Academic literature on the topic 'Multi-scale Hybrid composite'
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Journal articles on the topic "Multi-scale Hybrid composite"
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Ebrahimi, Farzad, and Ali Dabbagh. "On thermo-mechanical vibration analysis of multi-scale hybrid composite beams." Journal of Vibration and Control 25, no. 4 (October 22, 2018): 933–45. http://dx.doi.org/10.1177/1077546318806800.
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This article is primarily organized to analyze the thermo-elastic vibrational characteristics of multi-scale hybrid composite beams according to a refined beam model. In this novel type of composites, multi-scale reinforcing elements, carbon fiber (CF) and carbon nanotube (CNT) in particular, are presumed to be dispersed in an initial resin. The homogenization process is carried out employing a mixture of the Halpin–Tsai model and the rule of mixture. The effect of temperature and its gradient on the mechanical properties of CNTs and epoxy resin is rendered to present a more reliable thermal analysis. On the other hand, a refined trigonometric shear deformable beam theory is extended to derive the kinematic relations of the beam needless of any external shear correction coefficient. On the basis of Hamilton's principle, the partial differential equations of motion are developed. Thereafter, the natural frequencies are achieved by the means of Galerkin's method for both simply supported and fully clamped edge conditions. Then, the validity of the presented model is shown by comparing these results with those of previously published researches. Finally, effects of different parameters on the natural frequency of composite beams are rendered in the framework of some numerical case studies. It can be found that multi-scale hybrid composite beams can satisfy higher frequencies once compared with each of the CF- or CNT-reinforced composite beams.
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Georgantzinos, Stelios K., Panagiotis A. Antoniou, and Stylianos I. Markolefas. "A Multi-Scale Method for Designing Hybrid Fiber-Reinforced Composite Drive Shafts with Carbon Nanotube Inclusions." Journal of Composites Science 5, no. 6 (June 10, 2021): 157. http://dx.doi.org/10.3390/jcs5060157.
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In this paper, the modal and linear buckling analysis of a laminated composite drive shaft reinforced by 11 multi-walled carbon nanotubes (MWCNTs) was carried out using an analytical approach, as well as the finite element method (FEM). The theoretical model is based on classical laminated theory (CLT). The fundamental frequency and the critical buckling torque were determined for different fiber orientation angles. The Halpin–Tsai model was employed to calculate the elastic modulus of composites having randomly oriented nanotubes. The effect of various carbon nanotube (CNT) volume fractions in the epoxy resin matrix on the material properties of unidirectional composite laminas was also analyzed. The fundamental frequency and the critical buckling torque obtained by the finite element analysis and the analytical method for different fiber orientation angles were in good agreement with each other. The results were verified with data available in the open literature, where possible. For the first time in the literature, the influence of CNT fillers on various composite drive shaft design parameters such as the fundamental frequency, critical speed, and critical buckling torque of a hybrid fiber-reinforced composite drive shaft is finally predicted.
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Yu, Wei, Nikunjkumar Visaveliya, Christophe A. Serra, J. Michael Köhler, Shukai Ding, Michel Bouquey, René Muller, Marc Schmutz, and Isabelle Kraus. "Preparation and Deep Characterization of Composite/Hybrid Multi-Scale and Multi-Domain Polymeric Microparticles." Materials 12, no. 23 (November 27, 2019): 3921. http://dx.doi.org/10.3390/ma12233921.
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Polymeric microparticles were produced following a three-step procedure involving (i) the production of an aqueous nanoemulsion of tri and monofunctional acrylate-based monomers droplets by an elongational-flow microemulsifier, (ii) the production of a nanosuspension upon the continuous-flow UV-initiated miniemulsion polymerization of the above nanoemulsion and (iii) the production of core-shell polymeric microparticles by means of a microfluidic capillaries-based double droplets generator; the core phase was composed of the above nanosuspension admixed with a water-soluble monomer and gold salt, the shell phase comprised a trifunctional monomer, diethylene glycol and a silver salt; both phases were photopolymerized on-the-fly upon droplet formation. Resulting microparticles were extensively analyzed by energy dispersive X-rays spectrometry and scanning electron microscopy to reveal the core-shell morphology, the presence of silver nanoparticles in the shell, organic nanoparticles in the core but failed to reveal the presence of the gold nanoparticles in the core presumably due to their too small size (c.a. 2.5 nm). Nevertheless, the reddish appearance of the as such prepared polymer microparticles emphasized that this three-step procedure allowed the easy elaboration of composite/hybrid multi-scale and multi-domain polymeric microparticles.
