Relevant bibliographies by topics / Micro composite

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Micro composite'

Author: Grafiati
Published: 4 June 2021
Last updated: 17 February 2022

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Journal articles on the topic "Micro composite"

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Senthilkumar, R., N. Arunkumar, and M. Manzoor Hussian. "Effects of Micro and Nano-Size Al2O3 Particle Reinforcement on Mechanical Behaviour of Extruded Aluminum Alloy Matrix Composite." Applied Mechanics and Materials 787 (August 2015): 617–21. http://dx.doi.org/10.4028/www.scientific.net/amm.787.617.

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Aluminum alloy (AA2014) matrix composites reinforced by different weight percentage of aluminum oxide (Al2O3) in micro and nano sizes were fabricated through powder metallurgy route followed by hot extrusion process. Seven different aluminium composites with varying percentages of nano and micron sized alumina particles varying from 1% to 10% were evaluated in addition to monolithic alloy. The microstructure of nano-composite and monolithic alloys were examined by optical microscope and scanning electron microscope (SEM) equipped with an energy dispersive X-ray analysis (EDAX). In addition, the effects of weight fraction of the reinforcement matrix on mechanical properties were evaluated. The results have indicated that, a significant improvement in hardness of the nano composite was found in case of nano-composite with 8% of micro Al2O3 and 2% of nano Al2O3 particles by the addition of reinforcement.
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Senthilkumar, R., N. Arunkumar, M. Manzoor Hussian, and R. Vijayaraj. "Study of Microstructure and Mechanical Properties of Sintered Aluminum Alloy Composite Reinforced with Al2O3 Nanoparticles." Advanced Materials Research 849 (November 2013): 62–68. http://dx.doi.org/10.4028/www.scientific.net/amr.849.62.

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In this research, aluminum alloy AA2014 matrix composites reinforced with micron (10% wt 5% wt) and nanoparticles (1% wt 5% wt) of Al2O3were fabricated through powder metallurgy method. Optimum amount of reinforcement were determined by evaluating mechanical properties like micro-hardness and compressive strength of composites. The composite samples were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results reveal that the composites containing 2% wt of nanoAl2O3and 8 % micro Al2O3reinforcement has homogenous microstructure as well as superior mechanical properties.
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Chen, L., R. Ballarini, H. Kahn, and A. H. Heuer. "Bioinspired micro-composite structure." Journal of Materials Research 22, no. 1 (January 2007): 124–31. http://dx.doi.org/10.1557/jmr.2007.0016.

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This paper presents the design, fabrication, and mechanical testing of a bioinspired composite structure with characteristic dimensions on the order of tens of microns. The microarchitecture, designed and fabricated using microelectromechanical systems (MEMS) technology, involves two distinct length scales and represents the first attempt at mimicking the crossed-lamellar microstructure of molluscan shells such as the giant Queen conch, Strombus gigas, which contains features with dimensions spanning five distinct length scales. The displacement control capabilities of a nanoindenter enabled the observation of the graceful failure of the micro-composite under three point bending and, in turn, the measurement of its post-peak load–displacement response and work of fracture.
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Lan, Xin, Weimin Huang, and Jinsong Leng. "Shape Memory Effect in Micro-Sized Shape Memory Polymer Composite Chains." Applied Sciences 9, no. 14 (July 22, 2019): 2919. http://dx.doi.org/10.3390/app9142919.

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Since the shape memory effect (SME) has been confirmed in micron and submicron sized polyurethane (PU) shape memory polymer (SMP), it might be used in novel micro/nano devices even for surgery/operation inside a single cell. In this study, micron sized protrusive PU SMP composite chains are fabricated via mixing ferromagnetic nickel micro powders with PU SMP/dimethylformamide solution and then cured under a low magnetic field. Depending on the amount of nickel content, vertical protrusive chains with a diameter from 10 to 250 µm and height from 200 to 1500 µm are obtained. The SME in these chains is investigated to confirm the SME in SMP composites at microscale. An array of such protrusive chains may be utilized to obtain re-configurable surface patterns in a simple manner for applications, such as remarkable change in wetting and friction ability. Finally, its potential applications for micro electro mechanical systems (MEMS) and biomedical device are proposed.
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Li, Duo Sheng, X. L. Zhou, A. H. Zou, X. Z. Hua, G. Z. Ye, and Q. J. Chen. "Study on Micro-Deformation Behavior of Sicp/Al Composites at Low Stress." Advanced Materials Research 426 (January 2012): 147–50. http://dx.doi.org/10.4028/www.scientific.net/amr.426.147.

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In this paper, SiCp/Al composites were fabricated by spontaneous infiltration technology. The micro-deformation behavior (MDB) of low tress in some silicon carbide particulate reinforced aluminum composites (SiCp/Al composites) was investigated experimentally. The microstructure, micro-deformation of samples was analyzed by OM and WDW-50 respectively. The results show that, in aluminum matrix with incorporating SiCp, the distribution of SiCp was uniform. In the same other conditions, SiCp size of the composite plays an important role on MDB at low stress, and the micro-deformation performance of the SiCp/Al composite increases with decreasing of SiCp size. MDB of composites at low stress deeply depends on the matrix material, and MDB increases with increasing of the matrix strength. It was also found that, the micro-deformation of SiCp/Al composite was negative value in the early stages of low tensile stress, and the phenomenon can be explained by strain relaxation.
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Senthilkumar, R., N. Arunkumar, M. Manzoor Hussian, and R. Vijayaraj. "Studies on Mechanical Properties and Microstructure of Al2O3 Reinforced AA5083 Matrix Composite ." Applied Mechanics and Materials 592-594 (July 2014): 749–54. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.749.

