Relevant bibliographies by topics / Discontinuous fiber composites

Academic literature on the topic 'Discontinuous fiber composites'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Discontinuous fiber composites"

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Zhou, Xiaodong, Qunfang Lin, and Gance Dai. "Studies on Mechanical Properties of Discontinuous Glass Fiber/Continuous Glass Mat/Polypropylene Composite." Polymers and Polymer Composites 10, no. 4 (May 2002): 299–306. http://dx.doi.org/10.1177/096739110201000405.

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The mechanical properties of discontinuous glass fiber/continuous glass fiber mat/polypropylene composites were investigated. The mechanical properties increased with increasing areal weight of the continuous glass mat, whereas the suitable content of discontinuous fiber was also depended on the mat areal weight. The impact strength of composites initially decreased due to the addition of discontinuous glass fiber, but increased when the content of discontinuous glass fiber further increased. Comparisons between the 4 mm discontinuous fiber length and the 12 mm fiber showed that the longer discontinuous glass fiber was advantageous to the mechanical properties of composite system. The modification of the interfacial adhesion between reinforcements and matrix resin by using functionalized polypropylene played a significant role in improving the mechanical properties of the composites. But the impact strength decreased above 5% of MA-g-PP level (with respect to matrix resin). It was also found that using a matrix resin with a high melt index was beneficial impregnation with the mechanical properties improving accordingly.
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Barnett, Philip R., and Hicham K. Ghossein. "A Review of Recent Developments in Composites Made of Recycled Carbon Fiber Textiles." Textiles 1, no. 3 (October 9, 2021): 433–65. http://dx.doi.org/10.3390/textiles1030023.

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Carbon fiber recycling has garnered significant attention in recent years due to the large volume of manufacturing waste and upcoming end-of-life products that will enter the waste stream as the current generation of aircraft is retired from service. Recycled carbon fibers have been shown to retain most of their virgin mechanical properties, but their length is generally reduced such that continuous fiber laminates cannot be remade. As such, these fibers are typically used in low-performance applications including injection molding, extrusion/compression molding, and 3D printing that further degrade the fiber length and resulting composite properties. However, recent advances in the processing of long discontinuous fiber textiles have led to medium- to high-performance composites using recycled carbon fibers. This review paper describes the recent advances in recycled carbon fiber textile processing that have made these improvements possible. The techniques used to manufacture high-value polymer composites reinforced with discontinuous recycled carbon fiber are described. The resulting mechanical and multifunctional properties are also discussed to illustrate the advantages of these new textile-based recycled fiber composites over the prior art.
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Zhang, Qiang, Henry Hu, and Jason Lo. "Solidification of Discontinuous Al2O3 Fiber Reinforced Magnesium (AM60) Matrix Composite." Defect and Diffusion Forum 312-315 (April 2011): 277–82. http://dx.doi.org/10.4028/www.scientific.net/ddf.312-315.277.

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Magnesium matrix composites have great potential for aerospace and automotive applications due to its low density and superior specific stiffness. The magnesium composites can often be reinforced by either particles or/and fibers. There were certain studies on solidification behaviors of particle-reinforced magnesium composites in the past. However, development of grain structure during the solidification of fibre-reinforced magnesium is barely investigated. In this work, an Al2O3 fiber reinforced magnesium (AM60) matrix composite (AM60/Al2O3,f) was cast. The solidification behavior of the cast AM60/Al2O3,f composite was investigated by computer-based thermal analysis. Optical and scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) were employed to examine the occurrence of nucleation and grain refinement involved in solidification of the composite. The results show that the addition of Al2O3 fibers leads to the formation of fine grain structure in the matrix of the AM60/Al2O3,f composite. The refinement of grain structure should be primarily attributed to the restriction of grain growth by the limited cellular space formed in the skeleton of the fiber preform structure instead of the nucleation of primary -Mg phase directly on Al2O3 fibers.
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Petersen, R. C. "Discontinuous Fiber-reinforced Composites above Critical Length." Journal of Dental Research 84, no. 4 (April 2005): 365–70. http://dx.doi.org/10.1177/154405910508400414.

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Micromechanical physics of critical fiber length, describing a minimum filament distance for resin impregnation and stress transfer, has not yet been applied in dental science. As a test of the hypothesis that 9-micron-diameter, 3-mm-long quartz fibers would increase mechanical strength over particulate-filled composites, photocure-resin-pre-impregnated discontinuous reinforcement was incorporated at 35 wt% into 3M Corporation Z100, Kerr Corporation HerculiteXRV, and an experimental photocure paste with increased radiopaque particulate. Fully articulated four-point bend testing per ASTM C 1161-94 for advanced ceramics and Izod impact testing according to a modified unnotched ASTM D 256-00 specification were then performed. All photocure-fiber-reinforced composites demonstrated significant improvements over particulate-filled compounds (p < 0.001) for flexural strength, modulus, work of fracture, strain at maximum load, and Izod toughness, with one exception for the moduli of Z100 and the experimental reinforced paste. The results indicate that inclusion of pre-impregnated fibers above the critical aspect ratio yields major advancements regarding the mechanical properties tested.
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He, Jingjing, Junping Shi, Yong Zhang, Yali Bi, and Lihao Fan. "Effect of Fractal-Based Fiber Clustering on Tensile Properties of BFRP." Advances in Civil Engineering 2021 (July 6, 2021): 1–9. http://dx.doi.org/10.1155/2021/3382200.

