Journal articles: '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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10

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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11

Howe, J. Y., G. G. Tibbetts, C. Kwag, and M. L. Lake. "Heat treating carbon nanofibers for optimal composite performance." Journal of Materials Research 21, no. 10 (October 2006): 2646–52. http://dx.doi.org/10.1557/jmr.2006.0325.

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Partial graphitization of carbon nanofibers by high-temperature heat treatment can give improved composite properties. The intrinsic electrical conductivity of the bulk carbon nanofibers measured under compression is maximized by giving the fibers an initial heat treatment at 1500 °C. Similarly, for carbon nanofiber/polypropylene composites containing up to 12 vol% fiber, initial fiber heat treatments near 1500 °C give tensile modulus and strength superior even to composites made from fibers graphitized at 2900 °C. However, optimum composite conductivity is obtained with a somewhat lower heat-treatment temperature, near 1300 °C. Transmission electron microscopy (TEM) along with x-ray diffraction (XRD) explains these results, showing that heat treating the fibers alters the exterior planes from continuous, coaxial, and poorly crystallized to discontinuous nested conical crystallites inclined at about 25° to the fiber axis.

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12

Ismail, Nur Farhani, Nabilah Afiqah Mohd Radzuan, Abu Bakar Sulong, Norhamidi Muhamad, and Che Hassan Che Haron. "The Effect of Alkali Treatment on Physical, Mechanical and Thermal Properties of Kenaf Fiber and Polymer Epoxy Composites." Polymers 13, no. 12 (June 19, 2021): 2005. http://dx.doi.org/10.3390/polym13122005.

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The use of kenaf fiber as a reinforcement material for polymer composites is gaining popularity, especially in the production of automotive components. The main objective of this current work is to relate the effect of alkali treatment on the single fiber itself and the composite material simultaneously. The effect of temperature condition during mechanical testing is also investigated. Composite materials with discontinuous natural kenaf fibers and epoxy resin were fabricated using a compression moulding process. The epoxy composites were reinforced with 50 wt% untreated and treated kenaf fibers. The kenaf fiber was treated with NaOH solution (6% by weight) for 24 h at room temperature. Kenaf fiber treated with NaOH treatment had a clean surface and no impurities. For the first time we can see that alkali treatment had a damaging effect on the mechanical properties of kenaf fibers itself and the treated kenaf/epoxy composites. The composite reinforced with untreated kenaf fiber and treated kenaf fiber showed increased tensile strength (72.85% and 12.97%, respectively) compared to the neat epoxy. Reinforcement of the composite with treated kenaf fiber decreased the tensile strength due to the fiber pull out and the formation of voids which weakens the adhesion between the fibers and matrix. The temperature conditions also play an important role in composites with a significant impact on the deterioration of composite materials. Treated kenaf fiber has thermal stability and is not sensitive to temperature and as a result reinforcement with treated kenaf gives a lower loss value of 76%.

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13

Žmindák, Milan, Martin Dudinsky, and Zoran Pelagić. "Micro-Mechanical Analysis of Composites Reinforced with Discontinuous Fibers with Large Aspect Ratio." Applied Mechanics and Materials 420 (September 2013): 269–75. http://dx.doi.org/10.4028/www.scientific.net/amm.420.269.

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Properties of fiber composites reinforced with fibers greatly depend on the choice of fiber and matrix. Their mechanical properties and geometry influence the stress state in composite. In this paper the Method of Continuous Source Functions (MCSF) employing Trefftz Radial Basis Functions (TRBF) is presented. This method does not require any mesh. The focus will be given to the application of TRBF in form of dipoles to the simulation of composites reinforced with fibers of finite length with large aspect ratio. In presented example as well as in other linear problems, only nodes on the domain boundaries and a set of source functions in points outside the solution domain are necessary to satisfy the boundary conditions. Finally employing of MCSF for analysis of patch of glass fibers embedded in epoxy matrix subjected to far field stress is shown.

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14

Kuhn, Christoph, and Tim A. Osswald. "Editorial for the Special Issue on Discontinuous Fiber Composites, Volume II." Journal of Composites Science 5, no. 3 (March 5, 2021): 71. http://dx.doi.org/10.3390/jcs5030071.

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This Special Issue on discontinuous fiber composites and its published papers, like its predecessor, give the polymer engineer and scientist an insight into challenges and research topics in the field of discontinuous fiber-reinforced composites [...]

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15

Mousa, Saeed, Abdullah S. Alomari, Sabrina Vantadori, Waleed H. Alhazmi, Amr A. Abd-Elhady, and Hossam El-Din M. Sallam. "Mechanical Behavior of Epoxy Reinforced by Hybrid Short Palm/Glass Fibers." Sustainability 14, no. 15 (August 1, 2022): 9425. http://dx.doi.org/10.3390/su14159425.

