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Dissertations / Theses on the topic 'Composite structure model'

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Published: 3 June 2025

Last updated: 20 July 2025

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1

Phongphinittana, Ekkarin. "Assemblages composites-polymères après traitement par plasma atmosphérique du composite : caractérisation mécaniques et modélisation." Thesis, Paris, ENMP, 2014. http://www.theses.fr/2014ENMP0070.

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A la suite des propositions de la commission européenne, visant à concrétiser les objectifs de réduction des émissions de dioxyde de carbone (CO2) des voitures. Pour atteindre cet objectif, les constructeurs automobiles doivent réduire le poids de la voiture. Ainsi l'équipementier FAURECIA, fabricant de sièges de voiture désire remplacer les structures métalliques par des structures hybrides plastique-métal (PMH). Et en plus, il désire également utiliser un matériau composite en remplacement du métal pour diminuer le poids et utiliser la technique du plasma atmosphérique pour améliore le force

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2

Borakiewicz, Eva. "An adaptive multi-model approach for damage propagation simulations in large composite structures." Thesis, université Paris-Saclay, 2021. http://www.theses.fr/2021UPAST029.

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Les industriels du domaine aéronautique s'intéressent à la réalisation de simulations prédictives à l'échelle structurale. Dans ces situations, la taille des problèmes mécaniques concernés est telle que l'utilisation de modèles matériaux et de discrétisations éléments finis simplifiés est indispensable. Ainsi, la structure primaire d'un avion étant majoritairement composée d'éléments élancés et les problématiques principales des simulations menées étant liées aux instabilités de flambage dans un contexte de grandes transformations géométriques, ce sont souvent des éléments finis structuraux co

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3

Roberts, Matthew Lowell. "Development of a Finite Element Model for Predicting the Impact Energy Absorbing Performance of a Composite Structure." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1272.

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Because of their high strength-to-weight ratio, Fiber Reinforced Composite (FRC) materials are well suited for use in high performance racing applications where weight must be kept to a minimum. Formula SAE (FSAE) race cars are designed and built by college students, roughly following the model of a scaled down Formula One car. Strict regulations are placed on specific components of the car in the interest of equalizing competition and ensuring the safety of the drivers. Students are required to construct a survival cell (the chassis), which can resist large amounts of energy in the event of a

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4

FERNANDEZ, BARRERO DIEGO. "Dynamic Soil-Structure Interactionof Soil-Steel Composite Bridges : A Frequency Domain Approach Using PML Elements and Model Updating." Thesis, KTH, Bro- och stålbyggnad, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-256033.

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This master thesis covers the dynamic soil structure interaction of soil-steel culverts applyinga methodology based on the frequency domain response. At the first stage of this masterthesis, field tests were performed on one bridge using controlled excitation. Then, themethodology followed uses previous research, the field tests, finite element models (FEM)and perfectly matched layer (PML) elements.Firstly, a 2D model of the analysed bridge, Hårestorp, was made to compare the frequencyresponse functions (FRF) with the ones obtained from the field tests. Simultaneously, a 3Dmodel of the bridge

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5

Le, Thi Huyen Cham. "Robust variable kinematics plate ﬁnite elements for composite structures". Thesis, Paris 10, 2019. http://faraway.parisnanterre.fr/login?url=http://bdr.parisnanterre.fr/theses/intranet/2019/2019PA100053/2019PA100053.pdf.

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Le but de ce travail est de développer deux nouveaux éléments ﬁnis quadrilatéraux à quatre et à huit nœuds implantés dans le code commercial de calcul par Eléments Finis (EF) Abaqus pour plaques composites. Les modèles plaques à cinématique variable sont formulés dans le cadre de la formulation uniﬁée de Carrera (CUF), qui regroupent des descriptions de type: couche équivalente (ESL) et couches discrètes (LW), avec les variables déﬁnies par des polynômes jusqu’au 4ème ordre suivant épaisseur z. Les deux formulations variationnelles sont utilisées pour dériver les matrices des éléments ﬁnis: le

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6

Mahmoudi, Saber. "Dynamique des structures composites linéaires et non-linéaires en présence d'endommagement." Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCD052/document.

