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Dissertations / Theses on the topic 'Functionally Graded Material (FGM)'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Hosseinzadeh, Delandar Arash. "Finite element analysis of thermally induced residual stresses in functionally graded materials." Thesis, KTH, Materialvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-92519.

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Functionally graded materials (FGMs) are advanced materials and their main characteristic is microstructure and composition variation over the volume of the specimen. This variation of the composition results in changing of material properties in the component. In FGMs usually there are two different types of powder materials such as metal and ceramic powders which are mixed to build up the graded region. These grade layers are placed between the metal and ceramic layers and by this approach a smooth and gradual transient from metal to ceramic can be achieved.Sintering is the main technique to
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2

Mellachervu, Krishnaveni. "Study of the honeycomb structures and functionally graded materials using the BEM and FEM." Cincinnati, Ohio : University of Cincinnati, 2008. http://rave.ohiolink.edu/etdc/view.cgi?acc_num=ucin1206460053.

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Thesis (M.S.)--University of Cincinnati, 2008.<br>Advisor: Yijun Liu. Title from electronic thesis title page (viewed Feb.25, 2009). Includes abstract. Keywords: Honeycomb; FGM; BEM; FEM. Includes bibliographical references.
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3

DESHMUKH, PUSHKARAJ M. "MODELING ERROR ESTIMATION AND ADAPTIVE MODELING OF FUNCTIONALLY GRADED MATERIALS." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1096036755.

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4

Cetin, Suat. "Analytical Solution Of A Crack Problem In A Radially Graded Fgm." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12609120/index.pdf.

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The objective of this study is to determine stress intensity factors (SIFs) for a crack in a radially graded FGM layer on a substrate. Functionally graded coating with an edge crack perpendicular to the interface and a homogeneous substrate are bonded together. In order to make the problem analytically tractable, geometry is modeled as an FGM strip attached to a homogeneous layer. Introducing the elastic foundation underneath the homogeneous layer, an FGM coating on a thin walled cylinder can be modeled. At first, governing equations are obtained from stress displacement and equilibrium equati
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5

Okubo, Hitoshi, Hideki Shumiya, Masahiro Ito, and Katsumi Kato. "Insulation Performance of Permittivity Graded FGM (Functionally Graded Materials) in SF6 Gas under Lightning Impulse Conditions." IEEE, 2006. http://hdl.handle.net/2237/9496.

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6

Okubo, Hitoshi, Masafumi Takei, Yoshikazu Hoshina, Masahiro Hanai, Katsumi Kato, and Muneaki Kurimoto. "Application of Functionally Graded Material for Reducing Electric Field on Electrode and Spacer Interface." IEEE, 2010. http://hdl.handle.net/2237/14528.

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7

Ince, Ismet. "Periodic Crack Problem For An Fgm Coated Half Plane." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614376/index.pdf.

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An elastic FGM layer bonded to a semi-infinite linear elastic, isotropic, homogeneous half plane is considered. The half plane contains periodic cracks perpendicular to the interface. Mechanical loading is applied through crack surface pressure, resulting in a mode I crack problem. The plane elasticity problem described above is formulated by using Fourier transforms and Fourier series. A singular integral equation is obtained for the auxiliary variable, namely derivative of the crack surface displacement. Solution is obtained, and stress intensity factors are calculated for various values of
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8

Odorczyk, Marcos Fernando. "Uma estratégia numérica para análise termoelástica de sólidos recobertos com filmes de material funcionalmente gradado (FGM)." Universidade do Estado de Santa Catarina, 2011. http://tede.udesc.br/handle/handle/1796.

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Made available in DSpace on 2016-12-08T17:19:39Z (GMT). No. of bitstreams: 1 pre-textuais.pdf: 99837 bytes, checksum: 26af6e9b202afa9fa60be43b442df83a (MD5) Previous issue date: 2011-07-29<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The finite element method has been traditionally applied in solving problems of elasticity and heat transfer, being widely used in cases with homogeneous isotropic materials. With the advent of new technologies, it has been more frequent to use components with more than one material, aiming to get the most out of each phase. A common example
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9

Sivakumar, V. "Processing, Characterization And Evaluation Of A Functionally Graded Ai - 4.6% Cu Alloy." Thesis, Indian Institute of Science, 2000. https://etd.iisc.ac.in/handle/2005/183.