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Natural fibers (NFs) have recently been the center of attention among researchers due to their low cost, availability, ease of manufacture, and potential environmental friendliness as reinforcing agents in composites. The present work deals with the mechanical behavior of palm fiber-reinforced epoxy-based composites with different weight percentage (Wt.%) ratios, ranging from 6% to 31.6%. Glass and hybrid fiber-reinforced epoxy-based composites were also examined. The indirect tensile test, i.e., diametral tensile test (DTT) and the small punch test (SPT), were used in the present work to determine the mechanical properties of the epoxy reinforced with discontinuous random oriented short fibers. Furthermore, short glass fibers were used to compare with palm fiber-reinforced epoxy. In addition, morphology observations of epoxy residue clinging to the natural fibers were carried out using the optical microscope and Scanning Electron Microscopy (SEM). The results showed that the natural fiber has a better adhesion bonding between the palm fiber/epoxy than that of glass fiber/epoxy. Therefore, adding palm fibers improves epoxy’s mechanical properties compared with synthetic glass fibers. The composite with high Wt.% of NF showed the highest diametral tensile strength (DTS), 21.74 MPa, over other composites. The DTS of composites with medium and low Wt.% of NF was lower than that of the high Wt.% by 14% and 30%, respectively.

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Kim, Hong Gun. "A Study on the Thermoelastic Analysis in Shear Deformable Discontinuous Composites." Key Engineering Materials 261-263 (April 2004): 645–50. http://dx.doi.org/10.4028/www.scientific.net/kem.261-263.645.

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A stress analysis has been performed to evaluate the thermally induced elastic stresses which can develop in a short fiber composite due to coefficient of thermal expansion (CTE) mismatch. An axisymmetric finite element model with the constraint between cells has implemented to find the magnitude of thermoelastic stresses in the fiber and the matrix as a function of volume fraction, CTE ratio, modulus ratio, and fiber aspect ratio. It was found that the matrix end regions fall under significant thermal stresses that have the same sign as that of the fibers themselves. Furthermore, it was found that the stresses vary along the fiber and fiber end gap in the same manner as that obtained in a shear-lag model during non-thermal mechanical loading.

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Lee, Eun Soo, Daniel Buecher, Si Hoon Jang, Dae Young Lim, and Ki Young Kim. "The Characterization of Discontinuous Carbon Fiber Mat Reinforced Epoxy Composite Materials." Advanced Materials Research 1110 (June 2015): 77–81. http://dx.doi.org/10.4028/www.scientific.net/amr.1110.77.

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The carbon fiber mat preforms are prepared by an air laid method with different fiber lengths of 10mm, 30mm and 50mm to characterize the resultant discontinuous composites. The composites are manufactured by a vacuum assisted resin infusion (VaRI) molding technique with the use of epoxy resins to investigate the effects of carbon fiber length on their physical and mechanical properties. The void content and thickness of the composites decrease with the increase in the fiber length at the same VaRI processing conditions. The tensile, flexural, impact properties of the composites are improved by increasing the fiber length in the textile preforms. By comparing with those of carbon fiber fabric reinforced composites, the discontinuous composites demonstrate the excellent performance in strength and modulus in spite of lower fiber volume fraction.

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Park, Wan Shin, Young Il Jang, Hyun Do Yun, Il Seung Yang, and Bae Su Khil. "The Behavior of Pseudo Strain-Hardening Cementitious Composite (PSH2C) Using Synthetic Fibers under Uniaxial Tensile Loading." Key Engineering Materials 627 (September 2014): 449–52. http://dx.doi.org/10.4028/www.scientific.net/kem.627.449.

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The application of pseudo strain-hardening cement composites (PSH2C) to structural systems depends primarily on the tensile response of the materials, which is a direct function of fiber and matrix characteristics, the fiber content or volume fraction. In general, improved response of material is observed with an increase in the fiber volume fraction, as long as the fiber content does not impede mixing. This paper addresses the direct tensile response of pseudo strain hardening cement composites (PSH2C) reinforced with PET fibers, which belongs to a class of discontinuous short fiber reinforced cement based composites characterized by a strain hardening and multiple cracking responses under direct tensile loading. The variables are different types of fibers (PET, PET+PE, PET+PVA).

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Tsuji, Nobuyuki, George S. Springer, and István Hegedus. "The Drapability of Aligned Discontinuous Fiber Composites." Journal of Composite Materials 31, no. 5 (March 1997): 428–65. http://dx.doi.org/10.1177/002199839703100501.

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Mashimo, Satoshi, Kazuhiro Takeda, Yoshio Yamaguchi, and Takashi Konishi. "DISCONTINUOUS STRESS RELAXATION OF PET CORD-RUBBER COMPOSITES." Sen'i Gakkaishi 43, no. 1 (1987): 22–26. http://dx.doi.org/10.2115/fiber.43.22.

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Giusti, Ruggero, Filippo Zanini, and Giovanni Lucchetta. "Automatic glass fiber length measurement for discontinuous fiber-reinforced composites." Composites Part A: Applied Science and Manufacturing 112 (September 2018): 263–70. http://dx.doi.org/10.1016/j.compositesa.2018.06.016.

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Kurita, Hiroki, Shiori Suzuki, Shoichi Kikuchi, Noriharu Yodoshi, Sophie Gourdet, and Fumio Narita. "Strengthening Mechanism of Titanium Boride Whisker-Reinforced Ti-6Al-4V Alloy Matrix Composites with the TiB Orientation Perpendicular to the Loading Direction." Materials 12, no. 15 (July 28, 2019): 2401. http://dx.doi.org/10.3390/ma12152401.