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To explore the clustering phenomenon of discontinuous fibers in composite materials, this paper deduces the fiber uniform distribution coefficient and analytical expressions of fiber clustering content based on fractal theory and establishes a tensile strength prediction model of fiber/epoxy resin composite materials containing cluster fibers. With basalt fiber/epoxy resin composites (BFRP) as an example, this paper analyzes the tensile strength law of BFRP under fiber clustering effect. The results show that when the fiber volume fraction is constant, the tensile strength of the composite in the presence of agglomerated fibers is only related to the fractal dimension of the circumference and cross-sectional area of the inner fiber agglomerate. The calculated value of the composite tensile strength based on fractal theory is lower than the experimental value, but closer to the experimental value than the approximate method. The research conclusions can provide theoretical support for strength prediction of fiber/epoxy resin composites.
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Kuriger, Rex J., M. Khairul Alam, and David P. Anderson. "Strength prediction of partially aligned discontinuous fiber-reinforced composites." Journal of Materials Research 16, no. 1 (January 2001): 226–32. http://dx.doi.org/10.1557/jmr.2001.0035.

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An experimental and theoretical approach has been described for the determination of the strength of partially aligned discontinuous fiber-reinforced composites. The fiber alignment information was obtained as a Gaussian or normal distribution function by using an x-ray-diffraction technique. The distribution function was then used in the composite strength equation to calculate the theoretical strength. This approach was applied to a composite of vapor grown carbon fiber (VGCF) in a polypropylene matrix, and the experimental and theoretical results were compared. As expected, the composite strength increased with increase in fiber volume fraction and the degree of fiber alignment. It was also observed that the composite strength was sensitive to variation in fiber length when the average fiber length was less than the critical fiber length. At higher fiber volume fractions the composite strength was much lower than predicted by theory. This is most likely due to incomplete wetting and infiltration of the VGCF.
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Li, Victor C., and Hwai-Chung Wu. "Conditions for Pseudo Strain-Hardening in Fiber Reinforced Brittle Matrix Composites." Applied Mechanics Reviews 45, no. 8 (August 1, 1992): 390–98. http://dx.doi.org/10.1115/1.3119767.

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Apart from imparting increased fracture toughness, one of the useful purposes of reinforcing brittle matrices with fibers is to create enhanced composite strain capacity. This paper reviews the conditions underwhich such a composite will exhibit the pseudo strain-hardening phenomenon. The presentation is given in a unified manner for both continuous aligned and discontinuous random fiber composites. It is demonstrated that pseudo strain-hardening can be practically designed for both types of composites by proper tailoring of material structures.
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Haldar, Amit Kumar, and S. Senthilvelan. "Notch Effect on Discontinuous Fiber Reinforced Thermoplastic Composites." Key Engineering Materials 471-472 (February 2011): 173–78. http://dx.doi.org/10.4028/www.scientific.net/kem.471-472.173.

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Increasing utilization of thermoplastic composites in the structural application necessitates understanding of damage tolerance characteristics. In this work, unreinforced, 20 % short, 20 % long glass fiber reinforced polypropylene were injection molded and considered. Test specimens with different notch sizes were tested under static as well as fatigue loading conditions. Under static load condition, short fiber reinforced and unreinforced test material exhibited notch strengthening effect; whereas long fiber reinforced material exhibited notch weakening effect. Failure morphology under fatigue condition exhibited the influence of notch size and length of reinforced fibers over performance. Significant difference between notched and unnotched specimens is observed at low cycle fatigue and very less difference in performance is observed at high cycle fatigue condition.
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Butenegro, José Antonio, Mohsen Bahrami, Yentl Swolfs, Jan Ivens, Miguel Ángel Martínez, and Juana Abenojar. "Novel Thermoplastic Composites Strengthened with Carbon Fiber-Reinforced Epoxy Composite Waste Rods: Development and Characterization." Polymers 14, no. 19 (September 21, 2022): 3951. http://dx.doi.org/10.3390/polym14193951.

