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Dissertations / Theses on the topic 'Mechanica'

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Published: 4 June 2021
Last updated: 4 March 2023

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1

Simeitis, Sven D. "Vergleich von Simulationen mittels Pro/MECHANICA und ANSYS." Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-68443.

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Gegenstand dieser Arbeit ist es, Simulationsergebnisse von Pro/MECHANICA und ANSYS zu vergleichen, um somit einen Hinweis auf die Qualität der Berechnungsergebnisse von integrierten FEM-Systemen zu bekommen. Als Beispiele dienen verschiedene Bauteile aus dem Gebiet der Strukturmechanik (linear-elastischer Bereich), welche mit Pro/MECHANICA und ANSYS modelliert und berechnet werden. Abschließend erfolgt eine Gegenüberstellung der Daten aus FEM und analytischer Rechnung, sowie eine Bewertung der Ergebnisse.
2

Stegemann, Patrick. "Untersuchung von Resonanzproblemen am MEYRA E-Rollstuhl 9506 Compact." Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-68411.

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Der Vortrag zeigt die einzelnen notwendigen Schritte auf, die zur Lösung des Resonanzproblems an der Vorderradaufhängung eines E-Rollstuhls der Firma MEYRA-ORTOPEDIA notwendig waren. Alle Lösungsschritte wurden mit Creo Elements/Pro und seinen Modulen Mechanism Design Option (MDO) und Advanced Mechanica erarbeitet.
3

Kloninger, Paul. "Top - Down Design eines universellen Kegelrollenlagermodells in Pro/MECHANICA." Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-68438.

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In dieser Präsentation wird das universelle FE-Modell eines Kegelrollenlagers vorgestellt. Mittels eines Pro/ENGINEER-Layouts, basierend auf dem Top-Down Designkonzept, kann automatisch innerhalb einer kurzen Bearbeitungszeit ein geprüftes und lauffähiges FE-Modell eines Kegelrollenlagers abgeleitet werden. Dieses Modell kann z.B. in großen Getriebemodellen eingebaut werden, um eine quasistatische Betrachtung mit korrekten Lagersteifigkeiten zu ermöglichen.
4

Kampen, Haedewych van. "Heideggers Dasein en de Mechanica van de levende Natuur /." Leiden : H. van Kampen, 2005. http://catalogue.bnf.fr/ark:/12148/cb412727611.

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5

Jakel, Roland. "Analysis of Hyperelastic Materials with Mechanica - Theory and Application Examples." Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000705.

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Part 1: Theoretic background information - Review of Hooke’s law for linear elastic materials - The strain energy density of linear elastic materials - Hyperelastic material - Material laws for hyperelastic materials - About selecting the material model and performing tests - Implementation of hyperelastic material laws in Mechanica - Defining hyperelastic material parameters in Mechanica - Test set-ups and specimen shapes of the supported material tests - The uniaxial compression test - Stress and strain definitions in the Mechanica LDA analysis Part 2: Application examples - A test specimen subjected to uniaxial loading - A volumetric compression test - A planar test - Influence of the material law Appendix - PTC Simulation Services Introduction - Dictionary Technical English-German
Teil 1: Theoretische Hintergrundinformation - Das Hookesche Gesetz für linear-elastische Werkstoffe - Die Dehnungsenergiedichte für linear-elastische Materialien - Hyperelastisches Material - Materialgesetze für Hyperelastizität - Auswählen des Materialgesetzes und Testdurchführung - Implementierung der hyperelastischen Materialgesetze in Mechanica - Definieren der hyperelastischen Materialparameter in Mechanica - Testaufbauten und Prüfkörper der unterstützten Materialtests - Der einachsige Druckversuch - Spannungs- und Dehnungsdefinition in der Mechanica-Analyse mit großen Verformungen Teil 2: Anwendungsbeispiele - Ein einachsig beanspruchter Prüfkörper - Ein volumetrischer Drucktest - Ein planarer Test - Einfluss des Materialgesetzes Anhang: - Kurzvorstellung der PTC Simulationsdienstleistungen - Wörterbuch technisches Englisch-Deutsch
6

Meyer, Torsten, Uwe Eiselt, Daniel Denninger, and Maik Berger. "Netzexport von Creo/Mechanica zu RecurDyn und Ergebnisverifikation am Beispiel." Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-87950.

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Zusammenfassung Herr Meyer: Mittels Creo/Mechanismus und Creo/Mechanica können Koppelgetriebestrukturen ganzheitlich simuliert und analysiert werden. Die ganzheitliche Getriebeauslegung [Ber08] in Creo weißt jedoch Funktionalitäten bedingte Grenzen bei der Analyse hochdynamischer Prozesse auf. Dem zufolge sind in Mechanica keine gekoppelten Mehrkörper- und FE-Simulationen möglich. Um die in RecurDyn vorhandenen Funktionalitäten zur gekoppelten Simulation auf ein bestehendes Creo- Modell [Den11] [Ber08] in guter Näherung zu verwenden, wurde eine verifizierte Methode entwickelt. Wesentliche Bestandteile dieser Herangehensweise sind die Implementierung des Koppelgetriebes in RecurDyn und die Konvertierung einer bestehenden Mechanica-Bauteilvernetzung. Die Bauteilvernetzung erfolgt über den Creo/Mechanica/FEM-Modus. Zu den möglichen Elementformen werden kurze Erläuterungen gegeben. Die Konvertierung erfolgt außerhalb eines FEM-Tools in ASCII-Files. Dies ermöglicht die Verwendung RecurDyns als "Addon" für Creo. Die Ergebnisverifikation wird mittels einer analytischen Gegenrechnung der Gelenkkräfte erreicht. Zum Abgleich der Spannungs- und Verschiebungsverläufe beider FEM-Tools wird vorab eine Definition der jeweils verwendeten p- und h-Methode gegeben. [Klo09]. Anhand einer beispielhaften Getriebestruktur werden Aufbau-, Simulations- und Analyse-Schritte dargestellt und Ergebnisse ausgewertet. Dabei wird im speziellen auf resultierende Spannungsunterschiede bei der FEM-Analyse im Zusammenhang mit der jeweiligen Vernetzungsmethode eingegangen [Reu10]. [Ber08] Berger, M.; Jakel, R.: Ganzheitliche Getriebeauslegung. - Darmstadt : PTC Anwendertreffen, 2008 [Den11] Berger, M.; Denninger, D.: Entwurf und Auslegung eines neuen nichtlinearen Antriebskonzeptes mittels Creo Elements/Pro; Saxsim 2011 [Klo09] Kloninger, P.: Pro/MECHANICA verstehen lernen: Ab Version Wildfire 4.0. - Springer, 2009 [Reu10] Reul, S.: Numerische Qualität von FEM-Analysen: Vergleich der h- und p-Methode, Vortrag 2. Norddeutsches Simulationsforum 2010 Zusammenfassung Herr Eiselt: Modellbildung ausgehend von ProE-Daten zur Gesamtsystemsimulation mit RecurDyn
7