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We fabricated fully dense titanium boride (TiB) whisker-reinforced Ti-6Al-4V alloy matrix (Ti6Al4V-TiB) composites, with a homogeneous dispersion, a TiB orientation perpendicular to the loading direction (; two-dimensional random direction) and an intimate Ti/TiB interface without an intermediate interfacial layer in the Ti-6Al-4V alloy matrix, by spark plasma sintering. Microstructural analysis allows us to present the tensile properties of the Ti6Al4V-TiB composites with the theories for discontinuous fiber-reinforced composites. The Ti6Al4V-TiB 10 vol.% composite yielded a Young’s modulus of 130 GPa, an ultimate tensile strength (UTS) of 1193 MPa and an elongation of 2.8%. The obtained experimental Young’s modulus and UTS of the Ti6Al4V-TiB composites were consistent with the theoretical values estimated by the Halpin-Tsai and Shear-lag models. The good agreement between our experimental results and these models indicates that the TiB whiskers behave as discontinuous fibers in the Ti-6Al-4V alloy matrix.

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Wang, Zhenjin, Kotaro Mori, Kenya Nakajima, and Fumio Narita. "Fabrication, Modeling and Characterization of Magnetostrictive Short Fiber Composites." Materials 13, no. 7 (March 25, 2020): 1494. http://dx.doi.org/10.3390/ma13071494.

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Magnetostrictive materials have a wide variety of applications due to their great capability as sensors and energy-harvesting devices. However, their brittleness inhibits their applications as magnetostrictive devices. Recently, we developed a continuous magnetostrictive Fe-Co-fiber-embedded epoxy matrix composite to increase the flexibility of the material. In this study, we fabricated random magnetostrictive Fe-Co short fiber/epoxy composite sheets. It was found that the discontinuous Fe-Co fiber composite sheet has the magnetostrictive properties along the orientation parallel to the length of the sheet. Finite element computations were also carried out using a coupled magneto-mechanical model, for the representative volume element (RVE) of unidirectional aligned magnetostrictive short fiber composites. A simple model of two-dimensional, randomly oriented, magnetostrictive short fiber composites was then proposed and the effective piezomagnetic coefficient was determined. It was shown that the present model is very accurate yet relatively simple to predict the piezomagnetic coefficient of magnetostrictive short fiber composites. This magnetostrictive composite sheet is expected to be used as a flexible smart material.

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Peng, Li Ming, Bin Hu, and Wen Jiang Ding. "Mechanical Properties, Aging Behavior and Microstructure Evolution of Mg-Nd-Zn-Zr Based Magnesium Matrix Composite Reinforced with Alumina Fibers." Materials Science Forum 706-709 (January 2012): 687–92. http://dx.doi.org/10.4028/www.scientific.net/msf.706-709.687.

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Metal matrix composites reinforced with discontinuous reinforcement (short fiber, whisker or particle) are attractive for applications requiring higher stiffness and strength than traditional alloys. Unlike continuously reinforced composites, where the properties are mainly influenced by fibers, the properties of the discontinuously reinforced composites seem to be influenced more by matrix properties. Most of the discontinuously reinforced composites are based on age-hardenable light alloys, so that aging treatments can be applied to develop the optimum properties of the composites. The aging behavior of discontinuously reinforced composites has been a subject of great interest both from scientific and technological view points. Recently developed NZ30K (Mg-3wt.%Nd-0.5wt.%Zn-0.5wt.%Zr) alloys exhibit higher specific strength at both room and elevated temperatures, better strength and creep resistance than the existing commercial magnesium alloys. Accordingly, this alloy can be considered as a candidate material for potential automobile applications, such as engine blocks and pistons, which experience high service temperature. Its use could save considerable mass weight in powertrain systems. However, low elastic modulus and wear resistance of magnesium alloys limit their widespread applications. Metal matrix composites have been proposed as the feasible and economical solution. The aim of this study is to investigate the effect of alumina fibers on the aging hardening kinetics and age-hardening efficiency of squeeze cast NZ30K/Saffil/15p magnesium matrix composite. The aging behavior has been examined using Vickers, combined with microstructure observation developed during heat treatment by optical microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM).

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Shumuye, Eskinder Desta, Jie Liu, Weiwen Li, and Zike Wang. "Eco-Friendly, High-Ductility Slag/Fly-Ash-Based Engineered Cementitious Composite (ECC) Reinforced with PE Fibers." Polymers 14, no. 9 (April 26, 2022): 1760. http://dx.doi.org/10.3390/polym14091760.

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Engineered cementitious composites (ECCs) are a special class of ultra-ductile fiber-reinforced cementitious composites containing a significant amount of short discontinuous fibers. The distinctive tensile strain-hardening behavior of ECCs is the result of a systematic design based on the micromechanics of the fiber, matrix, and fiber–matrix interface. However, ECCs require extensive cement content, which is inconsistent with the goal of sustainable and green building materials. Consequently, the objective of this study is to investigate the mechanical performance of slag/fly-ash-based engineered cementitious composites (ECCs) reinforced with polyethylene (PE) fiber under axial compressive loading, as well as direct tensile and flexural strength tests. The composites’ microstructure and mineralogical composition were analyzed using images obtained from scanning electron microscopy (SEM), X-ray energy diffraction spectroscopy (EDS), X-ray powder diffraction (XRD), and X-ray fluorescence (XRF). The experimental results reveal that a slag-containing composite mixture shows strain-hardening behavior and comparable ductility properties to those of fly-ash-based composite mixtures. A ternary system of binder materials with 5% and 15% slag can increase the compressive strength of ECC by 3.5% and 34.9%, respectively, compared to slag-free ECC composite. Moreover, the microstructural results show that the slag-based cementitious matrix has a more closely cross-linked and dense microstructure at the matrix–aggregate interface. In addition, the concentration of particles on the surface of the fibers was higher in the slag-based cementitious composites than in the fly ash-based composite. This supports the concept that there is a stronger bonding between the fibers and matrix in the slag-based cementitious matrix than in fly-ash-based matrix.