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The expectations over novel composite materials have been increased especially in automotive and aerospace applications due to its superior weight to strength ratio and tailored mechanical properties. In this frame work, aluminum alloy AA5083 alloy matrix reinforced with micron (10% wt – 5% wt) and nanoparticles (1% wt – 5% wt) of Al2O3.The composite samples were fabricated through powder metallurgy route. Optimum amount of reinforcement were determined by evaluating mechanical properties like micro-hardness and compressive strength of composites. The characterizations were probed by Scanning Electron Microscope (SEM) and X-ray Diffraction (XRD) methods. The results reveal that the composites containing 2% wt of nanoAl2O3and 8 % micro Al2O3reinforcement witnessed superior mechanical properties due to its combined effect of concentration and particulate scale and the great isotropic behavior was achieved by homogenous dispersion of reinforcement in the matrix phase.
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Sukhavattanakul, Pongpat, Lerpong Jarupan, and Chiravoot Pechyen. "Structures and Properties of Isotactic-Polypropylene/Synthesized Micro Cellulose Tray: Effects of Micro Cellulose Loading." Advanced Materials Research 626 (December 2012): 716–20. http://dx.doi.org/10.4028/www.scientific.net/amr.626.716.

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Cellulose was derived from cotton fabric waste. Composites of microcellulose fibers (MC) and isotactic polypropylene (i-PP) was prepared by melting and mixing, and maleic anhydride grafted polypropylene (MA-g-PP) was used as compatibilizer. The MC was blended in different ratios up to 20 phr with i-PP using corotating twin-screw compounder and then a forming of trays was done by injection molding. Effects of MC on mechanical properties of i-PP were investigated. Changes in mechanical and morphological properties with different MC loading were discussed. The composite of i-PP/MA-g-PP/MC rendered better results in comparison with the i-PP/MC composite. The compressive strength and modulus of i-PP/MC composites increased with the addition of 20 phr MC. The i-PP/MA-g-PP/MC-20phr composites showed higher compressive strength and modulus than the i-PP/MC-20 phr without MA-g-PP due to increased interfacial interaction between MC and i-PP matrix. Thermal properties of i-PP/MC composites with and without MA-g-PP were not significantly different from pure i-PP. In conclusion, MC derived from cotton fabric waste could be used as a reinforcing agent for manufacturing thermoplastic.
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Hu, Haitao, Xiaohong Zhang, Dingping Zhang, Junguo Gao, Chunxiu Hu, and Yayun Wang. "Study on the Nonlinear Conductivity of SiC/ZnO/Epoxy Resin Micro- and Nanocomposite Materials." Materials 12, no. 5 (March 5, 2019): 761. http://dx.doi.org/10.3390/ma12050761.

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To investigate the inhomogeneous distribution of electric fields in insulating equipment and components, five nonlinear-conductance composite materials based on epoxy resin (EP) (nano-SiC/EP, nano-ZnO/EP, micro-ZnO/EP, nano-SiC/ZnO/EP, and nano-micro-SiC/ZnO/EP), were prepared using nano-SiC, nano-ZnO, and micro-ZnO particles as fillers. The mass fractions of the inorganic fillers were 1, 3, and 5 wt%, respectively. The direct current (DC) voltage characteristics of the composites showed that the electrical conductivities and nonlinear coefficients of the composites utilizing single-filler types increased with increasing inorganic filler content. Under the same conditions, the conductivity and nonlinear coefficient of SiC/EP were both larger than those of the nano-ZnO/EP and micro-ZnO/EP. However, the nonlinear coefficient of the composites was significantly affected by the simultaneous addition of the two inorganic fillers, micro-ZnO and nano-SiC. When the content ratio of micro-ZnO to nano-SiC was 2:3, the nonlinear coefficient of the composite reached a maximum value of 3.506, significantly higher than those of the other samples. Compared with the nano-SiC/EP, micro-ZnO/EP and nano-ZnO/EP composites with 5 wt% inorganic filler, the nonlinear coefficient of the two-filler composite was greater by a factor of 0.82, 2.48, and 5.01, respectively.
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Rajasekhar, Reshma, Baby James, Minimol K. Johny, and Jose Jacob. "Evaluation of the effect of two commercially available non-alcoholic mouth rinses on the microhardness of composite material - An invitro study." Current Dental Research Journal 1, Issue 1 (May 30, 2019): 14–21. http://dx.doi.org/10.12944/cdrj.01.o1.03.

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Composites have been widely used for anterior as well as posterior restorations due to increased aesthetic demands. Composite restorations placed in patients oral cavity is subjected to masticatory load, pH changes and chemical effect due to mouthwashes, beverages, food etc and the detrimental effects associated with these challenges on the microhardness of composite has to be determined. The study was conducted to evaluate the effect of two commercially available non-alcoholic mouth rinses on the microhardness of micro-hybrid and nanohybrid composite resins. Forty disc-shaped composite specimens were made from each type of composite materials and were divided into 5 groups with 8 samples each, Group 1= Microhybrid+Chlorhex, Group2=Microhybrid + Hexidine, Group3= Nanohybrid + Chlorhex, Group4= Nanohybrid+ Hexidine, Group 5= Nanohybrid and Micro hybrid + artificial saliva(Control).The samples were immersed in mouthrinses for 24 hrs and microhardness was subsequently measured using a Vicker’s microhardness tester. There was no significant difference in microhardness values of tested composite resins in either mouth rinses when compared to composites immersed in artificial saliva. Non-alcoholic mouth rinses do not affect the microhardness of micro-hybrid and nanohybrid composites.
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Wang, Zhen Ting, and Hua Hui Chen. "Study on the Wear Resistance of Micro-Nanostructured WC Composite Coating Sintered by Induced Heating." Key Engineering Materials 280-283 (February 2007): 1489–92. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.1489.