Finck, Markus. "Festigkeitsberechnung von Maschinen aus der Hütten- und Walzwerkstechnik mit Pro/Mechanica." Universitätsbibliothek Chemnitz, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200900842.

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Gegenstand der vorliegenden Publikation sind Festigkeitsberechnungen von Maschinen aus der Hütten- und Walzwerkstechnik mit Pro/Mechanica. Erläutert werden die Arbeitstechniken, die bei der Aufbereitung der Modelle zum Einsatz kommen, sowie die genutzten Regelwerke für den Festigkeitsnachweis. Die angeführten Rechenbeispiele stammen allesamt aus der täglichen Praxis der industriellen Nutzung von FE-Methoden im Maschinenbau.
8

Kager, Wouter. "Conformally invariant paths in 2D statistical physics with a guide to Schramm-Löwner evolution /." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2006. http://dare.uva.nl/document/20362.

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9

Simmler, Urs. "Simulation-News in Creo 1.0." Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-68394.

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10

Jakel, Roland. "Das neue Kontaktmodell in Mechanica WF 4.0 mit Reibung : Theoretische Grundlagen und Anwendungsbeispiele." Universitätsbibliothek Chemnitz, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200900787.

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Der Vortrag stellt das neue, unendlich reibungsbehaftete Kontaktmodell der FEM-Berechnungssoftware Pro/ENGINEER Mechanica in der Version Wildfire 4.0 von PTC vor. Dabei werden sowohl die Grundlagen des reibungsfreien Kontaktes als auch die Theorie des unendlich reibungsbehafteten Kontaktmodells behandelt sowie die Grundlagen der zur numerischen Lösung in der Software verwendeten Penalty- und Newton-Raphson-Methode erläutert. Als Anwendungsbeispiel für das reibungsfreie Kontaktmodell wird ein Zylinderrollenlager vollständig mit sämtlichen Wälzkontakten für verschiedene Lager- und Einbauspiele berechnet, die Ergebnisse umfassend dargestellt sowie eine analytische Gegenrechnung nach der Hertzschen Theorie ausgeführt, die sehr gute Übereinstimmung mit der numerischen Simulation zeigt. Für das reibungsbehaftete Kontaktmodell wird exemplarisch eine geschrumpfte Welle-Nabe-Verbindung unter Torsion berechnet. Diese wird einer analytischen Lösung sowie verschiedenen 2D-Idealisierungen (ebener Spannungszustand, ebener Dehnungszustand, 2D-Axialsymmetrie) gegenübergestellt.
11

Jakel, Roland. "Berechnung von Schockspektren und praktische Anwendung der dynamischen Stoßanalyse in Creo Elements / Pro Mechanica." Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-68407.

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Der Vortrag stellt Idee und Grundlagen der Berechnung von Schockantwortspektren dar. Er zeigt, wie man exemplarisch für einen Halbsinusstoß das Schockantwortspektrum in der PTC FEM-Software Creo Elements / Pro Mechanica berechnen kann. Die Schockantworten eines Ein- und Zweimassenschwingers werden sowohl zeitaufgelöst als auch über die dynamische Stoßanalyse berechnet. Die modalen Superpositionsmethoden "Absolute Summe" und "SRSS" (Square Root of the Sum of the Squares - geometrischer Mittelwert) werden vorgestellt. Als reales Beispiel werden Schockanalysen für verschiedene Halbsinusimpulse mit einem Wärmebildgerät der Firma Carl Zeiss Optronics GmbH durchgeführt und mit einer zeitaufgelösten Analyse verglichen. Abschließend wird auf die Erzeugung von Antwortspektren für die Substrukturauslegung eingegangen
The presentation explains idea and fundamentals of shock response spectra analysis. With help of the PTC FEM-software Creo Elements / Pro Mechanica the shock response spectra (SRS) for an exemplary half sine shock is calculated. The shock response of a one-mass and a two-mass oscillator are analyzed per dynamic time as well as per dynamic shock analysis. The modal superposition methods "absolute sum" and "SRSS" (Square Root of the Sum of the Squares) are explained. The method is applied for different half sine shocks on a realistic example: A thermal imaging system of the company Carl Zeiss Optronics GmbH. Finally, the creation of response spectra for global-local analysis is explained
12

Svensson, Erik, and Tero Viitala. "FEM- analys av standardräls BJV50 : Undersökning av belastningsfall vid vägning av malmvagn UID II." Thesis, University of Skövde, School of Technology and Society, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-111.

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Då godsvagnar skall vägas med trådtöjningsgivare monterade i järnvägsräls finns ett antal faktorer som inverkar på mätresultatet. Denna rapport utreder genom datorbaserade simuleringar hur underlag och hastighet inverkar på töjningen i rälsen och även i viss mån hur deformationen i rälsen påverkas. Vidare utreds hur störningar i form av temperaturförändring samt förändring av kontaktkraften mellan vagnshjul och räls inverkar på töjningen. Förändringen av kontaktkraften kan exempelvis bero på hjulplatta, vibrationer från godsvagn eller ojämnheter i rälsen.


