laminates and methods to mitigate and alleviate the damage initiation and growth. This article presents a comprehensive review of different strategies dealing with development of new composite materials investigated by several research groups that can be used to mitigate the low velocity impact damage in laminated composites. Hybrid composites, composites with tough thermoplastic resins, modified matrices, surface modification of fibres, translaminar reinforcements, and interlaminar modifications such as interleaving, short fibre reinforcement, and particle based interlayer are discussed in this article. A critical evaluation of various techniques capable of enhancing impact performance of laminated composites and future directions in this research field are presented in this article.

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Rajesh, C., K. C. Manoj, G. Unnikrishnan e E. Purushothaman. "Thermal Characterisation of Short Nylon-6 Fibre-Reinforced NBR Composites". Polymers and Polymer Composites 17, n.º 3 (março de 2009): 133–40. http://dx.doi.org/10.1177/096739110901700302.

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He, Xiulan, Yuguang Dai, Yinggui Guo, Yu Zhou e Dechang Jia. "Effect of Polycarbosilane Content on Microstructures and Mechanical Properties of Short-Carbon-Fibre-Reinforced SiC Composites". Advanced Composites Letters 15, n.º 3 (maio de 2006): 096369350601500. http://dx.doi.org/10.1177/096369350601500301.

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Short-carbon-fibre-reinforced SiC composites were prepared by precursor pyrolysis-hot pressing with Polycarbosilane (PCS) as precursor polymer and MgO-Al2O3-Y2O3 as sintering additives. The effects of PCS content on microstructures and mechanical properties of the composites were investigated. The results showed that, the composites could be densified at a relatively low temperature of 1800? via the liquid-phase-sintering mechanism and the highest mechanical property was obtained for the composites with 20wt. % PCS content. During sintering, Y2O3, Al2O3 reacted with the pyrolysis products from PCS and formed amorphous interphase, which was benefit of densification of the composites and avoidance of degeneration of the carbon fibres. The nano PCS-derived SiC almost lied on the surface of the particle of starting powder β-SiC, which could play a role of filling up the void and improve the relative density of the composites.

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Krooß, Tim, Martin Gurka, Lien Van der Schueren, Luc Ruys, Stefan Fenske e Christopher Lenz. "Cost-Effective Microfibrillar Reinforced Composites for Lightweight Applications". Materials Science Forum 825-826 (julho de 2015): 44–52. http://dx.doi.org/10.4028/www.scientific.net/msf.825-826.44.

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Microfibrillar reinforced composites (MFC) are self-reinforced polymer-polymer composites, consisting of a cold drawn (fibrillized) phase in an isotropic matrix. They are manufactured via melt blending of two immiscible polymers with different melting temperatures, followed by a subsequent cold drawing and thermal annealing step. The present study examines the manufacturing of composite material out of melt-spun microfibrillar reinforced filaments. Polypropylene (PP) and Polyethylene terephthalate (PET) were chosen as the low-melting matrix and the high-melting reinforcement phase, respectively.The filaments were woven to flat textile structures and processed to composites via hot pressing. They represent a bidirectional reinforced composite, comparable to other fiber reinforced polymers. To ensure optimized processing the influence of relevant parameters has been investigated with respect to mechanical properties of the MFC‑filaments and the derived composites. In addition, the morphology was visualized by SEM imaging after all manufacturing steps. An important observation was that the reinforcing fibrils are still intact after thermal processing, leading to a significant increase in mechanical properties of the resulting composites. Quasistatic tensile tests show more than 100 % higher modulus and more than 50 % higher strength of the only 20 wt-% reinforced PET‑PP composites compared to neat PP. The influence of the amount of PET reinforcement, the variation in processing conditions and composite layup were investigated. Additionally, an outlook on the melt-spinning of blends with Polyamide (PA) is given. In future work it is meant to show that a broad spectrum of tailored properties can easily be achieved by such polymer blends and composites outperforming existing homopolymers as well as thermoplastic composites like short glass‑fiber‑reinforced Polypropylene.The material cost reduction thanks to adding cheaper mass‑production polymers and the transfer onto conventional manufacturing lines is meant to ensure the feasibility of industrial production. The low density and excellent recycling options of these composites underline their potential for automotive and aircraft applications.

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Sawpan, Moyeen Ahmad. "Durability of Pultruded Glass Fibre Reinforced Polymer Composite Subjected to Hygrothermal Ageing in Sea Water". Applied Mechanics and Materials 884 (agosto de 2018): 14–22. http://dx.doi.org/10.4028/www.scientific.net/amm.884.14.

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Durability of glass fibre reinforced polymer (GFRP) composite is an important research topic because the changes occur in GFRP composite with ageing can affect its properties and lifetime. For long term use, GFRP composites should be examined in real time and with reasonable in-service environments. However, this is not practical because the time involved would significantly delay product development and therefore, accelerated ageing technique is required. Conditioning in wet and elevated temperatures known as hygrothermal ageing is a very useful technique to evaluate the durability of GFRP composites in a reasonable timeframe. In this work, pultruded GFRP composites were aged in sea water and in dry conditions at 23, 55 and 75°C for 0, 8 and 20 months to assess the changes in shear properties (e.g. short beam shear strength, SBSS and transverse shear strength, TSS) and in glass transition temperature, Tg. After ageing in sea water for 20 months, SBSS was found to retain by about 101, 102 and 95% at 23, 55 and 75°C, respectively. On the other hand, SBSS was retained by around 106% after ageing in dry condition for 20 months at 55 and 75°C. TSS was found to retain by approximately 99, 95 and 91% after ageing in sea water for 20 months at 23, 55 and 75°C, respectively, whereas TSS of dry conditioned samples was retained by about 105 and 107% at 55 and 75°C, respectively. Tg, measured by dynamic mechanical thermal analyser, showed little change both in wet and dry conditions at different temperatures and time.

