Articoli di riviste: "Composite wrapping"

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O RUAN, FANGTAO, CHENGLONG XIA, LI YANG, ZHENZHEN XU e FEIYAN TAO. "Effect of filaments diameter on the mechanical properties of wrap hybrid CFRP". Industria Textila 72, n. 02 (22 aprile 2021): 144–48. http://dx.doi.org/10.35530/it.072.02.1733.

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In this paper, the vine-like structure of carbon bundles was designed through polyester fibre wrapping for better mechanical properties. The effect of wrapped hybrid structure and diameters of polyester fibre on the mechanical properties of carbon-polyester fibre/epoxy unidirectional composites was investigated experimentally. Five kinds of specimens with different polyester filament diameters were produced. The impact, tensile and unidirectional compressive properties of WHC (Wrap Hybrid Composite) were measured. Experimental results show that: it can be developed with strength and toughness properties far superior to those of their constituents, the compressive fracture morphology of specimens indicated that the fracture patterns of composites depend on wrapped hybrid structure, polyester fibres with higher tensile strengths provide better impact resistance, while thinner wrapping fibres enhance the compression properties of the composite material more effectively. The diameter of the wrapping fibre should be optimized as per the application of the composite material. The vine-like structure can provide a new design method for the structural design of continue fibre reinforced composite materials.

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Shaktivell M.Letchumanan, Ahmad Mubarak Tajul Arifin, Nor Adrian Nor Salim e Ishkrizat Taib. "A Comparative Analysis on the Optimization of Carbon Fibre Reinforced Polymer and Glass Fiber Reinforced Polymers as Wrapping Structures on Defected Piping System using Computational Simulation Approach". Journal of Advanced Research in Applied Mechanics 118, n. 1 (2 giugno 2024): 79–89. http://dx.doi.org/10.37934/aram.118.1.7989.

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This study examined the application of carbon fiber reinforced polymer (CFRP) and glass fiber reinforced polymer (GFRP) as wrapping structures for defective pipe systems. The structural behavior and performance of the CFRP and GFRP wrapping structures were assessed using computational simulation methodologies. The goal of the study was to determine the best wrapping material for strengthening the integrity and reliability of piping systems with defects by comparing the results of the simulations. The study evaluated the capability of the proposed composite wrapping structure through CAD simulation. The simulations provided preliminary analysis and visually depicted deformations, aiding in the selection of an optimized lamination orientation for the composite wrapping structure in real-world applications. Eventually, this approach could have alleviated two primary failure modes that were common in composite repair: composite overloading due to excessive thickness and composite delamination from the substrate. The results of this study would have helped enhance effective and efficient pipe repair techniques in a variety of industries by offering useful insights into the selection and use of suitable wrapping structures for repairing defective pipes.

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Archana, D. P., H. N. Jagannatha Reddy, N. Jeevan, R. Prabhakara, M. U. Aswath e Basavaraju Paruti. "Natural Jute Fibre-Reinforced Polymer Composite System for Posttensioned Beam Strengthening in Flexure". Advances in Materials Science and Engineering 2021 (27 novembre 2021): 1–14. http://dx.doi.org/10.1155/2021/2905150.

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Existing structures require repair and strengthening owing to degradation caused by incorrect design and construction, environmental impacts, or structural upgradation to meet new seismic design standards or to correct execution problems that occurred during construction. These strengthening requirements can be satisfied by a variety of strengthening techniques. The creation of a fibre-reinforced polymer (FRP) composite system offers a new design method for the strengthening of existing structures. In this study, posttensioned beams are strengthened by using sustainable materials such as natural jute fibre-reinforced polymer (FRP) composites. The performance of these composite systems in the flexural strengthening of posttensioned beams was used to assess their effectiveness. Consequential result for longitudinal reinforcement throughout the length of the beam for flexural strengthening was evaluated. Flexural performance, crack width, ductility, and load-deflection relationship study of control beams (Scheme A) and retrofitted beams (Schemes B and C) under different wrappings were considered in the investigation. An experimental study depicts that using the full wrapping (FW) technique increases the flexural strength of PSC beams wrapped in JFRP by 23% and, by using the strip wrapping (SW) technique, the flexural strength is increased by 10%. The JFRP composite system of strengthening has shown the highest deformability index and showed that the JFRP material has enormous potential as a structural strengthening material.

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Tarnai, T., F. Kovács, P. W. Fowler e S. D. Guest. "Wrapping the cube and other polyhedra". Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 468, n. 2145 (18 aprile 2012): 2652–66. http://dx.doi.org/10.1098/rspa.2012.0116.

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An infinite series of twofold, two-way weavings of the cube, corresponding to ‘wrappings’, or double covers of the cube, is described with the aid of the two-parameter Goldberg–Coxeter construction. The strands of all such wrappings correspond to the central circuits (CCs) of octahedrites (four-regular polyhedral graphs with square and triangular faces), which for the cube necessarily have octahedral symmetry. Removing the symmetry constraint leads to wrappings of other eight-vertex convex polyhedra. Moreover, wrappings of convex polyhedra with fewer vertices can be generated by generalizing from octahedrites to i -hedrites, which additionally include digonal faces. When the strands of a wrapping correspond to the CCs of a four-regular graph that includes faces of size greater than 4, non-convex ‘crinkled’ wrappings are generated. The various generalizations have implications for activities as diverse as the construction of woven-closed baskets and the manufacture of advanced composite components of complex geometry.

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Ruan, Fangtao, Zhenzhen Xu, Dayin Hou, Yang Li e Changliu Chu. "Enhancing Longitudinal Compressive Properties of Unidirectional FRP Based on Microbuckling Compression Failure Mechanism". Journal of Engineered Fibers and Fabrics 13, n. 1 (marzo 2018): 155892501801300. http://dx.doi.org/10.1177/155892501801300110.

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In this study, a new methodology to improve the longitudinal compressive strength and modulus of ultra-high molecular weight polyethylene (UHMWPE) fiber-reinforced epoxy resin matrix is developed. The proposed method involves wrapping a UHMWPE fiber bundle with a poly-p-phenylene benzobisoxazole fiber filament using a winding method, and using these bundles to fabricate unidirectional UHMWPE fabric. UHMWPE/epoxy composites were fabricated using vacuum-assisted resin-transfer molding (VARTM), and the compression properties of the composite were evaluated and compared to investigate the effect of the filament wrapping. Improvements in the compressive modulus were achieved for filaments wound with applied tension, and when increasing the filament-winding spacing; however, the compressive strength decreased with an increase in the filament-winding spacing. Results obtained confirm that fiber microbuckling failure occurred in the composite under longitudinal compression, and that inhibiting the buckling length of the fiber improved compressive properties. These results may be useful when designing the mechanical properties of fiber-reinforced polymer composites.

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Kasimzade, A., e S. Tuhta. "Analytical, Numerical and Experimental Examination of Reinforced Composites Beams Covered with Carbon Fiber Reinforced Plastic". Journal of Theoretical and Applied Mechanics 42, n. 1 (1 marzo 2012): 55–70. http://dx.doi.org/10.2478/v10254-012-0004-1.

