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Dissertations / Theses on the topic 'Fractured election'

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Published: 18 May 2024

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1

Mozika, Nitesh. "Fractured election mandate and formation of ministries under the Indian constitution." Thesis, University of North Bengal, 2014. http://ir.nbu.ac.in/handle/123456789/1489.

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2

CARDOSO, SERGIO G. "Estudo das propriedades mecanicas e dos mecanismos de fratura de fibras sinteticas do tipo nailon e poliester em tecidos de engenharia." reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9504.

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3

Oates, William Sumner. "Fracture of Ferroelectric Materials." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4769.

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Ferroelectric materials continue to find increasing use in actuator, sensor and transducer design. Questions regarding lifetime and reliability remain a concern due to the inherent low fracture toughness and complex material behavior. The poling procedure required for use in actuator and sensing devices introduces anisotropy in elastic and dielectric coefficients as well as piezoelectric coupling between the mechanical and electrical fields. This introduces complex fracture behavior which necessitates advanced analytical techniques and fracture characterization. In this dissertation, fract
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4

Bäckström, Ann. "Investigation of the correlation of fracture frequency and electric resistivity in impact craters in crystalline rocks." Licentiate thesis, KTH, Land and Water Resources Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1725.

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<p>Impact craters are formed when a large meteorite or comethits the Earth. At the impact a shock wave is released causingabundant fracturing in the surrounding bedrock. This type offracturing is intense and occurs throughout a very large volume(>100 km<sup>3</sup>) of the bedrock. Fractures of this type have beenobserved in deep drilling, to 5 km depth, in thePuchezh-Katunki Impact Crater. At theses depths the ambienttemperature is high. Thus impact structures are candidates forpotential heat-exchange sources for extraction of geothermalenergy.</p><p>There is a relation between fracture inten
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5

Allen, Robert Michael. "A study of the processes involved in the formation of nano-structures inorganic materials, using high brightness electron beams." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240887.

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6

Furlan, Renan Diego. "Comparison of mechanical behavior between conventional NiTi, CM, M-Wire and CM-EDM alloy instruments for cyclic fatigue and torsion fracture - evaluation of fracture surface in scanning electron microscope." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/25/25147/tde-23012019-161605/.

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The aim of this study was to evaluate the cyclic and torsional fatigue resistance of Nickel-Titanium rotary instruments manufactured by different thermal treatments. Were tested a total of 140 rotary instruments (n=20): Genius (GN size 25, .04 taper), Trushape (TS size 25, .06 taper), Logic (LOG size 25, .06 taper), Vortex Blue (VB size 25, .06 taper), ProTaper Gold (PTG size 25, .08 taper), Hyflex CM (HCM size 25, .06 taper) and Hyflex EDM (EDM size 25, .08 taper). Cyclic fatigue resistance testing was performed using an artificial stainless steel canal with a curvature (60° angle and 5- mm r
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7

MORCELLI, APARECIDO E. "Estudo dos micromecanicos de deformacao e fratura da liga de titanio Ti-6Al-4V utilizando-se tecnicas de microscopia eletronica e difracao de raios X." reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9505.

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8

Tu, Haoyun Verfasser], and Siegfried [Akademischer Betreuer] [Schmauder. "Numerical simulation and experimental investigation of the fracture behaviour of an electron beam welded steel joint / Haoyun Tu ; Betreuer: Siegfried Schmauder." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2016. http://d-nb.info/1118368576/34.

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9

Tu, Haoyun [Verfasser], and Siegfried [Akademischer Betreuer] Schmauder. "Numerical simulation and experimental investigation of the fracture behaviour of an electron beam welded steel joint / Haoyun Tu ; Betreuer: Siegfried Schmauder." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2016. http://d-nb.info/1118368576/34.

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10

Islam, Md Shafiqul. "Shear Fracture and Delamination in Packaging Materials : A study of Experimental Methods and Simulation Techniques." Licentiate thesis, Blekinge Institute of Technology, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-13340.

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Packages are the means of preservation, distribution and convenience of use for food, medicine and other consumer products. Package opening is becoming complicated in many cases because of cutting cost in design and production of opening techniques. Introduction of new package opening technique, material or geometry for better opening experience, forces new design measurements which require a large number of prototype developments and physical testing. In order to achieve more rapid and accurate design, Finite Element Method (FEM) Simulations are widely used in packaging industries to complime
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11

Sridhar, Ashish [Verfasser], and Marc-André [Akademischer Betreuer] Keip. "Phase-field modeling of microstructure and fracture evolution in magneto-electro-mechanics / Ashish Sridhar ; Betreuer: Marc-André Keip." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2020. http://d-nb.info/1232727903/34.