When goods wagons are weighed out with a strain gage assembled to a rail there are certain factors that affect the results of the measurement. This report investigates by computer based simulations how the foundation and the speed of a wagon affect the strain and the deformation of a rail. Furthermore, in the report investigations are made how disturbances in the form of changes in temperature and changes of the contact force between the wheel of a wagon and the rail affect strain. The changes can occur due to non-round wheels, vibrations of a wagon or irregular rail.

13

Lemmens, Philippe Luc Marie-Louise. "Clinical and mechanical aspects of bulk fracture of amalgam restorations Klinische en mechanische aspekten van bulk frakturen van amalgaamrestauraties /." Leuven : Drukkerij Acco, 1988. http://books.google.com/books?id=4MtpAAAAMAAJ.

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Thesis (doctoral)--Katholieke Universiteit te Nijmegen, 1988.
Text in English with a summary in Dutch. "Een wetenschappelijke proeve op het gebied van geneeskunde en tandheelkunde." Includes bibliographical references.
14

Vegt, Onno Martinus de. "Jet milling from a particle perspective predicting particle fracture based on mechanical material properties /." [S.l. : Groningen : s.n. ; University Library Groningen] [Host], 2007. http://irs.ub.rug.nl/ppn/304594458.

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15

Hermann, Konstantin. "Der Bestand "Mechanica" der Kurfürstlichen und Königlichen Bibliothek Dresden von 1556 bis 1918 : eine kulturgeschichtliche Studie der Erwerbungswege und Motivationen /." Berlin : Logos-Verl, 2008. http://deposit.d-nb.de/cgi-bin/dokserv?id=3081417&prov=M&dok_var=1&dok_ext=htm.

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16

Hermann, Konstantin. "Der Bestand "Mechanica" der kurfürstlichen und königlichen Bibliothek Dresden von 1556 bis 1918 eine kulturgeschichtliche Studie der Erwerbungswege und Motivationen." Berlin Logos, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=3081417&prov=M&dok_var=1&dok_ext=htm.

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17

Reul, Stefan. "Simulation von Lagern - Vergleiche -." Universitätsbibliothek Chemnitz, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200900796.

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- Allgemeine Problematik bei der FEM-Simulation von Lagern/Gelenken - Modellierungstechniken in MECHANICA wie z.B. Kontakt-Analysen, Balkenspinnen, gewichtete Verbindungen, orthotropes Material, etc. - Vergleich dieser Techniken und Diskussion der Vor- und Nachteile anhand eines Gleitlagers - Empfehlungen und Regeln
18

Denninger, Daniel, Maik Berger, and Andreas Heine. "Entwurf und Auslegung eines neuen nichtlinearen Antriebskonzeptes mittels Creo™ Elements/Pro™." Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-68450.

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- ganzheitliche Getriebeauslegung mit Hilfe von Mathcad, Creo™ Elements/Pro™ und MOCAD - Konkretisierung der Problemstellung beim Rundflechten und Ableiten von Bewegungsanforderungen an die Getriebestruktur - Strukturauswahl und Synthese mit Motion-Skelett in Creo™ Elements/Pro™ und Mathcad - MOCAD - MOtion and CAm-Design ist ein universell einsetzbares Werkzeug zum Bewegungsdesign und zur Auslegung von Kurvengetrieben - MOCAD wird zur Bearbeitung von Forschungs- und Industrieprojekten eingesetzt und mit Kooperationspartnern weiterentwickelt - Integrierte FEM-Analyse von Getriebestrukturen und Einzelteilen - Test des neuen Mechanica Features "Gelenkverbindungen"
19

Legat, Philipp. "Simulationsgestützte Beurteilung der Dauerfestigkeit einer Förderschnecke für die Pellet-Dosiereinrichtung eines Blockheizkraftwerkes." Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-87924.

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20

Marcucci, Lorenzo. "A mechanical model of muscle mechanics." Phd thesis, Ecole Polytechnique X, 2009. http://pastel.archives-ouvertes.fr/pastel-00004880.

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21

Matek, Christian C. A. "Statistical mechanics of nucleic acids under mechanical stress." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:ce44cf50-2001-4f54-8e57-d1757f709fd6.

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In this thesis, the response of DNA and RNA to linear and torsional mechanical stress is studied using coarse-grained models. Inspired by single-molecule assays developed over the last two decades, the end-to-end extension, buckling and torque response behaviour of the stressed molecules is probed under conditions similar to experimentally used setups. Direct comparison with experimental data yields excellent agreement for many conditions. Results from coarse-grained simulations are also compared to the predictions of continuum models of linear polymer elasticity. A state diagram for supercoiled DNA as a function of twist and tension is determined. A novel confomational state of mechanically stressed DNA is proposed, consisting of a plectonemic structure with a denaturation bubble localized in its end-loop. The interconversion between this novel state and other, known structural motifs of supercoiled DNA is studied in detail. In particular, the influence of sequence properties on the novel state is investigated. Several possible implications for supercoiled DNA structures in vivo are discussed. Furthermore, the dynamical consequences of coupled denaturation and writhing are studied, and used to explain observations from recent single molecule experiments of DNA strand dynamics. Finally, the denaturation behaviour, topology and dynamics of short DNA minicircles is studies using coarse-grained simulations. Long-range interactions in the denaturation behaviour of the system are observed. These are induced by the topology of the system, and are consistent with results from recent molecular imaging studies. The results from coarse-grained simulations are related to modelling of the same system in all-atom simulations and a local denaturation model of DNA, yielding insight into the applicability of these different modelling approaches to study different processes in nucleic acids.
22

Porro, Cristina Shino. "Quantum mechanical/molecular mechanics studies of Cytochrome P450BM3." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/quantum-mechanical--molecular-mechanics-studies-of-cytochrome-p450bm3(ad4255e7-b779-47a2-a2c5-8dbf6b603ca5).html.

