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Dissertations / Theses on the topic 'Thermal Expansion Coefficient'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Okada, Yoshio 1928. "The thermal expansion coefficient of polypropylene and related composites /." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56778.

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The variability of thermal expansion coefficients during the molding of plastics causes the development of frozen thermal stresses in the molded parts. Also, the distribution of thermal expansion coefficients of the material in the molded part plays an important role in controlling shrinkage and warpage. In turn, the distribution of linear thermal expansion coefficients (LTECs) depends on the distributions of crystallinity and orientation in the part. In the case of fibre reinforced polymers, the distributions of fibre concentration and orientation are also important.<br>In this project, a mod
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2

Sakyi-bekoe, Kwame Opare Schindler Anton K. "Assessment of the coefficient of thermal expansion of Alabama concrete." Auburn, Ala, 2008. http://hdl.handle.net/10415/1435.

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3

Kulkarni, Raghav Shrikant. "Characterization of carbon fibers: coefficient of thermal expansion and microstructure." Texas A&M University, 2004. http://hdl.handle.net/1969.1/3073.

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The focus of the research is to develop a consistent and repeatable method to evaluate the coefficient of thermal expansion (CTE) of carbon fibers at high temperatures. Accurate measurement of the CTE of carbon fibers is essential to understand and develop optimal processing procedures as well as computational simulations to predict properties and allowables for fiber-reinforced composites. The mismatch between the coefficient of thermal expansion of the fiber and the matrix has a profound impact on the development of residual stresses and the subsequent damage initiation and progression, pote
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4

Rassi, Erik Michael. "An inverse approach to coefficient of thermal expansion optimization in optical structures." Thesis, Montana State University, 2007. http://etd.lib.montana.edu/etd/2007/rassi/RassiE1207.pdf.

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5

Gutierrez, Emmanuel David Mercado. "Thermal expansion coefficient for a trapped Bose gas during phase transition." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-27102016-102903/.

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Ultra cold quantum gas is a convenient system to study fundamental questions of modern physics, such as phase transitions and critical phenomena. This master thesis is devoted to experimental investigation of the thermodynamics susceptibilities, such as the isothermal compressibility and the thermal expansion coefficient of a trapped Bose-Einstein condensate (BEC) of 87Rb atoms. The critical phenomena and the critical exponents across the transition can explain the behavior of the isothermal compressibility and the thermal expansion coefficient near the critical temperature TC. By employing th
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6

Hacker, Paul John. "A study of the coefficient of thermal expansion of nuclear graphites." Thesis, University of Bath, 2001. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341579.

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7

Maravola, Michael. "Low Coefficient of Thermal Expansion Composite Tooling Manufactured via Additive Manufacturing Technologies." Youngstown State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ysu154704993501967.

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8

PRISCO, LUCIANA PRATES. "SYNTHESIS OF AL2MO3O12 NANOMETRIC POWDERS FOR OPTIMIZATION OF BULK COEFFICIENT OF THERMAL EXPANSION." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2012. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=21439@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>A síntese de pós nanométricos do Al2Mo3O12 para otimização de seu coeficiente de expansão térmica na forma maciça tem como objetivo principal aproximar o comportamento térmico intrínseco e extrínseco do material. A expansão térmica intrinseca de escala atomica é medida por difração de raios-X a partir do aumento dos parametros de rede, por outro lado, a tecnica de dilatometria mede ambos os efeitos tanto intrinsecos quanto extrinsecos provenientes da microestrutura. Materiais
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9

Archer, Robert Joseph 1957. "Effects of spacial variation of the thermal coefficient of expansion on optical surfaces." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276887.

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The deformation of a mirror's optical surface due to a spacial variation of the coefficient of thermal expansion is examined. Four types of variations of the coefficient of thermal expansion are studied. These represent variations which result after typical manufacturing and/or fabrication processes. Equations describing the deformations resulting from the variations in the coefficient of thermal expansion are derived for some of the cases. Deformations due to more complex variations in the coefficient of thermal expansion are developed empirically using data generated by the finite-element me
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10

Neekhra, Siddharth. "A new mineralogical approach to predict coefficient of thermal expansion of aggregate and concrete." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1461.