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12

Leek, Darrell Stewart. "A study of the effects of chloride and sulphate on the hydration of portland cement and the corrosion of carbon steel reinforcement using electron-optical techniques and energy dispersive X-ray analysis." Thesis, Queen Mary, University of London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265400.

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13

Iqbal, Farasat [Verfasser], та Mathias [Akademischer Betreuer] Göken. "Fracture Mechanisms of γ–TiAl Alloys Investigated by In-situ Experiments in a Scanning Electron and Atomic Force Microscope / Farasat Iqbal. Betreuer: Mathias Göken". Erlangen : Universitätsbibliothek der Universität Erlangen-Nürnberg, 2012. http://d-nb.info/1029374473/34.

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14

Porfyrakis, Kyriakos. "Mesoscale modelling of processing toughened polymers." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342634.

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15

Marín, Hernández Lorena. "Hygrothermal effects on CFRP: testing, analysis and structural optimization." Doctoral thesis, Universitat de Girona, 2015. http://hdl.handle.net/10803/398412.

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In the common design and certification process, a large number of experimental tests, going from small specimens to the full structure, are performed. In these tests, the environmental conditions, especially temperature and humidity, which the structural component will be submitted are considered. This multiplies the number of tests to be performed. With the aim of reducing the economic cost and the time needed for the design and the certification of components, numerical tools that allow a reduction of experimental tests and help in the analysis of results, are developed. In this framework, t
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16

Faot, Fernanda. "Propriedades mecanicas de resinas acrilicas para base de protese antes e apos metodos de reparos." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288669.

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Orientadores: Renata Cunha Matheus Rodrigues Garcia, Altair Antoninha Del Bel Cury<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba<br>Made available in DSpace on 2018-08-07T23:27:29Z (GMT). No. of bitstreams: 1 Faot_Fernanda_D.pdf: 1972781 bytes, checksum: b3ce58297c07d4abe90d5b2bf79729e7 (MD5) Previous issue date: 2006<br>Resumo: Fraturas por impacto e flexão ainda são os principais problemas relatados tanto pelos portadores de próteses removíveis como pelos cirurgiões dentistas. Na tentativa de solucionar esse problema, alterações na composiç
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17

SANTOS, CARLOS A. X. "Estudo do compósito 3Y-TZP/Sisub(2)Nsub(2)O obtido por sinterização sem pressão." reponame:Repositório Institucional do IPEN, 2006. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11430.

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18

Eriksson, Mathias. "Undersökning av brottytor på utmattningsprovstavar av stål till borrkronor." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-51835.

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Utmattningsbrott är ett återkommande problem som uppstår i borrkronor. Atlas Copco Secoroc har tidigare gjort utmattningsprovningar på fyra serier provstavar. Serierna skiljer sig från varandra på så sätt att stålet är hårt respektive mjukt härdat. Det hårdhärdade stålet är indelat i två serier. På den ena har dragprovsutmattning utförts och på den andra roterande-böj utmattning. Det samma gäller för det mjukhärdade stålet. De brottytor som uppstått vid brott av dessa provningar har undersökts, brottsförskjutningen har mätts och brottytan har analyserats med SEM. Om en icke-metallisk inneslutn
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19

Shilling, Michael. "OPTIMIZING DETECTION AND CONTROL OF CLOSTRIDIUM DIFFICILE AND ITS TOXINS." Kent State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=kent1374852321.

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20

SOARES, MARIA da C. B. V. "Influencia das tensoes residuais no comportamento em fadiga e fratura de ligas metalicas." reponame:Repositório Institucional do IPEN, 1998. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10668.

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21

LOBO, RAQUEL de M. "Reconstrucao tridimensional de superficies de fratura de materiais compositos do tipo CFRP." reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9414.

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Made available in DSpace on 2014-10-09T12:26:37Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:06:22Z (GMT). No. of bitstreams: 0<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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22

FERRARI, MARCELLO. "Soldagem de chapas grossas em aço baixa liga temperado e revenido ASTM A514 com aço carbono ASTM A36 pelo processo arame tubular." reponame:Repositório Institucional do IPEN, 2016. http://repositorio.ipen.br:8080/xmlui/handle/123456789/27505.