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Gun, Halit, and Gorkem Kose. "Prediction of longitudinal modulus of aligned discontinuous fiber-reinforced composites using boundary element method." Science and Engineering of Composite Materials 21, no. 2 (March 1, 2014): 219–21. http://dx.doi.org/10.1515/secm-2013-0055.

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AbstractIn this study, the boundary element method is presented for the prediction of longitudinal modulus of aligned discontinuous fiber-reinforced composites. The details of the boundary element formulation model covering infinite friction (stick) contact conditions are given. Both fiber and matrix materials are assumed to display linear elastic material behavior. The formulation is applied to boron/epoxy discontinuous fiber-reinforced composites. The computed results show a very good agreement with the modified Cox model and the finite element analysis with experimental data.

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Jiang, Chichi, Enlin Han, Xiaodong Wang, and Dezhen Wu. "Effect of discontinuous long polyimide fiber on mechanical properties, fracture morphology, and crystallization behaviors of polyamide-6 matrix composites." Journal of Thermoplastic Composite Materials 31, no. 2 (March 24, 2017): 223–45. http://dx.doi.org/10.1177/0892705717697776.

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This work has conducted an extensive investigation on the effect of discontinuous long polyimide (PI) fiber on the mechanical properties, fracture morphology, and crystallization behaviors of polyamide-6 (PA6) matrix composites. A series of PA6 matrix composites with different contents of PI fiber were prepared through a standard melt-pultrusion process. The resulting composite specimens not only achieved a prominent reinforcement but also obtain a significant improvement in impact toughness. It is highlighted that the composites achieved a remarkable increase in Izod impact strength by a factor of five compared to pure PA6 when 12 wt% of PI fiber was incorporated. Moreover, the tensile strength of the composites reached 143 MPa at a fiber content of 18 wt%. The mechanical properties could be well predicted by the Cox-Krenchel model, but a negative deviation in experimental data was observed at high fiber concentrations due to the decrease of residual fiber length and fiber aggregation. The morphologic observation of fracture surface indicated that fiber pullout was a major mechanism for tensile failure as a result of long PI fiber-reinforcing effectiveness, and it was also the predominant energy absorption mechanism for the impact fracture of composite specimens. The presence of long PI fiber not only enhanced the crystallinity of PA6 matrix but also induced a well-defined transcrystalline layer on the fiber surface due to its high nucleating ability.

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Boen, Teddy, Hiroshi Imai, Lenny, and E. Suryanto Sarah. "Masonry buildings strengthened with textile-fiber composite (TRC) layers and fiber-reinforced cementitious (FRC) layers." E3S Web of Conferences 331 (2021): 05002. http://dx.doi.org/10.1051/e3sconf/202133105002.

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In June 2015, the authors published a paper titled “Brief Report of Shaking Table Test on Masonry Building Strengthened with Ferrocement Layers” [1]. The authors suggested in that paper to replace the traditional way of constructing masonry houses using the so called practical columns and beams (herein after called traditional masonry houses) with bandaging using ferrocement layers on both sides of the walls as skin facings and brick wall as core. Since then, many masonry houses bandaged with ferrocement layers are built in Indonesia. Apart from constructing new earthquake resistant houses, ferrocement bandaging is also used for retrofitting existing as well as damaged houses after earthquakes. In the past decades, continuous fiber mesh was introduced to replace the steel wire mesh in a cementitious matrix. Since the early 2000, textile-based composites were used in the field of strengthening and seismic retrofitting of masonry as well as concrete structures. Originally these new “textile fiber composite” materials are called “Textile Reinforced Concrete” (TRC) in Europe. However, in the USA, the term used is “Fiber Reinforced Cementitious Matrix systems” (FRCM). Extensive research on FRCM / TRC were conducted. A wide variety of publications on the subject matter are now available worldwide. Apart from TRC, many technical studies are published addressing fiber reinforced cement and concrete composite. The term “Fiber Reinforced Cementitious” (FRC) is used and defined as concrete and/or cementitious matrix with suitable discontinuous fibers added to it for the purposes of achieving a desired level of performance in a particular property, such as modulus elasticity, tensile strength, and ductility [2]. Lately, the use of discontinuous fibers as reinforcement for concrete and cementitious matrix FRC are introduced by many practitioners and civil engineers. Adding fibers in concrete / cementitious matrix mixer simply like adding sand or admixtures, to create a homogenous, isotropic, strong, tough, durable, and moldable structural materials [2]. In this paper the authors used the terms of TRC and FRC as defined by Naaman [2, 3], namely TRC for fiber-cement with fiber-mesh and FRC for fiber-cement with discontinuous fiber. This paper provides a simplified global analysis of the overall structure strengthened with FRCM / TRC as well as strengthened with FRC.