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Micro-nanostructured WC composite coatings were successfully fabricated by induced heating sintering method on the surface of Q235 steel .The microstructure, micro-hardness and the wear resistance of the composite coatings were studied .The results show that the microstructure of induced heat layer is mainly composed of Ni-based solid solutions and WC particles. And there exists excellent metallurgical bonding between coating and substrate. The wear resistance of micro-nanostructured WC Composite Coatings is increased by 1.5 times on an average as compared with that of micron.
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Dissertations / Theses on the topic "Micro composite"

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CHEN, LI. "A BIOINSPIRED MICRO-COMPOSITE STRUCTURE." Case Western Reserve University School of Graduate Studies / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=case1118471877.

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Peditto, Francesca Priola Aldo Gérard Jean-François. "Photopolymerized micro-and nano-composites interface chemistry and its role on interfacial adhesion /." Villeurbanne : Doc'INSA, 2005. http://docinsa.insa-lyon.fr/these/pont.php?id=peditto.

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Peng, Suili. "Nano/micro particle-based functional composites and applications /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?NSNT%202007%20PENG.

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Bailey, Stephen Peter. "Design, fabrication and characterisation of functional cement-composite micro-devices." Thesis, Birkbeck (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401238.

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Zhao, Hang. "Comportement multifonctionnel des composites comportant des nano/micro renforts." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLC020/document.

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En raison de leurs propriétés mécaniques, électriques et thermiques exceptionnelles, les nanotubes de carbone (NTC) ont reçu une importante attention mondiale. Les NTC ont un grand potentiel dans différents domaines d'applications tels que le stockage d'énergie et la microélectronique. Grâce à leur structure unidimensionnelle, leur important facteur d'aspect et leur faible densité, les NTC servent comme charges dans les composites. Par contre, en raison des fortes interactions entre eux, il est difficile de les disperser et de les aligner dans une matrice de polymère.Il est connu qu'une bonne conception d'hybrides, constitués de NTC verticalement lignés sur des substrats, améliore de manière significative la dispersion de ces derniers dans la matrice. Ces hybrides sont préparés par le procédé de dépôt chimique en phase vapeur (CVD). Une fois, ces hybrides sont dispersés dans la matrice du composite cela conduit à une nette amélioration des propriétés multifonctionnelles de ce composite. Les substrats utilisés dans cette thèse sont les nanoplaquettes de graphite (NPG) pour donner des hybrides NPG-NTC que nous appellerons par la suite GCHs. Les GCHs ont l'avantage d'avoir une faible densité et une structure totalement conductrice qui améliore les propriétés diélectriques et électriques des composites.Dans l'état de l'art, les relations entre l'organisation des GCHs et les conditions de synthèse par CVD et entre l'ajout des GCHs dans les composites et les réseaux conducteur interne dans les composites n'ont jamais été étudiées. Pour cela, dans cette thèse, nous allons soigneusement étudier et discuter ces problèmes mentionnés.Dans le premier chapitre, nous présentons une revue générale de la structure, des propriétés, des applications et de la synthèse des NTC et des NPG. Nous présentons aussi les procédures de l'intégration des nanoparticules dans des matrices polymères et les méthodes de fonctionnalisation des NTC. Nous discutons aussi des états électriques et les caractéristiques (di)électriques des composites en fonction de la quantité de la charge conductrice.Le deuxième chapitre présente tout d'abord la synthèse des NTC sur les NPG par CVD. Ensuite, l'influence des paramètres de la CVD, la température, la composition du gaz et le temps de la réaction, ont été étudié. Les résultats qualitatifs et quantitatifs obtenus d'après les caractérisations des ces hybrides peuvent servir comme base de données pour l'intégration et l'influence des ces hybrides dans les composites.Le troisième chapitre présente les composites binaires polyvinylidene fluoride/GCHs et leurs propriétés diélectriques qui sont nettement améliorées par rapport aux composites ternaires composés de polyvinylidene fluoride/NPG/NTC. Les composites obtenus par dispersion des GCHs dans la matrice à l'aide du procédé d'extrusion-injection, présentent un seuil de percolation fortement réduit (5,53 vol%) et une stabilité thermique relativement élevée. Leurs propriétés diélectriques améliorées peuvent être attribuées à des réseaux sous forme de micro-condensateurs et le changement de la cristallinité de la matrice peut être attribué à la bonne conception des hybrides.Le quatrième chapitre étudie les composites GCHs/polydiméthylsiloxane (PDMS) avec la haute performance piézo-résistive dans une large gamme de température. Le composite présente un seuil de percolation ultra-bas et une grande sensibilité piézo-résistive. En particulier, les autres améliorations des propriétés électriques obtenues dans les composites GCHs/PDMS par rapport à celles des composites à base de NTC/PDMS, de NPG/PDMS ou encore de NTC-NPG/PDMS. Les légers mouvements des doigts peuvent être détectés grâce à l'usage de ces films composites en tant que capteurs de mouvement
Due to the outstanding mechanical electrical and thermal properties, carbon nanotubes (CNTs) received worldwide attentions and intensive investigations in last decades. CNTs are greatly potential in applications such as energy storage and microelectronics. The one dimensional structure, high aspect ratio and low density, promote CNTs serving as the excellent fillers in composites field. However, due to the strong interactions, CNTs are usually difficult to be dispersed and aligned in a polymer matrix. Designing the CNTs construction reasonably is an effective way to ameliorate the dispersion states of CNTs in matrix. These specific hybrid constructions allowed CNTs arrays synthesized vertically onto the substrates through catalyst chemical vapor deposition method. These CNT arrays effectively overcome the problem of CNTs aggregation and promote the interconnection among CNTs, leading to a considerable improvement of multi-functional properties of composites. Graphite nanoplatelets (GNPs) served as substrate make their synthesizing products-GNP-CNTs hybrids (GCHs) possess distinct merits of all-carbon composition, totally-conductive coupling structure and the low intrinsic density. These GCHs constructions provide a great improvement in the dielectric and electrical properties of composites. However, the relationship between GCHs organization and synthesizing conditions during CVD process and the influence of the addition of GCHs to internal conductive networks have not been reported in detail. These mentioned issues will be investigated and discussed in this thesis, which is divided into four chapters:The first chapter makes a general review of the structure, properties, application and synthesis of CNTs and GNP substrates, and the main procedures of fabricating composites and surface functionalization of CNTs. Moreover, a short introduction of the development of micro-nano hybrids applied to the functional composites is made. Most importantly, the developing electrical states and (di) electrical characteristics of composites with ever-increasing conducting filler loading are reviewed in detail at the last part.The second chapter discusses firstly the synthesis process through the CCVD approach and the relationship between CVD parameters and the corresponding construction of GCHs, where the temperature, gas composition and reaction time were controlled. The constructions CNT arrays are dependent on the synthesis conditions. Furthermore, the results obtained from analysis can provide a structural foundation for the huge application potential of GCHs constructions. The third chapter introduces the poly(vinylidene fluoride)-based nanocomposites containing GCH particles, the dielectric properties of which are improved more greatly than the ternary composites loading equivalent mixture of GNPs and CNTs. The composites achieved by dispersing GCH particles into matrix using the mechanical melt-mixing process, showing a strongly reduced percolation threshold (5.53 vol %) and the relatively high thermal stability. Their improved dielectric properties can be attributed to the formed microcapacitor networks and the change of crystalline formation of matrix, caused by well-designed CNT arrays constructions. The fourth chapter investigates the advanced GCHs/ polydimethylsilicone (PDMS) composites with high piezo-resistive performance at wide temperature range. The synthesized GCHs can be well dispersed in the matrix through the mechanical blending process. The flexible composite shows an ultra-low percolation threshold (0.64 vol%) and high piezo-resistive sensitivity (gauge factor ~103 and pressure sensitivity ~ 0.6 kPa-1). Particularly, the much improvements of electrical properties achieved in GCHs/PDMS composites compared with composites filled with equivalent CNT, GNP or mixture of CNTs/GNPs. Slight motions of finger can be detected and distinguished accurately using the composites film as typical wearable sensor
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Tertrais, Hermine. "Développement d’un outil de simulation pour le chauffage de matériaux composites par micro-ondes." Thesis, Ecole centrale de Nantes, 2018. http://www.theses.fr/2018ECDN0061/document.