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In some applications the stress across the entire cross-section of a component is not uniform but varies with position. For example, maximum shear stress is highest at the inner surface of a thick-walled cylinder subjected to uniform internal pressure and it decreases continuously towards the outer surface. In such applications it would be more appropriate for the component, too, to have varying strength across the cross-section matching with the stress profile it is subjected to. The present work deals with obtaining such a functionally graded material (FGM), characterizing it and testing its
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10

Sivakumar, V. "Processing, Characterization And Evaluation Of A Functionally Graded Ai - 4.6% Cu Alloy." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/183.

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In some applications the stress across the entire cross-section of a component is not uniform but varies with position. For example, maximum shear stress is highest at the inner surface of a thick-walled cylinder subjected to uniform internal pressure and it decreases continuously towards the outer surface. In such applications it would be more appropriate for the component, too, to have varying strength across the cross-section matching with the stress profile it is subjected to. The present work deals with obtaining such a functionally graded material (FGM), characterizing it and testing its
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11

Kosker, Sadik. "Three Dimensional Mixed Mode Fracture Analysis Of Functionally Graded Materials." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608795/index.pdf.

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The main objective of this study is to model and analyze a three dimensional inclined semi-elliptic surface crack in a Functionally Graded Material (FGM) coating bonded to a homogeneous substrate with a bond coat. The parametric analyses on FGMs are based upon zirconia-yttria (ZrO2-8wt%-Y2O3) FGM coating bonded to a substrate made of a nickel-based superalloy. It is assumed that there is a nickel-chromium&amp<br>#8211<br>aluminum&amp<br>#8211<br>zirconium (NiCrAlY) bond coat between the FGM coating and substrate. Metal-rich, linear variation, ceramic-rich and homogeneous ceramic FGM coating ty
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12

Kose, Ayse. "Thermal Stress Problem For An Fgm Strip Containing Periodic Cracks." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615697/index.pdf.

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In this study the plane linear elastic problem of a functionally graded layer which contains periodic cracks is considered. The main objective of this study is to determine the thermal stress intensity factors for edge cracks. In order to find an analytic solution, Young&rsquo<br>s modulus and thermal conductivity are assumed to be varying exponentially across the thickness, whereas Poisson ratio and thermal diffusivity are taken as constant. First, one dimensional transient and steady state conduction problems are solved (heat flux being across the thickness) to determine the temperature dist
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13

Musuva, Mutinda. "The multiscale wavelet finite element method for structural dynamics." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/12468.

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The Wavelet Finite Element Method (WFEM) involves combining the versatile wavelet analysis with the classical Finite Element Method (FEM) by utilizing the wavelet scaling functions as interpolating functions; providing an alternative to the conventional polynomial interpolation functions used in classical FEM. Wavelet analysis as a tool applied in WFEM has grown in popularity over the past decade and a half and the WFEM has demonstrated potential prowess to overcome some difficulties and limitations of FEM. This is particular for problems with regions of the solution domain where the gradient
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14

Boidot, Mathieu. "Élaboration de revêtements γ-γ' et de systèmes barrière thermique par Spark Plasma Sintering : tenue au cyclage thermique et propriétés d’usage". Phd thesis, Toulouse, INPT, 2010. http://oatao.univ-toulouse.fr/11972/1/boidot.pdf.

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Les procédés existant pour la fabrication de sous-couches et de systèmes barrière thermique pour les aubes mobiles des turbomachines sont complexes, onéreux, et, de leur reproductibilité dépend la durée de vie de ces systèmes. Cette étude montre la faisabilité d'obtention de sous-couches γ-Ni + γ'-Ni3Al enrichies en platine et de systèmes barrière thermique complets, par l'utilisation du procédé de Spark Plasma Sintering (SPS). Les paramètres du procédé SPS (pression, durée, température et nombre de paliers) ont été ajustés afin de fabriquer les différents types de systèmes. Des améliorations
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15

Carbonari, Ronny Calixto. "Projeto de multi-atuadores piezelétricos homogêneos e gradados utilizando o método de otimização topológica." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/3/3152/tde-04102016-093909/.