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A new mineralogical approach is introduced to predict aggregate and concrete coefficient of thermal expansion (CoTE). Basically, a modeling approach is suggested based on the assumption that the CoTE of aggregate and concrete can be predicted from the CoTE of their constituent components. Volume percentage, CoTE and elastic modulus of each constituent mineral phase are considered as input for the aggregate CoTE model, whereas the same properties for coarse aggregate and mortar are considered for the concrete CoTE model. Methods have been formulated to calculate the mineral volume percentage fr
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11

Mather, Paul J. "Functionalisation and characterisation of carbon blacks and their incorporation into HDPE and EVA polymer matrices to form conducting composites." Thesis, University of Newcastle Upon Tyne, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287828.

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12

Vural, Irem. "Synthesis Of Zirconium Tungstate And Its Use In Composites With Tunable Thermal Expansion Coefficient." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12612973/index.pdf.

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Thermal mismatch between different components of a system could be sources of problems like residual stress induced cracking, thermal fatigue or even optical misalignment in certain high technology applications. Use of materials with tailored thermal expansion coefficient is a counter-measure to overcome such problems. With its negative thermal expansion coefficient zirconium tungstate (ZrW2O8) is a candidate component to be used in synthesis of composites with controlled thermal expansion coefficient (CTE). ZrW2O8 is typically produced by solid-state reaction between zirconium oxide and tung
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13

Drews, Aaron M. "Control of Thermal Expansion Coefficient of a Metal Powder Composite via Ceramic Nanofiber Reinforcement." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1248114951.

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14

Myers, Donald G. "Method for measurement of residual stress and coefficient of thermal expansion of laminated composites." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0003180.

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15

DINH, VAN QUY. "LOW THERMAL EXPANSION OF ELECTRODEPOSITED COPPER IN THROUGH SILICON VIAS." Kyoto University, 2020. http://hdl.handle.net/2433/253518.

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16

Karch, Matthias Ottmar. "Design and Manufacturing of Hierarchical Multi-Functional Materials Via High Resolution additive Manufacturing." Master's thesis, Virginia Tech, 2017. http://tuprints.ulb.tu-darmstadt.de/6788/1/Master_Thesis_Karch_Matthias_Ottmar.pdf.

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17

Uchimiya, Ronald. "Systems Engineering Analysis for Optimum Selection Protocol for Thermal Expansion Measurement of a Carbon Fiber Reinforced Composite Tube." Digital Commons at Loyola Marymount University and Loyola Law School, 2018. https://digitalcommons.lmu.edu/etd/322.

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A material’s Coefficient of Thermal Expansion (CTE) is a valuable physical property, particularly for structural fiber reinforced composites that are routinely used in satellite/aerospace applications. Satellite space structures are routinely designed with a high degree of dimensional and thermal stability. Designing and verifying for near zero CTE performance is a common design requirement. The CTE is routinely a physical property with known values for common materials. However, the strength, stiffness and CTE properties on a multi-ply graphite fiber reinforced laminate composite can be tailo
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18

Chamroune, Nabil. "Matériaux composites Aluminium/Carbone : architecture spécifique et propriétés thermiques adaptatives." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0140/document.

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Les matériaux composites à matrice métallique (CMM) sont actuellement étudiés pour être utilisés dans de nombreux domaines d’application. L’une des applications potentielles concerne leur utilisation en tant que drain thermique pour les modules de puissance. Pour cette application, deux conditions sont requises : une conductivité thermique (CT) élevée pour évacuer la chaleur générée par la puce électronique et un coefficient d’expansion thermique (CTE) proche du substrat céramique (2-8×10-6 /K) utilisé dans le module de puissance.Ainsi des matériaux composites à matrice aluminium (Al : CT de 2
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19

Stephens, Skylar Nicholas. "Analytical and Computational Micromechanics Analysis of the Effects of Interphase Regions, Orientation, and Clustering on the Effective Coefficient of Thermal Expansion of Carbon Nanotube-Polymer Nanocomposites." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23216.