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Ma, Xiangtao, Kuo Tian, Hongqing Li, Yan Zhou, Peng Hao, and Bo Wang. "Concurrent multi-scale optimization of hybrid composite plates and shells for vibration." Composite Structures 233 (February 2020): 111635. http://dx.doi.org/10.1016/j.compstruct.2019.111635.
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Gautam, M., K. B. Katnam, P. Potluri, V. Jha, J. Latto, and N. Dodds. "Hybrid composite tensile armour wires in flexible risers: A multi-scale model." Composite Structures 162 (February 2017): 13–27. http://dx.doi.org/10.1016/j.compstruct.2016.11.090.
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Song, Kyoungho, Hansol Son, Suwon Park, Jonghan Lee, Jungsik Jang, Mijung Lee, and Hyun-joo Choi. "Fabrication of Piezo-Resistance Composites Containing Thermoplastic Polyurethane/Hybrid Filler Using 3D Printing." Sensors 21, no. 20 (October 13, 2021): 6813. http://dx.doi.org/10.3390/s21206813.
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In this study, 3D-printable flexible piezoresistive composites containing various amounts of cilia-like hybrid fillers were developed. In the hybrid fillers, micro-scale Cu particles with a 0D structure may allow them to easily disperse into the flexible TPU matrix. Furthermore, nanoscale multi-walled carbon nanotubes (MWCNTs) with a high aspect ratio, present on the surface of the Cu particles, form an electrical network when the polymer matrix is strained, thus providing good piezoresistive performance as well as good flowability of the composite materials. With an optimal hybrid filler content (17.5 vol.%), the 3D-printed piezoresistive composite exhibits a gauge factor of 6.04, strain range of over 20%, and durability of over 100 cycles. These results highlight the potential applications of piezoresistive pressure sensors for health monitoring, touch sensors, and electronic skin.
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Catera, Piervincenzo Giovanni, Francesco Gagliardi, Domenico Mundo, Luigi De Napoli, Anna Matveeva, and Laszlo Farkas. "Multi-scale modeling of triaxial braided composites for FE-based modal analysis of hybrid metal-composite gears." Composite Structures 182 (December 2017): 116–23. http://dx.doi.org/10.1016/j.compstruct.2017.09.017.
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Ab Ghani, Ahmad Fuad, and Jamaluddin Mahmud. "Material Characterization of Hybrid Composite: Experimental Using Strain Gauge/DIC with Finite Element Modelling Macro/Micro Scale." Key Engineering Materials 740 (June 2017): 31–40. http://dx.doi.org/10.4028/www.scientific.net/kem.740.31.
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The study presents the multi methods of determining mechanical properties and mechanical characterization under tensile loading of hybrid composite in the form of experimental technique involving measurement of strain using strain gauge and digital image correlation (DIC) technique utilizing open source platform Ncorr to compute the strain on surface of hybrid composite. The method of micro mechanical modelling using Finite Element Modelling (FEM) in the mode of representation volume element (RVE) method and macro scale FEM using commercial software Ansys have been performed to compute the modulus of elasticity in direction of uniaxial tensile loading. The four methods then compared which yields very consistent results with each other. It is observed that all four methods are reliable in determining mechanical properties of unidirectional single composite as well as hybrid composite. The experimental involved the use of ASTM D3039 standard tensile test for hybrid composite and strain are measured using strain gauges and DIC.
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Ary Subagia, I. D. G., Leonard D. Tijing, and Yon Jig Kim. "Basalt Fabric-Electrospun Nanofiber-Based Composite Laminates." Applied Mechanics and Materials 465-466 (December 2013): 852–56. http://dx.doi.org/10.4028/www.scientific.net/amm.465-466.852.
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This study investigated the influence of electrospun polyurethane mats containing different contents of carbon nanotubes (CNTs) stacked in between basalt fabric layers to form a composite laminate. The composite laminate was fabricated using a vacuum-assisted resin transfer molding (VARTM) process. Flexural test were carried out to investigate the strength and stiffness of composites for each configuration, while the failure characteristics were observed using a field emission scanning electron microscopy (FESEM) analysis. The results showed that flexural strength and stiffness of the hybrid composites with increasing CNT content in polyurethane (PU) nanofiber were increased by 6.5% and 17.3%, respectively. Furthermore, the addition of surfactants for the dispersion of CNTs in nanofibers significantly improved the flexural property of the composite interply basalt fabric-CNT/PU laminates. This study proved that the use of multi-scale reinforcement fillers with good and homogeneous dispersion increased the mechanical performance of the composite.