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The increasing use of carbon fiber and epoxy resin composite materials yields an increase in the amount of waste. Therefore, we present a solution consisting of composites manufactured by hot pressing, employing polyamides (either PA11 or PA12) and a mechanically recycled carbon fiber-reinforced polymer (CFRP) as reinforcement. The main objectives are to study the manufacturing of those composites, to evaluate the fiber distribution, and to perform a mechanical, dynamical, and thermomechanical characterizations. The X-ray micro-computed tomography (μCT) shows that the fibers are well-distributed, maintaining a homogeneous fiber volume fraction across the material. The variability in the results is typical of discontinuous fiber composites in which the fibers, although oriented, are not as homogeneously distributed as in a continuous fiber composite. The mechanical and dynamic properties barely differ between the two sets of composites. A dynamic-mechanical analysis revealed that the glass transition temperature (Tg) increases slightly for both composites, compared to the polymers. These results illustrate the viability of the recycling and reuse route for preventing the deterioration of carbon fibers and promoting the subsequent reduction in the environmental impact by employing a thermoplastic matrix.
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Hwang, S. J., and R. F. Gibson. "Micromechanical Modeling of Damping in Discontinuous Fiber Composites Using a Strain Energy/Finite Element Approach." Journal of Engineering Materials and Technology 109, no. 1 (January 1, 1987): 47–52. http://dx.doi.org/10.1115/1.3225932.

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The purpose of this paper is to describe the development and demonstrate the application of an efficient method for finite element modeling of damping and stiffness of discontinuous fiber reinforced composites. Dynamic stiffness and damping are defined in terms of the complex modulus, and composite damping is estimated by means of a strain energy method. This technique has the capability of predicting fiber interaction and fiber interface effects on composite damping. The resulting data from the analytical approaches, including the finite element method (FEM) and a “mechanics of materials” analysis, were compared with previous experimental results. These results showed that fiber interaction does affect the damping of discontinuous fiber composites, and that damping can be improved by increasing the fiber end gap size or by decreasing the fiber aspect ratio. It is also shown that the finite element implementation of the strain energy approach is a powerful tool for predicting the damping in composites.
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Dissertations / Theses on the topic "Discontinuous fiber composites"

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Kunc, Vlastimil. "Structure-property relationships in flow formed discontinuous fiber reinforced composites." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/52934.

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This dissertation presents a new method for obtaining fully anisotropic stiffness tensor for materials containing discontinuous curverd fibers. It is demonstrated that the definition of fiber configuration and configuration averaging allow us to obtain better match with experimental results when compared to theory relying on the assumption of straight fibers. The experimental results are obtained using novel X-ray micro-tomography setup allowing observation of material microstructure under load.
Ph. D.
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Dibelka, Jessica Anne. "Mechanics of Hybrid Metal Matrix Composites." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/50579.

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The appeal of hybrid composites is the ability to create materials with properties which normally do not coexist such as high specific strength, stiffness, and toughness. One possible application for hybrid composites is as backplate materials in layered armor. Fiber reinforced composites have been used as backplate materials due to their potential to absorb more energy than monolithic materials at similar to lower weights through microfragmentation of the fiber, matrix, and fiber-matrix interface. Composite backplates are traditionally constructed from graphite or glass fiber reinforced epoxy composites. However, continuous alumina fiber-reinforced aluminum metal matrix composites (MMCs) have superior specific transverse and specific shear properties than epoxy composites. Unlike the epoxy composites, MMCs have the ability to absorb additional energy through plastic deformation of the metal matrix. Although, these enhanced properties may make continuous alumina reinforced MMCs advantageous for use as backplate materials, they still exhibit a low failure strain and therefore have low toughness. One possible solution to improve their energy absorption capabilities while maintaining the high specific stiffness and strength properties of continuous reinforced MMCs is through hybridization. To increase the strain to failure and energy absorption capability of a continuous alumina reinforced Nextel" MMC, it is laminated with a high failure strain Saffil® discontinuous alumina fiber layer. Uniaxial tensile testing of hybrid composites with varying Nextel" to Saffil® reinforcement ratios resulted in composites with non-catastrophic tensile failures and an increased strain to failure than the single reinforcement Nextel" MMC. The tensile behavior of six hybrid continuous and discontinuous alumina fiber reinforced MMCs are reported, as well as a description of the mechanics behind their unique behavior. Additionally, a study on the effects of fiber damage induced during processing is performed to obtain accurate as-processed fiber properties and improve single reinforced laminate strength predictions. A stochastic damage evolution model is used to predict failure of the continuous Nextel" fabric composite which is then applied to a finite element model to predict the progressive failure of two of the hybrid laminates.
Ph. D.
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Lu, Yunkai. "Mechanical Properties of Random Discontinuous Fiber Composites Manufactured from Wetlay Process." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/34503.

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The random discontinuous fiber composite has uniform properties in all directions. The wetlay process is an efficient method to manufacture random discontinuous thermoplastic preform sheets that can be molded into random composite plaques in the hot-press. Investigations were done on the molding parameters that included the set-point mold pressure, set-point mold temperature and cooling methods. The fibers used in the study included glass and carbon fiber. Polypropylene (PP) and Polyethylene Terephthalate (PET) were used as the matrix. Glass/PP and Glass/PET plaques that had fiber volume fractions ranging from 0.05 to 0.50 at an increment of 0.05 were molded. Both tensile and flexural tests were conducted. The test results showed a common pattern, i.e., the modulus and strength of the composite increased with the fiber volume fraction to a maximum and then started to descend. The test results were analyzed to find out the optimal fiber volume fraction that yielded the maximum modulus or strength. Carbon/PET composites plaques were also molded to compare their properties with Glass/PET composite at similar fiber volume fractions. Micrographs were taken of selected specimens to examine the internal structure of the material. Existing micromechanics models that predict the tensile modulus or strength of random fiber composites were examined. Predictions from some of the models were compared with test data.
Master of Science
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Suwatnodom, Prechaporn. "3-D micromechanical damage models, fiber pullout models and fracture toughness of discontinuous steel fiber reinforced cementitious composites." Diss., Restricted to subscribing institutions, 2008. http://proquest.umi.com/pqdweb?did=1562125051&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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Harper, Lee Thomas. "Discontinuous carbon fibre composites for automotive applications." Thesis, University of Nottingham, 2006. http://eprints.nottingham.ac.uk/10246/.