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Le travail présenté dans cette thèse s’inscrit dans le contexte du développement de nouveaux procédés pour la mise en forme de matériaux composites pour répondre aux contraintes industrielles de gain de temps et d’énergie. Le procédé de chauffage par micro-onde reposant sur un principe de chauffage volumique permet de garantir ces avantages. L’inconvénient majeur est que le comportement du champ électrique lors de l’interaction entre matériaux composites et micro-ondes est peu connu. L’objectif de cette thèse est donc de proposer des solutions numériques pour approfondir la connaissance du procédé et la physique associée afin de mettre en avant ses capacités quant à un développement industriel. Pour ce faire, le travail réalisé est axé autour de trois verrous. En premier lieu, une nouvelle méthode numérique est proposée afin de résoudre les équations de Maxwell en 3D dans un stratifié composite. Prendre en compte le comportement 3D est essentiel afin de décrire avec précision l’impact des différentes couches du matériau et de leur épaisseur sur la propagation du champ électrique. Dans un second temps, la simulation électromagnétique est couplée à une résolution thermique afin de simuler le procédé de chauffage d’une pièce composite. Différents paramètres du procédé sont étudiés afin de mettre en avant les plus sensibles pour l’utilisation du chauffage micro-onde pour les matériaux composites. Enfin, l’attention du lecteur est portée sur le développement d’une méthode de simulation pour un contrôle en temps réel du procédé en comparaison avec des essais expérimentaux
The context of the present work is the development of new processes for the heating and forming of composite materials in order to provide an answer to the industrials needs for less energy and less time-consuming processes. In that sense, microwave heating is perfect match as it relies on volumetric heating. The major drawback is that the behaviour of the electric field while interacting with composite material is poorly known. Therefore, the main objective of this thesis is to provide numerical solutions to go more deeply in the understanding of such process and put forward its capabilities for an industrial development.To fulfil this objective, the work is oriented over three main axes. First, an innovative simulation tool is presented in order to solve the Maxwell’s equations in a thin multi layered domain. Taking into account the 3D behaviour of the electric field is a major issue in order to describe precisely the impact of the different plies of the laminate on the propagation of the electric field.Then, the electromagnetic simulation is coupled with a thermal simulation in order to simulate the full heating process of a composite part. Parameters of the process are investigated to bring forward the most crucialones. Finally, real-time control of the process is tackled using a model order reduction simulation technique. These results are compared to experimental work on two sets of samples
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Peters, Sarah June. "Fracture Toughness Investigations of Micro and Nano Cellulose Fiber Reinforced Ultra High Performance Concrete." Fogler Library, University of Maine, 2009. http://www.library.umaine.edu/theses/pdf/PetersSJ2009.pdf.

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Graham, Samuel Jr. "Effective thermal condutivity of damaged composites." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/16935.

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Ben, ghzaiel Tayssir. "Synthèse, caractérisation et étude des propriétés magnétiques et diélectriques de nanocomposites Polyaniline/hexaferrite pour l'absorption des micro-ondes." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLN003/document.