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Ebrahimi, Farzad, Alireza Enferadi, and Ali Dabbagh. "Wave Dispersion Behaviors of Multi-Scale CNT/Glass Fiber/Polymer Nanocomposite Laminated Plates." Polymers 14, no. 24 (December 13, 2022): 5448. http://dx.doi.org/10.3390/polym14245448.
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In this paper, wave propagation in multi-scale hybrid glass fiber (GF)/carbon nanotube (CNT)/polymer nanocomposite plates is studied for the first time by means of refined higher-order plate theory. The hybrid nanocomposite consists of CNTs and glass fibers (GF) as reinforcing components distributed within a polymeric matrix. A hierarchical micromechanical approach is used to predict the effective mechanical properties of the hybrid nanocomposite, including the three-dimensional (3D) Mori-Tanaka method and the rule of mixture. Moreover, a refined-type higher-order shear deformation theory (HSDT) is implemented to take into account the influence of the shear deformation on the motion equations of the system. Then, the governing equations are achieved on the basis of the energy-based Hamilton’s principle. Finally, the derived equations will be solved analytically for the purpose of extracting the natural frequency of the continuous system. A set of numerical examples are provided to cover the effects of various parameters on the wave dispersion characteristics of the plate. It can be declared that the hybrid nanocomposite system can achieve higher wave frequencies compared with other types of composite structures. Additionally, it is found that the selection of the lay-ups and length-to-diameter ratio plays a significant role in the determination of the sandwich plate’s acoustic response.
Dissertations / Theses on the topic "Multi-scale Hybrid composite"
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Horton, Brandon Alexander. "Comprehensive Multi-Scale Progressive Failure Analysis for Damage Arresting Advanced Aerospace Hybrid Structures." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/93961.
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In recent years, the prevalence and application of composite materials has exploded. Due to the demands of commercial transportation, the aviation industry has taken a leading role in the integration of composite structures. Among the leading concepts to develop lighter, more fuel-efficient commercial transport is the Pultruded Rod Stitched Efficient Unitized Structure (PRSEUS) concept. The highly integrated structure of PRSEUS allows pressurized, non-circular fuselage designs to be implemented, enabling the feasibility of Hybrid Wing Body (HWB) aircraft. In addition to its unique fabrication process, the through-thickness stitching utilized by PRSEUS overcomes the low post-damage strength present in typical composites. Although many proof-of-concept tests have been performed that demonstrate the potential for PRSEUS, efficient computational tools must be developed before the concept can be commercially certified and implemented.
In an attempt to address this need, a comprehensive modeling approach is developed that investigates PRSEUS at multiple scales. The majority of available experiments for comparison have been conducted at the coupon level. Therefore, a computational methodology is progressively developed based on physically realistic concepts without the use of tuning parameters. A thorough verification study is performed to identify the most effective approach to model PRSEUS, including the effect of element type, boundary conditions, bonding properties, and model fidelity. Using the results of this baseline study, a high fidelity stringer model is created at the component scale and validated against the existing experiments. Finally, the validated model is extended to larger scales to compare PRSEUS to the current state-of-the-art.
Throughout the current work, the developed methodology is demonstrated to make accurate predictions that are well beyond the capability of existing predictive models. While using commercially available predictive tools, the methodology developed herein can accurately predict local behavior up to and beyond failure for stitched structures such as PRSEUS for the first time. Additionally, by extending the methodology to a large scale fuselage section drop scenario, the dynamic behavior of PRSEUS was investigated for the first time. With the predictive capabilities and unique insight provided, the work herein may serve to benefit future iteration of PRSEUS as well as certification by analysis efforts for future airframe development.PHD
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Sun, Mingkun Sun. "MULTISCALE HYBRID ELEMENT MODELING OF TRIAXIAL BRAIDED COMPOSITE." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1533550804106857.
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Giuntoli, Guido. "Hybrid CPU/GPU implementation for the FE2 multi-scale method for composite problems." Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/668824.
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This thesis aims to develop a High-Performance Computing implementation to solve large composite materials problems through the use of the FE2 multi-scale method. Previous works have not been able to scale the FE2 strategy to real size problems with mesh resolutions of more than 10K elements at the macro-scale and 100^3 elements at the micro-scale. The latter is due to the computational requirements needed to carry out these calculations.