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Increasingly stringent emissions targets are encouraging vehicle manufacturers to prioritise reduction of vehicle mass. The falling cost of carbon fibre is increasing the viability of lightweight carbon-based body panel systems across a broad range of production volumes. In the present work an automated process has been developed for the manufacture of random fibre preforms at medium volume production levels (30-50,000ppa). This thesis seeks to understand the influence of key microstructural parameters on the mechanical and physical properties of carbon fibre laminates produced by directed fibre preforming. The principal parameters studied are fibre length, tow filament count and laminate thickness. A statistical process simulation has been developed to predict preform density variation and the results are compared with experimental tensile properties. Experimental studies have shown that there is a notable reduction in areal density variation and consequently an increase in tensile properties with shorter fibres (115mm to 6mm) and thicker laminates (1.5mm to 4mm for a constant volume fraction). Shorter lengths improved preform coverage and gave higher tensile strength, whilst thicker laminates reduced the presence of unreinforced areas which cause stress concentrations. Tow filamentisation has been induced by pneumatic means to reduce the mean filament count and maximise the mechanical performance when using inexpensive, 24K bundles. By maximising the level of filamentisation both stiffness and strength can be increased by 20% and 45% respectively. An analytical stiffness model is presented to predict the effect of tow filament count on the in-plane elastic constants. Filament count and out-of-plane fibre orientation distributions are determined from optical microscopy and are incorporated into a multi-level Mori-Tanaka based model. Predictions are within 8% of the experimental data for laminates containing large fibre bundles and 10% for laminates with highly filamentised bundles. An expression for critical bundle length has been developed for more accurate strength prediction, based on the number of filaments within the bundle. Experimental results confirm that the critical tow length is proportional to the tow filament count. Directed fibre preforming has been benchmarked against other competing processes in respect of mechanical properties, weight saving potential and cost. A full-scale demonstrator component has been manufactured using a variety of carbon composite solutions, which can all provide 40 to 50% weight saving for an equivalent bending stiffness to steel and greatly improved dent resistance. Directed fibre preforming has shown great promise for both semi-structural and structural components for medium volume applications, particularly when aligned fibres are introduced. The results from this work can be directly scaled for industrial application to provide a cost effective, lightweight alternative to steel.
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Qian, Connie Cheng. "Structural optimisation of discontinuous carbon fibre composites." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14542/.

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There has been a growing interest in using discontinuous carbon fibre composites for semi-structural applications within the automotive industry. The main advantages of discontinuous fibres are low material costs, low wastage and low touch labour compared with processes using carbon fibre textiles. Directed Carbon Fibre Preforming (DCFP) is an automated process for producing complex 3D preforms for liquid moulding. DCFP offers the potential for producing highly optimised structures, with local control over tow size, fibre length and volume fraction within the component. The execution of this is challenging however, as confidence in the current library of material properties is low and existing structural optimisation packages only consider a very limited number of design variables, which are restricted to more conventional composite materials. This thesis aims to establish a structural design tool to exploit the design freedom offered by the DCFP process. A large number of parameters associated with the fibre architecture can be controlled to meet a range of design criterions such as performance, weight and cost. The optimisation tool is capable of generating locally varied fibre areal mass and thickness maps that are suitable for manufacture by the robot controlled process. The developed model adopts a multi-scaled finite element approach. Meso-scale simulations are performed to establish size effects in discontinuous fibre composites, to quantify the level of stochastic variability and to determine the representative volume element for a given fibre architecture. A DCFP material database is generated to facilitate macro-scale modelling at the component level. The macro-scale model iteratively redistributes material in order to minimise the total strain energy of the model under prescribed loading conditions. The optimised model is segmented into areas of uniform areal mass, where the zone geometries are tailored to achieve representative material properties according to the meso-scale results, whilst ensuring the design is fit for manufacture. An automotive spare wheel well has been chosen as a demonstrator component, enabling two DCFP architectures to be compared against a continuous glass/carbon fibre NCF design. The first case offers a high performance (high specific stiffness) solution and the second offers a low cost option using high filament count tows. Following optimisation, results suggest that a 3K 25mm fibre length DCFP option can achieve a specific stiffness 52% higher than the glass/carbon baseline design, but for 1.33 times higher material cost. Alternatively, the specific stiffness of a 24K 50mm fibre length DCFP is marginally lower than the first option, but still out-performs the baseline for just 67% of the material cost. The structural optimisation method demonstrates that discontinuous fibre composites can compete against continuous fibre counterparts for semi-structural applications.
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Bond, Michael David. "Multi-scale modelling of discontinuous carbon fibre reinforced composites." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/28879/.