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Ces travaux de thèse consistent à élaborer des nanocomposites Polyaniline/hexaferrite pour l’absorption des micro-ondes. L’idée principale est la mise en œuvre de matériaux composites à base de polymères conducteurs intrinsèques telle la Polyaniline que nous avons dopée avec différents types d’acides (HCl, CSA, NSA et TSA…) et l’hexaferrite de baryum de type magnétoplombite (M) stœchiométrique ou substitué. Au niveau de l’hexaferrite de baryum, la substitution du Fe3+ s’est faite par les ions Al3+, Bi3+, Cr3+ et Mn3+.L’hexaferrite de baryum et les hexaferrites substitués par les différents ions cités ci-dessus ont été synthétisés par voie hydrothermale dynamique en faisant varier divers paramètres au cours de la synthèse (pH, température, temps, rapport [OH-]/[NO3-]…).L’élaboration des composites Polyaniline/hexaferrite (pur ou substitués) a été effectuée par polymérisation oxydative en utilisant plusieurs techniques de synthèse : la polymérisation chimique en solution (en tenant compte de la nature de l’acide utilisé) avec ou sans agitation (Aqueous-Based Polymerization with or without stirring) et la polymérisation oxydative par voie solide (Solid-Based Polymerization). L’optimisation de ces différentes techniques de synthèse après caractérisations physicochimiques (DRX, FTIR, ATG, MEB, EDX), diélectriques (ε’, ε’’, σdc) et magnétiques (Mr, Ms, Hc, Tc, µ’, µ’’) des échantillons, a montré que la polymérisation par voie solide se trouve la méthode la plus facile, économique et respectueuse de l’environnement. Elle est aussi adaptée à la production du composite Pani/BaFe12O19 avec de bonnes propriétés structurales, physiques et magnétiques. L’étude de la substitution du Fe3+ dans le BaFe12O19 par Al3+, Bi3+, Cr3+ et Mn3+ a montré une forte dépendance des propriétés structurales et magnétiques avec la distribution de ces ions dans la maille cristalline hexagonale. En effet, les ions Al3+, Cr3+ et Mn3+ ont une tendance à occuper les sites tétraédriques, alors que le Bi3+ occupe les sites octaédriques. Une augmentation de Hc associée à la taille des cristallites a été observée pour les particules substituées avec l'Al et le Cr alors qu’une modification de l'anisotropie magnetocristalline (fort terme d'ordre supérieur) a été mise en évidence pour les substitutions Bi et Mn, dû à leur grand rayon ionique. L’incorporation des hexaferrites substitués dans la Polyaniline pour obtenir des composites Pani/BaMeFe11O19, où Me = Al, Bi, Cr et Mn, révèle une variation des propriétés électromagnétiques dans la gamme de fréquences allant de 1 à 18 GHz. En effet, ces variations sont dues à la formation de dipôles entre l’ion de substitution et les cations O2- dans le ferrite qui sont responsables de la résonance ferromagnétique, de l'anisotropie magnétocristalline et des interactions avec la matrice polymérique. Le composite Pani/BaFe12O19 présente des absorptions dans la bande X qui se déplacent vers la bande Ku avec la substitution du fer confirmant
This thesis deals with the formulation of Polyaniline/hexaferrite nanocomposite for absorbing electromagnetic waves. The main idea is the process of composite materials based on polymers intrinsic conductors such as polyaniline that we doped with different types of acids (HCl, CSA, NSA, and ... TSA) and barium hexaferrite with magnetoplumbite structure with or without substitution according to desired stoichiometries. In the barium hexaferrite, the substitution of Fe 3+ is made by Al3+, Bi3+, Cr3+ and Mn3+ ions.The barium hexaferrite and its substitutions by different ions mentioned above were synthesized dynamic hydrothermal method by varying various parameters during the synthesis (pH, temperature, time, ratio [OH-]/[NO3-] ...).The elaboration of polyaniline/hexaferrite composite (pure or substituted) was carried out by oxidative polymerization using various synthesis techniques: Aqueous-Based Polymerisation with or without agitation (taking into account the nature of the acid used) (ABP) and Solid-Based Polymerization (SBP). The optimization of these various synthesis techniques after physicochemical (XRD, FTIR, TGA, SEM, EDX), dielectric (ε ', ε' ', σdc) and magnetic (Mr, Ms, Hc, Tc, µ', µ'') characterizations of the samples showed that the solid route is the easiest method, economical and environmentally friendly. It is also suitable for the production of composite Pani/BaFe12O19 with good structural, physical and magnetic properties.The study of the substitution of Fe 3+ in the BaFe12O19 by Al3+, Bi3+, Cr3+ and Mn3+ showed a strong dependence of the structural and magnetic properties with the distribution of these ions in the hexagonal crystal lattice. In fact, Al3+, Cr3+ and Mn3+ ions tend to occupy the tetrahedral sites, while the Bi3+ favoured the octahedral sites. An increase in Hc associated with the small crystallite size observed for particles substituted with Al and Cr and the enhancement magnetocristalline anisotropy (strong higher order term) for Bi and Mn due to their high ionic radius.The incorporation of the substituted hexaferrite in the polyaniline to obtain Pani/BaMeFe11O19 composite, where Me = Al, Bi, Cr and Mn, reveals a variation in electromagnetic properties in the frequency range from 1 to 18 GHz. In fact, these variations are due to the formation of dipoles between the substituting ion and surrounding O2- cations in the ferrite which are responsible for the ferromagnetic resonance, the magnetocrystalline anisotropy and the exchange interaction with the polymer. The composite Pani/BaFe12O19 shows absorption bands at the X-band that shift to the Ku-band with the substitution of iron, confirming the potential of these materials for microwave applications
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Naser, Hasan. "Développement de micro-composites architecturés en aciers inoxydables duplex : élaboration, microstructure et propriétés mécaniques." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI024/document.