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Microdispositivos piezelétricos tem uma vasta aplicação em mecânica de precisão, como, por exemplo, manipulação de células, microcirurgias, equipamentos de nanotecnologia e principalmente em microeletromecanismos (MEMS). Os microdispositivos piezelétricos considerados nesta tese essencialmente consistem de uma estrutura multi-flexível atuada por duas ou mais piezocerâmicas, que geram deslocamentos e forças em direções e regiões pré-determinadas do domínio, ou seja, a estrutura multi-flexível atua como um transformador mecânico amplificando e alterando os deslocamentos gerados pelas piezocerâmi
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16

Jackson, Todd Robert. "Analysis of functionally graded material object representation methods." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/9032.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2000.<br>Includes bibliographical references (leaves 218-224).<br>Solid Freeform Fabrication (SFF) processes have demonstrated the ability to produce parts with locally controlled composition. To exploit this potential, methods to represent and exchange parts with varying local composition need to be proposed and evaluated. In modeling such parts efficiently, any such method should provide a concise and accurate description of all of the relevant information about the part with minimal cost in terms of storage.
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17

Liu, Hongye 1970. "Algorithms for design and interrogation of functionally graded material solids." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/9044.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.<br>Includes bibliographical references (leaves 109-112).<br>A Functionally Gradient Material (FGM) part is a 3D solid object that has varied local material composition that is defined by a specifically designed function. Recently, research has been performed at MIT in order to exploit the potential of creating FGM parts using a modern fabrication process, 3D Printing, that has the capability of controlling composition to th
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18

Imery, Buiza Jesus Alberto. "Fracture behaviour of 2124 A1-SiC functionally graded materials." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321715.

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19

Janković, Ilić Dragana. "Self formed Cu-W functionally graded material created via powder segregation." Aachen Shaker, 2008. http://d-nb.info/999932683/34.

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Janković, Ilić Dragana. "Self formed Cu-W functionally graded material created via powder segregation." Aachen Shaker, 2007. http://d-nb.info/987900730/04.

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21

Garbin, Turpaud Fernando, and Pachas Ángel Alfredo Lévano. "Higher-order non-local finite element bending analysis of functionally graded." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2019. http://hdl.handle.net/10757/626024.

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La teoría de vigas de Timoshenko TBT y una teoría de alto orden IFSDT son formuladas utilizando las ecuaciones constitutivas no locales de Eringen. Se utilizaron ecuaciones constitutivas en 3D en el modelo IFSDT. Se utilizó una variación del material con el uso de materiales funcionalmente graduados a lo largo del peralte de una viga de sección rectangular. El principio de trabajos virtuales utilizado y ejemplos numéricos fueron presentados para comparar ambas teorías de vigas.<br>Timoshenko Beam Theory (TBT) and an Improved First Shear Deformation Theory (IFSDT) are reformulated using Eringen
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22

Tilbrook, Matthew Thomas Materials Science &amp Engineering Faculty of Science UNSW. "Fatigue crack propagation in functionally graded materials." Awarded by:University of New South Wales. Materials Science & Engineering, 2005. http://handle.unsw.edu.au/1959.4/21885.

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Propagation of cracks in functionally graded materials (FGMs) under cyclic loading was investigated via experiments and finite element (FE) analysis. Alumina-epoxy composites with an interpenetrating-network structure and tailored spatial variation in composition were produced via a multi-step infiltration technique. Compressed polyurethane foam was infiltrated with alumina slip. After foam burn-out and sintering, epoxy was infiltrated into the porous alumina body. Non-graded specimens with a range of compositions were produced, and elastic properties and fatigue behaviour were characterised.
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23

Limmahakhun, Sakkadech. "Development of functionally graded materials for innovation in bone-replacement applications." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/108053/2/Sakkadech_Limmahakhun_Thesis.pdf.