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Discontinuous carbon fibre composites are becoming increasingly popular in the automotive and aerospace sectors, as an alternative to textile-based fibre reinforced composites for both semi-structural and structural components. Materials are highly heterogeneous, with the random architecture leading to uncertainties when modelling and predicting mechanical performance. The microscopic characteristics are known to dominate the strength of the composite, which need to be correctly represented to improve mechanical property predictions at the macroscale. This thesis presents a multi-scale modelling approach that captures the effects of microstructural (filament level) parameters at the macro scale (component level) to predict the mechanical properties of discontinuous composite materials. In the present work, a continuum damage approach has been used to initiate and monitor failure in the models at all scales, via a user defined material (UMAT), allowing strength predictions to be made for the discontinuous material within the ABAQUS solver. Experimental testing of the material constituents (fibre bundle and matrix materials) has been performed to provide input data for the finite element analyses. Micromechanical models have been developed to calculate the properties of fibre bundles, which are used directly at the meso and macroscale. Debonding criterion has also been established and validated which has been used to demonstrate that a small interface, with a thickness of only 1% of the fibre radius, can strongly influence the stress transfer between fibre and matrix materials. Interactions between multiple fibre bundles have been considered at the mesoscale, at a range of bundle orientations and separation distances. As the separation distance between the fibre bundles decreased there was an increase in stiffness 0 f the unit cell (~1.9%) across the bundle orientations considered, however, this also coincided with greater stress concentrations (up to 9.6%) being found in the bundles aligned to the direction of loading. These stress concentrations have been used to produce a comprehensive stiffness reduction scheme at the macro scale to account for the 3D nature of the bundle interactions. A 2D macro scale model is presented for generating discontinuous random fibre architectures consisting of high filament count bundles, with interfacial debonding permitted between the bundle and matrix materials. The fibre bundles are deposited randomly in a 2D plane to provide a representative material. The model has shown that the interface between the bundle and matrix material is critical at short fibre bundle lengths (~5mm) when determining the mechanical properties of the material, with reductions in strength of up to 40% observed at low interfacial shear strengths. The results from the macro scale analysis for discontinuous materials provide predictions within ~10% for tensile stiffness and ~18% for tensile strength when compared with experimental validations.
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Lopez, Delphine. "Comportement d’un thermoplastique renforcé de fibres de verre soumis à des chargements thermo-mécaniques." Thesis, Lorient, 2018. http://www.theses.fr/2018LORIS488/document.

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Les composites à matrice polymère sont de plus en plus utilisés dans le secteur automobile. Afin de remplir les conditions exigeantes du cahier des charges vis-à-vis des conditions de mise en service, les pièces en composite doivent maintenir leur forme géométrique sous des conditions thermo-mécaniques parfois extrêmes. Par exemple, un assemblage de hayon composite est soumis à des contraintes mécaniques élevées associées à des variations de température importantes lors des essais de validation du cahier des charges. Les enjeux de la thèse sont axés sur l’aide à la conception dans le domaine quasi-statique de pièces industrielles injectées en thermoplastique renforcé de fibres discontinues. L’amélioration des outils numériques doit permettre un dimensionnement virtuel optimal de ces pièces en anticipant les variations rencontrées en service et les distorsions résiduelles résultantes de chargements thermo-mécaniques. Cette démarche s’appuie sur la connaissance du comportement thermo-mécanique du matériau de l’étude, celui du renfort de hayon, un polypropylène renforcé à 40% en masse de fibres de verre discontinues, et sur la modélisation du comportement de ce type de matériau
Discontinuous fibers reinforced thermoplastic materials have been widely used for several years in the automotive industry. These parts must resist demanding service life conditions and must meet thermo- mechanical specifications. Indeed, structural automotive spare parts have to endure high temperatures, like a few tens of degrees Celsius, for a long duration, at least a few hours. As an example, a structural part of tailgate is subject to high mechanical loading, associated to strong temperature variations, during the validation test, regarding specifications. The purpose of this work is to improve the design of complex industrial parts, like the tailgate in quasi-static domain, by relying on numerical simulation. One of the challenges related to the use of such material, is to have a reliable virtual design of industrial parts by predicting the geometrical variations during service life conditions, and residual strain. Therefore, it is necessary to characterize and to model the thermo-mechanical behavior of the tailgate material, a polypropylene matrix reinforced with discontinuous glass fibers, with a given mass fraction of 40%
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Poumadère, Thomas. "Etude du couplage procédé/propriétés d’un matériau à fibres discontinues de carbone et à matrice époxy mis en oeuvre par un procédé innovant d’injection/transfert." Thesis, Toulouse, ISAE, 2013. http://www.theses.fr/2013ESAE0003.