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Suryanarayan, S., and T. S. Creasy. "Analysis of interface granularity in discontinuous fiber composites." Journal of Adhesion Science and Technology 19, no. 13-14 (January 2005): 1175–88. http://dx.doi.org/10.1163/156856105774429118.

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Crosby, J. M., and T. R. Drye. "Fracture Studies of Discontinuous Fiber Reinforced Thermoplastic Composites." Journal of Reinforced Plastics and Composites 6, no. 2 (April 1987): 162–77. http://dx.doi.org/10.1177/073168448700600205.

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Bale, Jefri, Emmanuel Valot, Martine Monin, Olivier Polit, Claude Bathias, and Tresna Soemardi. "Tomography Observation of Fiber Reinforced Composites after Fatigue Testing." Applied Mechanics and Materials 799-800 (October 2015): 937–41. http://dx.doi.org/10.4028/www.scientific.net/amm.799-800.937.

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This work presented an experimental study to observe the inside conditions and damage appearances of fiber reinforced composites material by non destructive testing (NDT) method. In order to achieve this, an open hole specimen of unidirectional glass fiber composite (GFRP) and discontinuous carbon fiber composite (DCFC) had been using as the specimen test under tensile fatigue loading and observed using post failure monitoring techniques of NDT namely computed tomography (CT) scan. The results shown that the tomography observation based on segmentation method of gray value gives a good detection on early damage appearances before final failure of GFRP and DCFC after tensile fatigue loading conditions.

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Ismail, Khairul Izwan, Tze Chuen Yap, and Rehan Ahmed. "3D-Printed Fiber-Reinforced Polymer Composites by Fused Deposition Modelling (FDM): Fiber Length and Fiber Implementation Techniques." Polymers 14, no. 21 (November 1, 2022): 4659. http://dx.doi.org/10.3390/polym14214659.

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Fused Deposition Modelling (FDM) is an actively growing additive manufacturing (AM) technology due to its ability to produce complex shapes in a short time. AM, also known as 3-dimensional printing (3DP), creates the desired shape by adding material, preferably by layering contoured layers on top of each other. The need for low cost, design flexibility and automated manufacturing processes in industry has triggered the development of FDM. However, the mechanical properties of FDM printed parts are still weaker compared to conventionally manufactured products. Numerous studies and research have already been carried out to improve the mechanical properties of FDM printed parts. Reinforce polymer matrix with fiber is one of the possible solutions. Furthermore, reinforcement can enhance the thermal and electrical properties of FDM printed parts. Various types of fibers and manufacturing methods can be adopted to reinforce the polymer matrix for different desired outcomes. This review emphasizes the fiber types and fiber insertion techniques of FDM 3D printed fiber reinforcement polymer composites. A brief overview of fused deposition modelling, polymer sintering and voids formation during FDM printing is provided, followed by the basis of fiber reinforced polymer composites, type of fibers (synthetic fibers vs. natural fibers, continuous vs. discontinuous fiber) and the composites’ performance. In addition, three different manufacturing methods of fiber reinforced thermoplastics based on the timing and location of embedding the fibers, namely ‘embedding before the printing process (M1)’, ‘embedding in the nozzle (M2)’, and ‘embedding on the component (M3)’, are also briefly reviewed. The performance of the composites produced by three different methods were then discussed.

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Schuster, J., and K. Friedrich. "Characterization of Deformation States after Thermoforming of Long Discontinuous Fiber Composites (LDF™) by Using Ultrasonics." Advanced Composites Letters 2, no. 1 (January 1993): 096369359300200. http://dx.doi.org/10.1177/096369359300200104.

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Long Discontinuous Fiber - Composites (LDF™) were developed for thermoforming. This material with 5 cm long aligned fibers in a PEKK matrix has similar static mechanical properties as continuous fiber systems. A method is described to determine the elongation created by thermoforming without post-compression based on ultrasonic evaluation. During the experiments, a correlation between the plastic deformation of the material and the generated voids in the material was found.

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Osswald, Tim. "Editorial for the Special Issue on Discontinuous Fiber Composites." Journal of Composites Science 2, no. 4 (October 23, 2018): 63. http://dx.doi.org/10.3390/jcs2040063.

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The papers published in this special edition of the Journal of Composites Science will give the polymer engineer and scientist insight into what the existing challenges are in the discontinuous fiber composites field, and how these challenges are being addressed by the research community. [...]

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Kim, H. G., I. R. Grosse, and S. V. Nair. "Finite Element Mesh Refinement for Discontinuous Fiber Reinforced Composites." Journal of Engineering Materials and Technology 116, no. 4 (October 1, 1994): 524–32. http://dx.doi.org/10.1115/1.2904323.

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This paper is concerned with the development of a generalized approach for mesh refinement in a short fiber reinforced composite. Mesh refinement procedures are based on the calculation of the error in energy norm for global convergence and the traction differential approach at the fiber/matrix interface for local convergence. The mesh refinement strategy is based on the use of elongated elements at the fiber/matrix interface, yielding significantly different mesh patterns than obtained by conventional mesh refinement approaches. This difference may have a critical bearing on the subsequent thermo-mechanical properties predicted by finite element analysis (FEA). It is found that the use of elongated (i.e., high aspect ratio) elements for mesh refinement results in a much more rapid computational convergence rate than obtained by conventional meshes. Converged local solutions are obtained with significantly less degrees-of-freedom (DOF) than by conventional mesh refinement methods.