This works identifies the most computationally intensive parts of the FE2 algorithm and ports several parts of the micro-scale computations to GPUs. The cases considered assume small deformations and steady-state equilibrium conditions. The work provides a feasible parallel strategy that can be used in real engineering cases to optimize the design of composite material structures. For this, it presents a coupling scheme between the MPI multi-physics code Alya (macro-scale) and the CPU/GPU-accelerated code Micropp (micro-scale). The coupled system is designed to work on multi-GPU architectures and to exploit the GPU overloading. Also, a Multi-Zone coupling methodology combined with weighted partitioning is proposed to reduce the computational cost and to solve the load balance problem. The thesis demonstrates that the method proposed scales notably well for the target problems, especially in hybrid architectures with distributed CPU nodes and communicated with multiple GPUs. Moreover, it clarifies the advantages achieved with the CPU/GPU accelerated version respect to the pure CPU approach.Esta tesis apunta a desarrollar una implementación de alta performance computacional para resolver problemas grandes de materiales compuestos a través del método de Multi-Escala FE2. Trabajos previos no han logrado escalar la técnica FE2 a problemas de dimensiones reales con mayas de resolucion de más de 10 K elementos en la macro-escala y 100^3 elementos en la micro-escala. Esto último se debe a los requerimientos computacionales para llevar a cabo estos cálculos. Este trabajo identifica las partes computacionales más costosas del algoritmo FE2 y porta varias partes del cálculo de micro-escala a GPUs. Los casos considerados asumen condiciones de pequeñas deformaciones y estado estacionario de equilibrio. El trabajo provee una estrategía factible que puede ser usada en problemas reales de ingeniería para optimizar el diseño de estructuras de materiales compuestos. Para esto se presenta un esquema de acople entre el codigo MPI de multi-física Alya (macro-escala) y la versión acelerada CPU/GPU de Micropp (micro-escala). El sistema acoplado está diseñado para trabajar con arquitecturas de multiples GPUs y explotar la sobrecarga de GPUs. También, un método de multiple zonas de acople combinado con particionado pesado es propuesto para reducir el costo computacional y resolver el problema de balanceo de carga. La tesis demuestra que el método propuesto escala notablemente bien para los problemas modelo, especialmente en arquitecturas híbridas con nodos CPU distribuidos y comunicados con multiples GPUs. Más aún, la tesis clarifica las ventajas logradas con la versión acelerada CPU/GPU respecto a usar unicamente CPUs.
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Scott, Anna. "Analysis of a hybrid composite pressure vessel using multi-scale computed tomography techniques." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/196517/.
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In this work multi-scale CT techniques have been developed to characterise the material structure of PMCs, from the whole engineering structure geometry down to individual fibre level. The techniques have first been applied to a 'model' aerospace grade carbon/epoxy notched laminate loaded in-situ in tension to failure. The material structure and damage mechanisms of internally pressurised experimental cylinders have then been investigated and compared to the notched laminate. It was found the damage accumulation of both samples to be comparable, where fibre breaks were the dominant strength controlling mechanism. The data provides, to the authors knowledge, the first direct internal 3D measurement of the accumulation of fibre damage for commercial CFRP materials under structurally relevant load conditions. A high level of confidence is placed in the measurements, as the failure processes are viewed internally at the relevant micromechanical length-scales, as opposed to previous indirect and/or surface-based methods. Whilst fibre breaks are the dominant composite damage mechanism considered in the work, matrix damage was also seen to occur in advance of extensive fibre breaks. The formation of clusters of broken fibres were observed at high loads in both sample types. The largest clusters were observed in the notched laminate sample, consisting of a group of eleven breaks and a group of fourteen breaks. In comparison, clusters of only four neighbouring breaks were observed in the pressure vessel samples. A correlation between fibre volume fraction and fibre breaks was found, in which higher fibre volume fractions result in higher fibre break densities. No strong correlation was found between the location of matrix damage and fibre breaks in both sample types. Initial analysis showed some correlation between fibre breaks and voids, however further work has been recommended to confirm this. A simple 3D Finite Element Analysis was carried out for the pressure vessel to give an understanding of the stress partitioning through the composite layers and confirm the damage found experimentally. The data sets of the accumulation of fibre breaks with load provide evidence to validate or inform existing micromechanical models, for two different carbon fibre systems, where previous experimental findings are limited. A detailed comparison of the results of this work and the multi-scale micromechanical model of Blassiau and co-workers has been made, in which the underlying assumptions have been discussed.
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Gautam, Mayank. "Hybrid composite wires for tensile armour in flexible risers." Thesis, University of Manchester, 2001. https://www.research.manchester.ac.uk/portal/en/theses/hybrid-composite-wires-for-tensile-armour-in-flexible-risers(c5adfc24-9a23-40ab-a038-dba352df6fc4).html.