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Les matériaux composites sont largement utilisés dans l'aéronautique où leurs hautes performances mécaniques combinées à leur légèreté leur permettent de concurrencer les matériaux métalliques. Cependant il est aujourd'hui difficile de fabriquer en série des pièces structurales ayant des formes tridimensionnelles complexes,Si les procédés d'injection de thermoplastiques chargés de fibres courtes (100 à 1 mm) sont bien connus, les études sur l'injection des thermodurcissables à fibres longues sont rares en raison de la difficulté à les faire s'écouler sur plusieurs dizaines de millimètres pour remplir complètement les moules.La société Equip'Aéro Technique a initié des travaux portant sur le développement d'un nouveau procédé de fabrication par injection-transfert (PIMOC) de composites thermodurcissables à fibres longues (> 1 mm) discontinues. Il permet de réaliser en une seule étape des pièces aux formes tridimensionnelles sans usinage.Dans ce travail de thèse le procédé d'injection-transfert a été mis au point et fiabilisé. Ses paramètres principaux ont été identifiés. L'influence des paramètres de fabrication sur les propriétés du matériau a été établie. Les propriétés mécaniques ont ainsi pu être optimisées. Enfin, un modèle de comportement élastique endommageable avec rupture et basé sur une approche multi-critères a été développé dans le but d'initier une méthodologie de dimensionnement de pièces composites à fibres discontinues. Ces critères d'endommagement et de rupture ont été développés en accord avec les observations du comportement mécanique du matériau. L'ensemble des résultats expérimentaux et numériques a été appliqué à la fabrication et au dimensionnement d'un démonstrateur technologique
Composite materials are widely used in aeronautics. Their high mechanical properties combined to their lightness make it possible for thern to compete With metallic materials. However mass production of complex 3D shape composite structural parts is not usual.Injection process of short fibers (100um à 1 mm) filted thermoplastics is well known. Nevertheless there are few studies about long fibers (>1 mm) filled thermosets. It is very difficult to make the material flow into a closed mold.Equip iAéro Technique carried out research on the deve(opment of a new injection-transfer process (called PIMOC) to manufacture long discontinuous fibers filled thermoset composites. This process makes it possible to produce one shot complex 3D shape parts without machining.ln this work, the injection-transfer process has been developed and is now reliable. Its main parameters have been identified. The influence of manufacuring parameters on material properties have been determined, Thus mechanical properties have been optimizecl. Finally an elastic damage model has been devetoped in order to introduce a methodology or sizing discontinuous fibers composite parts. The model includes failure and is based on a multi-criteria approach. Theses damage and failure criteria have been deveioped according to observations of material mechanical behavior. Experimental and numerical results have been applied for sizing and manufacturing a technical demonstrator
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Nicholls, Tristan Kit. "Adhesive bonding of discontinuous carbon fibre composites : an experimental investigation." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13773/.

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The excellent specific stiffness and strength of carbon fibre reinforced polymer composites means that the automotive sector has been investigating methods of implementing these materials into structurally demanding applications. The work detailed within this thesis supports ongoing research at the University of Nottingham into the automated manufacture of discontinuous carbon fibre reinforced polymer composite materials. Advances in the automation of composites manufacturing has meant that methods to effectively join these materials is required. This work provides a fundamental understanding of the differences that result from the adhesive bonding of a discontinuous fibre composite (DFC) compared to conventional fibre reinforced composite materials. The main objective of the project was to characterise the behaviour of adhesively bonded DFC adherends. Using a single lap shear joint geometry, an optimised fibre architecture and joint geometry was identified with a 2-part low temperature curing epoxy adhesive being characterised for industrial application. To further improve the performance of the DFC substrates, a fibre alignment technique was implemented that achieved properties comparable to those of more traditional non-crimp fabric composites. From the experimental investigations conducted, the use of discontinuous carbon fibre reinforced composites in bonded assemblies shows promise with the potential for use in structural applications.
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Books on the topic "Discontinuous fiber composites"

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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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Discontinuous Fiber Composites. MDPI, 2018. http://dx.doi.org/10.3390/books978-3-03897-492-5.

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Discontinuous Fiber Composites, Volume II. MDPI, 2021. http://dx.doi.org/10.3390/books978-3-0365-1291-4.

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Discontinuous Fiber-Reinforced Composites: Fundamentals and Applications. Hanser Publications, 2019.

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1933-, Richardson David E., and United States. National Aeronautics and Space Administration., eds. Micro-mechanical analysis of damage growth and fracture in discontinuous fiber reinforced metal matrix composites. Clemson, S.C: Dept. of Mechanical Engineering, Clemson University, 1991.

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1933-, Richardson David E., and United States. National Aeronautics and Space Administration., eds. Micro-mechanical analysis of damage growth and fracture in discontinuous fiber reinforced metal matrix composites: Semi-annual report. Clemson, S.C: Dept. of Mechanical Engineering, Clemson University, 1990.