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Submitted by Marco Antonio Oliveira da Silva (maosilva@ipen.br) on 2017-05-25T13:57:54Z No. of bitstreams: 0<br>Made available in DSpace on 2017-05-25T13:57:54Z (GMT). No. of bitstreams: 0<br>Neste trabalho foram determinadas as condições para a soldagem de chapas grossas de aço carbono ASTM A36 com aço baixo-liga temperado e revenido ASTM A514 Grau Q empregando-se o processo arame tubular. Para tanto foram soldadas diversas peças de testes com o intuito de se avaliar as condições mais adequadas de preparação e soldagem de juntas dissimilares destes materiais. A preparação foi realizada por me
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23

Vyhlídal, Michal. "Porušování vybraných stavebních kompozitů v blízkosti rozhraní plniva a matrice." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-372021.

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The interface between aggregate grains and matrix in cementitious composites is their weakest element. The topic is particularly significant in the case of high performance and high strength concrete technology for which the eliminination or reduction of these weak links are necessary. The aim of this thesis is to determine the influence of the interface on the fracture behaviour of the cementitious composites. The fracture experiments were performed for this purpose and were complemented by the nanoindentation’s results and scanning electron microscopy results. Numerical model was created in
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24

Chervy, Pierre. "Caractérisation biophysique des interactions entre le Lanréotide et des membranes lipidiques." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS306.

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L’objectif de ce travail est de caractériser l’interaction entre le Lanréotide – un octapeptide dicationique – et des membranes composées de lipides. Bien que ce peptide soit très soluble, il possède des propriétés d’autoassemblage. Au-delà d’une concentration critique – qui est sensible à la température et à la force ionique – ce peptide s’auto-assemble en nanotubes dont la structure a été résolue par l’équipe. Ce travail de thèse comporte deux volets : d’une part l’étude de l’interaction entre le Lanréotide et des membranes anioniques, d’autre part l’étude de l’interaction entre le Lanréotid
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25

Okulov, Ilya. "Microstructure and mechanical properties of new composite structured Ti-based alloys." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-160897.

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The demanding structural applications (e.g. aerospace, biomedical, etc.) require new materials with improved mechanical performance. The novel Ti-based dendrite + nano-/ultrafine-structured (Ti-based DNUS) composites exhibit an advantageous combination of high compressive strength (2000 – 2500 MPa) and large compressive ductility (10 – 30 %) already in the as-cast state [1,2] and, therefore, can be referred as high-performance materials. However, these Ti-based composites frequently exhibit very low or even lack of tensile ductility [3]. Therefore, the aim of this research work is to develop h
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26

Ribes, Hervé. "Microstructure de composites aluminium-carbure de silicium après traitements thermomécaniques." Grenoble INPG, 1989. http://www.theses.fr/1989INPG0084.

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Ce travail porte sur l'etude de composites a matrices aluminium (al-mg-si) renforcees par des particules de carbure de silicium qui ont ete utilisees soit brut de reception soit prealablement oxydees. Une investigation microstructurale detaillee (realisee en partie par microscopie electronique en transmission) a permis de preciser la nature de l'interface al/sic dans ces composites ainsi que l'evolution de la precipitation apres traitements thermiques. Nous avons montre que l'interface est souvent composee par differentes interphases dont la composition et le mode de formation sont presentes.
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27

Schmitt, Jean-Michel. "Albitisation triasique, hydrothermalisme jurassique et alteration supergene recente. Metallogenie des gisements uraniferes du rouergue." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13173.

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Les concentrations uraniferes qui font l'objet de ce travail sont des gites multifissures, de paragenese simple, quasi monometallique, ou l'uranium s'exprime sous forme d'oxydes. Elles se localisent aussi bien dans le socle que dans les sediments permo-carboniferes et recoupent meme localement le contact socle-couverture. Dans les deux principaux secteurs mineralises, bertholene et brousse-broquies sont decrites respectivement l'albitisation d'un socle orthogneissique et celle d'une serie permo-houillere. La repartition precise des zones albitisees montre qu'elles constituent en fait les racin
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28

Beuton, Romain. "Modélisation de la structuration d'un matériau diélectrique irradié par une impulsion laser femtoseconde." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0231/document.

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Les lasers femtosecondes sont un outil efficace pour induire des modifications structurelles localisées en volume dans les matériaux diélectriques. Initialement transparents, les diélectriques ne commencent à absorber efficacement l’énergie laser que lorsque l’intensité excède le seuil de claquage optique du matériau. Cette propriété, couplée à une durée d’impulsion femtoseconde plus courte que les temps caractéristiques de relaxation de la matière, permet d’obtenir un dépôt d’énergie précis et localisé dans le volume irradié. Pour modéliser la formation de telles structures, un modèle thermo-
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29

Manarão, Diego Santos. "Síntese e processamento de compósito cerâmico zircônia-grafeno." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/23/23140/tde-12062018-093929/.