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Cytochrome P450 (P450) enzymes are found in all kingdoms of life, catalysing a wide range of biosynthetic and metabolic processes. They are, in fact, of particular interest in a variety of applications such as the design of agents for the inhibition of a particular P450 to combat pathogens or the engineering of enzymes to produce a particular activity. Bacterial P450BM3 is of particular interest as it is a self-sufficient multi-domain protein with high reaction rates and a primary structure and function similar to mammalian isoforms. It is an attractive enzyme to study due to its potential for engineering catalysts with fast reaction rates which selectively produce molecules of high value.In order to study this enzyme in detail and characterise intermediate species and reactions, the first step was to design a general hybrid quantum mechanical /molecular mechanics (QM/MM) computational method for their investigation. Two QM/MM approaches were developed and tested against existing experimental and theoretical data and were then applied to subsequent investigations.The dissociation of water from the water-bound resting state was scrutinised to determine the nature of the spin conversion that occurs during this transformation. A displacement of merely 0.5 Å from the starting state was found to trigger spin crossing, with no requirement for the presence of a substrate or large conformational changes in the enzyme.A detailed investigation of the sulfoxidation reaction was undertaken to establish the nature of the oxidant species. Both reactions involving Compound 0 (Cpd0) and Compound I (CpdI) confirmed a concerted pathway proceeding via a single-state reactivity mechanism. As the reaction involving Cpd0 was found to be unrealistically high, the reaction proceeds preferentially via the quartet state of CpdI. This QM/MM study revealed that the preferred spin-state and the transition state structure for sulfoxidation are influenced by the protein environment. P450cam and P450BM3 were found to have CpdI species with different Fe-S distances and spin density distributions, and the latter having a larger reaction barrier for sulfoxidation.A novel P450 species, the doubly-reduced pentacoordinated system, was characterised using gas-phase and QM/MM methods. It was discovered to have a heme radical coupled to two unpaired electrons on the iron centre, making it the only P450 species to have similar characteristics to CpdI. Calculated spectroscopic parameters may assist experimentalists in the identification of the elusive CpdI.
23

Guillou, Lionel. "Cell Mechanics : Mechanical Properties and Membrane Rupture Criteria." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLX041/document.

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L’athérosclérose est une maladie artérielle chronique qui est une des causes majeures d’accidents vasculaires cérébraux et de crises cardiaques. Cette thèse a pour objectif de mieux comprendre certains facteurs spécifiques impliqués dans le dévelopement de cette maladie en abordant cette problématique sous l’angle de la mécanique.Deux types de cellules qui jouent un rôle important dans le dévelopement et la progression de l’athérosclérose sont les cellules endothéliales adhérentes et les leucocytes non-adhérents (les globules blancs). Nous avons développé deux systèmes capables de mesurer les propriétés mécaniques de ces deux grands types cellulaires. Le premier, appelé “indentation de profil”, utilise des micropipettes et des microindenteurs pour indenter la cellule, tandis que le second utilise la microfluidique pour soumettre les cellules à une contrainte d’élongation.De plus, nous nous sommes demandé si la mécanique pouvait nous aider à comprendre quand les déformations des cellules, ou les contraintes exercées sur elles, pouvaient les endommager.En effet, lorsque les plaques d’athérosclérose obstruent une partie trop grande du flux sanguin, le traitement le plus courant consiste à rouvrir le vaisseau avec un ballon et à le maintenir ouvert au moyen d’une endoprothèse artérielle, qui est un petit dispositif maillé et tubulaire. Cette procédure exerce des contraintes de compression considérables sur l’endothélium et l’endommage. Nous avons donc cherché à trouver un critère physique prédictif de la rupture de la membrane des cellules endothéliales en compression, puis avons comparé cela aux contraintes exercées sur l’endothélium durant la pose d’une endoprothèse artérielle, afin de voir si les dommages faits à l’endothélium pouvaient potentiellement être évités.De façon similaire, nous avons cherché à obtenir un critère physique prédictif de la rupture de la membrane des leucocytes. Nous avons ensuite comparé les déformations maximales possibles des leucocytes selon que ces déformations soient passives (comme lors du passage dans la microvasculature) ou actives (comme lors de la traversée de l’endothélium par les leucocytes)
Atherosclerosis is a chronic disease of the arteries that is a major cause of heart attacks and strokes. This thesis aims to provide novel insight into this disease by looking at specific factors involved in its development from a mechanical standpoint.Two important cell types involved in the development and progression of atherosclerosis are adherent endothelial cells and non-adherent leukocytes (white blood cells). We developed two devices that are able to measure the mechanical properties of both of these cell types. The first one, termed “profile microindentation”, uses micropipettes and microindenters to indent the cell, while the second one uses microfluidics to submit cells to an extensional stress.Further, we wondered if mechanics could help us understand when deformations undergone by cells, or stresses exerted on them, could become harmful.As a matter of fact, when atherosclerotic plaques occlude too much of the blood flow, the most common treatment consists of reopening the vessel with a balloon and keeping it open with a tubular wired mesh called a stent. This procedure exerts considerable compressive stress on the endothelium and is known to be associated with extensive endothelial damage. Hence, we seek to find a physical criterion that is predictive of endothelial cell membrane rupture under compression and to compare this to the stress exerted on the endothelium during the stenting procedure, to see if endothelial damage could potentially be avoided.Similarly, we seek to obtain a physical criterion that is predictive of leukocyte membrane rupture. We then compare and contrast the maximum possible deformations of leukocytes depending on whether those deformations are passive (such as when going through the microvasculature) or active (such as when leukocytes traverse the endothelial barrier)
24

Aurich, Mauren. "Simulação computacional do comportamento do concreto nas primeiras idades." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/3/3144/tde-22052009-122353/.