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This project aims to develop bone-mimic structures for bone-replacement applications. To mimic the complex structures observed in bones, various internal architectures and graded cellular microstructures were created using additive manufacturing approaches to tailor the mechanical performance of polymer and metal based scaffolds. The structure-property relation, stress shielding effect and cell response were investigated using experimental and numerical methods, at different material length scales. The optimized architectures and graded microstructures were applied to femoral implants whose pe
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24

Lindsay, Marianne Rose. "Development of Lithium Disilicate Microstructure Graded Glass-Ceramic." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/33243.

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The goal of this research was to create a microstructure graded glass-ceramic and investigate the resulting properties as a function of crystallization processing. The desired glass-ceramic was a lithium disilicate material that has a crystallization gradient across the sample, leading to functionally graded properties as a result of the microstructure gradient. Samples were prepared by melting and pouring glass at 1400°C, annealing at 400°C for 48 hours, and nucleating at 480°C for 2 hours. To ensure that crystallization would not occur homogeneously throughout the sample, a temperature gr
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25

Pratapa, Suminar. "Synthesis and character of a functionally-graded aluminium titanate/zirconia-alumina composite." Thesis, Curtin University, 1997. http://hdl.handle.net/20.500.11937/988.

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A functionally-graded Al(subscript)2TiO(subscript)5/ZrO(subscript)2-Al(subscript)2O(subscript)3 (AT/zirconia-alumina) composite has been successfully synthesized by an infiltration process involving an alpha-Al(subscript)2O(subscript)3-ZrO(subscript)2 (90:10 by weight) green body and a solution containing titanium chloride. The mass gain after infiltration has been used to estimate the amount of new phase introduced into the system. The phase composition character of the functionally-graded material (FGM) has been determined by x-ray diffraction. The Rietveld "whole pattern" refinement method
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Janković, Ilić Dragana [Verfasser]. "Self formed Cu-W functionally graded material created via powder segregation / Dragana Janković Ilić." Aachen : Shaker, 2008. http://d-nb.info/999932683/34.

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27

Pitakthapanaphong, Sasithon. "Deformation behaviour and failure predictions of multi-layered systems with a functionally graded material." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246987.

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28

Ilhan, Kucuk Ayse. "Mixed-mode Fracture Analysis Of Orthotropic Fgm Coatings Under Mechanical And Thermal Loads." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608743/index.pdf.

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In this study, it is aimed to investigate the mixed-mode fracture behavior of orthotropic functionally graded material (FGM) coatings bonded to a homogeneous substrate through a homogeneous bond-coat. Analytical and computational methods are used to solve the embedded cracking problems under mechanical or thermal loading conditions. It is assumed that the material property gradation of the FGM coating is in the thickness direction and cracks are parallel to the boundaries. The principal axes of orthotropy are parallel and perpendicular to the boundaries. A single embedded crack in the orthotro
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29

Koppanooru, Sampat Kumar Reddy. "Estimating Thermal Conductivity and Volumetric Specific Heat of a Functionally Graded Material using Photothermal Radiometry." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1062896/.

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Functionally graded materials (FGMs) are inhomogeneous materials in which the material properties vary with respect to space. Research has been done by scientific community in developing techniques like photothermal radiometry (PTR) to measure the thermal conductivity and volumetric heat capacity of FGMs. One of the problems involved in the technique is to solve the inverse problem, i.e., estimating the thermal properties after the frequency scan has been obtained. The present work involves finding the unknown thermal conductivity and volumetric heat capacity of the FGMs by using finite volume
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30

Caraballo, Simon. "Thermo-Mechanical Beam Element for Analyzing Stresses in Functionally Graded Materials." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3024.

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Modeling at the structural scale most often requires the use of beam and shell elements. This simplification reduces modeling complexity and computation requirements but sacrifices the accuracy of through-the-thickness information. Several studies have reported various design approaches for analyzing functionally graded material structures. One of these studies proposed a two-node beam element for functionally graded materials (FGMs) based on first order shear deformable (FOSD) theory. The derivation of governing equations included spatial temperature variation. However, only the constant temp
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31

Shi, Chao. "Finite Block Method and applications in engineering with Functional Graded Materials." Thesis, Queen Mary, University of London, 2018. http://qmro.qmul.ac.uk/xmlui/handle/123456789/39764.