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Analytical, Numerical and Experimental Examination of Reinforced Composites Beams Covered with Carbon Fiber Reinforced PlasticIn the article, analytical, numerical (Finite Element Method) and experimental investigation results of beam that was strengthened with fiber reinforced plastic-FRP composite has been given as comparative, the effect of FRP wrapping number to the maximum load and moment capacity has been evaluated depending on this results. Carbon FRP qualitative dependences have been occurred between wrapping number and beam load and moment capacity for repair-strengthen the reinforced concrete beams with carbon fiber. Shown possibilities of application traditional known analysis programs, for the analysis of Carbon Fiber Reinforced Plastic (CFRP) strengthened structures.

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Pan, Shengshan, Muzhou Zhao, Bassem Andrawes, Hang Zhao e Lian Li. "Compressive behavior of cylindrical rubber buffer confined with fiber reinforced polymer". Journal of Low Frequency Noise, Vibration and Active Control 39, n. 3 (17 luglio 2018): 470–84. http://dx.doi.org/10.1177/1461348418783570.

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This paper presents a new composite buffer for mitigating the lateral displacement of structures under seismic loading. The buffer consists of a cylindrical rubber wrapped with fiber reinforced polymer composite. The uniaxial compressive stiffness of the buffer can be controlled by varying either the number of fiber reinforced polymer layers or the wrapping scheme of fiber reinforced polymer. First, a test program is carried out to investigate the impact of various parameters on the compressive stiffness and strength of the new buffer including thickness of fiber reinforced polymer, wrapping scheme, and method of wrapping of fiber reinforced polymer. Next, a theoretical formulation is derived to describe the constitutive behavior of fiber reinforced polymer wrapped rubber under uniaxial compression using strain energy density function of the Yeoh N-order polynomial model. Finally, a finite element model is developed to analyze the new composite buffer and the numerical results are validated using the experimental results. The results of the study show that the Yeoh model is able to simulate the behavior of rubber under compression. The new composite buffer exhibits significantly higher stiffness and strength than that of pure rubber. Wrapping scheme plays an important role in defining the mechanical behavior of the buffer. The study also shows good agreement between the numerical simulation and the experimental results.

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Lin, Jia Horng, Zhi Cai Yu, Jian Fei Zhang e Ching Wen Lou. "Manufacturing Techniques and Functional Properties of the Bamboo Charcoal/Antibacterial/Stainless Steel Metal Composite Woven Fabric". Advanced Materials Research 910 (marzo 2014): 238–41. http://dx.doi.org/10.4028/www.scientific.net/amr.910.238.

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In this research, the B/A/S composite yarns were fabricated using the stainless steel wires as core yarn, antibacterial nylon and bamboo charcoal polyester filaments as inner wrapped yarn and outer wrapped yarn, respectively. The composite yarns with a wrapping number of 8, 11, 14 turns/cm were fabricated on a hollow spindle spinning machine. Furthermore, the composite fabrics were woven with the B/A/S composite yarns as weft yarns and the PET as the warp yarns. These fabrics were evaluated in terms of far infrared (FIR) emissivity and the air permeability. The presence of the bamboo charcoal was found to increase the FIR emissivity. The highest of the FIR emissivity was obtained when the weft yarns with a wrapping number of 11 turns/cm. The lamination numbers of the woven fabrics varied from 1-5 layers. The far infrared emissivity and air permeability of the woven fabrics was 0.94 and 268 cm3/cm2/s when the lamination numbers was 2 layers and the wrapping number was 11 turns/cm.

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Bohse, Juergen, Georg W. Mair e Pavel Novak. "Acoustic Emission Testing of High-Pressure Composite Cylinders". Advanced Materials Research 13-14 (febbraio 2006): 267–72. http://dx.doi.org/10.4028/www.scientific.net/amr.13-14.267.

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AE studies were performed considering pressure cylinders of design1 Type II – metallic liner with hoop composite wrapping, Type III – metallic load sharing liner with full composite wrapping and Type IV – all-composite cylinder. The AE technique has to be improved so far that for different design types of cylinders standard AE equipment can be used in an easy and practicable way under normal conditions of production and service. The paper presents our 8 years of experience in this application area using conventional AE measuring technique. Potentials, requirements and limits for detection of manufacturing faults and in-service damages of highpressure composite cylinders are discussed. 1Cylinder types classification in accordance with ECE R 110 / ISO 11439

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Wang, Kaifeng, Mengjie Liu, Jie Cao, Jiayong Niu e Yunxia Zhuang. "Bearing Characteristics of Composite Foundation Reinforced by Geosynthetic-Encased Stone Column: Field Tests and Numerical Analyses". Sustainability 15, n. 7 (29 marzo 2023): 5965. http://dx.doi.org/10.3390/su15075965.

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In order to study the bearing characteristic of the geosynthetic-encased stone column (GESC) on the composite foundation, a series of field tests and numerical simulation were carried out on the composite foundations reinforced by the traditional stone column and the GESC. The pile–soil stress ratio, excess pore water pressure and lateral displacement of two kinds of composite foundations were monitored. The effects of geotextile stiffness, geotextile wrapping length and gravel internal friction angle on the composite foundation with the GESC were analyzed by establishing different numerical models. The results show that the GESC can bear larger loading compared with the traditional stone column. The pile–soil stress ratio of the composite foundation with the traditional stone column gradually increases from 1.1 to 1.5 with the increasing of the embankment height. However, the pile–soil stress ratio of the composite foundation with the GESC reaches 1.5 at the initial filling stage and increases to 1.7 with the filling construction. The drainage effect of the GESC is better than that of the traditional stone column, and the GESC can effectively improve the overall stiffness of stone column, so as to reduce the lateral displacement of soil mass. The increases of geotextile stiffness, geotextile wrapping length and gravel internal friction angle can improve the bearing performance of the composite foundation with the GESC. However, after geotextile stiffness and wrapping length reach a certain value, the influence of its lifting amount on the composite foundation will be reduced.

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Kim, Jong-Chan, Kyung-Jin Kim e Sung-Man Lee. "Preparation and Characterization of Core-Shell Structure Hard Carbon/Si-Carbon Composites with Multiple Shell Structures as Anode Materials for Lithium-Ion Batteries". Energies 14, n. 8 (9 aprile 2021): 2104. http://dx.doi.org/10.3390/en14082104.

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Novel core-shell structure hard carbon/Si-carbon composites are prepared, and their electrochemical performances as an anode material for lithium-ion batteries are reported. Three different types of shell coating are applied using Si-carbon, Si-carbon black-carbon and Si-carbon black-carbon/graphite nanosheets. It appears that the use of n-Si/carbon black/carbon composite particles in place of n-Si for the shell coating is of great importance to achieve enhanced electrochemical performances from the core-shell composite samples, and additional wrapping with graphite nanosheets leads to a more stable cycle performance of the core-shell composites.

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Gemi, Lokman, Emrah Madenci, Yasin Onuralp Özkılıç, Şakir Yazman e Alexander Safonov. "Effect of Fiber Wrapping on Bending Behavior of Reinforced Concrete Filled Pultruded GFRP Composite Hybrid Beams". Polymers 14, n. 18 (7 settembre 2022): 3740. http://dx.doi.org/10.3390/polym14183740.