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Les structures composites sont souvent exposées à des ambiances dynamiques plus oumoins sévères. Ces vibrations peuvent développer différentes formes d’endommagement(fracture des fibres, délamination, fissuration de la matrice. . . ). Les défauts locaux sepropagent et affectent les propriétés mécaniques de la structure modifiant ainsi soncomportement dynamique global. Ces changements peuvent induire une dégradationrapide de la structure et une réduction de sa durée de vie. La thèse a pour objectif lamise en oeuvre de modèles de comportement pour le dimensionnement de structurescomplexes intégr

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7

Husseini, Orabi Mahmoud. "Facilitating the Representation of Composite Structure, Active objects, Code Generation, and Software Component Descriptions in the Umple Model-Oriented Programming Language." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36452.

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For a long time, the development of component-based systems has been a crucial part of real-time software development required for embedded and automotive domains. However, most of the existing tools used in these fields are not only proprietary, but also expensive and not research-friendly. Open-source tools in this domain are so far quite limited in terms of the features supported, especially, code generation. In this thesis, we demonstrate how we can improve the development of real-time and concurrent systems by the introduction of component-based modelling into Umple, an open-source model

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8

Somanath, Nagendra. "A finite element cure model and cure cycle optimization for composite structures." Thesis, This resource online, 1987. http://scholar.lib.vt.edu/theses/available/etd-04272010-020304/.

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9

Call, Russell Kent. "Parameter establishment and verification of a fabrication stress model and a thermo-kinetic cure model for filament wound structures." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-08142009-040256/.

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10

VARELLO, ALBERTO. "Advanced higher-order one-dimensional models for fluid-structure interaction analysis." Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2517517.

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The aim of this work is the development of a refined reduced order model suitable for numerical applications in solid and fluid mechanics with a remarkable reduction in computational cost. Nowadays, numerical reduced order models are widely exploited in many areas, such as aerospace, mechanical and biomechanical engineering for structural analysis, fluid dynamic analysis and coupled (aeroelastic) fluid-structure interaction analysis. One-dimensional (1D) structural models, commonly known as beams, are for instance used in many applications to analyze the structural behavior of slender bodies,

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11

Le, Riche Rodolphe. "Optimization of composite structures by genetic algorithms." Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06062008-164513/.

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12

Lee, Hao. "Damage modelling for composite structures." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/damage-modelling-for-composite-structures(ee416524-935c-487d-bcd5-282875e6027a).html.

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Modelling damage in composite materials has played an important role in designing composite structures. Although numerical models for the progressive damage in laminated composites (e.g. transverse cracking, delamination and fibre breakage) have been developed in the literature, there is still a need for further improvement. This thesis aimed at developing damage models suitable for predicting intra-laminar and inter-laminar damage behaviour in fibre-reinforced composite materials. Several approaches such as fracture mechanics and continuum damage mechanics have been adopted for constructing t

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13

Muliana, Anastasia Hanifah. "Integrated Micromechanical-Structural Framework for the Nonlinear Viscoelastic Behavior of Laminated and Pultruded Composite Materials and Structures." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5142.

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This study introduces a new three-dimensional (3D) multi-scale constitutive framework for the nonlinear viscoelastic analysis of laminated and pultruded composites. Two previously developed nonlinear micromechanical models for unidirectional and in-plane random composite layers are modified to include time-dependent and nonlinear behavior. A new recursive-iterative numerical integration method is introduced for the Schapery nonlinear viscoelastic model and is used to model the isotropic matrix subcells in the two micromodels. In addition, a sublaminate model is used to provide for a through

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VIGLIETTI, ANDREA. "Low Fidelity and High Fidelity Structural Models for Hybrid Composite Aircraft Structures." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2710182.

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This thesis extends advanced one-dimensional models derived from the use of the Carrera Unified Formulation (CUF) to a High-Fidelity modeling approach, which has been used to perform analyses of multi-component aeronautical structures guaranteeing a proper description of each component regarding geometry and material. Static analyses and free vibration analyses have been performed to validate the current CUF model for the studies of structures, which present multi-component nature, sweep angle and non-prismatic shape; subsequently, its capabilities have been exploited to investigate different

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15

Tse, Mawuli I. (Mawuli Israel). "Design cost model for advanced composite structures." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/12933.

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16

Chebbi, Houssem. "Méthode des coordonnées curvilignes pour la modélisation électromagnétique des matériaux complexes : application au contrôle non destructif par courants de Foucault des matériaux composites The fast computation of eddy current distribution and probe response in homogenized composite material based on semi-analytical approach Investigation of layer interface model of multi-layer structure using semi-analytical and FEM analysis for eddy current pulsed thermography." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST004.