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Fracture mechanics plays an important role in understanding the performance of all types of materials including Functionally Graded Materials (FGMs). Recently, FGMs have attracted the attention of various scholars and engineers around the world since its specific material properties can smoothly vary along the geometries. In this thesis, the Finite Block Method (FBM), based on a 1D differential matrix derived from the Lagrangian Interpolation Method, has been presented for the evaluation of the mechanical properties of FGMs on both static and dynamic analysis. Additionally, the coefficient dif
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32

Gokay, Kemal. "Contact Mechanics Of Graded Materials With Two Dimensional Material Property Variations." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606527/index.pdf.

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ABSTRACT CONTACT MECHANICS OF GRADED MATERIALS WITH TWODIMENSIONAL MATERIAL PROPERTY VARIATIONS G&ouml<br>kay, Kemal M.S., Department of Mechanical Engineering Supervisor: Asst. Prof. Dr. Serkan Dag September 2005, 62 pages Ceramic layers used as protective coatings in tribological applications are known to be prone to cracking and debonding due to their brittle nature. Recent experiments with functionally graded ceramics however show that these material systems are particularly useful in enhancing the resistance of a surface to tribological damage. This improved behavior is attributed to the
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33

Li, Qian. "Three-dimensional analysis of functionally graded material plates, free vibration in thermal environment and thermal buckling." Thesis, University of Macau, 2008. http://umaclib3.umac.mo/record=b1783646.

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34

Richards, Mark Rowse. "Process development for IrAl coated SiC-C functionally graded material for the oxidation protection of graphite /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/10574.

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35

Maruani, Jonas. "Contrôle actif des vibrations de structures élancées FGPM." Thesis, Paris 10, 2019. http://www.theses.fr/2019PA100062.

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Cette thèse vise à montrer la faisabilité et l’efficience du contrôle actif des vibrations des structures faites à partir de matériaux piézoélectriques à gradient de propriétés (FGPM). Une structure formée d’un seul bloc, fabriquée à partir d’un FGPM, intégrant directement les propriétés piézoélectriques permet de remplacer les structures classiques dites intelligentes (une structure hôte équipée de pastilles piézoélectriques) et de supprimer les inconvénients dont souffrent ces structures (concentrations de contraintes aux interfaces, décollement des pastilles, …). La recherche se concentre s
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36

Pratapa, Suminar. "Synthesis and character of a functionally-graded aluminium titanate/zirconia-alumina composite." Curtin University of Technology, Department of Applied Physics, 1997. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=14696.

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A functionally-graded Al(subscript)2TiO(subscript)5/ZrO(subscript)2-Al(subscript)2O(subscript)3 (AT/zirconia-alumina) composite has been successfully synthesized by an infiltration process involving an alpha-Al(subscript)2O(subscript)3-ZrO(subscript)2 (90:10 by weight) green body and a solution containing titanium chloride. The mass gain after infiltration has been used to estimate the amount of new phase introduced into the system. The phase composition character of the functionally-graded material (FGM) has been determined by x-ray diffraction. The Rietveld "whole pattern" refinement method
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37

Rodriguez, Johnnatan, Kevin Hoefer, Andre Haelsig, and Peter Mayr. "Functionally Graded SS 316L to Ni-Based Structures Produced by 3D Plasma Metal Deposition." MDPI AG, 2019. https://monarch.qucosa.de/id/qucosa%3A34781.

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In this investigation, the fabrication of functionally graded structures of SS316L to Ni-based alloys were studied, using the novel technique 3D plasma metal deposition. Two Ni-based alloys were used, a heat resistance alloy Ni80-20 and the solid-solution strengthened Ni625. Different configurations were analyzed, for the Ni80-20 a hard transition and a smooth transition with a region of 50% SS316L/50% Ni80-20. Regarding the structures with Ni625, a smooth transition configuration and variations in the heat input were applied. The effect of the process parameters on the geometry of the structu
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Fariborz, Jamshid. "Free Vibration of Bi-directional Functionally Graded Material Circular Beams using Shear Deformation Theory employing Logarithmic Function of Radius." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/85107.