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The application of pultruded fiber reinforced polymer (FRP) composites in civil engineering is increasing as a high-performance structural element or reinforcing material for rehabilitation purposes. The advantageous aspects of the pultrusion production technique and the weaknesses arising from the 0° fiber orientation in the drawing direction should be considered. In this direction, it is thought that the structural performance of the profiles produced by the pultrusion technique can be increased with 90° windings by using different fiber types. This paper presents experimental studies on the effect of FRP composite wrapping on the flexure performance of reinforced concrete (RC) filled pultruded glass-FRP (GFRP) profile hybrid beams with damage analysis. The hybrid beams are wrapped fully and partially with Glass fiber reinforced polymer (GFRP) and carbon fiber reinforced polymer (CFRP) composites. Hybrid beam specimens with 0° to 90° fiber orientations were tested under three- and four-point bending loads. Based on the experimental load–displacement relationship results, initial stiffness, ductility, and energy dissipation capacity were compared. The experimental findings revealed that the maximum load-carrying capacities of beams produced with pultrude profiles increased by 24% with glass wrapping and 64.4% with carbon wrapping due to the change in the damages. A detailed damage analysis is provided. Similarly, significant increases were observed in structural performance ratios such as initial stiffness and ductility ratio.

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Parker, Anthony P., Edward Troiano e John H. Underwood. "Stresses Within Compound Tubes Comprising a Steel Liner and an External Carbon-Fiber Wrapped Laminate". Journal of Pressure Vessel Technology 127, n. 1 (1 febbraio 2005): 26–30. http://dx.doi.org/10.1115/1.1845472.

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There is increasing interest in techniques that permit weight reduction of thick cylinders, particularly gun barrels. The method examined within this paper involves the external wrapping of a carbon fiber-based laminate jacket around a steel liner. Various design options are examined, e.g., prior autofrettage of a steel liner followed by external tension wrapping and benign wrapping of a stress-free steel liner followed by autofrettage of the assembly. Outcomes include optimum overstrain and machining of the steel liner, identification of a potential “crushing” failure mode due to radial compressive stresses and techniques for application of tension wrapping which optimize hoop stress within the composite jacket. Finally, possible combinations of fiber orientations are discussed.

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Krishnasamy, Jagatheesan, Alagirusamy Ramasamy, Apurba Das e Ananjan Basu. "Electromagnetic absorption behaviour of carbon helical/coiled yarn woven and knitted fabrics and their composites". Journal of Thermoplastic Composite Materials 32, n. 3 (21 febbraio 2018): 357–82. http://dx.doi.org/10.1177/0892705718759389.

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In this study, a novel carbon helical/coiled yarn was prepared for developing an electromagnetic (EM) absorbing structure in C-band region (4–8 GHz). The carbon helical yarn was fabricated in a direct twisting machine in which a stainless steel (SS) filament was used as the core and carbon yarn was used as the wrapping thread. The woven and plain knit structures were prepared using the carbon helical yarns. Subsequently, composites were prepared by film stacking method by sandwiching a helical yarn fabric between the polypropylene films. The shielding behaviour of fabrics and the composites was tested using the waveguide method. It was observed that 1/1 plain knit fabric having an optimum number of core SS filaments and helical yarn density of 50–150 turns/m showed a higher absorption coefficient of 0.91 than other fabrics. Hence, a particular proportion of helical carbon and SS content in a fabric maximizes its absorption coefficient. In the composite form, the absorption level was reduced and behaved like a metal. In addition, increase in fineness of core SS filaments also decreased the absorption behaviour of fabrics and composites. However, the overall shielding effectiveness of fabric and composite was increased for increasing the wrapping density. Compared to fabric form, composites showed larger reflective and total loss. In addition, three-point flexural strength and impact energy absorption of helical yarn composites were also investigated. The developed fabrics can be used as EM absorbing structures in domestic and military applications, whereas the composite can be used as shielding panels to the replacement of metal shield.

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Wang, Yan Yv, Zhi Qiang Cheng e Bao Sheng Liu. "Progressive Failure Analysis of Pipeline Repaired by Composite Wrapping". Applied Mechanics and Materials 853 (settembre 2016): 483–87. http://dx.doi.org/10.4028/www.scientific.net/amm.853.483.

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Composite overwrap systems have been widely used to repair damaged pipelines. Its effectiveness has been proven by many researches and engineering applications. However, the research on progressive failure mode of the repaired structure has not been reported. In the present paper, finite element method with Hashin failure criteria is developed to realize the progressive failure analysis. The predicted burst pressure is in good agreement with the burst experiment. Different from widely-reported failure progress in Composite Overwrapped Pressure Vessels (COPV), the progressive failure analysis for the defected pipeline overwrapped by composite reveals very different failure stages: stable failure propagation and rapid failure propagation. The identification of critical pressure between these two stages is valuable in composite reparation design for the defected pipeline.

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Zhang, Songtao, Nianwu Li, Hongling Lu, Jiafei Zheng, Rui Zang e Jieming Cao. "Improving lithium–sulfur battery performance via a carbon-coating layer derived from the hydrothermal carbonization of glucose". RSC Advances 5, n. 63 (2015): 50983–88. http://dx.doi.org/10.1039/c5ra08081a.

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R., Balamuralikrishnan, M. Al Madhani e R. Al Madhani. "Study on Retrofitting of RC Column Using Ferrocement Full and Strip Wrapping". Civil Engineering Journal 5, n. 11 (1 novembre 2019): 2472–85. http://dx.doi.org/10.28991/cej-2019-03091425.

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Ferrocement is one of the cement-based composites used for retrofitting and rehabilitation among many applications. Ferrocement is one of the reinforced concrete form with lightweight and thin composite with durability and environmental resistant that strengthen the conventional RC columns to increase its strength and serviceability. This paper examines the performance of the ferrocement wrapping in RC columns experimentally with numerical simulation using ANSYS19. Totally sixteen number of RC column of size 150 mm × 150 mm in cross section and 450 mm in length were cast and tested in laboratory. Twelve are retrofitted columns with respect to volume fraction and wrapping technique. Six columns were retrofitted by full wrapping technique and six columns of strip wrapping technique. The remaining four columns are control columns in virgin condition to compare with the retrofitted columns. Concerning the volume fraction of each specimen, the number of pre-woven mesh layers were single layer, double layer and three layers. C30 concrete grade adopted in all specimens as per ACI Committee 211-1.91 with 4H8 longitudinal reinforcement and H6 of 75mm c/c ties. As the previous researchers examined the ferrocement and proved its efficiency. This study aims to examine the ferrocement in full and strip wrapping technique to compare their efficiency to increase the strength. Finite element analysis using ANSYS19 adopted to compare the experimental data with the numerical simulation. The results are analyzed and observed that the ferrocement has increased the confinement and strength of the RC columns.

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Marsden, S. P., D. C. Swailes e G. R. Johnson. "Algorithms for exact multi-object muscle wrapping and application to the deltoid muscle wrapping around the humerus". Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 222, n. 7 (1 ottobre 2008): 1081–95. http://dx.doi.org/10.1243/09544119jeim378.

