Дисертації з теми "Elevated temperature"
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Cigas, Saulius. "Standaus apkrovimo ciklinių deformavimo parametrų nustatymas korozijai ir karščiui atsparaus plieno suvirintųjų sujungimų medžiagoms." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2005. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2005~D_20050613_152519-67955.
Повний текст джерелаKarademir, Tanay. "Elevated temperature effects on interface shear behavior." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42764.
Повний текст джерелаborgonovo, cecilia. "Aluminum Nano-composites for Elevated Temperature Applications." Digital WPI, 2010. https://digitalcommons.wpi.edu/etd-theses/962.
Повний текст джерелаLind, Jonna. "Tribology of polymer composites for elevated temperature applications." Licentiate thesis, Uppsala universitet, Tillämpad materialvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-332985.
Повний текст джерелаYang, Kwan-Ho. "Development of impact testing procedure at elevated temperature /." Thesis, Connect to this title online; UW restricted, 1988. http://hdl.handle.net/1773/7038.
Повний текст джерелаCretegny, Laurent. "Fracture toughness behavior of weldments at elevated temperature." Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/19957.
Повний текст джерелаPrzydatek, Jan. "The elevated temperature deformation of aluminium alloy 2650." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287577.
Повний текст джерелаTsembelis, Kostantinos. "Elevated temperature measurements during a hypervelocity impact process." Thesis, University of Kent, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285978.
Повний текст джерелаZhu, Cuiru. "Elevated temperature liquid chromatography and peak shape analysis." Thesis, University of York, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413172.
Повний текст джерелаRenshaw, Matthew Peter. "Magnetic resonance studies at elevated temperature and pressure." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709303.
Повний текст джерелаBraun, Eric. "Elevated temperature stability of gallium arsenide integrated circuits." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/38045.
Повний текст джерелаPoole, Eric L. "Durability of polymeric composites after elevated temperature aging /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/9963.
Повний текст джерелаChiu, Sing-Lok. "Behaviour of normally consolidated clay at elevated temperature." Thesis, The University of Sydney, 1996. http://hdl.handle.net/2123/18126.
Повний текст джерелаSchoech, Alexander. "Quality control of freeform parts at elevated temperature." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3424502.
Повний текст джерелаLe moderne industrie manifatturiere si trovano ad operare in una condizione di forte stress economico, ma allo stesso tempo con richieste dal mercato sempre più complesse. Ad esempio, se da un lato i processi produttivi aumentano la proprio complessità, dall’altro, le tolleranze richieste, le dimensioni dei lotti e il “time-to-market” si riducono sempre più. Questo andamento, per certi versi contradditorio, richiede l’adozione di processi produttivi sempre più sofisticati e tecniche avanzate per il controllo della qualità e del processo. L’obbiettivo di questo lavoro è di analizzare, in un processo produttivo complesso come quello delle palette per turbina, il controllo qualità e l’ottimizzazione di processo per lotti ridotti col fine di abbassare i costi legati alla produzione. Nel processo in analisi, le palette per turbina vengono forgiate a caldo e poi raffreddate in aria calma fino al raggiungimento della temperatura ambiente in modo da poter essere successivamente lavorate tramite macchine a controllo numerico. Le attuali tecnologie di misura rendono possibile il primo controllo dimensionale solo a valle del completo raffreddamento, che può richiedere fino a diverse ore. Date le dimensioni dei lotti tipicamente ridotte, spesso, la forgiatura di un intero lotto viene completata prima che sia stato possibile verificare la geometria del primo pezzo; ciò implica che potenzialmente può essere prodotto un intero lotto fuori tolleranza. Dopo la fase di forgiatura, il controllo dimensionale viene focalizzato alla ricerca dei sovrametalli, che, nel caso siano superiori al valore imposto in fase di progetto comporteranno un aumento dei costi di lavorazione a macchina, diversamente, qualora siano inferiori, porteranno a scartare il pezzo appena prodotto. A seguito di queste considerazioni si comprende l’importanza di anticipare la fase di controllo qualità, ma per fare ciò, non solo è importante essere in grado di misura ad elevate temperature occorre anche sviluppare dei modelli per la comprensione degli effetti distorsivi indotti dal raffreddamento così da prevedere la geometria finale. Ciò diventa un punto cruciale per le geometrie sottili e "freeform" che caratterizzano la foglia di una paletta per turbina. Inoltre, per ottimizzare il processo in base ai risultati delle misurazioni, è necessario comprendere le tolleranze e i costi legati all’ottimizzazione. Infatti, l’ottimizzazione dei parametri di processo durante le fasi iniziali di produzione di un lotto, essenziali per la corretta lavorazione di un