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L'utilisation de l'acier inoxydable duplex (DSS) pour des applications structurales est considérée comme l'un des progrès les plus notables et qui a le plus grand impact sur le secteur de la construction. Ceci est grâce à ses propriétés mécaniques élevées couplées avec des propriétés fonctionnelles intéressantes telles que la résistance à la corrosion, ou encore la faible conductivité thermique par rapport aux aciers au carbone. En raison de sa microstructure et l'interaction complexe entre les phases, DSS a un fort potentiel pour le développement des propriétés uniques. Une meilleure compréhension est nécessaire pour obtenir des propriétés exceptionnelles et fournir la possibilité de concevoir un DSS sur-mesure et architecturé pour des applications spécifiques. Dans ce travail, nous avons proposé une approche différente de celle utilisée jusqu'à présent pour comprendre le comportement du DSS. La stratégie adoptée dans ce travail était une stratégie dite top-down dans laquelle au moins deux métaux ayant un comportement et des propriétés bien connues sont mécaniquement assemblés par déformation plastique sévère (SPD). Cette stratégie proposée a pour objectifs: i) améliorer les propriétés par raffinement de microstructure jusqu’à une échelle sub-micrométrique ii) l'élaboration d'un matériau modèle permettant de comprendre le comportement DSS obtenu par les méthodes métallurgique conventionnelles. Le premier objectif de ce travail était, par conséquent, la mise en œuvre d'une méthodologie de fabrication en utilisant la technique SPD par co-tréfilage. Cette technique permettra l'obtention d'une microstructure ultrafine des composites 316L / 430LNb. L'un des défis rencontrés au cours de notre étude était l'inter-diffusion significative lors de traitement thermique susceptible de limiter un raffinement supplémentaire de la microstructure en question. Une étude d'optimisation a été effectuée pour tenir compte du rôle de cette inter-diffusion pour un couple 316L / 430LNb. Ainsi, des micro-composites multi-échelles ont été obtenus. Dans ce travail, nous avons montré la limitation de ce processus en termes de raffinement de microstructure. Une rationalisation de ces limites a été donnée par une étude thermocinétiques sur les micro-composites et matériaux brut initialement utilisés. Parallèlement à l'évaluation de la microstructure, le comportement mécanique de ces nouveaux micro-composites a été examiné. Afin de fournir une explication plus approfondie sur le comportement plastique de nos composites, des essais de traction in situ par rayonnement X synchrotron à haute énergie ont été effectués
The use of duplex stainless steel (DSS) grades for structural applications is considered as one of the most significant advances impacting the construction sector. This is because of their high mechanical properties coupled with interesting functional properties such as corrosion resistance or even the low thermal conductivity compared to carbon steels. Due to their complex microstructure and interaction between the phases, DSS have a significant potential for unique properties. A better understanding is needed to give the possibility to obtain break through properties and to provide the possibility to design tailor-made, architectured DSS for specific applications. In this work we proposed a different approach from that used until now to understand the behavior of DSS. The strategy adopted in this work was a top-down strategy in which at least two bulk metals with well known behavior and properties are mechanically alloyed by Severe Plastic Deformation (SPD). This proposed strategy served two main objectives: i) enhancing the properties by microstructure refining down to sub-micron scale ii) elaborating a material model for understanding the DSS behavior obtained by the conventional metallurgical methods. The first objective of this work was, therefore, the implementation of a methodology of manufacturing using SPD technique by co-drawing. This technique will allow obtaining an ultra-fine microstructure of 316L/430LNb composites. One of the challenges met during our study was the significant inter-diffusion during heat-treatment step necessary during processing preventing by consequence further refining. An optimization investigation was carried out to account the role of this inter-diffusion for 316L/430LNb couple. Multi-scale micro-composites have been then obtained. In this work, we showed the limitation of this process in terms of microstructure refining. A rationalization of these limits was given by studying the thermo-kinetics of both micro-composites and bulk materials. In parallel with the microstructural evaluation, the mechanical behavior of these new micr-composites was examined. In order to provide a more in-depth explanation of the plastic behavior of our composites, in situ tensile test using high energy X-ray synchrotron have been performed
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Books on the topic "Micro composite"

1

Composites with micro- and nano-structure: Computational modeling and experiments. New York: Springer, 2008.

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Melis, Matthew E. COMGEN, a computer program for generating finite element models of composite materials at the micro level. [Washington, D.C.]: National Aeronautics and Space Administration, 1990.

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American Society of Mechanical Engineers. Winter Meeting. Recent advances in the macro- and micro-mechanics of composite materials structures: Presented at the Winter Annual Meeting of the American Society of Mechanical Engineers, Chicago, Illinois, November 27-December 2, 1988. New York, N.Y. (345 E. 47th St., New York 10017): The Society, 1988.

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Kompiš, Vladimir. Composites with Micro- and Nano-Structure. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6975-8.

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Saka, Masumi. Metallic Micro and Nano Materials: Fabrication with Atomic Diffusion. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2011.

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Šesták, Jaroslav. Thermal analysis of Micro, Nano- and Non-Crystalline Materials: Transformation, Crystallization, Kinetics and Thermodynamics. Dordrecht: Springer Netherlands, 2013.

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Hiroshi, Ito, American Chemical Society. Division of Polymeric Materials: Science and Engineering., and American Chemical Society Meeting, eds. Micro- and nanopatterning polymers. Washington, DC: American Chemical Society, 1998.

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Thomas, Sabu, Sajith Thottathil Abdulrahman, and Zakiah Ahmad. Micro and Nanostructured Composite Materials for Neutron Shielding Applications. Elsevier Science & Technology, 2020.

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Micro and Nanostructured Composite Materials for Neutron Shielding Applications. Elsevier, 2020. http://dx.doi.org/10.1016/c2019-0-00001-5.

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Thomas, Sabu, Nandakumar Kalarikkal, and Raghvendra Mishra. Micro and Nano Fibrillar Composites (MFCs and NFCs) from Polymer Blends. Elsevier Science & Technology, 2017.