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Lines of action of muscle forces imply the function and performance of muscles acting around joints. It is not always possible to determine muscle force lines of action in vivo, and so computational techniques are often used to predict them. It is common to model a muscle as a taut elastic string that follows the shortest geodesic path between attachments over the wrapping geometry. A number of studies have been concerned with wrapping paths over single wrapping objects, and those that have considered more objects have applied the single-object solutions with iterative approaches to the search for a solution. This study presents a more efficient methodology for finding the exact solutions to a certain class of wrapping problems in which the path is constrained by multiple surfaces. It also introduces a more general wrapping technique based on the idea of energy minimization, which has been successfully validated against the exact solution. These methods are applied to the case of an element of the deltoid wrapping around the humerus modelled as a composite sphere—cylinder. Comparison of results with those obtained from approximated single-object solutions demonstrates the need to include correct multi-object wrapping algorithms in biomechanical models.

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Wang, Xiaopei, Deng’an Cai, Chao Li, Fangzhou Lu, Yu Wang e Guangming Zhou. "Failure analysis of three-dimensional braided composite tubes under torsional load: Experimental study". Journal of Reinforced Plastics and Composites 36, n. 12 (16 febbraio 2017): 878–88. http://dx.doi.org/10.1177/0731684417694255.

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An experimental study on the effects of braided processes on the torsional strength, torsional modulus and failure modes of the three-dimensional braided composite tubes are presented. Based on the movement of carries, the yarn traces of three-dimensional braided composite tubes are analyzed systematically. Four different three-dimensional braided composite tubes are formed by resin transfer molding, and a number of torsional tests are performed respectively using a special test device. It is found that the torsional strength of three-dimensional five-directional braided composite tubes is higher than others, while the torsional modulus of three-dimensional multi-layer wrapping braided composite tubes is the highest. Furthermore, the damage behaviors of 3D braided composite tubes are significantly influenced by braiding process. One focus is to evaluate the damage mechanism of three-dimensional braided composite tubes by cutting the specimens and using scanning electron microscopy. Under torsional load, three-dimensional five-directional braided composite tubes and three-dimensional surface-core five-directional braided composite tubes are fractured in compression and shear failure, while three-dimensional multi-layer wrapping braided composite tubes and three-dimensional seven-directional braided composite tubes are split open in tensile and shear failure.

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Lu, Jin Ping, Kang Hai Tan e David Zheng. "Strengthening of Column Stump Using Glass Fiber Composite Strengthening System". Advanced Materials Research 1129 (novembre 2015): 353–60. http://dx.doi.org/10.4028/www.scientific.net/amr.1129.353.

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The durability of concrete structures has long been a concern of many countries, especially in the island country of Singapore, where many structures are constructed along coastal areas. Currently, the durability of concrete under marine conditions can be enhanced by the addition of admixtures, and using high grade concrete. The FRP system has been proven to be one of the effective method to strengthen the concrete structure. The FRP system, which composed of the epoxy and glass fiber was evaluated according to various standard testing methods to get the basic technical information of the FRP system. Concrete columns of high aspect ratio with the size of 420mm x 115mm x 1500mm, 200mm x 200mm x 700mm and 200mm x 300mm x 700mm were wrapped with the FRP system with 3 horizontal wrapping and tested to verify the effectiveness of FPR wrapping. The theoretical calculation by computer model were also performed to estimate the strength gain for comparison with testing results. The results showed that the FRP wrapping for this type of columns can increase the ultimate strength by an average of 31.8%, with a minimum of 24.4% and a maximum of 37.5%.

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Shaktivell M. Letchumanan, Ahmad Mubarak Tajul Arifin, Ishkrizat Taib e Nor Adrian Nor Salim. "Computational Fluid Dynamic Analysis on Carbon Fibre Reinforced Polymer Wrapped on Defected Oil and Gas Piping System Using Solidwork Flow Simulation". Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 101, n. 2 (20 gennaio 2023): 197–210. http://dx.doi.org/10.37934/arfmts.101.2.197210.

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Utilising Carbon Fibre Reinforced Polymer (CFRP) as a wrapping structure on defected piping system is not a very new approach in maintaining the defected pipe structure. But simulating the entire approach using computational simulation technique makes this research to be unique. This composite material was regarded as a one-of-a-kind wrapping material since it might have the combined properties of the element or significantly different properties than the constituents individually. Computational Fluid Dynamic (CFD) analysis is needed to make sure that the proposed wrapping structure doesn’t disrupt the fluid flow after the repair is done. The research is keen to fully utilise Solidwork flow simulation in evaluating the capability of proposed CFRP wrapping structure without any leaks or opening. Based on simulated data, this technique provides a preliminary analysis and visual deformations in selecting the suitable optimised lamination orientation of CFRP in real-world applications. Furthermore, the flow simulation study in SolidWorks has identified areas where possible fluid accumulation could occur after the repair has been done. This approach may prevent two primary failure modes by achieving the right lamination orientation and thickness which is CFRP overloading due to excessive thickness and CFRP delamination of the composite laminate from the substrate.

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Mi, Yingying, Wen Liu, Qian Wang, Jianbing Jiang, Gary W. Brudvig, Henghui Zhou e Hailiang Wang. "A pomegranate-structured sulfur cathode material with triple confinement of lithium polysulfides for high-performance lithium–sulfur batteries". Journal of Materials Chemistry A 5, n. 23 (2017): 11788–93. http://dx.doi.org/10.1039/c7ta00035a.

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A pomegranate-structured sulfur cathode material, with a dendrimer/graphene-oxide composite wrapping sulfur-infiltrated ferrocene-functionalized mesoporous carbon, shows high electrochemical performance.

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Murugadoss, J. Raja, Byung Jae Lee, Jin Wook Bang, G. Ganesh Prabhu e Yun Yong Kim. "Performance Analysis of CFRP Composite Strips Confined RC Columns under Axial Compression". Advances in Materials Science and Engineering 2015 (2015): 1–18. http://dx.doi.org/10.1155/2015/170295.

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In an attempt to mitigate the high cost of FRP composite strengthening, an experimental investigation was carried out that sought to achieve efficient and most favorable FRP strengthening using CFRP composite strips. 50 mm wide CFRP composite strips were used in two different spacings (20 mm and 40 mm) to confine columns. The test results of the column confined with smaller spacing (20 mm) showed significant restraint of axial deformation of the column and enhanced the strength capacity to a maximum of 99.20% compared to that of reference column. In contrast, the column confined by strips with larger spacing (40 mm) failed by crushing of concrete alone, which occurred even before the CFRP strips reached their ultimate strain. In addition, the embodied energy that exists in the CFRP strips could not be utilized effectively. The stress and strength enhancement ratio of this present study was compared with the previous research that has been conducted on columns confined with full wrapping. From the obtained results, it is recommended that CFRP strips with a spacing of 20 mm be used to improve the strength capacity of the RC column; in addition, this wrapping technique provides economic benefits compared to a column confined with full wrapping.

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Qin, Wei, Baodong Fang, Songtao Lu, Zhida Wang, Yan Chen, Xiaohong Wu e Lu Han. "Improving the performance of Li–S batteries by reinforced PPy wrapping over acetylene black-coated sulfur". RSC Advances 5, n. 17 (2015): 13153–56. http://dx.doi.org/10.1039/c4ra15796f.