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Sousa, R. A., R. L. Reis, A. M. Cunha e M. J. Bevis. "Integrated compounding and injection moulding of short fibre reinforced composites". Plastics, Rubber and Composites 33, n.º 6 (agosto de 2004): 249–59. http://dx.doi.org/10.1179/174328904x3630.

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Yandrapu, Sagar, Pavan Kumar Gangineni, Soubhik De, Bankim Chandra Ray e Rajesh Kumar Prusty. "Effect of Bath Concentration during Electrophoretic Deposition on the Interfacial Behaviour of Hybrid CFRP Composites". Materials Science Forum 978 (fevereiro de 2020): 304–10. http://dx.doi.org/10.4028/www.scientific.net/msf.978.304.

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Carbon fibre reinforced polymer (CFRP) composites a perfect structural material due to their outstanding malleable strength, great rigidity, light mass and pronounced thermal resistance. But their inferior out-of-plane properties which are controlled by the matrix–fibre interface restrict the use of CFRP composites in critical applications. Amalgamation of nanofiller in the CFRP composites has found to improve the matrix-fibre interface and there by out-of-plane response. Though matrix modification has contributed to the improvement of interface, fibre modification has a scope for higher levels of nanofiller incorporation and proper fibre nanofiller adhesion. Out of several methods available for fibre modification electrophoretic deposition (EPD) is an eye-catching method for monitoring as well for nanofiller deposition. In recent ages, Graphene has grabbed wonderful consideration Among the graphene based functionalised nanofillers Carboxyl functionalized Graphene (G-COOH) modified CFRP composites have shown better ILSS properties. This research primarily aims to fabricate a CFRP composite using G-COOH modified carbon fibres with varying nanofiller concentrations of 0.5g/ltr, 1g/ltr and 1.5g/ltr in the EPD bath and its impact on the mechanical properties of the FRP composites. The laminates thus obtained were subjected to short beam shear test for the determination of inter laminar shear strength (ILSS). Fractography of the tested samples to observe various failure modes has been carried out by using scanning electron microscope (SEM).

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CHO, MYOUNG-RAE, HYUNG-ICK KIM, JAE-SOON JANG, JONGHWAN SUHR, DEVIN R. PRATE e DAVID CHUN. "INVESTIGATION OF MECHANICAL DAMPING CHARACTERISTIC IN SHORT FIBERGLASS REINFORCED POLYCARBONATE COMPOSITES". Modern Physics Letters B 27, n.º 15 (21 de maio de 2013): 1350108. http://dx.doi.org/10.1142/s021798491350108x.

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The focus of this study is to experimentally investigate the effect of debonding stress, the interface between the fibers and the polymer matrix, on the damping properties of the short fiberglass reinforced polymer composites. In this study, short fiberglass reinforced polycarbonate composite materials were fabricated and characterized for their tensile properties by varying the fiberglass loading fraction. The debonding stress was evaluated by coupling the acoustic emission technique with the tensile testing. After the determination of the debonding stress was completed, dynamic cyclic testing was performed in order to investigate the effect of debonding on the damping properties of the polymer composites. It was experimentally observed in this study that the debonding can facilitate the stick-slip friction under cyclic loadings, which then gives rise to better damping performance in the fiberglass composites.

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Salman, Suhad D., Mohaiman J. Sharba, Z. Leman, M. T. H. Sultan, M. R. Ishak e F. Cardona. "Physical, Mechanical, and Morphological Properties of Woven Kenaf/Polymer Composites Produced Using a Vacuum Infusion Technique". International Journal of Polymer Science 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/894565.

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Nowadays, due to renewable issues, environmental concerns, and the financial problems of synthetic fibres, the development of high-performance engineering products made from natural resources is increasing all over the world. Lately, kenaf fibre has been used among many different types of natural resources in various shapes. Unidirectional long fibres or randomly oriented short fibre shapes are the most common type of kenaf fibres that have been investigated in previous works. This work characterises and evaluates the physical, mechanical, and morphological properties of plain woven kenaf fabric and its composites with three types of thermoset resin at 0°/90° and 45°/−45° orientation, in order to assess their suitability as lignocellulosic reinforced polymer composites. A vacuum infusion manufacturing technique was used to prepare the specimens with fibre weight content of 35% ± 2%. Eight specimens were prepared for each test, and five replications were adopted. A total of 78 samples were tested in this study. The results show that the composites with 0°/90° had the highest tensile, flexural strengths, and modulus. The morphological properties of composite samples were analysed through scanning electron microscopy (SEM) images and these clearly demonstrated the better interfacial adhesion between the woven kenaf and the epoxy matrix.

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