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Ce travail de thèse de doctorat, effectué au sein de Laboratoire de Simulation et Modélisation Électromagnétique (LSME) du CEA List, s’intègre dans le cadre du projet européen « NDTonAir » financé sous l'action « H2020-MSCA-ITN-2016- GRANT 722134 ». Le principal objectif est le développement d’un outil de simulation rapide et précis dédié au contrôle non destructif par courants de Foucault des matériaux composites homogénéisés. Comme cas d’application, on s’intéresse particulièrement à l’orientation des fibres d’une part, et d’autre part, à des défauts de type délaminage et ondulation des fibr

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17

Oehlers, Deric John. "Mechanisms in composite structures /." Title page, abstract and table of contents only, 2004. http://web4.library.adelaide.edu.au/theses/09END/09endo285.pdf.

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18

Chang, Min-Yung. "Active vibration control of composite structures." Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-09162005-115021/.

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19

Vandellos, Thomas. "Développement d’une stratégie de modélisation du délaminage dans les structures composites stratifiées." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14380/document.

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Les composites stratifiés de plis unidirectionnels en carbone/époxy sont fortement utilisés pour alléger les structures aéronautiques tout en conservant de bonnes propriétés structurales. Toutefois, les avantages de ce type de matériau ne sont pas encore pleinement exploités de par le manque de confiance accordée aux modèles de prévision de l’endommagement, dont notamment ceux concernant le délaminage. C’est pourquoi l’objectif de cette thèse était de développer une stratégie de modélisation du délaminage adaptée aux structures composites stratifiées. Cette stratégie s’est appuyée sur le dével

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20

Chretien, Nicolas. "Numerical Constitutive Models of Woven and Braided Textile Structural Composites." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/31902.

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Equivalent, three-dimensional elastic moduli are determined from unit cell models of balanced plain weave, 2D braid, 2D triaxial braid and 4x4 twill textile composite materials consisting of interlaced or intertwined yarns. The yarn paths are modeled with undulation portions, in which one yarn passes over and under one or more yarns, and with straight portions. It is assumed that the centerline of a yarn in the undulation portions is described by the sine function, and that the cross-sectional area of a yarn and the thickness of a yarn, normal to the centerline, are uniform along the centerlin

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21

Alroughani, Hamad. "An Appraisal of the Characteristic Modes of Composite Objects." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/26271.

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The theory of electromagnetic characteristic modes was published roughly forty years ago, for both conducting and penetrable objects. However, while the characteristic mode analysis of conducting objects has found renewed interest as a tool for antenna designers, computed results for the characteristic mode eigenvalues, eigencurrents and eigenfields for penetrable objects have not appeared, not even in the seminal papers on the subject. In this thesis both volume and surface integral equation formulations are used to compute the characteristic modes of penetrable objects for what appears to be

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22

Tremaine, Kellie Michelle. "MODAL ANALYSIS OF COMPOSITE STRUCTURES WITH DAMPING MATERIAL." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/823.

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The purpose of this study is to develop an analytical solution for modal analysis of actively damped orthotropic composite plates in bending and to verify it with experimental analysis. The analytical modal analysis solution for composite plate dynamics is derived using Euler theory. This analysis applies to structures with orthotropic lamina of uniform material properties at any lamination angle. The bending-extensional coupling can be neglected for plates that are symmetric or approximately symmetric, which allows an exact solution for natural frequency and mode shape to be obtained. An exac

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23

Blanc, Rémy. "Etude de l'injection des composites polyesters thermodurcissables : relations entre la phase de remplissage des moules et l'orientation du renfort." Paris, ENMP, 1988. http://www.theses.fr/1988ENMP0140.

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Apres presentation du procede zmc, etude de l'orientation des fibres de verre sur 3 geometries de pieces. Etude experimentale du remplissage des moules et de la rheologie du materiau. Modelisation de l'influence de la reticulation et de la pseudoplasticite par une loi rendant compte du comportement non newtonien hereditaire; integration de cette loi dans un modele thermomecanique de remplissage. Calcul de l'orientation des fibres par la theorie de jeffery; resultats montrant l'influence des parametres experimentaux (longueur des fibres, reactivite. . . )

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24

Cooper, Edward. "An elastic-plastic finite element model for composite crash structures." Thesis, University of Nottingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268468.