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Lin, Jia Horng, Ting An Lin, An Pang Chen e Ching Wen Lou. "Electromagnetic Shielding Effectiveness of Physical Property PET/Stainless Steel Composite Fabrics". Advanced Materials Research 910 (marzo 2014): 210–13. http://dx.doi.org/10.4028/www.scientific.net/amr.910.210.

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The electronic appliance is capable of emitting electromagnetic waves that will cause the damage of electrical equipment and influence peoples health. In this study, stain steel filament (SS filament) and 75D PET filament were used to manufacture SS/PET composite yarn The SS/PET composite yarn were made by the wrapping machine, which the core yarn is stain steel filament, wrapped yarn is 75D PET filament and the wrapping layers is varied as one and two. After that, the composite yarn is fabricated by the automatic sampling loom into composite woven fabrics. The composite SS/PET woven fabrics were under the tests of electromagnetic shielding effectiveness (EMSE) and air permeability. The test results revealed that the EMSE of the one-layer composite woven fabric is 9.5 dB at 900 MHz, but the EMSE decreases as test frequency increases. When laminating layer added to three layers, the EMSE raise up to 12.6 dB. The EMSE of composite woven fabric reached at 29.9 when the laminated angle is 45°. And the air permeability decreases as the laminate layer increases, which the thickness of sample affect air to pass through the sample.

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Kadhim, Asaad M. H., Hesham A. Numan e Mustafa Özakça. "Flexural Strengthening and Rehabilitation of Reinforced Concrete Beam Using BFRP Composites: Finite Element Approach". Advances in Civil Engineering 2019 (4 marzo 2019): 1–17. http://dx.doi.org/10.1155/2019/4981750.

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Basalt fiber-reinforced polymer (BFRP) is adopted widely in recent years in many countries to rehabilitate or strengthen structural elements such as reinforced concrete (RC) beams because it is cheap and it has stellar mechanical performance. By activating the finite element (FE) simulation, the present research submits an extensive study on the strengthening and rehabilitation of damaged full-scale RC beams due to corrosions in the main reinforcement caused by BFRP sheets. Different parameters were taken into consideration such as corrosion grade, BFRP wrapping schemes, and the number of layers. The flexural performance of the models that build up as the control model and the damaged and the repaired methodologies by BFRP that are adopted and tested by others under the effects of four-point static loadings were also underwent examination. The full interaction at BFRP-concrete interface and the full bonding between sheets presupposed were investigated for all models. The numerical analysis findings were compared with the experimental measurements and found to be in good agreement. The current numerical analysis proved that the ultimate load rised by 14.8% in spite of 20% corrosion in the flexural steel rebar under eight layers of BFRP composite and bottom wrapping mode. In addition, under all strategies of wrapping schemes, the findings also indicated that the deflection ductility index noticeably reduced for RC beams with BFRP composites compared to the control beam. Finally, all the results of midspan deflection, crack patterns, and strain response of the composite system were analysed and discussed briefly.

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27

Tang, Peiqi, e Dongwu Yang. "Static properties analysis of fiber optic wire wrapping". Journal of Physics: Conference Series 2578, n. 1 (1 agosto 2023): 012027. http://dx.doi.org/10.1088/1742-6596/2578/1/012027.

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Abstract To improve the quality of fiber optic wire wrapping, the influence of each parameter of fiber optic wire wrapping on the stress distribution of wire wrapping is studied, and the mechanical properties of fiber optic wire wrapping are simulated based on the principle of fine mechanics of composite materials. Solid elements are used for modeling through finite element analysis, and the problem of using ANSYS to solve the wire package is initially solved by establishing a 1° model for analysis and calculation. The results show that the core cylinder slightly, core cylinder radius, and fiber diameter have no effect on the stress distribution state of the fiber in the wire pack, but if the core cylinder stiffness increases, the minimum stress value of the wire pack will also increase, and the minimum stress area of the fiber unit tends to be far from the core cylinder surface.

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28

Wang, Chen Yang, Bing Bing Fan, Bing Sun, Bin Bin Wang, Wen Li, Hao Chen, Xiao Xuan Pian, Biao Zhao e Rui Zhang. "Effect of CNTs on Mechanical Properties of SiC_p/Cu Composites". Key Engineering Materials 602-603 (marzo 2014): 590–93. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.590.

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SiCp/Cu composites were prepared by vacuum hot-pressing at 770°C for 1.5 h under the pressure of 30MPa. The composites were enhanced by CNTs with different volume fractions from 0 vol. % to 4 vol. %. Three-step approach wrapping process was introduced to prepare composite powders. XRD and SEM techniques were used to characterize the samples. It is found that the core-shell structure composed of SiC core and Cu shell was formed in the composite particles. Optimized volume fraction of CNTs is 1 vol. %. Minimum Porosity and maximum Hardness is about 0.84% and 2.31GPa, respectively. But maximum Flexural strength was measured as 248MPa for samples containing 2 vol. % CNTs. Flexural strength was improved by the bridge effect caused by the increased CNTs.

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Pandey,, Neetesh Kumar, e Dr Sunil Kumar. "Mechanical Characterization and Feasibility Analysis of Polymer Fiber Composite Material". International Journal for Research in Applied Science and Engineering Technology 11, n. 1 (31 gennaio 2023): 305–10. http://dx.doi.org/10.22214/ijraset.2023.48445.

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Abstract: The most prevalent reinforcing component in composite materials is carbon fiber. However, obtaining the monofilament's performance metrics of carbon fiber is a challenging task. In this study, we have used PolyVinyl Chloride (PVC) sheets having low mechanical properties. Our goal is to improve the mechanical properties of PVC sheets with the wrapping of carbon fiber. The wrapping of carbon fiber is done by the Hand Lay up method. In this paper, we analyze and compare the mechanical properties of the sheet by using two, four and six layers of carbon fiber on PVC sheets . The main aim of this study is to enhance the mechanical properties of PVC sheets by increasing the number of layers of carbon fiber without replacing the sheet and without enhancing the overall cost.

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Kara, Memduh, Mesut Uyaner e Ahmet Avci. "Repairing impact damaged fiber reinforced composite pipes by external wrapping with composite patches". Composite Structures 123 (maggio 2015): 1–8. http://dx.doi.org/10.1016/j.compstruct.2014.12.017.

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31

Amir, A. L., S. Yamunan, M. R. Ishak, N. Yidris e M. Y. M. Zuhri. "Flexural Creep Behavior in Utilization of Woven Glass-Fibre as Reinforcement in Pultruded Glass Fibre-Reinforced Polymer Composite Cross-Arms: Experimental and Numerical Analysis". E3S Web of Conferences 477 (2024): 00007. http://dx.doi.org/10.1051/e3sconf/202447700007.