componente, comportano rallentamenti e conseguenti costi. Lotti di ridotte dimensioni ne vengono maggiormente penalizzati. Di conseguenza è necessario sviluppare una procedura per determinare quando valga la pena fermare il processo di ottimizzazione. In questo lavoro, un sistema di misura basato sulla triangolazione laser per misura dimensionale di pezzi ad elevata temperatura viene presentato e discusso. Per ragioni di visualizzazione e misurazione, un algoritmo euristico, per la ricostruzione di superfici a partire da nuvole di punti, è stato adattato per superfici libere e concave come quelle che caratterizzano le palette per turbina. Data la rapidità dell’algoritmo è possibile visualizzare la geometria in contemporanea alla misura, permettendo all’operatore di monitorare qualitativamente l’andamento della misura. Le cause di incertezza principali del sistema di misura sono state identificate, quantificate e, se necessario, corrette. In particolare, nel caso di geometrie tipo "freeform", è stata dimostrata l’importanza di una miglior procedura di settaggio dei sensori. Un nuovo metodo per la taratura di sistemi multisensore è stato sviluppato ed è in grado di garantire tempi di settaggio cinque volte inferiori rispetto ai metodi manuali. Grazie alle correzioni proposte, l’ottimizzazione di processo per piccoli lotti di palette per turbina diventa possibile. Un metodo per la valutazione del numero ottimale di iterazioni durante il processo di ottimizzazione è disponibile in letteratura per una specifica combinazione di cosi asimmetrici e variabilità del processo tramite la valutazione del costo atteso ("expected cost"). Una nuova formulazione e un appropriato approccio numerico sono proposti per valutare i costi attesi con variabilità di processo e modello di costo arbitrari. A partire da queste considerazioni, due criteri generalizzati per decidere quando fermare l’ottimizzazione sono proposti, ognuno con particolari vantaggi in specifiche applicazioni. Le prestazioni di queste procedure sono comparate ad un esistente modello allo stato dell’arte, portando una riduzione dei costi pari al 90% quando le misurazioni vengono effettuate solamente durante la fase di ottimizzazione. Infine, una procedura complessiva per l’ottimizzazione di processo, incorporando i metodi proposti, verrà discussa.
Xu, Lei. "Magnetization Dynamics at Elevated Temperatures." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/311342.
Повний текст джерелаIsom, Stephen Clay. "The effects of elevated temperature on preimplantation-stage porcine embryos." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4385.
Повний текст джерелаThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (February 27, 2007) Vita. Includes bibliographical references.
Zhang, Zhan. "Development of magnesium-based alloys for elevated temperature applications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0026/NQ52270.pdf.
Повний текст джерелаCounts, William Arthur. "Mechanical behavior of bolted composite joints at elevated temperature." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/17315.
Повний текст джерелаRatkovich, John. "Processing and elevated temperature ductility of Aluminum alloy 7475." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/27223.
Повний текст джерелаHarlow, K. S. "The elevated temperature mechanical behaviour of aluminium-lithium alloys." Thesis, University of Nottingham, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374661.
Повний текст джерелаSweeney, Deborah May-Katherine. "ELEVATED TEMPERATURE OXIDATION OF BORON MODIFIED Ti-6Al-4V." Wright State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=wright1208285133.
Повний текст джерелаChen, Yong-Ching. "Elevated temperature deformation and forming of aluminum-matrix composites /." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487758178238026.
Повний текст джерелаShah, Vishal Sanjay. "Detection of microcracks in concrete cured at elevated temperature." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0008824.
Повний текст джерелаDike, Shweta Srikant. "Dynamic Deformation of Materials at Elevated Temperatures." Cleveland, Ohio : Case Western Reserve University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1268337193.
Повний текст джерелаDepartment of EMC - Mechanical Engineering Title from PDF (viewed on 2010-05-25) Includes abstract Includes bibliographical references and appendices Available online via the OhioLINK ETD Center
Legrand, Pierre. "Structural assement and design of concrete structures under fire conditions." Thesis, KTH, Betongbyggnad, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187886.
Повний текст джерелаMaster thesis
Huang, Ming Jun. "The application of computational fluid dynamics (CFD) to predict the thermal performance of phase change materials for the control of photovoltaic cell temperatures in buildings." Thesis, Ulster University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248684.
Повний текст джерелаGunda, Rahul. "Performance analysis of high power photoconductive switch at elevated temperature." Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/4310.
Повний текст джерелаThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (July 13, 2006) Includes bibliographical references.