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National Aeronautics and Space Administration (NASA) Staff. Micro-Mechanical Analysis of Damage Growth and Fracture in Discontinuous Fiber Reinforced Metal Matrix Composites. Independently Published, 2019.

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Goh, Kheng Lim. Discontinuous-Fibre Reinforced Composites: Fundamentals of Stress Transfer and Fracture Mechanics. Springer, 2017.

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Goh, Kheng Lim. Discontinuous-Fibre Reinforced Composites: Fundamentals of Stress Transfer and Fracture Mechanics. Springer, 2018.

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Center, Langley Research, ed. Testing and analysis of curved frame specimens made from a long discontinuous fiber (LDF) material. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1993.

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Book chapters on the topic "Discontinuous fiber composites"

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Osswald, Paul V., and Tim A. Osswald. "Mechanics of Composites." In Discontinuous Fiber-Reinforced Composites, 177–215. München: Carl Hanser Verlag GmbH & Co. KG, 2020. http://dx.doi.org/10.3139/9781569906958.005.

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Gandhi, Umesh N., Sebastian Goris, Tim A. Osswald, and Yu-Yang Song. "Introduction." In Discontinuous Fiber-Reinforced Composites, 1–27. München: Carl Hanser Verlag GmbH & Co. KG, 2020. http://dx.doi.org/10.3139/9781569906958.001.

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Gandhi, Umesh N., Sebastian Goris, Tim A. Osswald, and Yu-Yang Song. "Materials." In Discontinuous Fiber-Reinforced Composites, 29–58. München: Carl Hanser Verlag GmbH & Co. KG, 2020. http://dx.doi.org/10.3139/9781569906958.002.

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Gandhi, Umesh N., Sebastian Goris, Tim A. Osswald, and Yu-Yang Song. "Manufacturing Processes." In Discontinuous Fiber-Reinforced Composites, 59–94. München: Carl Hanser Verlag GmbH & Co. KG, 2020. http://dx.doi.org/10.3139/9781569906958.003.

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Gandhi, Umesh N., Sebastian Goris, Tim A. Osswald, and Yu-Yang Song. "Microstructure in Discontinuous Fiber-Reinforced Composites." In Discontinuous Fiber-Reinforced Composites, 95–176. München: Carl Hanser Verlag GmbH & Co. KG, 2020. http://dx.doi.org/10.3139/9781569906958.004.

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Gandhi, Umesh N., Sebastian Goris, Tim A. Osswald, and Yu-Yang Song. "Modeling and Simulation of Discontinuous Fiber-Reinforced Composites." In Discontinuous Fiber-Reinforced Composites, 217–59. München: Carl Hanser Verlag GmbH & Co. KG, 2020. http://dx.doi.org/10.3139/9781569906958.006.

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Tseng, Huan-Chang, Jim Hsu, Anthony Yang, Sebastian Goris, Yu-Yang Song, Umesh N. Gandhi, and Tim A. Osswald. "Process Simulation for Discontinuous Fibers." In Discontinuous Fiber-Reinforced Composites, 261–310. München: Carl Hanser Verlag GmbH & Co. KG, 2020. http://dx.doi.org/10.3139/9781569906958.007.

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Gandhi, Umesh N., Sebastian Goris, Tim A. Osswald, and Yu-Yang Song. "Case Studies to Demonstrate Application of Multiscale Modeling for Fiber-Reinforced Polymers." In Discontinuous Fiber-Reinforced Composites, 311–70. München: Carl Hanser Verlag GmbH & Co. KG, 2020. http://dx.doi.org/10.3139/9781569906958.008.

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Gandhi, Umesh N., Sebastian Goris, Tim A. Osswald, and Yu-Yang Song. "Special Topic: Compression Molding of Discontinuous Fiber Material." In Discontinuous Fiber-Reinforced Composites, 371–432. München: Carl Hanser Verlag GmbH & Co. KG, 2020. http://dx.doi.org/10.3139/9781569906958.009.

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Gandhi, Umesh N., Sebastian Goris, Tim A. Osswald, and Yu-Yang Song. "Special Topics in CAE Modeling of Composites." In Discontinuous Fiber-Reinforced Composites, 433–59. München: Carl Hanser Verlag GmbH & Co. KG, 2020. http://dx.doi.org/10.3139/9781569906958.010.

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Conference papers on the topic "Discontinuous fiber composites"

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JAYARAM, ROHITH, SEUNGHYUN KO, JINKYU YANG, and MARCO SALVIATO. "Delamination Resistance and Size Effect in Discontinuous Fiber Composites." In American Society for Composites 2018. Lancaster, PA: DEStech Publications, Inc., 2018. http://dx.doi.org/10.12783/asc33/26000.

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Creasy, Terry S., and Suresh G. Advani. "Elongational Flow of Long Discontinuous Fiber Composites." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0484.