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Abstract (sommario):

Pultruded glass fiber-reinforced polymer (PGFRP) composite is a relatively new material used to replace conventional wood in the fabrication of cross-arms for transmission towers. Much research has been undertaken on coupon-scale PGFRP composite cross-arms. However, a few have been completed on full-scale PGFRP composite cross-arms under actual operating load. Thus, this work investigates the effect of wrapping woven glass fiber fabric as an additional reinforcement on the creep reactions of PGFRP composite cross-arms installed in a 132 kV transmission tower. In the first stage of this research, the deflection of the original cross-arm under various loads ranging from 0 to 9 kN was evaluated and was followed by the actual working loads. This experiment was repeated on cross-arms wrapped with different numbers of glass fiber fabric layers around the weakest point of the beam. Then, the creep behaviors and responses of the woven glass fiber-reinforced cross-arms were evaluated and compared with the original cross-arms from the previous study. The actual operating load was applied to the PGFRP composite cross-arms for 1000 hours to study their capability to support the weight of electrical cables and insulators. In order to replicate the tropical climate, the cross-arm were mounted on a test rig in an open area. The findings of this study revealed that reinforcing the cross-arm by wrapping it with woven glass fiber fabric could extend its life and hence reduce the maintenance cost and effort for long-term usage. The finding of this study will also become essential knowledge on woven fabric wrapping applications on square profiles.

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Praveen Kumar, A. "Experimental analysis on the axial crushing and energy absorption characteristics of novel hybrid aluminium/composite-capped cylindrical tubular structures". Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 233, n. 11 (10 aprile 2019): 2234–52. http://dx.doi.org/10.1177/1464420719843157.

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In recent years, aluminium-composite hybrid tubular structures, which combine the stable and progressive plastic deformation of the aluminium metal with light-weight composite materials, are obtaining increased consideration for meeting the advanced needs of crashworthiness characteristics. This research article presents the experimental outcomes of novel aluminium/composite-capped cylindrical tubes subjected to quasi-static and impact axial loads. The influence of various capped geometries in the aluminium segment and three different fabrics of the composite segment in the cylindrical tube are investigated experimentally. The outcomes of the impact crushing test are also correlated with the quasi-static results of the proposed aluminium/composite-capped cylindrical tubes. The overall outcomes revealed that the crashworthiness characteristics of crushing force consistency and specific energy absorption of the aluminium-composite hybrid tubes are superior to those of the bare aluminium tubes. When the glass fabric/epoxy composite is wrapped to aluminium cylindrical tubes, the specific energy absorption increases about 23–30%, and the wrapping of hybrid glass/kenaf fabrics increases the specific energy absorption of almost 40–52%. Such a hybrid tubular structures would be of huge prospective to be used as effective energy-absorbing devices in aerospace and automotive applications. A further benefit of the composite-wrapping approach is that the composite might be retro-fitted to aluminium tubes, and the energy absorption capability is shown to be significantly enhanced by such utilization.

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Du, Mei, e Li Bin Lv. "Study on Structure and Property of Polyester/Cotton/Silk Three-Component Sirofil Spun Composite Yarn". Advanced Materials Research 175-176 (gennaio 2011): 524–28. http://dx.doi.org/10.4028/www.scientific.net/amr.175-176.524.

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Abstract (sommario):

In this paper, by comparing the properties of polyester/cotton/silk three-component Sirofil composite yarn and traditional cotton yarn, polyester/cotton core-spun yarn, silk/cotton two-component Sirofil composite yarn, the structural characteristics of three-component Sirofil composite yarn and the relationship between its structure and property were explored. There was the inhibition effect of cotton fiber on polyester filament, so the frictional and cohesive force between cotton fiber and polyester filament could be enhanced. The tenacity of polyester filament and cotton fiber were very good and the wrapping effect of raw silk could enhance the cohesive force between cotton fibers, cotton fiber and polyester filament. Therefore, the strength of composite yarn was obviously increased and the abrasive resistance and anti-stripping wool property were also greatly enhanced. Secondly, hairiness between raw silk and fiber strand was very easily captured by raw silk and there was the wrapping effect of raw silk on fiber strand in the composite spinning, so some hairiness was covered by raw silk, which could decrease the length of hairiness or eliminate hairiness. Furthermore, much more uniform raw silk and polyester filaments were added, which could increase the yarn evenness of Sirofil composite yarn.

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34

Shi, Kun, Zhengjie Xu, Dawei Zheng, Zeheng Yang e Weixin Zhang. "Sandwich-like solid composite electrolytes employed as bifunctional separators for safe lithium metal batteries with excellent cycling performance". Journal of Materials Chemistry A 10, n. 9 (2022): 4660–70. http://dx.doi.org/10.1039/d1ta10641d.

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Abstract (sommario):

A solid composite electrolyte-like bifunctional separator customized for lithium metal batteries, is developed by wrapping a PP substrate with PVDF–DBDPO layers on both sides, enabling high fire resistance and excellent cycling performance.

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35

He, Dong, Jiang Feng Dong, Shu Cheng Yuan e Qing Yuan Wang. "Load Carrying Capacity and Ductility of CFRP-Reinforced Earthquake Waste Filled Circular Steel Tube Columns". Advanced Materials Research 463-464 (febbraio 2012): 234–38. http://dx.doi.org/10.4028/www.scientific.net/amr.463-464.234.

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In order to significantly increase not only the load carrying capacity but also the ductility of the steel tube columns filled with recycled aggregate concrete from the earthquake waste, two different strengthening methods by using externally bonded of carbon fibre reinforced polymer (CFRP) to strengthened the columns was proposed. Composite columns of CFRP reinforced and steel circular steel tube columns are studied in this study. The aims were to study the contribution of the CFRP sheets applied in enhancing the load carrying capacity and ductility of the steel tube columns with different concrete type, normal concrete and recycled aggregate concrete. The results demonstrate that the ultimate load carrying capacity and ductility of the steel tube columns filled with recycled aggregate concrete can be increased satisfactorily by full wrapping and partial wrapping arrangement of CFRP sheets. Moreover, stiffness of the columns strengthened was also increased greatly due to the restraining effect offered by CFRP and the full wrapping arrangement is better than the partial wrapping arrangement in enhancing the stiffness and the load carrying capacity.

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36

Alhendal, Abdullah, Randa Abd Almoaeen, Mohamed Rashad, Ali Husain, Fouzi Mouffouk e Zahoor Ahmad. "Aramid-wrapped CNT hybrid sol–gel sorbent for polycyclic aromatic hydrocarbons". RSC Advances 12, n. 28 (2022): 18077–83. http://dx.doi.org/10.1039/d2ra02659g.

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Abstract (sommario):

This work describes the preparation of an analytical microextraction sorbent using a simple and versatile sol–gel hybrid composite, i.e., aramid oligomers wrapping multi-walled carbon nanotubes (CNTs) covalently bonded to a porous silica network.

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37

Wang, Yinao. "The grey interval prediction method and its prediction accuracy". Grey Systems: Theory and Application 4, n. 2 (29 luglio 2014): 339–46. http://dx.doi.org/10.1108/gs-05-2014-0013.

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Abstract (sommario):

Purpose – The purpose of this paper is to discuss the interval forecasting, prediction interval and its reliability. When the predicted interval and its reliability are construction, the general rule which must satisfy is studied, grey wrapping band forecasting method is perfect. Design/methodology/approach – A forecasting method puts forward a process of prediction interval. It also elaborates on the meaning of interval (the probability of the prediction interval including the real value of predicted variable). The general rule is abstracted and summarized by many forecasting cases. The general rule is discussed by axiomatic method. Findings – The prediction interval is categorized into three types. Three axioms that construction predicted interval must satisfy are put forward. Grey wrapping band forecasting method is improved based on the proposed axioms. Practical implications – Take the Shanghai composite index as the example, according to the K-line diagram from 4 January 2013 to 9 May 2013, the reliability of predicted rebound height of subsequent two or three trading day does not exceed the upper wrapping curve is 80 per cent. It is significant to understand the forecasting range correctly, build a reasonable range forecasting method and to apply grey wrapping band forecasting method correctly. Originality/value – Grey wrapping band forecasting method is improved based on the proposed axioms.