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Flexible risers that carry hydrocarbon fuels from the subsea facilities to the floatation units above the sea surface are composed of multiple metallic and polymeric layers (in their wall). Among these layers, the tensile armour layer consists of several helically wound metallic wires; these tensile armour layers carry the weight of the riser, provide tensile stiffness & strength and maintain the structural integrity of the riser structure during harsh underwater currents. However, as the oil & gas fields in shallow waters are receding, the oil & gas industry is being forced to move towards deeper offshore waters, where the metallic tensile armour wires pose limitations (fatigue, corrosion, weight, etc.). In this thesis an alternative to metallic tensile armour wires will be presented in form of a flexible hybrid composite formed by stacking seven pultruded composite (carbon and vinyl-ester) circular rods in form of hexagonal pack, held together by an over-braid (Dyneema fibres) sleeve. The manufacturing process for hybrid composite tensile armour wires will be studied and their mechanical properties will be presented. A multi-scale finite element model developed for hybrid composite wires will be presented in this thesis to help further understand the mechanical properties of hybrid composite wires.
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De, Nicola Antonio. "Development of molecular models of interfaces using a multi-scale hybrid particle-field approach: application to composite materials and biomembranes." Doctoral thesis, Universita degli studi di Salerno, 2014. http://hdl.handle.net/10556/1444.
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2012-2013The rule of the interface in systems including polymer composites and block-‐ copolymer interacting with biomembrane has been investigated by computational approach. In particular, for the polymer composite investigation, a system composed of PMMA embedding a silica nanoparticle of 3 nm (diameter), and an analogue system made of MMA and silica nanoparticle have been simulated. The structuration of both, PMMA and MMA close to the surface of the nanoparticle have been evaluated and calculated. As main results we found a stronger structuration of PMMA close to the nanoparticle respect to the MMA bulk. Pluronics based formulations are among the most successful nanomedicines and block-‐copolymer micelles including drugs are undergoing phase I/II studies as anticancer agents. Using coarse-‐grained models, molecular dynamics simulations of large-‐scale systems, modeling Pluronic micelles interacting with DPPC lipid bilayers, on the μs timescale have been performed. Simulations show, in agreement with experiments, a release of Pluronic chains from the micelle to the bilayer. This release changes the size of the micelle, moreover the presence of drug molecules inside the core of the micelle has a strong influence on this process. The picture emerging from the simulations is that the micelle stability is a result of an interplay between drug/micelle core and block-‐copolymer/bilayer interactions. The equilibrium size of the drug vector shows a strong dependency on the hydrophobicity of the drug molecules embedded into the core of the micelle. In particular, the radius of the micelle shows an abrupt increase in a very narrow range of drug molecule hydrophobicity. [edited by author]
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Lei, Feiran. "Homogenization of Heterogeneous Composites by Using Effective Electromagnetic Properties." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1299513068.
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Deng, Yan. "Mechanical Characterization of Carbon Nanotubes/Graphene Oxides Grafted onto Carbon Fibres and Their Hybrid Composites." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/18590.
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Carbon nanotubes (CNTs) and graphene oxides (GOs) grafted hybrid fibres are emerging as a class of material proposed to replace traditional carbon fibres (CFs) in reinforcing composite structures. Understanding the multi-scale mechanics is of great significance for future designing of high performance hybrid nanomaterials. This thesis investigates the mechanical properties of CNT/GO grafted CFs and their hybrid composites by utilizing both nanomechanical and micromechanical experimental techniques. The unique failure mechanisms of individual CNTs at nanoscale are investigated via in situ SEM pull-out, shear and peel tests. The effect of loading angle on the mixed mode adhesion toughness at a CNT-CF interface is investigated for the first time. An in situ peel test method that ensures a stable crack growth is developed for determining the adhesion energy between CNT-CNT and between CNT-CF. The shearing and failure behaviour of CNT-CNT junctions are investigated via in situ shear tests. A simple single-lap joint test is developed for determining the interfacial shear strength (IFSS) between fibre and matrix via non-instrument-specific technique. The influence of CNT grafting density on the IFSS is examined. A multi-scale analytical model is also developed. The mechanics of GO-grafted CF hybrid composites at each length scale are characterized via in situ pull-out tests and single-lap joint tests. In addition, single fibre tensile test results demonstrate that the strength of a CF could be maintained and even improved by introducing CNT/GO via our chemical grafting method. The high grafting strengths and enhanced tensile and interfacial shear strengths of the present CNT-CF and GO-CF hybrid materials can significantly increase the interfacial and impact properties for the next generation advanced aerospace composite structures.
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Wolf, Caroline. "Multi-scale modelling of structure and mass transfer relationships in nano- and micro-composites for food packaging." Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20217/document.