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O estudo do comportamento do concreto nas primeiras idades está se tornando cada vez mais importante, pois os efeitos térmicos e de retração do concreto, neste período inicial, geram fissuras, aumentando a permeabilidade das estruturas e podendo induzir problemas de durabilidade e funcionalidade das mesmas. Um detalhado estudo da evolução das tensões durante as primeiras idades pode ser decisivo para manter baixos os níveis de fissuração. Neste trabalho foi implementado um modelo computacional, baseado no método dos elementos finitos, para a simulação do comportamento de peças de concreto nas primeiras idades, tendo, em especial, o propósito de avaliar o potencial risco de fissuração. A análise por elementos finitos abrange a modelagem computacional dos fenômenos químicos, térmicos, de difusão de umidade e mecânicos que ocorrem nos primeiros dias após o lançamento do concreto. Na análise química é determinado o calor gerado pelas reações exotérmicas de hidratação do cimento. Na análise térmica o programa considera ainda o fluxo de calor devido à diferença de temperatura entre o corpo e o ambiente. Em função das propriedades térmicas e geométricas do corpo em estudo são determinadas as temperaturas nodais. Na seqüência, realiza-se a análise de difusão de umidade. Aproveitando a semelhança entre as equações que regem os fenômenos de transferência de calor e difusão de umidade, empregam-se os mesmos procedimentos da análise térmica para a determinação do valor nodal da umidade relativa dos poros. Na análise mecânica, por sua vez, são calculados os estados de tensões decorrentes das variações de temperatura e umidade determinadas nas etapas anteriores e dos fenômenos de retração e fluência do concreto. Quando o estado de tensão de determinado ponto de integração atinge a superfície de ruptura, o ponto passa a ser considerado fissurado. O programa considera a fissuração através de um modelo de fissuras distribuídas com fisssura fixa. Os resultados desta modelagem computacional foram comparados com valores experimentais encontrados na literatura, demonstrando excelente aproximação em todas as etapas de solução implementadas.
The study of the early age properties of concrete is becoming more important, because the thermal effects and the shrinkage, even in the first hours, could generate cracks, increasing the permeability of the structure and being able to induce problems of durability and functionality. The detailed study of the stresses development during the construction process can be decisive to keep low the cracking levels. In this work a computational model, based on the finite element method was implemented, to simulate the early age concrete behavior, having as a special feature, the evaluation of the cracking risk. The finite element analysis encloses the computational modeling of the following phenomena: chemical, thermal, diffusion and mechanical which occur at the first days after the concrete cast. In the chemical analysis, the heat generated by the exothermic reactions of cement hydration is evaluated. In the thermal analysis the program still considers the heat flow due to differences in temperatures between the body and the environment. Considering the thermal and geometric properties of the body, the nodal temperatures are determined. The following analysis is the humidity diffusion. Using the similarity between the equations that describe the phenomena of heat transfer and humidity diffusion, the same thermal analysis procedures are used to evaluate the pore relative humiditys nodal values. In the last analysis, mechanical, the stress states due to temperature and humidity variations, evaluated in the previous steps, and also due to shrinkage and creep are calculated. When the stress state in a determined sample point reaches the rupture surface, the point is considered cracked. The program evaluates cracking through a smeared fixed crack model. The developed software results were compared with experimental values found in the literature, demonstrating an excellent agreement for all the implemented analysis.
25

Dítě, Pavel. "OPTIMALIZACE ODLITKU ŠTÍTU ASYNCHRONNÍHO ELEKTROMOTORU." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228547.

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The subject of this diploma thesis is to optimize the shield of asynchronous motor. In the thesis are given results of modal and the strain-stress analysis made for model of the shield, which is currently produced. To resolve this issue was used CAE programming system Pro/MECHANICA, which is based on method of geometric elements – GEM. The main output of this work is proposal of two new optimized shields of asynchronous motor and for these are presented results of modal analyse and the strain-stress analysis. Part of the thesis is design and technical-economic evaluation of casting methods for new shield production.
26

Hara, Kousuke. "Mechanism of Phase Selection during Mechanical Milling." Kyoto University, 2011. http://hdl.handle.net/2433/142019.

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Miao, Yuyang. "Mechanics of textile composites : from geometry to mechanical properties /." Search for this dissertation online, 2005. http://wwwlib.umi.com/cr/ksu/main.

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Blackstone, Britani Nicole. "Biomaterial, Mechanical and Molecular Strategies to Control Skin Mechanics." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406123409.

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Liu, Guoning. "Application of fracture mechanics in electrical/mechanical failures of dielectrics /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?MECH%202006%20LIU.

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30

Jonsson, Anders. "Integral equation methods for fracture mechanics and micro-mechanical problems." Doctoral thesis, KTH, Solid Mechanics, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3336.

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31

Levert, Joseph Albert. "Interface mechanics of chemical mechanical polishing for integrated circuit planarization." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/15914.