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Widiarta, I. Wayan, I. Nyoman Pasek Nugraha, and Kadek Rihendra Dantes. "PENGARUH ORIENTASI SERAT TERHADAP SIFAT MEKANIK KOMPOSIT BERPENGUAT SERAT ALAM BATANG KULIT WARU(HIBISCUS TILIACEUST) DENGAN MATRIK POLIYESTER." Jurnal Pendidikan Teknik Mesin Undiksha 6, no. 1 (March 26, 2018): 41. http://dx.doi.org/10.23887/jjtm.v6i1.11411.

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Penelitian ini bertujuan untuk mengetahui pengaruh orientasi serat terhadap kekuatan impak dan model patahan komposit polyester berpenguat serat batang kulit waru. Penelitian ini merupakan penelitian metode eksperimen dengan variabel terikat kekuatan impak, dan variabel bebas yaitu orientasi serat continuous, discontinuous, dan hyibrid. Berdasarkan perhitungan yang telah dilakukan, didapat F hitung sebesar 69,43. Selanjutnya hasil perhitungan tersebut dibandingkan dengan F tabel, dengan dbpembanding (antar) = 2 dan dbpenyebut (dalam) =27. Berdasarkan F tabel, didapat F tabel pada taraf signifikansi 5% sebesar 3,35. Perbandingan F hitung dengan F tabel ini menunjukkan bahwa F hitung lebih besar dari pada F tabel sehingga hasil penelitian ini signifikan. Berdasarkan uji signifikansi diatas, dapat disimpulkan bahwa H0 ditolak, dan H1 yang menyatakan bahwa terdapat perbedaan yang signifikan dari variasi orientasi serat continuous, discontinuous, dan hyibrid terhadap sifat mekanik komposit berpenguat serat alam batang kulit waru terhadap uji impak diterima. Berdasarkan dari uji lanjut yang sudah didapat, bahwa terdapat perbedaan kekuatan impak komposit polyester berpenguat serat alam batang kulit waru antara orientasi serat continuous dengan discontinuous dengan nilai 11,16, orientasi serat continuous dengan hyibrid dengan nilai 4,12, dan orientasi serat discontinuous dengan hyibrid dengan nilai 7,49. Pada orientasi serat continuous, discontinuous, dan hyibrid rata-rata mengalami patahan getas (briettle) dan mekanisme fiber pull out dan dikategorikan memiliki model patan sikat (brush fracture) pada orientasi serat hyibrid. Kata Kunci : Kata kunci :kekuatan impak, model patahan, pengaruh orientasi serat. This study aimed at analyzing the effect of fiber orientation toward impact strength and fracture of polyester composites reinforce fiber rods of waru bark. It was an experimental study by using dependent variable of impact strength, and independent variable that is fiber orientation continuous, discontinuous, and hybrid. The findings showed that F was 69, 43. Then, the result was compared by table F, with comparison was 2 and denominator was 27. Based on table F, significant level is 5% about 3,35. The comparison of count F and table F shown that count F is bigger than table F. it can conclude that this is significant. Based on significant test above, H0 was rejected, and H1 state that there is difference of variation of fiber orientation continuous, discontinuous, and hybrid toward character of mechanical composite reinforce natural fiber of waru bark to accepted impact test. Based on further testing, there is difference impact strength of composite polyester reinforce natural fiber of waru bark between fiber orientation continuous to discontinuous with the result 11,61, fiber orientation continuous to hybrid with the result 4,12, and fiber orientation discontinuous to hybrid with the result 7,49. In addition, fiber orientation continuous, discontinuous, and hybrid experience brittle and fiber pull out and it categorized brush fracture in fiber orientation of hybrid.keyword : Key words: effect of fiber orientation, fracture model, impact strength.

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Do, Thanh Trung, and Dong Joo Lee. "Failure of Composites with Discontinuous Fabric Preform under Bending." Key Engineering Materials 462-463 (January 2011): 698–703. http://dx.doi.org/10.4028/www.scientific.net/kem.462-463.698.

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During the fabric preform and/or mold closure processes of the resin transfer molded composites (RTMCs), the discontinuous fabric patterns such as wrinkling and overlapping can be occurred and influenced the failure strength. It is found that the composites with discontinuous fabric preform had two failure mechanisms as functions of fabric ply number and discontinuous fabric length under the three-point bending. First, the failure modes can be related to the bend strengths that were controlled by the interfacial bonding strength depending on the discontinuous fabric length. Second, the failures were controlled by the potential strength of fabric when the discontinuous length reached the critical value. Moreover, the experimentally measured results of the normal and discontinuous preform models under bending were compared to examine the safety conditions as functions of fiber content and other factors.

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Vaidya, Uday, Mark Robinson, Nitilaksha Hiremath, Pritesh Yeole, Merlin Theodore, Ahmed Hassen, and John Unser. "Multi-process tooling for discontinuous carbon and hybrid glass fiber thermoplastics." Advances in Mechanical Engineering 14, no. 7 (July 2022): 168781322211139. http://dx.doi.org/10.1177/16878132221113941.