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Malgré l'intérêt croissant que représente dans le domaine de l'emballage alimentaire la conception raisonnée de structures composites aux propriétés de transfert contrôlées, la compréhension des transferts de gaz et de vapeurs avec l'ajout de particules dans des polymères reste complexe. En vue d'apporter un nouvel éclairage à ce verrou scientifique, les travaux de thèse se sont focalisés sur les trois parties suivantes : - contribuer à une meilleure compréhension des transferts de matière dans les composites. Pour ce faire, une analyse exhaustive des données expérimentales de transfert de gaz et de vapeurs disponibles dans la littérature a été menée pour les nano- et micro-composites et une comparaison de ces données a été réalisée avec des modèles de tortuosité, basés sur des paramètres géométriques ; - comprendre et modéliser la perméabilité dans des composites avec deux phases perméables. Pour cela, les transferts de vapeur d'eau dans un composite (fibre de paille/bio-polyester) chargé avec des particules perméables ont été mesurés et décrits en détail, et une comparaison de ces données avec des modèles analytiques issus d'autres champs disciplinaires, prenant en compte la perméabilité dans la particule et dans la matrice, a été menée. Cette étude a mis en avant le manque de modèles adaptés pour la prédiction de la perméabilité dans les composites contenant des particules perméables ; - développer une nouvelle approche multi-échelle pour la prédiction de la perméabilité dans des composites prenant en compte les propriétés de transfert dans les particules et dans la matrice polymérique avec une représentation 2D de la structure du composite. Afin d'atteindre un niveau satisfaisant de validation du modèle, la détermination des paramètres expérimentaux tels que la diffusion dans les particules doit être améliorée. Cette nouvelle approche de modélisation ouvre la voie à la création d'outils d'ingénierie inverse pour le design de structures composites, ajustés aux besoins des aliments en termes de propriétés barrièresDespite the global growing interest in the food packaging field for the design of tailored composite structures with controlled mass transfer properties, the understanding of the modulation of the mass transfer properties with the incorporation of particles in polymer still remains very complex. In order to throw light on this scientific problem, the thesis work was focused on the following parts: - providing a better understanding of mass transfer in composites. In this purpose an analysis of all experimental gas and vapour permeability data available in the literature has been carried out in nano- and micro- composites and a comparison of these data with predictions from tortuosity models based on few geometrical inputs has been achieved; - performing a detailed study of water vapour mass transfer in composites (wheat straw fibres/bio-polyester). These data were compared with the prediction of bi-phasic analytical models coming from other disciplinary fields. This part of the work has highlighted the lack of comprehensive and complete models for the prediction of permeability in composite with permeable particles; - developing of an innovative multi-scale approach for the prediction of mass transfer in bi-phasic composites considering both the particle and the polymer matrix properties with realistic 2D geometry of the composite structures has been proposed. For the sake of reaching a satisfactory validation level of the model, some experimental improvements are still needed to increase the accuracy of input parameters such as diffusivity of the particles.This new modelling approach open the way for the creation of a reverse-engineering toolbox for the design of tailor made composites structures, tightly adjusted to barrier properties requirements of the packed food
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Gu, Tang. "Modélisation multi-échelles du comportement électrique et élasto-plastique de fils composites Cu-Nb nanostructurés et architecturés." Thesis, Paris, ENSAM, 2017. http://www.theses.fr/2017ENAM0017/document.