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Abstract Two fiber/polymer composite systems provided an opportunity to determine the dominant properties that set the behavior of the systems in extensional flow. Industrial users are interested in these systems for the savings of process time and labor they may bring to high strength composite construction. To understand the basic behavior of highly aligned fiber systems, the paper presents a model system designed to provide extensional data at low and moderate fiber aspect ratio and a high aspect ratio system. The model system shows the trend to a shift from neat polymer elongational response to a shear flow dominated response as the aspect ratio increases. The high aspect ratio system demonstrates the effect of extreme filament length on the transient response.
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CUTTING, REBECCA A., ANTHONY J. FAVALORO, JOHNATHAN E. GOODSELL, and R. BYRON PIPES. "Determining Elastic Properties from the Dynamic Response of Discontinuous Fiber Composites." In American Society for Composites 2017. Lancaster, PA: DEStech Publications, Inc., 2017. http://dx.doi.org/10.12783/asc2017/15204.

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NIAZI, SINA, AIMANE NAJMEDDINE, and MARYAM SHAKIBA. "A 3D THERMO-MECHANICAL ANALYSIS OF ADDITIVELY MANUFACTURED ALIGNED DISCONTINUOUS FIBER-REINFORCED COMPOSITES." In Proceedings for the American Society for Composites-Thirty Seventh Technical Conference. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/asc37/36471.

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This work investigates the effects of thermal residual stresses due to curing processes on the mechanical and failure responses of additively manufactured aligned discontinuous fiber-reinforced composites (DFRCs). A micro-mechanical framework is used for finite element simulation of damage and failure in the three-dimensional (3-D) representation of the DFRCs under both mechanical and thermal loadings. In this numerical framework, accurate constitutive equations are utilized to explicitly simulate the fibers, matrix, and fiber/matrix interfaces within the composite’s microstructure. All parameters of the micro-mechanical model are defined based on a recently developed 3-D printed aligned discontinuous fiber-reinforced thermoset. The coupled thermo-mechanical model on the commercially available nonlinear finite element software ABAQUS is used to accurately model the response of the studied DFRC when exposed to different curing temperatures and to mechanical loading. Intermediate fibers’ aspect ratios (FARs) and low fibers’ volume fraction are used, which are suitable for 3-D printed aligned DFRCs. The curing-induced residual stresses are then studied, and the effects of different curing processes on the onset of different damage types and on the stress-strain response up to final failure are predicted. Also, the effect of the perfect versus cohesive interfacial bonding on the DFRC’s performance is examined. This work reveals that the DFRCs’ responses are significantly affected when thermal residual stresses due to curing are considered, and therefore, provides guidance for better design, manufacturing, and analysis of such composites.
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Haldar, Amit Kumar, Ishan Aggarwal, and N. K. Batra. "Damping behavior of Discontinuous Fiber Reinforced Thermoplastic Composites." In INTERNATIONAL CONFERENCE ON PHYSICAL MESOMECHANICS OF MULTILEVEL SYSTEMS 2014. AIP Publishing LLC, 2010. http://dx.doi.org/10.1063/1.3526258.

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Majidi, Azar P., and Tsu-Wei Chou. "Elevated Temperature Studies of Continuous and Discontinuous Fiber Reinforced Ceramic Matrix Composites." In ASME 1989 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1989. http://dx.doi.org/10.1115/89-gt-124.

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This paper reviews the analytical and experimental investigations at the Center for Composite Materials of the University of Delaware on ceramic matrix composites with continuous and discontinuous reinforcements. The focus is on the strength, fracture and creep behaviors of these composites. The experimental studies have been conducted on hot-pressed SiC whisker reinforced alumina and Nicalon SiC fiber reinforced calcium aluminosilicate (CAS) composites.
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LESUEUR, MAXIME, R. BYRON PIPES, and LAURENT ADAM. "Compression Molding of Discontinuous Fiber Composites, a Thermodynamics Approach to the Compaction Problem." In American Society for Composites 2017. Lancaster, PA: DEStech Publications, Inc., 2017. http://dx.doi.org/10.12783/asc2017/15219.

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BARTKOWIAK, MIRIAM, HANNES WEIT, JOHN MONTESANO, and KAY ANDRÉ WEIDENMANN. "Characterization of Discontinuous Fiber Reinforced Sheet Molding Compounds Under Tension-Tension Fatigue Load." In American Society for Composites 2019. Lancaster, PA: DEStech Publications, Inc., 2019. http://dx.doi.org/10.12783/asc34/31319.

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IQBAL, SAKIB, XINRAN XIAO, BEICHEN LI, and KESTUTIS SONTA. "Considering the Randomness of Mechanical Properties in Simulations of Discontinuous Fiber Reinforced Composites." In American Society for Composites 2020. Lancaster, PA: DEStech Publications, Inc., 2020. http://dx.doi.org/10.12783/asc35/34882.

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WERKEN, NEKODA VAN DE, RONALD ALLRED, and MEHRAN TEHRANI. "Effect of Alignment and Sizing on Mechanical Properties of Discontinuous Recycled Carbon Fiber Composites." In American Society for Composites 2017. Lancaster, PA: DEStech Publications, Inc., 2017. http://dx.doi.org/10.12783/asc2017/15366.

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