Leggett, Jonathan. "Elevated temperature oxidation and corrosion of a titanium aluminide alloy." Thesis, Cranfield University, 1997. http://dspace.lib.cranfield.ac.uk/handle/1826/3584.
Повний текст джерелаMalm, Chistorpher. "The Flexural Response of Bolted Composite Panels at Elevated Temperature." Fogler Library, University of Maine, 2001. http://www.library.umaine.edu/theses/pdf/MalmCG2001.pdf.
Повний текст джерелаYatomi, Masataka. "Factors affecting the failure of cracked components at elevated temperature." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.405783.
Повний текст джерелаBarrow, A. T. W. "Strong, tough and fatigue-resistant steel for elevated temperature applications." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596428.
Повний текст джерелаCromey, Tyler. "Effect of elevated temperature on ceramic ultrafiltration of colloidal suspensions." Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51778.
Повний текст джерелаAgyakwa, Pearl. "Creep and microstructural development in P91 weldments at elevated temperature." Thesis, University of Nottingham, 2004. http://eprints.nottingham.ac.uk/11759/.
Повний текст джерелаHolmström, Marcus. "Design of a Carbon Fiber Thermocouple for Elevated Temperature Measurements." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279105.
Повний текст джерелаTermoelement är ett av de mest använda instrumenten för temperaturavläsning vid upphöjda temperaturer. Idag finns det bara några få typer av termoelement som är byggda för temperaturer över 1600 ℃, däremot innehar dom vanligtvis en temperaturmätnings osäkerhet på cirka 1% vid dessa höga temperaturer. Över 1600 ℃ temperaturintervallet har de flesta högtemperatur termoelement en tendens att skifta i mätningarna vilket orsakar en felaktig och inexakt mätning av den faktiska temperaturen. Denna avhandling undersöker användningen av kolfiber som ett material för användning i termoelement, genom kombinationen av två olika grafitfibrer. Polyacrylonitrile- (PAN) och Rayon-baserade fibrer användes i en sammansatt kombination upp till en temperatur av 200 ℃, där spänningen mättes mot temperaturen. Studien visar en lovande och stabil linjär effekt av dess elektromotoriska spänning för denna typ av termoelement med kommersiellt tillgängliga kolfibrer vid lägre temperaturer. En jämförelse görs mellan de vanliga termoelementen av typ K och S vid rumstemperaturer, resultaten visar att grafittermoelementen har cirka 21% av den termoelektriska effektiviteten hos den för en typ K eller S termoelement vid 25 ℃. När det gäller dess funktionalitet vid högre temperaturer har liknande grafitmaterial studerats och funnit en potentiell ökning av den termoelektriska stabiliteten vid högre temperaturer över 2000 ℃, vilket visar att grafitbaserade termoelement gör sig väl lämpade för högtemperaturmätningar.
Ahlbäck, Rasmus. "Elevated temperature tests of SiC experiment for MIST : KTH Student Satellite MIST." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-275715.
Повний текст джерелаElektronik idag förlitar sig på kiseltransistorer som är olämpliga för extrema miljöer där temperaturer kan nå upp till 500◦C. Andra material än kisel har föreslagits för att lösa detta problem, där kiselkarbid är en av dem. Transistorer gjorda av kiselkarbid klarar av högre temperaturer än kiseltransistorer och kan potentiellt användas för utforskning av planeter med extrema klimat eller för applikationer vid höga temperaturer så som sensorer inne i motorer. Detta projekt är en del av KTHs student satellit som kommer sändas ut i omloppsbana runt jorden bärandes på ett antal olika experiment, däribland dem finns ”SiC in space” projektet som beskrivs i denna uppsats. Målet med arbetet i denna rapport är att säkerställa att ”SiC in space” experimentet är redo för uppskjutning till rymden. Detta gjordes genom att testa vid olika temperaturer och genom att utveckla mjukvara för analysering av experimentdata samt genom små modifieringar av mjukvara skriven i tidigare arbeten. Baserat på de tester som har genomförts dras slutsatsen att kiselkarbidtransistorn har en acceptabel karaktäristik och att plattformen som kör experimentet klarar av temperaturer upp till 100◦C. Om satelliten överlever uppskjutning ut i rymden kommer med största sannolikhet experimentet att fungera som önskat och generera data som kan påvisa ifall kiselkarbid är lämpligt för applikationer i rymden.
Knox, Joanne Jennefer. "Aspects of modelling plain and reinforced concrete at elevated temperatures." Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/7713.
Повний текст джерелаPrajapati, Kamlesh. "Properties of magnetostrictive alloys at elevated temperatures." Thesis, University of Hull, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322348.