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Analytic and computational micromechanics techniques based on the composite cylinders method and the finite element method, respectively, have been used to determine the effective coefficient of thermal expansion (CTE) of carbon nanotube-epoxy nanocomposites containing aligned nanotubes. Both techniques have been used in a parametric study of the influence of interphase stiffness and interphase CTE on the effective CTE of the nanocomposites.  For both the axial and transverse CTE of aligned nanotube nanocomposites with and without interphase regions, the computational and analytic micromechani
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20

Lankford, Maggie E. "Measurement of Thermo-Mechanical Properties of Co-Sputtered SiO2-Ta2O5 Thin Films." University of Dayton / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1627653071556618.

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21

Thomas, Benjamin. "Matériaux composites Argent/Carbone à propriétés thermiques adaptatives." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0140.

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Du fait leur conductivité thermique élevée, les matériaux composites à matrice métallique et renfort carbone possèdent un fort potentiel d’application pour la gestion thermique en électronique. Ces travaux présentent le développement d’un nouveau procédé pour la synthèse de matériaux composites Ag/rGO (argent / « reduced Graphene Oxide ») et Ag/GF (argent / « Graphite Flakes ») par métallurgie des poudres. Ce procédé, inspiré des méthodes de « molecular level mixing », permet d’obtenir des poudres composites Ag/rGO dans lesquelles les nano-renforts sont individualisés jusqu’à une concentration
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22

Alabarse, Frederico. "Amorphisation sous pression dans des aluminophosphates à coefficient de dilatation thermique négatif." Thesis, Montpellier 2, 2012. http://www.theses.fr/2012MON20237/document.

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L'objectif de ce travail concerne l'étude de l'amorphisation sous pression (PIA) dans des aluminophosphates, qui présentent des coefficients de expansion thermiques négatif (NTE). La synthèse de ces aluminophosphates, leur stabilité en température (dilatation) ainsi que leur comportement sous pression (amorphisationant) été étudiés. Les aluminophosphates choisis pour réaliser cette étude sont AlPO4-54, premier tamis moléculaire uniforme ayant des pores (unidimensionnelles parallèles à l'axe c) de diamètre supérieur à 1 nm, et AlPO4-17, qui présente une porosité tridimensionnelle et le plus for
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23

Brown, Timothy Lawrence Jr. "The Effect of Long-Term Thermal Cycling on the Microcracking Behavior and Dimensional Stability of Composite Materials." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/29832.

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The effect of thermal-cycling-induced microcracking in fiber-reinforced polymer matrix composites is studied. Specific attention is focused on microcrack density as a function of the number of thermal cycles, and the effect of microcracking on the dimensional stability of composite materials. Changes in laminate coefficient of thermal expansion (CTE) and laminate stiffness are of primary concern. Included in the study are materials containing four different Thornel fiber types: a PAN-based T50 fiber and three pitch-based fibers, P55, P75, and P120. The fiber stiffnesses range from 55 Msi to 12
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24

Alsulami, Uthman Eyad N. [Verfasser], and J. [Akademischer Betreuer] Geis-Gerstorfer. "Influence of the coefficient of thermal expansion mismatch on the bond strength of bi-layered all ceramic system / Uthman Eyad N. Alsulami ; Betreuer: J. Geis-Gerstorfer." Tübingen : Universitätsbibliothek Tübingen, 2014. http://d-nb.info/1196877696/34.

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25

Bano, Nafisa. "Neural Network Approach for Predicting the Failure of Turbine Components." Thesis, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24343.

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Turbine components operate under severe loading conditions and at high and varying temperatures that result in thermal stresses in the presence of temperature gradients created by hot gases and cooling air. Moreover, static and cyclic loads as well as the motion of rotating components create mechanical stresses. The combined effect of complex thermo-mechanical stresses promote nucleation and propagation of cracks that give rise to fatigue and creep failure of the turbine components. Therefore, the relationship between thermo-mechanical stresses, chemical composition, heat treatment, resulting
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26

Akentuna, Moses. "Laboratory Investigation of Low-Temperature Performance of Asphalt Mixtures." Ohio University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou150607781022331.