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32

Lai, Jiun-Yu. "Mechanics, mechanisms, and modeling of the chemical mechanical polishing process." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8860.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.
Includes bibliographical references.
The ever-increasing demand for high-performance microelectronic devices has motivated the semiconductor industry to design and manufacture Ultra-Large-Scale Integrated (ULSI) circuits with smaller feature size, higher resolution, denser packing, and multi-layer interconnects. The ULSI technology places stringent demands on global planarity of the Interlevel Dielectric (ILD) layers. Compared with other planarization techniques, the Chemical Mechanical Polishing (CMP) process produces excellent local and global planarization at low cost. It is thus widely adopted for planarizing inter-level dielectric (silicon dioxide) layers. Moreover, CMP is a critical process for fabricating the Cu damascene patterns, low-k dielectrics, and shallow isolated trenches. The wide range of materials to be polished concurrently or sequentially, however, increases the complexity of CMP and necessitates an understanding of the process fundamentals for optimal process design. This thesis establishes a theoretical framework to relate the process parameters to the different wafer/pad contact modes to study the behavior of wafer-scale polishing. Several models of polishing - microcutting, brittle fracture, surface melting and burnishing - are reviewed. Blanket wafers coated with a wide range of materials are polished to verify the models. Plastic deformation is identified as the dominant mechanism of material removal in fine abrasive polishing.
(cont.) Additionally, contact mechanics models, which relate the pressure distribution to the pattern geometry and pad elastic properties, explain the die-scale variation of material removal rate (MRR) on pattern geometry. The pad displacement into low features of submicron lines is less than 0.1 nm. Hence the applied load is only carried by the high features, and the pressure on high features increases with the area fraction of interconnects. Experiments study the effects of pattern geometry on the rates of pattern planarization, oxide overpolishing and Cu dishing. It was observed that Cu dishing of submicron features is less than 20 nm and contributes less to surface non-uniformity than does oxide overpolishing. Finally, a novel in situ detection technique, based on the change of the reflectance of the patterned surface at different polishing stages, is developed to detect the process endpoint and minimize overpolishing. Models that employ light scattering theory and statistical treatment correlate the sampled reflectance with the surface topography and Cu area fraction for detecting the process regime and endpoint. The experimental results agree well with the endpoint detection schemes predicted by the models.
by Jiun-Yu Lai.
Ph.D.
33

Svantesson, Cecilia. "Respiratory mechanics during mechanical ventilation in health and in disease." Lund : Dept. of Clinical Psychology, Lund University, 1997. http://catalog.hathitrust.org/api/volumes/oclc/38987113.html.

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34

Lorenc, Petr. "Návrh konzoly přední nápravy Forterra." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227959.

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This thesis deals with construction proposal of front axle consoles for tractor Zetor Forterra. The aim of this work is to design and construct the 3D console model, which will be put through a solidity analysis. Based on this analysis the console will be optimized according to the solidity needs. The model proposal is realized in the software Pro/Engineer. Following strength calculations are realized in the software Pro/Mechanica.
35

Yue, Peng. "A micro mechanical study of critical state soil mechanics using DEM." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/38060/.

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One of the greatest breakthroughs in soil mechanics was the development of Critical State Soil Mechanics (CSSM) in the 1950s and 1960s and the derivation of a continuum elasto-plastic constitutive model, namely Cam clay, which was the foundation for other continuum models for clays, and much later for sands. However, as yet there has been no micro mechanical analysis which explains the existence of such continuum models; such a micro perspective must take into account the discontinuous nature of soil. Without such insight, the engineer cannot understand which micro parameters affect soil behaviour. This work uses the discrete element method (DEM) to model a silica sand as a sample of discrete particles, with properties which have been calibrated against experimental data in previous work, to build up a micro mechanical picture of the behaviour of sand under different loading conditions. The simplest of loading conditions is the one dimensional or oedometer test and has been modelled to check whether this agrees with previously published research. The simulated sample has then been subjected to isotropic compression to establish a normal compression line in log voids ratio – log stress space, and which turns out to be parallel to the one-dimensional normal compression line, in agreement with CSSM. The evolution of the isotropic normal compression line is due to local shear stresses within the sample, and the origin of the existence of both lines lies in the evolution of a fractal distribution of particles with a fractal dimension of 2.5. The effect of boundary particles has then been minimised by choosing an appropriate aspect ratio and a smaller number of particles in the sample to give a computational time which is acceptable for subsequent shearing to critical states. Isotropically normally compressed samples have been unloaded to different stress levels and sheared to critical states. A unique critical state line (CSL) exists at high stress levels, which is parallel to the normal compression lines, in agreement with CSSM. At low stress levels, the CSL is not linear and is non-unique; that is to say it is a function of preconsolidation pressure because the fractal distribution of sizes has not fully evolved. Samples sheared on the dense side of critical dilate and have a peak strength whilst loose samples exhibit ductile contraction, in agreement with CSSM. At a critical state, the work shows that crushing continues in the formation of ‘fines’, small particles with smaller than 0.1mm dimensions, which plays no part in the mechanical behaviour, which is reflected in the average mechanical co-ordination number and which means that plastic hardening can be assumed to have ceased at a critical state. For the isotropically overconsolidated samples sheared to critical states, a number of different definitions of yield have been used to establish a yield surface in stress space. The work shows that a previously published yield surface for sand (Yu, 1998; McDowell, 2002) gives a good representation of the behaviour, and it has therefore been shown that the sample of discrete particles has been shown to give rise to observed continuum behaviour. The work is, to the author’s knowledge, the first that has shown a DEM soil to show many of the desirable features of sand, in that the sample qualitatively gives normal compression lines and a CSL of the correct slope, which obeys CSSM and which gives a Cam Clay type yield surface in stress space. The work means that the established model can be used in the study of other micro mechanics problems such as particle shape and time effects and the application of DEM to boundary value problems directly.
36

Zhang, Qiuting. "Mechanics and Functionality of Extreme Mechanical Instabilities through Buckling Driven Delamination." Diss., Temple University Libraries, 2019. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/587760.