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Expensive tooling often constraints the use of composites in the design and development of automotive parts. While there is significant confidence and knowledge in sheet and bulk metals, composite processes are less understood in mass production environment. The processes used to produce composites and resulting properties are influenced by fiber length attrition, resin to fiber ratio, process waste etc. Tool designs are determined very early in the engineering process. It is cost prohibitive to build additional tools, in the event it becomes obvious a better processing method and material would be beneficial, the original decision is not easily changed. In the present work we recognize the bottleneck of tooling costs and provide an approach of multi-process tooling. The innovation of this work is the design and demonstration of a single tool for different processes namely injection, injection-compression and extrusion-compression. The materials used in this study were long and short fiber thermoplastics (LFTs and SFTs). The resulting structure-property relationships have been reported for the materials and processing methods with a battery tray (BT) tool.

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Ryatt, Jeremy, and Mamidala Ramulu. "Numerical Comparison of the Elastic Response of Stochastic Tow-Based Composites with Different Chip Consolidation Methods." Key Engineering Materials 920 (May 16, 2022): 179–89. http://dx.doi.org/10.4028/p-w08maq.

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Stochastic tow based discontinuous composites (STBDC) are fabricated from the compression molding of chips made from chopped and slit pre-impregnated uni-directional carbon fiber reinforced polymer (CFRP) tape. The discontinuous mesostructure gives the material system increased moldability versus continuous fiber composites allowing complex three-dimensional parts to be manufactured. However, the discontinuous mesostructure creates challenges for engineers designing parts as the effective properties are variable. Furthermore, the properties have been shown to be a function of the consolidation method of the chips. This study uses finite element analysis simulations of mesostructural representative volume elements to compare the elastic response and characteristics. The results are compared to the available literature regarding the elastic response STBDCs.

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Wang, Zhaogui, Zhenyu Fang, Zhongqi Xie, and Douglas E. Smith. "A Review on Microstructural Formations of Discontinuous Fiber-Reinforced Polymer Composites Prepared via Material Extrusion Additive Manufacturing: Fiber Orientation, Fiber Attrition, and Micro-Voids Distribution." Polymers 14, no. 22 (November 15, 2022): 4941. http://dx.doi.org/10.3390/polym14224941.

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A discontinuous fiber-reinforced polymer composite (DFRPC) provides superior mechanical performances in material extrusion additive manufacturing (MEAM) parts, and thus promotes their implementations in engineering applications. However, the process-induced structural defects of DFRPCs increase the probability of pre-mature failures as the manufactured parts experience complicated external loads. In light of this, the meso-structures of the MEAM parts have been discussed previously, while systematic analyses reviewing the studies of the micro-structural formations of the composites are limited. This paper summarizes the current state-of-the-art in exploring the correlations between the MEAM processes and the associated micro-structures of the produced composites. Experimental studies and numerical analyses including fiber orientation, fiber attrition, and micro-voids are collected and discussed. Based on the review and parametric study results, it is considered that the theories and numerical characterizations on fiber length attrition and micro-porosities within the MEAM-produced composites are in high demand, which is a potential topic for further explorations.

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Martin, Joshua J., Michael S. Riederer, Melissa D. Krebs, and Randall M. Erb. "Understanding and overcoming shear alignment of fibers during extrusion." Soft Matter 11, no. 2 (2015): 400–405. http://dx.doi.org/10.1039/c4sm02108h.

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Fiber alignment is the defining architectural characteristic of discontinuous fiber composites and is dictated by shear-dominated processing techniques. Here we study how magnetic alignment can be used to overcome shear, maintain fiber alignment, and arrest Jeffrey orbits.

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Zak, G., M. N. Sela, V. Yevko, C. B. Park, and B. Benhabib. "Layered-Manufacturing of Fiber-Reinforced Composites." Journal of Manufacturing Science and Engineering 121, no. 3 (August 1, 1999): 448–56. http://dx.doi.org/10.1115/1.2832702.

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In this paper, we present a rapid manufacturing process for the layered fabrication of polymer-based composite parts using short discontinuous fibers as reinforcements. This process uses a UV-laser-based system for the selective solidification of the composite liquid. The primary components of the prototype are: (1) fiber-resin mixing subsystem, (2) composite-liquid deposition subsystem, (3) liquid leveling subsystem, and (4) laser-light delivery subsystem. Axiomatic Design Theory was used to validate the design selected for the experimental embodiment of the process. Extensive microscopic examination of the layered composite parts verified that the prototype system can yield comparable layer quality, in terms of accuracy and uniformity, to that of pure-resin parts made by a photopolymer-based commercial system. Furthermore, mechanical testing of these composite specimens showed up to 60 percent improvement in modulus over the unreinforced layered specimens.

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Miyake, Takushi, and Satoshi Imaeda. "A dry aligning method of discontinuous carbon fibers and improvement of mechanical properties of discontinuous fiber composites." Advanced Manufacturing: Polymer & Composites Science 2, no. 3-4 (October 2016): 117–23. http://dx.doi.org/10.1080/20550340.2016.1265693.

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Kuhn, Christoph, Enrico Koerner, and Olaf Taeger. "A simulative overview on fiber predictions models for discontinuous long fiber composites." Polymer Composites 41, no. 1 (July 29, 2019): 73–81. http://dx.doi.org/10.1002/pc.25346.