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25

Nguyen, Vinh Dinh. "A fabrication stress model for axisymmetric filament wound composite structures." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/77829.

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A comprehensive fabrication stress model was developed to compute fiber stresses in axisymmetric filament wound composite structures at any stage of the fabrication process, a prerequisite for the evaluation of the performance of the composite structures from fabrication process variables. The stress model uses an isoparametric axisymmetric finite element formulation and a double-layered composite element to model the mechanical behavior of the composite material in any cure state. An incremental finite element formulation was used to model the winding and mandrel removal stages. A thermo-mech

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26

Li, Yang. "Octacalcium phosphate-metabolite composites : model compounds for bone mineral structure." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274877.

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Bone turnover has important impacts on bone health. The process modifies weak primary woven bone into the strong lamellar bone, repairs damage in bone, and maintains appropriate calcium homeostasis. The process relies heavily on controlled osteoclastic resorption by dissolution of mineral in the area undergoing remodelling. Bone degenerative diseases occur when the balance between bone resorption and deposition of new bone in the turnover process is altered. Bone is a nanocomposite material composed of a mineral phase (calcium phosphate) deposited within an organic matrix. In spite of the inte

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Ribeiro, Marcelo Leite. "Damage and progressive failure analysis for aeronautic composite structures with curvature." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/18/18148/tde-18112013-140301/.

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Recent improvements in manufacturing processes and materials properties associated with excellent mechanical characteristics and low weight have became composite materials very attractive for application on civil aircraft structures. However, even new designs are still very conservative, because the composite structure failure phenomena are very complex. Several failure criteria and theories have been developed to describe the damage process and how it evolves, but the solution of the problem is still open. Moreover, modern manufacturing processes, e.g. filament winding, have been used to prod

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Kilic, Mustafa Hakan. "Three-dimensional micromechanical models for the nonlinear analysis of pultruded composite structures." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/20735.

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Matthews, Timothy Stirling. "Non-destructive inspection of composite structures using modal analysis." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA296673.

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30

Soufri, Ayoub. "Multi-impact behavior of composite structures : experimental and numerical approach." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2023. http://www.theses.fr/2023UBFCK038.

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Les matériaux composites sont largement utilisés dans le domaine des transports en raison de leurs propriétés mécaniques spécifiques élevées. Cependant, au cours de leur cycle de vie, ils peuvent subir une dégradation significative de leurs propriétés mécaniques lorsqu'ils sont soumis à des chargements d'impacts. Les dommages induits par des impacts se manifestent sous différentes formes telles que la rupture des fibres, la fissuration matricielle, la décohésion fibres/matrice et le délaminage. L'étude du comportement aux impacts des structures composites a suscité une attention importante dan

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31

Yu, Wenbin. "Variational asymptotic modeling of composite dimensionally reducible structures." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/12225.

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Orifici, Adrian Cirino, and adrian orifici@student rmit edu au. "Degradation Models for the Collapse Analysis of Composite Aerospace Structures." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080619.090039.

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Koh, Yeow Leung 1976. "In-situ structural health monitoring of composite repair patches." Monash University, Dept. of Mechanical Engineering, 2002. http://arrow.monash.edu.au/hdl/1959.1/7698.

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Kerber, Thierry. "Réponse à un impact localisé d'une structure coque composite multicouche rotationnelle : études théoriques et mise au point de méthodes numériques." Châtenay-Malabry, Ecole centrale de Paris, 1995. http://www.theses.fr/1995ECAP0383.

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Résoudre des problèmes d'impacts localises sur des coques composites multicouches reste à l'heure actuelle un véritable défi. Les couts informatiques, en stockages et en calculs, s'avèrent en effet gigantesques des qu'on s'intéresse à des cas industriels. De plus, les problèmes de fiabilité des résultats se posent de façon cruciale. Parmi ces difficultés, dominent la modélisation des coques et la résolution des problèmes d'impacts, incluant les choix délicats des discrétisations spatio-temporelles. Lorsque les structures étudiées présentent des symétries, en particulier axiales, de nouvelles o

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Browne, Thomas Naoise Alan. "A model for the structural integrity of composite laminates in fire." Thesis, University of Newcastle Upon Tyne, 2006. http://hdl.handle.net/10443/246.