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Mechanical Engineering
Ph.D.
Mechanical instabilities such as wrinkling and buckling-driven delamination in thin film-substrate systems have historically been considered as one of structural failure mechanisms, which should be avoided. The past decade has witnesssed rapid growth in harnessing such surface instabilities for a wide range of tunable surface related properties and functionalities, especially in soft materials on small scales. Compared to extensively studied wrinkling on soft substrates and localized buckling driven delamination on stiff substrates, the fundamental mechanics underpinning ordered buckle-delamination on soft substrate over large area and its guidance for potential implications in engineering innovation remain largely to be explored. This thesis aims to partially bridging such a knowledge gap. In this thesis, I exploit how to generate the controllable and globally periodic delaminated buckling patterns in thin films on highly prestrained elastomeric substrates, and then explore the fundamental mechanics of this spontaneous extreme buckling driven periodic delamination, as well as its implications in design of extremely stretchable electronics and interfacial mechanical properties measurement. Compared to wrinkling, one of the benefits of extremely buckling driven delamination is the extraordinarily high aspect ratio of buckles. The large surface roughness and high local curvature could potentially enable extreme surface topographies related properties, such as adhesion, wetting, friction, and optics, as well as augment the extreme stretchability in stretchable optical and electronic devices. In the aim of harnessing this extreme buckling driven delamination, I first explore the formation and evolution of extraordinarily high-aspect-ratio delaminated buckles of thin films on 400% pre-strained elastomers, as well as uncovered the underlying deformation mechanism through combining quantitative theoretical analysis and experimental and numerical approaches. A theoretical framework is developed to describe the formation and evolution process of periodic delaminated buckles, which includes three deformation stages, i.e. onset of localized blisters (Stage I), growth and propagation of delamination (Stage II), and post-buckling after delamination arrest (Stage III). I show that under extreme large compressive strain, the profile of periodic blisters changes from sinusoidal shape to jig-saw-like shape with relative high aspect ratio, which have potential applications for design of extremely stretchable electronics. Equipped with the fundamental mechanics of buckle-delamination in thin films, I then exploit harnessing the spontaneous buckling driven periodic delamination to achieve high stretchability in both metal and silicon films. Experimentally I observe periodic buckle-delaminated patterns over large area, accompanied by highly ordered transversely cracking patterns, which can be theoretically predicted by simple crack fragments model. I hypothesize that when the width of ribbons is set to be equal or smaller than the theoretically predicted crack fragment width, there would be no cracking fragmentation. This criteria for designing crack-free micro-ribbons is further validated by related experiments. Guided by the validated criteria, I successfully design crack-free and spontaneous delaminated ribbons on highly prestrained elastomer substrates, which provides a high stretchability of about 120% and 400% in Si and Au ribbons, respectively. I further extend the buckling instability-based metrology to systematically measure the mechanical properties of 2D organic conjugated polymer nano-films, which have tremendous promising applications in organic integrated circuits, solar cells, and stretchable devices. I develop a new fabrication strategy to generate buckle-delaminated free-standing organic conjugated polymeric (P3BT/C60) nanosheets. Through both experiments and theoretical analysis, I show that the free-standing buckle-delaminated organic P3BT/C60 nanosheets have significant advantages over the traditional spin-coated wrinkled nanosheets, including the enhanced mechanical properties, a higher level of stretchability with lower electrical resistance, and a wider range of controllable wettability modulation.
Temple University--Theses
37

LEITE, DOUGLAS W. "Obtencao do cermet Ni-ZrOsub(2) por moagem de alta energia." reponame:Repositório Institucional do IPEN, 2010. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9497.

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Made available in DSpace on 2014-10-09T12:27:20Z (GMT). No. of bitstreams: 0
Made available in DSpace on 2014-10-09T13:59:14Z (GMT). No. of bitstreams: 0
Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
38

Garguilo, Keith Francis. "Design and testing of a nonlinear mechanical advantage demonstration mechanism." Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-03242009-040330/.

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39

Simmler, Urs. "Simulationslösungen in Pro/ENGINEER." Universitätsbibliothek Chemnitz, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200900758.

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Im Vortrag werden alle derzeit bestehenden Simulations-Werkzeuge im Überblick vorgestellt und deren Anwendung an einzelnen Beispielen verdeutlicht. Desweiteren beinhaltet der Beitrag die Vorstellung der wesentlichen Neuerungen der Pro/ENGINEER Version Wildfire 5 auf dem Gebiet Simulation. Dabei wird auf die Dynamische Analyse und die Erweiterungen in Mechanica besonders eingegangen.
40

Merz, Jürgen, and Jochen Münker. "Berechnungen im Walzwerksbau." Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-87172.

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Zusammenfassung Herr Merz: - Auf Basis von gerechneten Stützstellen können beliebige Flachzapfengeometrien innerhalb des Stützbereichs über den Ansatz {Durchmesser^3} umgerechnet werden. - Einfaches und schnelles Programm zur Bestimmung der Vergleichsspannung im Übergang vom Flachzapfenquerschnitt auf Rundquerschnitt - Ergebnisse stimmen sehr gut mit FE-Analysen überein. Zusammenfassung Herr Münker: Ausgehend von einem 2D-FEM-Modell werden mit dem FEM-Programm MSC.Marc der Wärmeeintrag in eine Rolle sowie die transienten Temperatur- und Spannungsfelder berechnet. Anschließend werden vergleichende 2D-FEM-Berechnungen mit den Programmen Mechanica Thermal und Structure durchgeführt. Die Erweiterung auf 3D-FEM-Berechnungen und die Ermittlung der Wärmespannungen in der Rolle schließen den Vortrag ab.
41

Reul, Stefan. "Numerische Singularitäten bei FEM-Analysen." Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-87212.

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42

Szklarzewski, Veronica. "A mechanism for testing the torsional mechanics of origami-inspired hinges." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98760.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015.
Cataloged from PDF version of thesis.
Includes bibliographical references (page 29).
Folding 2-dimensional sheets into static and dynamic 3-dimensional structures has the potential to improve rate, cost, and flexibility in manufacturing. In order to explore origami-inspired design, a better understanding of the mechanics of the fold is needed. This is to create better mathematical models and design for particular stiffness and fatigue specifications. The purpose of this study is to create a desktop machine that enables the measurement of the torsional stiffness of folded hinges over a wide angular range and a large number of cycles. This machine was then used to test 100 and 140 lb papers with 4 and 14 scores for the crease. Each paper was tested for 10 cycles and stiffness calculated. It was shown that 40 lb papers have higher reaction forces than the 100 lb papers. Stiffness measurements were inconclusive due to possible bending in addition to the hinging. For the 200 cycle around a 2 g decrease can be seen from I cycle to 200 cycles.
by Veronica Szklarzewski.
S.B.
43

OKEYO, Kennedy Omondi. "Mechanical Regulatory Mechanism of Actin Cytoskeletal Structure Dynamics in Migrating Cells." 京都大学 (Kyoto University), 2010. http://hdl.handle.net/2433/120808.