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27

Davis, Andrew Scott. "Temperature Induced Deflection of Yttria Stabilized Zirconia Membranes." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338369600.

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28

Lombardo, Nick, and e56481@ems rmit edu au. "Properties of Composites Containing Spherical Inclusions Surrounded by an Inhomogeneous Interphase Region." RMIT University. Mathematical and Geospatial Sciences, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080408.143315.

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The properties of composite materials in which spherical inclusions are embedded in a matrix of some kind, have been studied for many decades and many analytical models have been developed which measure these properties. There has been a steady progression in the complexity of models over the years, providing greater insight into the nature of these materials and improving the accuracy in the measurement of their properties. Some of the properties with which this thesis is concerned are, the elastic, thermal and electrical properties of such composites. The size of the spherical inclusion
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29

Rehder, Gustavo Pamplona. "Propriedades termo-mecânicas de filmes finos de a-SiC:H e SiOxNy e desenvolvimento de MEMS." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-09022009-162824/.

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O presente trabalho, realizado junto ao Grupo de Novos Materiais e Dispositivos (GNMD), no Laboratório de Microeletrônica do Departamento de Sistemas Eletrônicos da Escola Politécnica da USP, visou determinar algumas das propriedades termo-mecânicas de materiais depositados pela técnica de plasma enhanced chemical vapor deposition (PECVD) que são importantes para o desenvolvimento de sistemas microeletromecânicos (MEMS). O módulo de elasticidade, a tensão mecânica residual, o coeficiente de expansão térmica e a condutividade térmica de filmes finos de carbeto de silício amorfo hidrogenado (a-S
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30

Kašuba, Matúš. "Nadzvuková kinetická depozice vícefázových materiálů s redukovanou tepelnou roztažností." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400493.

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Cieľom predkladanej diplomovej práce je skúmať a analyzovať možnosti prispôsobovania koeficientu tepelnej rozťažnosti nástrekov z kompozitných materiálov deponovaných na substráty pomocou technológie cold spray. Kompozitné materiály sú v tomto prípade reprezentované zmiešanými práškami, ktoré sú pripravené pridávaním fázy s negatívnou tepelnou rozťažnosťou do základného materiálu s kladným koeficientom tepelnej rozťažnosti. Takto pripravené nástreky môžu byť užitočné pri opravovaní a renovácii strojárenských súčiastok. V prvej časti je priblížená samotná technológia cold spray spolu s jej využ
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31

Skácel, Josef. "Studie srovnání vlastností pouzder QFN a BGA." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221108.

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This work deals with the issue of packaging and heat transfer. Especially this work focused on QFN and BGA packages. Nowadays most sophisticated conventional solution. First part deals with analysis of the current status of packages. Next part is analyze the issue of heat transfer in electronic systems. The following section is an experimental dealing with simulation in ANSYS Workbench and validation of these simulations by designed test structures. At the end is evaluated properties and behavior of these packages.
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32

Shen, Zhengyan. "Elaboration, caractérisation et nouvelle architecture de matériaux composites Al/plaquettes de carbone pour des applications thermiques." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0268.

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Dans l'industrie microélectronique, l'augmentation constante de la densité de puissance due à la miniaturisation des composants électroniques nécessite un matériau de dissipation thermique ayant une conductivité thermique élevée (CT), un faible coefficient de dilatation thermique (CTE) et des propriétés mécaniques (PM) appropriées pour une dissipation efficace de la chaleur. Des métaux purs, tels que Al et Cu, ont déjà été utilisés. Cependant, ils ont des CT limitées (ex. 240 W/m.K pour Al) et leurs CTE sont trop élevés (ex. 23 10-6/K pour Al), ce qui est incompatible avec ceux des composants
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33

Pelletant, Aurelien. "Elaboration de matériaux composites céramiques à faible coefficient de dilatation thermique pour des applications spatiales." Thesis, Lyon, INSA, 2012. http://www.theses.fr/2012ISAL0018.