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Young, Stephen, Dayakar Penumadu, Darren Foster, Hannah Maeser, Bharati Balijepalli, Jason Reese, Dave Bank, Jeff Dahl, and Patrick Blanchard. "Smart Adhesive Joint with High-Definition Fiber-Optic Sensing for Automotive Applications." Sensors 20, no. 3 (January 22, 2020): 614. http://dx.doi.org/10.3390/s20030614.

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Structural health monitoring of fiber-reinforced composite-based joints for automotive applications during their manufacturing and on-demand assessment for its durability in working environments is critically needed. High-definition fiber-optic sensing is an effective method to measure internal strain/stress development using minimally invasive continuous sensors. The sensing fiber diameters are in the same order of magnitude when compared to reinforcement (glass, basalt, or carbon fibers) used in polymer composites. They also offer a unique ability to monitor the evolution of residual stresses after repeated thermal exposure with varying temperatures for automotive components/joints during painting using an electrophoretic painting process. In this paper, a high-definition fiber-optic sensor utilizing Rayleigh scattering is embedded within an adhesive joint between a carbon fiber-reinforced thermoset composite panel and an aluminum panel to measure spatially resolved strain development, residual strain, and thermal expansion properties during the electrophoretic paint process-simulated conditions. The strain measured by the continuous fiber-optic sensor was compared with an alternate technique using thermal digital image correlation. The fiber-optic sensor was able to identify the spatial variation of residual strains for a discontinuous carbon fiber-reinforced composite with varying local fiber orientations and resin content.

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Lopez, D., S. Thuillier, and Y. Grohens. "Prediction of elastic anisotropic thermo-dependent properties of discontinuous fiber-reinforced composites." Journal of Composite Materials 54, no. 14 (November 20, 2019): 1913–23. http://dx.doi.org/10.1177/0021998319889397.

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This study focuses on the micromechanical prediction of temperature-dependent elastic properties of a composite made of a polypropylene matrix reinforced with discontinuous glass fibers. Firstly, an experimental investigation of the mechanical behavior is presented. Specimen are cut from injection-molded rectangular plates using a pattern based on fiber orientation. The microstructure is investigated by X-ray tomography at the specimen center and an average orientation tensor is calculated. Tensile tests are performed over a temperature range from ambient temperature to 85℃ and dispersion of mechanical properties is rather low; moreover, they are representative of the ones measured out of an industrial injected part. Then, the evolution of elastic properties with orientation and temperature is analyzed and compared with numerical predictions calculated with Mori–Tanaka homogenization scheme.

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Velmurugan, R., G. Srinivasulu, and S. Jayasankar. "Influence of fiber waviness on the effective properties of discontinuous fiber reinforced composites." Computational Materials Science 91 (August 2014): 339–49. http://dx.doi.org/10.1016/j.commatsci.2014.05.004.

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Zheng, Xuan, Jun Zhang, and Zhenbo Wang. "Effect of multiple matrix cracking on crack bridging of fiber reinforced engineered cementitious composite." Journal of Composite Materials 54, no. 26 (May 4, 2020): 3949–65. http://dx.doi.org/10.1177/0021998320923145.

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In the present paper, a modified micromechanics based model that describes the crack bridging stress in randomly oriented discontinuous fiber reinforced engineered cementitious composite is developed. In the model, effect of multiple matrix cracking on fiber embedded length, which in turn influencing fiber bridging in the composite, is taken into consideration. First, crack spacing of high strength-low shrinkage engineered cementitious composite was experimentally determined by photographing the specimen surface at some given loading points during uniaxial tensile test. The diagram of average cracking spacing and loading time of each composite is obtained based on above data. Then, fiber bridging model is modified by introducing a revised fiber embedment length as a function of crack spacing. The model is verified with uniaxial tensile test on both tensile strength and crack opening. Good agreement between model and test results is obtained. The modified model can be used in design and prediction of tensile properties of fiber reinforced cementitious composites with characteristics of multiple matrix cracking.

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Hu, Chao, and Qing-Hua Qin. "Advances in fused deposition modeling of discontinuous fiber/polymer composites." Current Opinion in Solid State and Materials Science 24, no. 5 (October 2020): 100867. http://dx.doi.org/10.1016/j.cossms.2020.100867.

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Kim, Hong Gun. "Assessment of Fiber Stress Based on Elastoplastic Analysis in Discontinuous Composite Materials." Key Engineering Materials 306-308 (March 2006): 829–34. http://dx.doi.org/10.4028/www.scientific.net/kem.306-308.829.

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An elastopalstic analysis of the micromechanical approach is performed to investigate the stress transfer mechanism in a short fiber reinforced composites. The model is based on the New Shear Lag Theory (NSLT) which was developed by considering the stress concentration effects that exist in the matrix region near fiber ends. The unit cell model is selected as the Representative Volume Element (RVE) for the investigation of longitudinal elastoplastic behavior in discontinuous composites. Thus far, it is focused on the detailed description to predict fiber stresses in case of the behavior of elastoplastic matrix as well as elastic matrix. Slip mechanisms between fiber and matrix which normally take place at the interface are considered for the accurate prediction of fiber stresses. Consequently, onset of Slip points is determined analytically and it showed a moving direction to the fiber center region from the fiber tip as the applied load increases. It is found that the proposed model gives the more reasonable prediction compared with the results of the conventional model (SLT).

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Journal articles on the topic 'Discontinuous fiber composites'

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