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Curved beams such as arches find ubiquitous applications in civil, mechanical and aerospace engineering, e.g., stiffened floors, fuselage, railway compartments, and wind turbine blades. The analysis of free vibrations of curved structures plays a critical role in their design to avoid transient loads with dominant frequencies close to their natural frequencies. One way to increase their areas of applications and possibly make them lighter without sacrificing strength is to make them of Functionally Graded Materials (FGMs) that are composites with continuously varying material properties in o
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Demircivi, Bengi. "Thermal Stress Intensity Factor Evaluation For Inclined Cracks In Functionally Graded Materials Using Jk-integral Method." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607844/index.pdf.

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The main objective of this study is to evaluate mixed mode stress intensity factors for inclined embedded cracks in functionally graded materials. Fracture analysis of inclined cracks requires the calculation of both Mode I and Mode II stress intensity factors ( I K , II K ). In this study, k J -integral is used to calculate I K and II K . Equivalent domain integral approach is utilized to evaluate the k J - integral around the crack tip. The present study aims at developing a finite element model to study inclined crack problems in graded media under thermomechanical loading. A two dimensiona
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Arman, Eyup Erhan. "Jk-integral Formulation And Implementation For Thermally Loaded Orthotropic Functionally Graded Materials." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12610136/index.pdf.

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The main aim of this study is to utilize a Jk-integral based computational method in order to calculate crack tip parameters for orthotropic functionally graded materials (FGMs). The crack is subjected to mixed mode thermal loading. Mixed mode thermal fracture analysis requires the calculation of mode-I and mode-II stress intensity factors (KI ,KII ). In addition to stress intensity factors, energy release rate and T-stress are calculated by means of Jk-integral. Jk-integral is defined as a line integral over a vanishingly small curve. Since it is difficult to deal with a line integral on
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Lima, Andressa Bastos da Mota. "Desenvolvimento de eletrodo FGM a base de Ni-zircônia para célula a combustível de sólido óxido." Universidade Federal de São Carlos, 2007. https://repositorio.ufscar.br/handle/ufscar/760.

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Made available in DSpace on 2016-06-02T19:11:48Z (GMT). No. of bitstreams: 1 dissABML.pdf: 4339605 bytes, checksum: b2fcb2bbac41c9e9cc7c77720f7b0b4c (MD5) Previous issue date: 2007-03-01<br>Universidade Federal de Sao Carlos<br>The search for alternatives sources to fossil fuel has stimulated the technological development of solid oxide fuel cell. Hydrogen is the ideal fuel for this application. However, due to technical reasons, alternatives fuels to hydrogen such as methanol and natural gas has been tested. Therefore, the use of these fuels makes necessary the substitution of the anode mat
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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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Tedia, Saish. "Design, Analysis and Fabrication of Complex Structures using Voxel-based modeling for Additive Manufacturing." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/89524.

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A key advantage of Additive Manufacturing (AM) is the opportunity to design and fabricate complex structures that cannot be made via traditional means. However, this potential is significantly constrained by the use of a facet-based geometry representation (e.g., the STL and the AMF file formats); which do not contain any volumetric information and often, designing/slicing/printing complex geometries exceeds the computational power available to the designer and the AM system itself. To enable efficient design and fabrication of complex/multi-material complex structures, several algorithms are
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44

Amigo, Ricardo Cesare Román. "Otimização e fabricação de dispositivos piezelétricos com gradação funcional de material." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3152/tde-31072013-004337/.

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Cerâmicas piezelétricas possibilitam posicionamento e sensoriamento de precisão ou captação de energia mecânica valendo-se do efeito piezelétrico, capaz de converter energia mecânica em elétrica ou o contrário. Para aprimorar ou estender as aplicações dessas cerâmicas, mecanismos flexíveis podem ser acoplados a elas, formando um Dispositivo Piezelétrico Flextensional (DPF). No projeto desse tipo de estrutura, o conceito de Material com Gradação Funcional (MGF) é interessante, já que esses materiais apresentam variações graduais de suas propriedades efetivas, permitindo a alternância entre um m
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45

Uygur, Pelin. "Generalized Finite Differences For The Solution Of One Dimensional Elastic Plastic Problems Of Nonhomogeneous Materials." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608224/index.pdf.