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Actuellement, la qualité de l’imagerie provenant de systèmes optiques spatiaux est limitée par la taille de leurs miroirs et la masse des structures supportant le miroir. Le développement de systèmes athermiques légers (un seul matériau) constitue le principal challenge dans l’amélioration de ces systèmes. De matériaux légers, résistants mécaniquement (E/ρ3 &gt; 10, σf &gt; 100 MPa) et stables thermiquement (&lt; 2,0.e-6/K) doivent être développés. Dans ce cadre, notre travail porte sur l’élaboration de composites céramiques associant un matériau à coefficient de dilatation thermique (CTE) pos
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34

Pritchard, Joshua D. "Design, Fabrication, and Analysis of a Multi-Layer, Low-Density, Thermally-Invariant Smart Composite via Ultrasonic Additive Manufacturing." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406284899.

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35

Milhans, Jacqueline Linda. "Microstructure-based solid oxide fuel cell seal design using statistical mechanics." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37188.

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Solid oxide fuel cells (SOFC) in a flat-plate configuration require a hermetic seal between the fuel and air sides of the electrodes, and this seal must withstand a variety of thermally-induced stresses over the lifetime of the cell. In this study, quantitative microstructure-property relationships are developed to predict optimum seal structures for mechanical properties and thermal expansion coefficient criteria. These relationships are used to create an inverse approach to characterizing the processing method from the desired microstructure. The main focus of the work concentrates on provi
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36

Osmanson, Allison Theresa. "Defining a Relationship between the Flexibility of Materials and Other Properties." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1157637/.

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Brittleness of a polymeric material has a direct relationship with the material's performance and furthermore shares an inverse relationship with that material's flexibility. The concept of flexibility of materials has been understood but merely explained with a hand-waving manner. Thus, it has never been defined by a calculation, thereby lacking the ability to determine a definite quantitative value for this characteristic. Herein, an equation is presented and proven which makes determining the value of flexibility possible. Such an equation could be used to predict a material's flexibility p
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37

Trupkovic, Alexandra. "Etude de verres borates de lithium utilisables dans les microbatteries : corrélation conductivité ionique / propriétés thermomécaniques." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2009. http://tel.archives-ouvertes.fr/tel-00659229.

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L'utilisation croissante de systèmes électroniques miniaturisés induit une forte demande en microsources d'énergie performantes, telles que les microbatteries au lithium. En vue d'améliorer les propriétés de l'électrolyte, nous avons étudié les propriétés électriques et thermomécaniques d'électrolytes solides de type borate de lithium. Une corrélation entre la conductivité ionique et le coefficient de dilatation thermique (CTE) a été mise en évidence pour différentes compositions de verres massifs. A partir des résultats de CTE obtenus, un modèle de prédiction basé sur les travaux de Appen per
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38

Veillere, Amélie Aurélie Mylène. "Drains thermiques adaptatifs : cuivre allié / Fibre de Carbone." Thesis, Bordeaux 1, 2009. http://www.theses.fr/2009BOR13835/document.

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Dans le domaine de l'électronique de puissance, la gestion thermique de l'intégration des puces en silicium au sein du système global constitue un problème clé. La chaleur dissipée par les composants électriques est évacuée vers l’extérieur à travers un drain thermique, généralement en cuivre, qui est brasé sur le substrat céramique. Cette étude est consacrée à l'élaboration de drains thermiques adaptatifs en matériaux composites cuivre allié/fibres de carbone (FC) qui combinent une bonne conductivité thermique et un CTE proche de celui du substrat. Dans ce type de matériau, la liaison interfa
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39

Shafeie, Samrand. "Properties in New Complex Perovskite-Related Materials, a Matter of Composition and Structure." Doctoral thesis, Stockholms universitet, Institutionen för material- och miljökemi (MMK), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-88793.