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Les fils composites nanostructurés et architecturés cuivre-niobium sont de candidats excellents pour la génération de champs magnétiques intenses (>90T); en effet, ces fils allient une limite élastique élevée et une excellente conductivité électrique. Les fils Cu-Nb multi-échelles sont fabriqués par étirage et empaquetage cumulatif (une technique de déformation plastique sévère), conduisant à une microstructure multi-échelle, architecturée et nanostructurée présentant une texture cristallographique de fibres forte et des formes de grains allongées le long de l'axe du fil. Cette thèse présente une étude compréhensive du comportement électrique et élasto-plastique de ce matériau composite, elle est divisée en trois parties: modélisation multi-échelle électrique, élastique et élasto-plastique. Afin d'étudier le lien entre le comportement effective et la microstructure du fil, plusieurs méthodes d'homogénéisation sont appliquées, qui peuvent être séparées en deux types principaux: la méthode en champs moyens et en champs complets. Comme les spécimens présentent plusieurs échelles caractéristiques, plusieurs étapes de transition d'échelle sont effectuées itérativement de l'échelle de grain à la macro-échelle. L'accord général parmi les réponses de modèle permet de suggérer la meilleure stratégie pour estimer de manière fiable le comportement électrique et élasto-plastique des fils Cu-Nb et économiser le temps de calcul. Enfin, les modèles électriques prouvent bien prédire les données expérimentales anisotopique. De plus, les modèles mécaniques sont aussi validés par les données expérimentales ex-situ et in-situ de diffraction des rayons X/neutrons avec un bon accordNanostructured and architectured copper niobium composite wires are excellent candidates for the generation of intense pulsed magnetic fields (>90T) as they combine both high strength and high electrical conductivity. Multi-scaled Cu-Nb wires are fabricated by accumulative drawing and bundling (a severe plastic deformation technique), leading to a multiscale, architectured and nanostructured microstructure exhibiting a strong fiber crystallographic texture and elongated grain shapes along the wire axis. This thesis presents a comprehensive study of the effective electrical and elasto-plastic behavior of this composite material. It is divided into three parts: electrical, elastic and elasto-plastic multiscale modeling. In order to investigate the link between the effective material behavior and the wire microstructure, several homogenization methods are applied which can be separated into two main types: mean-field and full-field theories. As the specimens exhibit many characteristic scales, several scale transition steps are carried out iteratively from the grain scale to the macro-scale. The general agreement among the model responses allows suggesting the best strategy to estimate reliably the effective electrical and elasto-plastic behavior of Cu-Nb wires and save computational time. The electrical models are demonstrated to predict accurately the anisotropic experimental data. Moreover, the mechanical models are also validated by the available ex-situ and in-situ X-ray/neutron diffraction experimental data with a good agreement
Book chapters on the topic "Multi-scale Hybrid composite"
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Ye, Fan, Dayuan Jin, Yun Wan, and Xiong Jiang. "Concurrent Multi-scale Design of Hybrid Composite Antenna." In Proceedings of the Eighth Asia International Symposium on Mechatronics, 463–71. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1309-9_48.
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McAllister, Quinn P., John W. Gillespie, and Mark R. VanLandingham. "Experimental Measurement of the Energy Dissipative Mechanisms of the Kevlar Micro-fibrillar Network for Multi-scale Application." In Experimental Mechanics of Composite, Hybrid, and Multifunctional Materials, Volume 6, 57–63. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00873-8_8.
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Li, Li, and Mingli Cao. "A new multi-scale hybrid fibre reinforced cement-based composites." In fib Bulletin 95. Fibre Reinforced Concrete: From Design to Structural Applications, 12–19. fib. The International Federation for Structural Concrete, 2020. http://dx.doi.org/10.35789/fib.bull.0095.ch02.
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Jain, Atul. "Hybrid multiscale modelling of fatigue and damage in short fibre reinforced composites." In Multi-Scale Continuum Mechanics Modelling of Fibre-Reinforced Polymer Composites, 691–720. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-818984-9.00023-8.
Full textConference papers on the topic "Multi-scale Hybrid composite"
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DUMON, ALEXANDRE, SEBASTIAN MUELLER, PATRICK DE LUCA, and ALAIN TRAMECON. "Multi-Scale Analysis of Joints in Hybrid Metal/Composite Structures in ESI Virtual Performance Solution (VPS)." In American Society for Composites 2018. Lancaster, PA: DEStech Publications, Inc., 2018. http://dx.doi.org/10.12783/asc33/25982.
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Marashizadeh, Parisa, Mohammad Abshirini, Mrinal Saha, and Yingtao Liu. "Numerical Interlaminar Shear Damage Analysis of Fiber Reinforced Composites Improved by ZnO Nanowires." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23422.
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Abstract In this study, the damage analysis of hybrid carbon fiber reinforced polymer (CFRP) composited with vertically aligned zinc oxide (ZnO) nanowires is investigated numerically. The effect of growing nanowires on improving the interlaminar shear strength (ILSS) of the hybrid structures is explored. The multi-scale model developed to make a bridge between the materials with different length scales available in the hybrid structures, including micro-scale, meso-scale, and macros-scale. The vertically aligned ZnO nanowires on the lamina and embedded in the epoxy matrix creates an enhancement layer. The effective material properties of this layer are evaluated at micro-scale by homogenization analysis. The cohesive zone method is employed in the meso-scale to explore the interfacial behavior and delamination (interlaminar damage) between the homogenized stacking layer and the CFRP lamina. Besides, the strain-based failure criterion is implemented at the macro-scale to investigate the progressive damage of fiber and matrix in CFRP plies. This analysis is programmed in user-defined subroutine linked to ABAQUS finite element software. The three-dimensional hybrid composite short beam in the three-point bending load is simulated in ABAQUS Explicit packager, and the ILSS is obtained. The damage behavior of hybrid composite is compared to the bare CFRP beam. The results indicate that aligning nanowires on the plies improves the performance of CFRP composites.