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Book chapters on the topic "Micro composite"

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Wierach, Peter. "Nano-Micro-Macro." In Adaptive, tolerant and efficient composite structures, 17–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29190-6_2.

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Harik, Vasyl Michael. "Deformation of Composite Micro-Rods." In ICASE/LaRC Interdisciplinary Series in Science and Engineering, 39–58. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-007-1013-9_2.

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Cederbaum, Gabriel, and Jacob Aboudi. "Micro-to-Macro Analysis of Viscoelastic Laminated Plates." In Composite Structures 5, 779–93. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1125-3_49.

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Murín, Justín, Vladimír Kutiš, Michal Masný, and Rastislav Ďuriš. "Composite (FGM’s) Beam Finite Elements." In Composites with Micro- and Nano-Structure, 209–37. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6975-8_12.

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Flaschel, Peter. "Composite Classical and Keynesian Adjustment Processes." In Topics in Classical Micro- and Macroeconomics, 351–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00324-0_16.

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Henry, Todd C., Daniel P. Cole, Frank Gardea, and Robert A. Haynes. "Interphase Mechanics in Fatigued Carbon Fiber Composite Materials." In Micro and Nanomechanics, Volume 5, 29–35. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-63405-0_5.

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Wriggers, P., and M. Hain. "Micro-Meso-Macro Modelling of Composite Materials." In Computational Methods in Applied Sciences, 105–22. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6577-4_7.

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Sassov, Alexander, and Erik Buelens. "Micro-CT for Polymers and Composite Materials." In Functional Materials, 374–77. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607420.ch63.

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Ersoy, Orkun. "Detection of Dispersion and Venting Quality in Plastic Composite Granules Using Micro-CT." In Micro-computed Tomography (micro-CT) in Medicine and Engineering, 303–12. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-16641-0_19.

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Kim, Dong Hal, W. Hwang, Hyun Chul Park, and Kun Hong Lee. "Superhydrophobic Micro- and Nanostructures Based on Polymer Sticking." In Advances in Composite Materials and Structures, 897–900. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-427-8.897.

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Conference papers on the topic "Micro composite"

1

Kuo, Cheng-Hsiung, and Hwei-Ming Huang. "Measurements on the Thermal Conductivity of Epoxy/Carbon-Nanotube Composite." In ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer. ASMEDC, 2008. http://dx.doi.org/10.1115/mnht2008-52189.

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This study measures the thermal conductivity of the MWNT/epoxy bulk composite material to enhance the heat transfer rates of the high power LED device. In this study, three different weight percentages (0.0 wt%, 0.3 wt% and 0.5 wt%) of MWNT/Epoxy composite and five different heat generating rates were employed for the investigation. The case of pure epoxy resins (0.0 wt%) was used as a reference. The responding time and the thermal conductivity of the composites were evaluated. The results show that the response is the fastest for composite with 0.5 wt% MWNT among three composites studied herein. The responses of the 0.3%wt and 0.5%wt composite are increased by 14.3%∼26.7% relative to that of the pure epoxy. Compare with that of the pure epoxy, the thermal conductivities for the cases with 0.3 wt% and 0.5 wt% MWNT/epoxy composite are increased by 15.9%∼44.9%. Further, the thermal conductivity does not vary with temperature for the temperature range studied herein. In the present study, the thermal conductivity of the composite material is found to increase mildly with the increasing heat generation rate.
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Lukefahr, Andrew, Shruti Padmanabha, Reetuparna Das, Faissal M. Sleiman, Ronald Dreslinski, Thomas F. Wenisch, and Scott Mahlke. "Composite Cores: Pushing Heterogeneity Into a Core." In 2012 45th Annual IEEE/ACM International Symposium on Microarchitecture (MICRO). IEEE, 2012. http://dx.doi.org/10.1109/micro.2012.37.

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MAZUMDER, AGNIPROBHO, YOUQI WANG, and CHIAN FONG YEN. "Conforming Element Mesh for Realistic Textile Composite Micro-Geometry." In American Society for Composites 2018. Lancaster, PA: DEStech Publications, Inc., 2018. http://dx.doi.org/10.12783/asc33/26102.

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Lu, Min, Christopher Jenkins, and Robb Winter. "Micro-Mechanical Modeling of the Adhesive Interface in Composite-Composite Joints." In 44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-1759.

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Frechette, M. F., C. Vanga-Bouanga, and E. David. "Epoxy containing micro-nano carbonaceous composite additives." In 2015 IEEE 11th International Conference on the Properties and Applications of Dielectric Materials (ICPADM). IEEE, 2015. http://dx.doi.org/10.1109/icpadm.2015.7295263.

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Naik, Nisarga N., and Mark G. Allen. "Fabrication of Glass-Metal Composite Micro/Nanonozzles." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67711.

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This paper reports a fabrication technique for high strength glass-metal composite micro/nanonozzles with orifice diameters ranging from 430 nm to >100 μm. Unlike the conventional methods used to build micro/nanonozzles, the fabrication technique discussed in this paper is a non-lithographic approach. It uses conventional pulled borosilicate micropipettes as a foundation and nickel as a strengthening layer to build high pressure withstanding micro/nanonozzles. Pipettes built using the pulling process offer a smooth transition to the fluid from the reservoir to the tapered part of the nozzle, providing an ideal geometry from fluid flow and stress point of view. The nozzles are tested for high pressure withstanding capacity by integrating them with a high pressure fluidic setup to drive microjets. As an example, a 1.5 μm diameter nozzle, tested with propane as the working fluid to drive a microjet is observed to withstand pressures upto 10.5 MPa. Apart from simplicity of the fabrication process, this approach also offers the ability to incorporate a wireless temperature control system for the nozzles.
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Yang, Jiaping, Cheng Peng Tan, Nyok Boon Chong, and Gih Keong Lau. "Rotary Silicon Polymeric Composite Thermal Micro-Actuator." In ASME 2013 Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/isps2013-2891.