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This PhD thesis presents investigations of perovskite-related compounds in systems of interest for applications in components in solid oxide fuel cells. The compound compositions derive from substitutions in the parent compounds LaCoO3, LaCrO3 and SrFeO3. Novel phases La2Co1+z(MgxTi1-x)1-zO6 were synthesized and investigated with regard to structure, thermal expansion, electronic and magnetic properties. The study focused on the composition lines La2Co(MgxTi1-x)O6 (z=0), where the oxidation state of Co nominally changes from +2 (x=0.0) to +3 (x=0.5), and La2Co1+z(Mg0.5Ti0.5)1-zO6, with a varyi
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40

Gabertan, Michael Yandoc. "A comparison of woven fiber composite models to determine coefficients of thermal expansion." Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/17309.

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41

Ram, Gokul, and Vishnu Harikrishnan. "INFLUENCE OF CARBON CONTENT AND COOLING CONDITIONS ON THE THERMAL CONDUCTIVITY AND TENSILE STRENGTH OF HIGH SILICON LAMELLAR GRAPHITE IRON." Thesis, Tekniska Högskolan, JTH, Material och tillverkning, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-51152.

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Much study has been carried out to determine the properties of Lamellar Graphite Iron (LGI) or grey iron and their relations to factors such as the cooling rate, the dendrite morphology, the pouring temperature, and so on. However, there hasn’t been much comprehensive study on the properties of LGI outside the generally used and accepted composition, with 1 to 3% Silicon. The scope of this study is to measure and evaluate the thermal conductivity and tensile strength of LGI, for a higher concentration of  Si and different carbon contents. The concentration of Si aimed for was 4% but the concen
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42

Moulard, Gilles. "Développement d'une technique de mesure in situ de contraintes dans les couches minces : application à la mesure des contraintes intrinsèque et thermique." Saint-Etienne, 1997. http://www.theses.fr/1997STET4015.

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Le développement d'une technique de mesure in situ des contraintes dans les couches minces a fait l'objet de ce travail ; la finalité étant d'obtenir de plus amples informations sur les caractéristiques mécaniques et thermiques du film, et le développement des contraintes internes lors de sa formation. La technique permet de différencier expérimentalement les contraintes thermique et intrinsèque, cette dernière étant représentative de l'évolution des contraintes dans les films. Une méthode optique a été choisie pour son adaptation à tous les procédés de dépôt sous vide. La technique, basée sur
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Lalet, Grégory. "Composites aluminium/fibres de carbone pour l'électronique de puissance." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2010. http://tel.archives-ouvertes.fr/tel-00538480.

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L'étude a pour objectif l'amélioration de la fiabilité des assemblages électroniques à travers la mise en œuvre de drains composites aluminium/fibres de carbone. Le travail a consisté à 1) modéliser, par la méthode des éléments finis, l'influence des propriétés thermiques et mécaniques du matériau de semelle sur l'assemblage életronique ; 2) élaborer (par frittage sous charge uniaxiale, frittage flash et extrusion à chaud) des matériaux composites aluminium/fibres de carbone ; et 3) lier les microstructures observées aux paramètres des procédés d'élaboration ainsi qu'aux propriétés thermiques
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44

Bonner, J. K. "Kirk", and Silveira Carl de. "Thermal Cycling Fatigue Investigation of Surface Mounted Components with Eutectic Tin-Lead Solder Joints." International Foundation for Telemetering, 1996. http://hdl.handle.net/10150/611418.

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International Telemetering Conference Proceedings / October 28-31, 1996 / Town and Country Hotel and Convention Center, San Diego, California<br>Eutectic (63% tin-37% lead) or near-eutectic (40% tin-60% lead) tin-lead solder is widely used for creating electrical interconnections between the printed wiring board (PWB) and the components mounted on the board surface. For components mounted directly on the PWB mounting pads, that is, surface mounted components, the tin-lead solder also constitutes the mechanical interconnection. Eutectic solder has a melting point of 183°C (361°F). It is importa
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45

Troadec, Carole. "Composite à matrice métallique Al-AlN : de la poudre au matériau." Grenoble INPG, 1996. http://www.theses.fr/1996INPG4205.