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This thesis describes a model for the integrity of composite laminates in fire. The model was based on laminate theory analysis and a one dimensional heat transfer model, and was validated for three materials; glass reinforced polyester, glass reinforced vinyl ester and glass reinforced polypropylene. A small-scale fire resistance test, based on a simple burner, is also described. A propane burner was used to produce a constant heat flux for testing composite laminates. The thermal response was measured at the rear face of the sample in a 50kW/m2 fire. A one dimensional thermal model was used

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Liu, Albert Darien. "THE EFFECT OF SENSOR MASS, SENSOR LOCATION, AND DELAMINATION LOCATION OF DIFFERENT COMPOSITE STRUCTURES UNDER DYNAMIC LOADING." DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/917.

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This study investigated the effect of sensor mass, sensor location, and delamination location of different composite structures under dynamic loading. The study pertains to research of the use of accelerometers and dynamic response as a cost-effective and reliable method of structural health monitoring in composite structures. The composite structures in this research included carbon fiber plates, carbon fiber-foam sandwich panels, and carbon-fiber honeycomb sandwich panels. The composite structures were manufactured with the use of a Tetrahedron MTP-8 heat press. All work was conducted in the

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Rodrigues, Monise de Paula. "Molares permanentes de pacientes jovens com cárie profunda versus tratados endodonticamente e restaurados com resina composta bulk fill – Análise da força de mordida e por elementos finitos específico." Universidade Federal de Uberlândia, 2018. http://dx.doi.org/10.14393/ufu.di.2018.131.

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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>FAPEMIG - Fundação de Amparo a Pesquisa do Estado de Minas Gerais<br>O tratamento endodôntico associado à restauração direta com resina composta tem sido utilizado para restaurar molares severamente destruídos em pacientes jovens. O objetivo deste estudo foi avaliar o efeito de diferentes níveis de perda de estrutura dentária antes e após a realização de tratamento endodôntico e restauração com resina composta bulk fill na distribuição de tensões e magn

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Simon, Joshua Cameron. "Response and Failure of Adhesively Bonded Automotive Composite Structures under Impact Loads." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/34881.

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An experimental technique for conducting low speed impact of adhesively bonded automotive composite joints is presented. Based on the use of a modified drop tower, mode I, II, and mixed mode values for critical energy release rate were determined for a composite/epoxy system and used to create a fracture failure envelope. Because load measurements become erratic and unreliable at higher test rates, displacement-based relationships were used to quantify these energy release rates. Displacement data was collected with an imaging system that utilized edge detection to determine displacement pr

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AMINJIKARAI, SRINIVASA BABU. "A STRAIN RATE DEPENDENT 3D MICROMECHANICAL MODEL FOR FINITE ELEMENT SIMULATIONS OF PLAIN WEAVE COMPOSITE STRUCTURES." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1070549522.

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Aljets, Dirk. "Acoustic emission source location in composite aircraft structures using modal analysis." Thesis, University of South Wales, 2011. https://pure.southwales.ac.uk/en/studentthesis/acoustic-emission-source-location-in-composite-aircraft-structures-using-modal-analysis(6871e94b-6e94-4efd-b563-41b254ee27b4).html.

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The aim of this research work was to develop an Acoustic Emission (AE) source location method suitable for Structural Health Monitoring (SHM) of composite aircraft structures. Therefore useful key signal features and sensor configurations were identified and the proposed method was validated using both artificially generated AE as well as actual AE resulting from damage. Acoustic Emission is a phenomenon where waves are generated in stressed materials. These waves travel through the material and can be detected with suitable sensors on the surface of the structure. These stress waves are attri

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Makhecha, Dhaval Pravin. "Dynamic Fracture of Adhesively Bonded Composite Structures Using Cohesive Zone Models." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29631.

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Using experimental data obtained from standard fracture test configurations, theoretical and numerical tools are developed to mathematically describe non-self-similar progression of cracks without specifying an initial crack. A cohesive-decohesive zone model, similar to the cohesive zone model known in the fracture mechanics literature as the Dugdale-Barenblatt model, is adopted to represent the degradation of the material ahead of the crack tip. This model unifies strength-based crack initiation and fracture-mechanics-based crack progression. The cohesive-decohesive zone model is implemente

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Chillara, Venkata Siva Chaithanya. "Multifunctional Laminated Composites for Morphing Structures." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524104865278235.