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Bourtoom, T., e M. S. Chinnan. "Improvement of Water Barrier Property of Rice Starch-chitosan Composite Film Incorporated with Lipids". Food Science and Technology International 15, n. 2 (aprile 2009): 149–58. http://dx.doi.org/10.1177/1082013208105993.

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Abstract (sommario):

This study investigated the effect of lipid types (oleic acid, palm oil, and margarine) and their concentrations (0, 10, 20, 30, 40, and 50wt%) on the water vapor permeability (WVP), tensile strength (TS), percentage of elongation at break (%E), and structure of emulsified rice starch-chitosan composite film. The influence of rice starch-chitosan composite film incorporated with lipids in controlling the moisture transfer in moisture-sensitive products was determined by wrapping a low aw-type cracker product in rice starch-chitosan composite film. TS and WVP of rice starch-chitosan composite film decreased with the addition of lipids, whereas %E increased in these films. Addition of lipids significantly raised film yellowness for composite films. The results showed that films added with oleic acid gave higher L*, b*, and chroma values but lower a* value than margarine and palm oil, respectively. The lower transparency of the films was noticed when a greater amount of lipid was incorporated (p < 0.05). Oleic acid-incorporated films provided the films with smoother surface and higher values of TS and %E but lower WVP than margarine and palm oil, respectively. Wrapping cracker samples in the rice starch-chitosan composite film incorporated with oleic acid could maintain the hardness and provide longer shelf life and lower moisture content than synthetic polyvinyl chloride film (PVC) and unwrapped (reference) crackers, respectively.

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Wahab, Srinophakun, Hussain e Chaimahawan. "Performance of Concrete Confined with a Jute–Polyester Hybrid Fiber Reinforced Polymer Composite: A Novel Strengthening Technique". Fibers 7, n. 8 (8 agosto 2019): 72. http://dx.doi.org/10.3390/fib7080072.

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Abstract (sommario):

The strengthening and rehabilitation of concrete members is an important issue which arises worldwide. Carbon, aramid and glass fiber reinforced polymer (FRP) composites are mainly used for strengthening and rehabilitation. However, its use is limited on a small scale because of its high price, lack of availability and environmental impacts. The solution of this issue gives rise to the use of locally available natural fibers and low-cost synthetic fibers. This paper presents the experimental and analytical results of circular and square concrete columns confined with jute–polyester hybrid FRP composites. The main objective of this study is to evaluate the viability and performance of concrete confined with the hybridization of jute and polyester (FRP) composite sheets to utilize its superior properties. A novel hybrid technique has been applied for the wrapping of fiber sheets. The fiber sheets were applied in such a way that a uniform bond between the inner and outer layer was achieved. A total of 32 plain, standard size circular and square concrete specimens, externally wrapped with a jute–polyester FRP (JPFRP) composite, were tested under monotonic axial compressive loads. The result shows that JPFRP confinement increased the strength, strain and ductility index ranged between 1.24 and 2.61, 1.38 and 8.97, and 4.94 and 26.5 times the un-jacketed specimen, respectively. Furthermore, the wrapping has a significant effect on the low-strength specimens, having a circular cross-section. For high strength specimens, the post-peak stress-strain behavior was dominated by the outer polyester jacket because of its large rupture strain. Additionally, the test results were used to evaluate the existing strength-strain models derived for conventional FRPs. The models predicted values either underestimating or overestimating the compressive strength and strain of JPFRP-confined specimens. However, the strength models performed better than the strain models. The JPFRP wrapping significantly enhanced the strength, fracture energy, ductility index, and post-peak response. Therefore, JPFRP confinement can be used for a small-scale application, where little strength and high ductility is demanded. Moreover, it can be used to prevent the peeling of the concrete cover and moisture penetration into the concrete.

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40

Bhuyan, G. S. "Effect of Composite Damage on the Fatigue Behavior of the Metal-Lined Hoop-Wrapped Cylinders". Journal of Pressure Vessel Technology 114, n. 1 (1 febbraio 1992): 120–23. http://dx.doi.org/10.1115/1.2929002.

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Abstract (sommario):

Effects of an axial defect in the composite of hoop-wrapped steel and aluminum cylinders on the hoop stress as well as on the bulging of the liners were investigated through the numerical and experimental stress analysis. Comparison with the experimental results (reported in reference [5]) suggests that relative fatigue performance of the cylinders, containing damages to the composite wrapping, can be assessed without conducting prototype tests.

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Zeng, Lijian, Wenwu Tao, Junjie Zhao, Yichao Li e Renfu Li. "Mechanical performance of a CFRP composite reinforced via gelatin-CNTs: A study on fiber interfacial enhancement and matrix enhancement". Nanotechnology Reviews 11, n. 1 (1 gennaio 2022): 625–36. http://dx.doi.org/10.1515/ntrev-2022-0040.

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Abstract This study investigates the effect of a bio-surfactant gelatin-modified carbon nanotubes (g-CNTs) on the fiber interfacial property and matrix performance of carbon fiber-reinforced polymer (CFRP) composite. Transverse fiber bundle test (TFBT) and in situ three-point bending test were conducted to analyze the fiber/matrix interfacial normal strength (IFNS) and bulk mechanical performance of the CNTs–CFRP composite. The results showed that g-CNTs have superb affinity and uniformity wrapping on the surface of carbon fiber via 2 min electrophoretic deposition (EPD) under a concentration of 0.1 mg/mL and a voltage strength of 10 V/cm, resulting in an increase of 40.3% of IFNS and 22.1%/25.3% of flexural strength/modulus of CFRP composites. Meanwhile, g-CNTs can also evenly distribute in the resin matrix with an improvement of 12.6% of IFNS and 20.3%/11.4% of flexural strength/modulus of CFRP composites under 0.1 wt% loading. This study provides a mechanism basis for the subsequent introduction of g-CNTs for the development of advanced CNT-reinforced CFRP composite.

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Oredokun-Lache, Blessing A., Esther B. Ibrahim, Adekemi G. Oluwafemi, Georgina O. Erifeta, Sunday J. Josiah e Olarewaju M. Oluba. "A circular economical application of eggshell waste as a bio-filler in the fabrication of gum Arabic composite film". Food Science and Preservation 31, n. 3 (giugno 2024): 394–407. http://dx.doi.org/10.11002/fsp.2024.31.3.394.