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Cette etude s'inscrit dans le cadre de l'elaboration de composites a matrice metallique aluminium/nitrure d'aluminium, par metallurgie des poudres. Deux types de poudres sont utilisees: une poudre dite composite synthetisee par nitruration directe de l'aluminium par l'azote et une poudre dite melange obtenue a partir d'un melange de poudres commerciales elementaires aluminium et nitrure d'aluminium. Ces deux types de poudres subissent un broyage hautement energetique par melangeur planetaire sous argon, puis sont frittes par compression a chaud en phase solide. La microstructure de ces materia
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46

Daniel, Marcus. "Structural and Thermoelectric Properties of Binary and Ternary Skutterudite Thin Films." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-164319.

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Increasing interest in an effciency enhancement of existing energy sources led to an extended research in the field of thermoelectrics. Especially skutterudites with their high power factor (electric conductivity times Seebeck coefficient squared) are suitable thermoelectric materials. However, a further improvement of their thermoelectric properties is necessary. The relatively high thermal conductivity can be decreased by introducing loosely bound guest ions, whereas atom substitution or nanostructuring (as thin films) could yield an increased power factor. The present work proves the feasib
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Beránková, Karla. "Důsledky tvorby anortitu v keramickém střepu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225515.

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Anorthite is crystalline phase in the ceramic body. Is acquired on burning a mixture of calcium ceramic raw material. This work deals with the influence on the resulting properties of anorthite ceramic body, especially flexural strength, porosity, shrinkage, thermal expansion coefficient. And the influence of different CaO sources on the properties. As a source of CaO was used calcium carbonate, calcium hydroxide and fluid fly ash.
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CABRAS, LUIGI. "A new class of auxetic lattices." Doctoral thesis, Università degli Studi di Cagliari, 2015. http://hdl.handle.net/11584/266579.

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In this work we have studied the mechanical and thermal behavior of a new class of auxetic lattices. We have started introducing a novel two-dimensional lattice family with three different realizations that leads to a Poisson's ratio arbitrarily close to the thermodynamic limit corresponding to ν = -1. The effect is achieved by the superposition of clockwise and anti-clockwise internal rotations leading to a macroscopic non-chiral effect. We have detailed the kinematic of the mechanical system for three types of periodic lattices and we have determined analytically the macroscopic consti
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Troussaut-Bertrand, Francine. "Etude du KH2PO4 au voisinage du point tricritique : mesures de biréfringence sous pression et détermination des coefficients d'électrostriction." Grenoble 1, 1987. http://www.theses.fr/1987GRE10039.

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Mise en evidence de la possibilite d'etude des variations du parametre d'ordre, en fonction de la pression, de la temperature et du champ electrique, a partir de mesures de birefringence; confirmation de l'ordre de transition de rbh::(2)po::(4) et etude du diagramme de phases 3d de kh::(2)po::(4) au voisinage d'un point tricritique. Etude des proprietes electromecaniques de kh::(2)po::(4) par une nouvelle technique de diffraction simultanee neutron-gamma, dans le but de preciser la relation entre les variations du parametre d'ordre et les anomalies de la dilatation au voisinage de la transitio
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Wu, Kuei-Kuan, and 吳奎寬. "Designation of Thermal Expansion Coefficient Measuring System." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/84z797.

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碩士<br>國立東華大學<br>應用物理研究所<br>96<br>My main project is to setup a measuring system of CTE (Coefficient of Thermal Expansion). We take some designations of dilatometer, redesign the every part of the cell, fabricating parts, testing and calibration repeatedly. The measuring theory was base on the capacitance value of a pair parallel plate. How to take plates parallel and make the sample attach to the capacitance plate and sample platform is the main subject of my project. The hardware of thermal expansion coefficient measuring system consist of capacitance bridge, mechanical pump, turbo pump, te
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