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Viviane C. Munhoz, Aline M. Oliveira, Elvis C. Monteiro, and Antônio F. Ávila. "Multi-Scale Experimental Analysis of Hybrid Carbon/CNT+Graphene Composites." In 23rd ABCM International Congress of Mechanical Engineering. Rio de Janeiro, Brazil: ABCM Brazilian Society of Mechanical Sciences and Engineering, 2015. http://dx.doi.org/10.20906/cps/cob-2015-1873.
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Edmans, Ben, Dinh Chi Pham, Zhiqian Zhang, Tianfu Guo, Sridhar Narayanaswamy, and Graham Stewart. "Multiscale Finite Element Analysis of Unbonded Flexible Risers." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24454.
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Unbonded flexible risers are a key technology in existing and proposed offshore developments. With increasing water depth, the demands on risers increase and the design against hydrostatic and tension loads becomes more of a challenge. In addition, many existing subsea production systems are approaching the end of their design life and operators need to know if they can remain in-service. To enable the benefits from deepwater production and life extension projects to be realized while minimizing risks to life, property and the environment, accurate modelling and analysis tools are required to improve the prediction of failure modes and to develop a better understanding of the conditions leading to progressive failure. In this work, a multi-scale approach is adopted whereby a global dynamic analysis model is employed to determine the overall displacements of the riser and this is linked with a local model that can provide accurate forces and stresses for the prediction of collapse, fatigue damage and buckling of tensile armour wires. Firstly, we describe a nonlinear constitutive model for use in large-scale dynamic analysis of flexible risers based on an analytical homogenization of composite cylinders using the analogy between slip between pipe layers and plastic flow in continua. The model is able to reproduce the bending hysteresis behaviour observed in flexible pipes and its dependence on internal and external pressure. Secondly, we show a procedure for obtaining equivalent material parameters for this model from finite element local analyses of a flexible pipe. Finally, we show the implementation of this constitutive model in a riser system using two-dimensional co-rotational hybrid beam finite elements.
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Heinze, Torsten, Lars Panning-von Scheidt, Jörg Wallaschek, and Andreas Hartung. "Rotational Speed-Dependent Contact Formulation for Nonlinear Blade Dynamics Prediction." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75290.
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Considering rotational speed-dependent stiffness for vibrational analysis of friction-damped bladed disk models has proven to lead to significant improvements in nonlinear frequency response curve computations. The accuracy of the result is driven by a suitable choice of reduction bases. Multi-model reduction combines various bases which are valid for different parameter values. This composition reduces the solution error drastically. The resulting set of equations is typically solved by means of the harmonic balance method. Nonlinear forces are regularized by a Lagrangian approach embedded in an alternating frequency/time domain method providing the Fourier coefficients for the frequency domain solution. The aim of this paper is to expand the multi-model approach to address rotational speed-dependent contact situations. Various reduction bases derived from composing Craig-Bampton, Rubin-Martinez, and hybrid interface methods will be investigated with respect to their applicability to capture the changing contact situation correctly. The methods validity is examined based on small academic examples as well as large-scale industrial blade models. Coherent results show that the multi-model composition works successfully, even if multiple different reduction bases are used per sample point of variable rotational speed. This is an important issue in case that a contact situation for a specific value of the speed is uncertain forcing the algorithm to automatically choose a suitable basis. Additionally, the randomized singular value decomposition is applied to rapidly extract an appropriate multi-model basis. This approach improves the computational performance by orders of magnitude compared to the standard singular value decomposition, while preserving the ability to provide a best rank approximation.
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Griffin, Dayton A., and Thomas D. Ashwill. "Alternative Composite Materials for Megawatt-Scale Wind Turbine Blades: Design Considerations and Recommended Testing." In ASME 2003 Wind Energy Symposium. ASMEDC, 2003. http://dx.doi.org/10.1115/wind2003-696.
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As part of the U.S. Department of Energy’s Wind Partnerships for Advanced Component Technologies program, Global Energy Concepts LLC (GEC) is performing a study concerning blades for wind turbines in the multi-megawatt range. Earlier in this project constraints were identified to cost-effective scaling-up of the current commercial blade designs and manufacturing methods, and candidate innovations in composite materials, manufacturing processes and structural configurations were assessed. In the present work, preliminary structural designs are developed for hybrid carbon fiber/fiberglass blades at system ratings of 3.0 and 5.0 megawatts. Structural performance is evaluated for various arrangements of the carbon blade spar. Critical performance aspects of the carbon material and blade structure are discussed. To address the technical uncertainties identified, recommendations are made for new testing of composite coupons and blade sub-structure.