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The poultry industry faces disposal difficulty in waste, but recent advancements in material science and sustainability have enabled the innovative transformation of waste into valuable resources. In this study, eggshell (EC) was added as a bio-filler to gum Arabic (GA) to fabricate a GA-EC bio-composite film. Bio-composites containing 0.5 g (GA-EC0.5) and 1.0 g (GA-EC1.0) EC dispersed in 30 mL of 15% GA solution were fabricated and characterized using standard analytical techniques. The GA-EC0.5 composites showed significantly higher moisture content, transparency, water solubility, and water vapor permeability but lower tensile strength and thermal stability than GA-EC1.0. Following a post-harvest wrapping of tomato fruits with the GA-EC composite films and storage at 25±2°C for 20 days, significant (p>0.05) reductions in weight loss, pH, lycopene content, and activities of polyphenol oxidase and pectin methylesterase compared to unwrapped fruits were recorded. Adding EC to GA has enabled the fabrication of composite films with improved mechanical, barrier, and thermal properties with potential application in the post-harvest storage of tomato fruits.

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Pradhan, Soumya Priyadarsini, Manoj Kumar Rath e Rakesh Kumar Jena. "Strengthening of Precast Concrete Manhole Cover using GFRP Wrapping System". Circulation in Computer Science MCSP2017, n. 01 (24 settembre 2017): 1–3. http://dx.doi.org/10.22632/ccs-2017-mcsp024.

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Abstract (sommario):

Today’s new high performance composite materials can be engineered to meet specific and critical needs in modern cities and industries. Fiber Reinforced Polymer (FRP) is considered to be the best alternate material for manhole covers as it has longer life span and has the capability to withstand heavy load. The invention related to Strengthening of precast concrete manhole cover by using fiber composite. Three sample of circular manhole cover were constructed for this experimental test program. Two different strengthening schemes were used in this paper. Sample 1 includes strengthened control slabs and other two were strengthened with Glass Fiber Reinforced Polymer (GFRP) Laminates. The strengthening of manhole covers was done with different layers of GFRP wraps. This is why investigation was undertaken to increase the durability of precast concrete covers. The high effectiveness of fiber reinforcement enhancing the load bearing capacity of concrete covers was investigated.

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Brown, Alan S. "Running Energy". Mechanical Engineering 121, n. 06 (1 giugno 1999): 58–61. http://dx.doi.org/10.1115/1.1999-jun-4.

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Composite Power Corp., Las Vegas, plans to use composites as a key material in a wind turbine a quarter-mile across that will turn on air or magnetic bearings in breezes as mild as 3 mph. Composite towers cost more than steel, however, are cheaper to transport and easier to assemble on-site, making them cost-competitive, especially in remote areas. Since composite towers have small footprints, they can share rights of way with railroad tracks. The system is designed so even if a car jumps the track and takes out up to three towers, the fiber-reinforced cable will remain intact. Beginning with inexpensive coal fuel, the proposed Montana-Wisconsin line will deliver power for an estimated 3 cents a kilowatt, compared with the 4 to 9 cents a kilowatt it costs other state utilities. The heart of the technology consists of cables made of aluminum strengthened by a composite wrapping. Although aluminum has a generous current-carrying capacity, its poor mechanical strength has curbed its role in power transmission lines.

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Park, Choon Wook, Ik Hun Park, Dong Hwi Kim e Yeol Choi. "Seismic Retrofitting of School Facilities Using Attaching and Wrapping Composite Materials". Advanced Materials Research 935 (maggio 2014): 155–58. http://dx.doi.org/10.4028/www.scientific.net/amr.935.155.

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An experimental and analytical study have been conducted for the shear reinforcing method of RC beam by axis and horizontal axis load using attaching composite beam. Based on the previous research, in this study, Design examples are given to show the performance evaluation for the column reinforcing of old school buildings using nonlinear analysis is going to be conducted and strengthening method is going to be on the market after their performance is proved by the test.

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Lee, Kyeong-Kyoo, e Wie-Dae Kim. "Behavior and Optimization of Cylinder Applied by Composite Tape Wrapping Method". Journal of The Korean Society for Composite Materials 24, n. 2 (30 aprile 2011): 22–29. http://dx.doi.org/10.7234/kscm.2011.24.2.022.

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47

Rokotov, N. V., M. V. Bekker, I. M. Bespalova e A. V. Markovets. "A Device for Spiral Winding of Wrapping Bundle of Composite Armature". Fibre Chemistry 50, n. 5 (gennaio 2019): 483–86. http://dx.doi.org/10.1007/s10692-019-10014-7.

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48

Park, Choon-Wook. "Seismic Retrofit of the Public Facilities Using the Wrapping Composite Plate". Journal of The korean Association For Spatial Structures 23, n. 3 (15 settembre 2023): 45–55. http://dx.doi.org/10.9712/kass.2023.23.3.45.

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49

Alshukur, Malek, e George Stylios. "Engineering the geometry of novel yarns for flexible, hybrid composites Part I: Multiple breaks". Journal of Composite Materials 56, n. 10 (20 marzo 2022): 1577–89. http://dx.doi.org/10.1177/00219983221080502.

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Abstract (sommario):

This study reports on the development of a novel form of yarn reinforcement for making super tough, flexible composites. The concept is based on the rupturing of components of the composite yarn many times before totally breaking. The composite yarn structure has a configuration of three main components − helical, straight and sinusoidal. The components are not restricted by the type of raw material, and any type of fibre or blend can be used. Experimentally, the hollow-spindle spinning system was used to make nine variants of this composite yarn. These variants were tested for their tensile behaviour at an extension rate of 250 mm/min. It was found that the core component of two of the nine variants had eight breakages, while the core component of the remaining variants had four to five breakages before the final break of the core component. The main mechanism that allows the core component yarn to break so many times is a locking applied to it by the wrapping yarn during stretching. The gain in strength for these variants was 21–81% in comparison with a typical twistless composite yarn. Flexible composites made of such yarn configurations can find numerous uses in construction, geotextiles, ballistic protective garments, aerospace, automotive and shipping industries.

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Lee, Jungeon, Sabina Yeasmin, Jae Hoon Jung, Tae Young Kim, Tae Yeong Kwon, Da Yeong Kwon e Jeong Hyun Yeum. "Preparation and Characterization of Thermal-Insulating Microporous Breathable Al/LLDPE/CaCO3 Composite Films". Materials 16, n. 12 (7 giugno 2023): 4230. http://dx.doi.org/10.3390/ma16124230.

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Abstract (sommario):

Breathable films were prepared based on linear low-density polyethylene (LLDPE), calcium carbonate (CaCO3), and aluminum (Al; 0, 2, 4, and 8 wt.%) using extrusion molding at a pilot scale. These films must generally be able to transmit moist vapor through pores (breathability) while maintaining a barrier to liquids; this was accomplished using properly formulated composites containing spherical CaCO3 fillers. The presence of LLDPE and CaCO3 was confirmed by X-ray diffraction characterization. Fourier-transform infrared spectroscopy results revealed the formation of Al/LLDPE/CaCO3 composite films. The melting and crystallization behaviors of the Al/LLDPE/CaCO3 composite films were investigated using differential scanning calorimetry. Thermogravimetric analysis results show that the prepared composites exhibited high thermal stability up to 350 °C. Moreover, the results demonstrate that surface morphology and breathability were both influenced by the presence of various Al contents, and their mechanical properties improved with increasing Al concentration. In addition, the results show that the thermal insulation capacity of the films increased after the addition of Al. The composite with 8 wt.% Al showed the highest thermal insulation capacity (34.6%), indicating a new approach to transform composite films into novel advanced materials for use in the fields of wooden house wrapping, electronics, and packaging.

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