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This paper reports a new rotary thermal micro-actuator. This new thermal actuator uses a pair of powerful silicon-polymeric composite benders to actuate a magnetic head slider into a rotation when the expandable polymer elements are resistively heated. The advantage is the rotary micro-actuator design can move the read/write head slider with a larger lateral displacement by using a new T-shape central hinge joint as compared to the previous translational design. The experimental results demonstrate that the prototyped device can reach up 314nm displacement by a 4V step voltage. The 1st mechanical resonance frequency has been pushed up to 35 kHz. Simulation shows that the micro-actuator can be subjected to 1000G shock loading under non-operation mode. The large displacement, high resonance frequency and robust shock resistance make the rotary thermal micro-actuator be very suitable for a wide range of precise positioning systems applications including dual-stage positioning systems in disk drives and resonance switches in microsystems.
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CATER, CHRISTOPHER R., XINRAN XIAO, ROBERT K. GOLDBERG, and XIAOJING GONG. "Multiscale Investigation of Micro-Cracking at Composite Laminate Free Edge." In American Society for Composites 2017. Lancaster, PA: DEStech Publications, Inc., 2017. http://dx.doi.org/10.12783/asc2017/15326.

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Yao, Kang, Richard Liang, and Jim P. Zheng. "Prelithiated Si nanoparticles-carbon nanotubes composite anodes for Li-ion batteries." In Nano-Micro Conference 2017. London: Nature Research Society, 2017. http://dx.doi.org/10.11605/cp.nmc2017.01027.

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Idrisi, Amir Hussain, and Abdel-Hamid Ismail Mourad. "Fabrication and Wear Analysis of Aluminium Matrix Composite Reinforced by SiC Micro and Nano Particles." In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65459.

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Metal matrix composites (MMCs) constitute an important class of weight-efficient structural material which empowering every field of engineering applications. Aluminium based metal matrix composites contains potential for high specific strength and advanced structural applications, as well as good elevated temperature resistance along with light weight application. However, need for improved tribological performance has led to the fabrication of newer variants of the composite. In the present work, aluminium based metal matrix composite (MMCs) developed through stir casting route by reinforcing different weight percentage of SiC micro (5% and 10%) and nano (1% and 2%) particles. In this research, 5083 aluminium alloy is used as matrix phase due its broad range of industrial applications. Wear behaviour of the developed aluminium matrix composite (AMC) was investigated under different conditions of applied load, operation time and speed. The analysis carried out at room temperature for three different loads (10N, 20N, and 30N) with varying four different operation times (30 mins, 60 mins, 90 mins, and 120 mins). The speed was kept constant at 1450 rpm during all experiments. The results of all considered composites are investigated and the composite with 2% SiC nano reinforcement is identified as a superior among all other composition for tribological applications point of view. Also the developed aluminium matrix composites have potential applications in many industries such as pressure vessels, pipe fittings, boat hulls, gears and pistons.
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Reports on the topic "Micro composite"

1

Holmes, Jr, and Larry R. Micro-Composite Fabrication via Field-Aided Laminar Composite (FALCom) Processing. Fort Belvoir, VA: Defense Technical Information Center, September 2012. http://dx.doi.org/10.21236/ada567078.

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Luzinov, Igor, and Konstantin Kornev. Functionalized Nano and Micro Structured Composite Coatings. Fort Belvoir, VA: Defense Technical Information Center, June 2011. http://dx.doi.org/10.21236/ada552528.

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Giedd, Ryan, Matt Curry, Paul Durham, and Norm Dobson. Biosensors Made From Carbon and Polymer Composite Micro-Electromechanical Systems (MEMS). Fort Belvoir, VA: Defense Technical Information Center, August 2004. http://dx.doi.org/10.21236/ada426181.

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Giedd, Ryan, Matt Curry, Paul Durham, and Norm Dobson. Biosensors Made from Carbon and Polymer Composite Micro-Electromechanical Systems (MEMS). Fort Belvoir, VA: Defense Technical Information Center, December 2003. http://dx.doi.org/10.21236/ada419760.

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Liu, C. T. Micro-Macro Behavior Near the Crack Tip in a Particulate Composite Material. Fort Belvoir, VA: Defense Technical Information Center, January 1997. http://dx.doi.org/10.21236/ada381365.

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Newman, J. K., and James E. Shoenberger. E-Krete(Trademark) Polymer Composite Micro-Overlay for Airfields: Laboratory Results and Field Demonstrations. Fort Belvoir, VA: Defense Technical Information Center, November 2003. http://dx.doi.org/10.21236/ada419412.

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Madenci, Erdogan. An Inverse Approach for Capturing the Interaction of Macro- and Micro-Scales in Characterizing Bonded Composite Joints. Fort Belvoir, VA: Defense Technical Information Center, May 2000. http://dx.doi.org/10.21236/ada387637.

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Daly, C. H., Mark E. Tuttle, and William Kuykendall. Design and Analysis for the Carbon Fiber Composite Support Structure for Layer 0 of the D0 Silicon Micro Tracker. Office of Scientific and Technical Information (OSTI), January 2009. http://dx.doi.org/10.2172/971000.

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Wang, Youqi. Micro-Stress and Failure Analysis of Textile Composites. Fort Belvoir, VA: Defense Technical Information Center, June 2003. http://dx.doi.org/10.21236/ada417688.

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O'Connor, Charles J., Leszek Malkinski, and N. Babu. Nanoscale Engineering of Multiferroic Hybrid Composites for Micro- and Nano-scale Devices. Fort Belvoir, VA: Defense Technical Information Center, September 2012. http://dx.doi.org/10.21236/ada568709.

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