Повний текст джерелаLu, Chi. "Micro-Fabricated Hydrogen Sensors Operating at Elevated Temperatures." UKnowledge, 2009. http://uknowledge.uky.edu/gradschool_diss/767.
Повний текст джерелаFarooq, Muhammad. "Strengthening and degradation mechanisms in austenitic stainless steels at elevated temperature." Doctoral thesis, KTH, Materialteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-122158.
Повний текст джерелаQC 20130517
Antolovich, Bruce F. "Fatigue crack propagation in single crystal CMSX-2 at elevated temperature." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/14880.
Повний текст джерелаMuggelberg, Christiane. "The surface structures of uranium dioxide studied by elevated temperature STM." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389177.
Повний текст джерелаZong, Bernie Yaping. "Strength and fracture of a metal matrix composite at elevated temperature." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260733.
Повний текст джерелаMansour, Morkous Shoukry. "Fundamental study of premixed combustion rates at elevated pressure and temperature." Thesis, University of Leeds, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.535670.
Повний текст джерелаMoon, Hyung-Soo 1969. "Design of Si/SiC hybrid structures for elevated temperature micro-turbomachinery." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/29222.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references.
thermal softening behavior at temperatures above 900 K. This thermal softening behavior limits the turbine inlet temperature, which in turn significantly degrades the overall engine efficiency. Previous studies have shown that hybrid structures of silicon and silicon carbide have good potential for improved engine performance. Detailed design of Si/SiC hybrid structures for high temperature micro-turbomachinery, however, has been hampered by the relatively poor performance of single crystal Si at elevated temperatures and high stresses and by the unavailability of accurate material properties data for both Si and SiC at the temperatures of interest. From previous work, the critical structures and materials issues to be resolved, in order to proceed with the design of high temperature Si/SiC hybrid structures, were identified as follows: 1. the safety margin of the Si/SiC hybrid structures based on the upper yield strength of Si 2. reliable estimation of the service life of the Si/SiC hybrid structures 3. structural instabilities caused by the combination of stress concentrations and strain softening. In the course of this thesis, these issues provided the key motivations of the work, and have been substantially resolved. As a first step, it is critical to obtain a better understanding of the mechanical behavior of this material at elevated temperatures in order to properly exploit its capabilities as a structural material. Creep tests in simple compression with n-type single crystal silicon, with low initial dislocation density, were conducted over a temperature range of 900 K to 1200 K and a stress range of 10 MPa to 120 MPa. The compression specimens were machined such that the multi-slip <100> or <111> orientations were coincident with the compression axis.
(cont.) The creep tests reveal that the response can be delineated into two broad regimes: (a) in the first regime rapid dislocation multiplication is responsible for accelerating creep rates, and (b) in the second regime an increasing resistance to dislocation motion is responsible for the decelerating creep rates, as is typically observed for creep in metals. An isotropic elasto-viscoplastic constitutive model that accounts for these two mechanisms has been developed in support of the design of the high temperature turbine structure of the MIT microengine. From the experimental observations and model validation, basic guidelines for the design of Si/SiC hot structures have been provided. First, the use of the upper yield strength of single crystal Si for design purpose is non-conservative. Also from the perspective of the design of Si hot structures, the lower yield strength is insufficient, particularly for micro-turbomachinery operating at elevated temperatures and high stresses. The recommended approach to the design of Si hot structures is to use the Si model for extracting appropriate operating conditions, and to reinforce the Si structures with SiC in strategic locations. Second, at high temperatures, the effect of stress concentrations is not crucial ...
by Hyung-Soo Moon.
Ph.D.
Darr, Shehla. "Compression recovery of rigid polymer foams following confinement at elevated temperature." Thesis, Kingston University, 2007. http://eprints.kingston.ac.uk/20383/.
Повний текст джерелаRounthwaite, Nicholas James. "Development of bulk nanoquasicrystalline alloys for high strength elevated temperature applications." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:47bdc219-1733-40c1-ac6b-dbd5fc08f175.
Повний текст джерелаAllen, Benjamin William. "Creep and Elevated Temperature Mechanical Properties of 5083 and 6061 Aluminum." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/52630.
Повний текст джерелаMaster of Science
Goodrich, Thomas William. "Thermophysical Properties and Microstructural Changes of Composite Materials at Elevated Temperature." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/35900.
Повний текст джерелаMaster of Science
Shah, Manan Kanti. "Material Characterization and Forming of Light Weight Alloys at Elevated Temperature." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306939665.
Повний текст джерелаSun, Maoye. "On the burst of pipes under internal pressure and elevated temperature /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.
Повний текст джерела