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AUGELLO, RICCARDO. "Advanced FEs for the micropolar and geometrical nonlinear analyses of composite structures." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2872330.

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Lin, Shuyuan. "Development of robust connection models for steel and composite structures in fire." Thesis, Brunel University, 2014. http://bura.brunel.ac.uk/handle/2438/10458.

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Structural engineers and architects have a responsibility for incorporating fire safety into their building designs in order to minimize loss of life and property. To meet this requirement, extensive research has been carried out, aimed at obtaining better understanding of the performance of steel and composite structures under fire conditions. Recent research indicates that the robustness of steel connections is vitally important to the fire resistance of steel-framed composite buildings. The development of effective connection models is a key issue in this research field. This PhD research i

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Kahle, Matthew Gilbert. "Partially restrained composite connections : design and analysis of a prototype structure." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/20830.

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Zhang, Zhiye. "Modeling, Analysis, and Experiments of Inter Fiber Yarn Compaction Effects in Braided Composite Actuators." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/29162.

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The braided composite actuator is a pressure-driven muscle-like actuator capable of large displacements as well as large blocking forces. It consists of an elastomeric tube reinforced by a sleeve braided by high performance fibers. In addition to the actuation properties, this actuator can also exhibit a large change in stiffness through simple valve control when the working fluid has a high bulk modulus. Several analytical models have been previously developed that capture the geometrical and material nonlinearities, the compliance of the inner liner, and entrapped air in the fluid. The inte

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Paget, Christophe. "Active Health Monitoring of Aerospace Composite Structures by Embedded Piezoceramic Transducers." Doctoral thesis, KTH, Aeronautical Engineering, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3277.

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<p>The objectives of the thesis work were to study theinteraction between embedded piezoceramic transducers andcomposite structures as well as determine techniques tosimplify the Lamb waves analysis. Firstly, this studyconsidered the design of the embedded piezoceramic transducers.Secondly, the effect of the embedded transducer on thecomposite strength as well as the influence of the mechanicallyloaded composite on the characteristics of the embeddedtransducer were investigated. Finally, to simplify the analysisof such complex Lamb wave responses, two techniques weredeveloped. They were based

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Bettadahalli, Channakeshava Anil. "Non-Local Modeling of the Compressive Strength of Composite Structures." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2020. http://www.theses.fr/2020ESMA0018.

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La rupture en compression des composites à fibers de carbone longues est due à des mécanismes complexes. La connaissance de ces mécanismes est importante pour la conception des structures composites car la résistance à la compression et la rigidité des stratifiés sont supposées inférieures à leur résistance à la traction. De plus, la rupture en compression est un mécanisme de ruine non locale qui dépend de la structure du composite (épaisseur de la couche, gradient de charge), ce qui en fait une particularité. Ce mécanisme a été décrit et modélisé dans la littérature avec des outils numériques

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Wong, King Jye. "Moisture absorption characteristics and effects on mechanical behaviour of carbon/epoxy composite : application to bonded patch repairs of composite structures." Phd thesis, Université de Bourgogne, 2013. http://tel.archives-ouvertes.fr/tel-00949293.

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Le travail présenté dans ce mémoire avait pour objectif d'étudier le processus de la pénétration d'eau dans les composites en carbone/époxyde dans un premier temps, et dans un deuxième temps, d'étudier l'effet de la prise en eau par ces matériaux sur les performances mécaniques des composites et leur joints collés. L'intégration de ces phénomènes physiques dans la modélisation numérique est d'une grande importance dans la prédiction de la durabilité d'une structure en composite subissant un vieillissement hygrothermique. Par conséquent, ce travail consiste non seulement en des observations exp

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Moraes, Victor Marcuz de [UNESP]. "Ponte mista de madeira-concreto em vigas treliçadas de madeira." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/91472.

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Made available in DSpace on 2014-06-11T19:25:21Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-04-11Bitstream added on 2014-06-13T18:53:17Z : No. of bitstreams: 1 moraes_vm_me_ilha_prot.pdf: 4456756 bytes, checksum: 70a028ea28db2cfaed1abecec234c525 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>As pontes mistas com vigas de madeira e tabuleiro de concreto, que constituem uma técnica já bastante estudada pelo meio acadêmico brasileiro, vêm ganhando cada vez mais espaço entre os projetistas e construtores de pontes em estradas vicinais do interior do Br

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