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44

Kleinauskas, Marius. "Dviračio vairo statinio stiprumo ir standumo tyrimai." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2006. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2006~D_20060614_011209-33463.

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Kleinauskas M. Research of static strenght and rigidity for wheel of bicycle: Master there is of mechanical engineer/ research advisor S.Rimovskis; Šiauliai University, Technology Faculty, Mechanical Engineering Department. – 2006. – 37p. In the countries of world bicycle is not only a widely used commodity, means of transport, but an index of mode of life. This work analyses a very important part of bicycle construction – a wheel. Strength and rigidity analysis are made using analytical and numerical solving methods. The main purposes of solving are elastic stress distribution in the wheel and the maximum value of the residual deflection. The condition and magnitude of load were estimated according to standard DIN 97100. Received results show if the wheel exploitation reliability is good ant its parameters meet the requirements of standards. The aim of the research: to prepare the methods of bicycle wheel strength and rigidity analysis for researches. Using the programme package ANSYS, to make wheel construction FEM model and perform strength and rigidity numerical solving, estimating of elastic plastic loading conditions.
45

Vonderheide, Christopher M. "Laser velocimetric flow mapping and characterization of oil mist nozzles used for blade excitation in high cycle fatigue testing." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Sep%5FVonderheide.pdf.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, September 2005.
Thesis Advisor(s): Dr. Raymond Shreeve, Dr. Garth Hobson. Includes bibliographical references (p. 61). Also available online.
46

Fountoukidis, Evangelos. "Thermo-mechanical response of monolithic and NiTi shape memory alloy fiber reinforced Sn-3.8Ag-0.7Cu solder." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Sep%5FFountoukidis.pdf.

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47

Hosoglu, Selcuk. "Cellular automata an approach to wave propagation and fracture mechanics problems." Thesis, Monterey, Calif. : Naval Postgraduate School, 2006. http://bosun.nps.edu/uhtbin/hyperion.exe/06Dec%5FHosoglu.pdf.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, December 2006.
Thesis Advisor(s): Young W. Kwon. "December 2006." Includes bibliographical references (p. 63-64). Also available in print.
48

Betancourt, Arturo. "Computational study of the heat transfer and fluid structure of a shell and tube heat exchanger." Thesis, Florida Atlantic University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10172609.

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A common technique to improve the performance of shell and tube heat exchangers (STHE) is by redirecting the flow in the shell side with a series of baffles. A key aspect in this technique is to understand the interaction of the fluid dynamics and heat transfer. Computational fluid dynamics simulations and experiments were performed to analysis the 3-dimensional flow and heat transfer on the shell side of an STHE with and without baffles. Although, it was found that there was a small difference in the average exit temperature between the two cases, the heat transfer coefficient was locally enhanced in the baffled case due to flow structures. The flow in the unbaffled case was highly streamed, while for the baffled case the flow was a highly complex flow with vortex structures formed by the tip of the baffles, the tubes, and the interaction of flow with the shell wall.

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Barry, Matthew M. "Analytical and experimental studies of thermoelectric devices and materials." Thesis, University of Pittsburgh, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10183683.

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Interest in thermoelectric devices (TEDs) for waste-heat recovery applications has recently increased due to a growing global environmental consciousness and the potential economic benefits of increasing cycle efficiency. Unlike conventional waste-heat recovery systems like the organic Rankine cycle, TEDs are steady-state, scalable apparatus that directly convert a temperature difference into electricity using the Seebeck effect. The benefits of TEDS, namely steady-state operation and scalability, are often outweighed by their low performance in terms of thermal conversion efficiency and power output. To address the issue of poor device performance, this dissertation takes a multi-faceted approach focusing on device modeling, analysis and design and material processing.

First, a complete one-dimensional thermal resistance network is developed to analytically model a TED, including heat exchangers, support structures and thermal and electrical contact resistances. The purpose of analytical modeling is twofold: to introduce an optimization algorithm of the thermoelectric material geometry based upon the realized temperature difference to maximize thermal conversion efficiency and power output; and to identify areas within the conventional TED that can be restructured to allow for a greater temperature difference across the junction and hence increased performance. Additionally, this model incorporates a component on the numerical resolution of radiation view factors within a TED cavity to properly model radiation heat transfer. Results indicate that geometric optimization increases performance upwards of 30% and the hot-side ceramic diminishes realized temperature difference. The resulting analytical model is validated with published numerical and comparable analytical models, and serves as a basis for experimental studies.

Second, an integrated thermoelectric device is presented. The integrated TED is a restructured TED that eliminates the hot-side ceramic and directly incorporates the hot-side heat exchanger into the hot-side interconnector, reducing the thermal resistance between source and hot-side junction. A single-state and multi-stage pin-fin integrated TED are developed and tested experimentally, and the performance characteristics are shown for a wide range of operating fluid temperatures and flow rates. Due to the eliminated to thermal restriction, the integrated TED shows unique performance characteristics in comparison to conventional TED, indicating increased performance.

Finally, a grain-boundary engineering approach to material processing of bulk bismuth telluride (Bi2Te3) is presented. Using uniaxial compaction and sintering techniques, the preferred crystallographic orientation (PCO) and coherency of grains, respectively, are controlled. The effect of sintering temperature on thermoelectric properties, specifically Seebeck coefficient, thermal conductivity and electrical resistivity, are determined for samples which exhibited the highest PCO. It is shown the performance of bulk Bi2Te3 produced by the presented method is comparable to that of nano-structured materials, with a maximum figure of merit of 0.40 attained at 383 K.

50

Vaidya, Anirudha. "Load-Displacement Relations for an Edge-Cracked Beam with a Hysteretic Bilinear Cohesive Zone Model." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1408958644.

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