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In this thesis, the Generalized Finite Difference (GFD) method is applied to analyze the elastoplastic deformation behavior of a long functionally graded (FGM) tube subjected to internal pressure. First, the method is explained in detail by considering the elastic response of a rotating FGM tube. Then, the pressurized tube problem is treated. A long FGM tube with fixed ends (axially constrained ends) is taken into consideration. The two cases in which the modulus of elasticity only and both the modulus of elasticity and the yield limit are graded properties are analyzed. The plastic model
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46

Stump, Fernando Viegas. "Otimização topológica aplicada ao projeto de estruturas tradicionais e estruturas com gradação funcional sujeitas a restrição de tensão." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3152/tde-22042007-230503/.

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Este trabalho apresenta a aplicação do Método de Otimização Topológica (MOT) considerando restrição de tensão mecânica em dois problemas de Engenharia: o projeto de estruturas mecânicas sujeitas a restrição de tensão e o projeto da distribuição de material em estruturas constituídas por Materiais com Gradação Funcional (MsGF). O MOT é um método numérico capaz de fornecer de forma automática o leiaute básico de uma estrutura mecânica para que esta atenda a um dado requisito de projeto, como o limite sobre a máxima tensão mecânica no componente. Os MsGF são materiais cujas propriedades variam gr
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47

Craveiro, Flávio Gabriel da Silva. "Automated multi-material fabrication of buildings." Doctoral thesis, Universidade de Lisboa, Faculdade de Arquitetura, 2020. http://hdl.handle.net/10400.5/20170.

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Tese de Doutoramento em Arquitetura, com a especialização em Desenho e Computação apresentada na Faculdade de Arquitetura da Universidade de Lisboa para obtenção do grau de Doutor.<br>Arquitetos e engenheiros estão sob crescente pressão para melhorar a eficiência e a eficácia do setor da arquitetura, engenharia e construção, de forma a reduzir o impacto ambiental, o uso de materiais e os custos. A eficiência de recursos, baseada numa estratégia de economia circular, considera um uso eficiente da energia, assim como dos recursos naturais e materiais. A integração de tecnologias digitais nos pro
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48

Yeilaghi, Tamijani Ali. "Vibration and Buckling Analysis of Unitized Structure Using Meshfree Method and Kriging Model." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/37817.

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The Element Free Galerkin (EFG) method, which is based on the Moving Least Squares (MLS) approximation, is developed here for vibration, buckling and static analysis of homogenous and FGM plate with curvilinear stiffeners. Numerical results for different stiffeners configurations and boundary conditions are presented. All results are verified using the commercial finite element software ANSYS® and other available results in literature. In addition, the vibration analysis of plates with curvilinear stiffeners is carried out using Ritz method. A 24 by 28 in. curvilinear stiffened panel was mac
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49

Thomas, Gareth James. "Advanced materials for plasma facing components in fusion devices." Thesis, University of Oxford, 2009. http://ora.ox.ac.uk/objects/uuid:f8ba1ae1-f303-4c32-877e-dca421a3cb5c.

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This thesis describes the design, manufacture and characterisation of thick vacuum plasma sprayed tungsten (W) coatings on steel substrates. Fusion is a potentially clean, sustainable, energy source in which nuclear energy is generated via the release of internal energy from nuclei. In order to fuse nuclei the Coulomb barrier must be breached - requiring extreme temperatures or pressures – akin to creating a ‘star in a box’. Tungsten is a promising candidate material for future fusion reactors due to a high sputtering threshold and melting temperature. However, the large coefficient of thermal
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50

Sahoo, Deepak Kumar. "Fabrication of Functionally Graded Material (FGM) Set-Up." Thesis, 2015. http://ethesis.nitrkl.ac.in/7697/1/2015_FABRICATION_Sahoo.pdf.

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Functionally graded materials (FGMs) are advanced composites with graded properties that are novel concepts in the structural design of materials and have extensive applications in the aerospace engineering, aircrafts and automotive industry. FGMs with the continuous variation of microstructures and properties are expected to have the reduction of residual and thermal stresses. In case of metal-ceramic FGMs advancement over heat and corrosion resistance of ceramics and mechanical strength of metals in such applications as thermal or chemical barriers. FGMs can also be designed to take.an impro
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