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O objetivo desse trabalho foi desenvolver um compósito cerâmico de zircônia-grafeno para aplicação odontológica. Este estudo avaliou o efeito do pó de partida, concentração de grafeno e da temperatura de sinterização sobre as propriedades mecânicas (dureza e tenacidade à fratura) do compósito desenvolvido. Para isto foram sintetizados os pós de Y-TZP a partir de soluções de óxido-cloreto de zircônio e cloreto de ítrio na proporção desejada de 3mol% através da rota de co-precipitação em solução de hidróxido de amônio seguido por uma série de lavagens em água, etanol e butanol com posterior dest
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30

Tsivoulas, Dimitrios. "Effects of combined Zr and Mn additions on the microstructure and properties of AA2198 sheet." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/effects-of-combined-zr-and-mn-additions-on-the-microstructure-and-properties-of-aa2198-sheet(6bb2c9db-7584-464b-8064-bab0cc2d397c).html.

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The effect of individual and combined zirconium and manganese additions have been compared for an AA2198 6 mm thick sheet in T351 temper regarding their influence primarily on recrystallisation resistance and secondly on fracture toughness and overageing resistance. A complete characterisation of the dispersoid distributions was carried out for a deeper understanding of the effects of the Al3Zr and Al20Cu2Mn3 particles, involving studying their formation from the as-cast and homogenised stage.The most important finding in this work was the lower recrystallisation resistance in the alloy contai
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31

Gomes, Giovana Mongruel. "INFLUÊNCIA DA ADAPTAÇÃO DE PINOS DE FIBRA E DE TÉCNICAS RESTAURADORAS ALTERNATIVAS PARA PREENCHIMENTO DE CANAIS RADICULARES EXCESSIVAMENTE ALARGADOS." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2013. http://tede2.uepg.br/jspui/handle/prefix/1824.

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Made available in DSpace on 2017-07-24T19:22:29Z (GMT). No. of bitstreams: 1 Giovana Mongruel Gomes.pdf: 3752517 bytes, checksum: 6acad02e468853d81d1d9172fd003844 (MD5) Previous issue date: 2013-09-20<br>The objectives of this study were 1) to evaluate the effect of the influence of the resin cement thickness (RCT) on bond strength (BS) and gap formation (GF) between glass fiber post (FP) and root dentin and 2) to evaluate the BS and fracture resistance (FR) of restorative techniques for filling oversized root canals. In experiment 1, the roots of 24 mandibular premolars (n=8 per group) were
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32

Bennani, Lokman. "Modélisation bidimensionnelle de systèmes électrothermiques de protection contre le givre." Thesis, Toulouse, ISAE, 2014. http://www.theses.fr/2014ESAE0037/document.

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Icing has since long been identified as a serious issue in the aeronautical world. Ice build up, due to the presence of supercooled water droplets in clouds, leads to degradation of aerodynamic and/or air intake performances, among other undesirable consequences. Hence aircraft manufacturers must comply with certifications and regulations regarding flight safety in icing conditions. In order to do so, ice protection systems are used. Due to the multi-physical context within which these systems operate, numerical simulation can be a valuable asset. The present work deals with the numerical mode
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33

Dylewski, Benoît. "Caractérisation expérimentale multi-échelles et multi-techniques du rail prélevé en service : de la déformation plastique sévère et des évolutions de microstructure à l'amorçage de fissures par Fatigue de Contact de Roulement." Electronic Thesis or Diss., Compiègne, 2016. http://www.theses.fr/2016COMP2324.

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Cette thèse est dédiée à la caractérisation de la déformation plastique sévère et des évolutions de la microstructure engendrées dans les rails en service, conduisant à leur fissuration par Fatigue de Contact de Roulement. L’amorçage de ces fissures en surface et leur propagation en profondeur mettent en jeu des phénomènes à l’échelle de la microstructure qui peuvent entrainer à l’échelle macroscopique des écaillages de surface ou même conduire à des ruptures brutales de rails en cours de fonctionnement. Pour améliorer la compréhension de ces différents phénomènes en sous surface, une méthodol
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34

Jendoubi, Khemaïs. "Mesures locales et globales des paramètres mécaniques gouvernant la fissuration par fatigue." Poitiers, 1987. http://www.theses.fr/1987POIT2312.

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Etude sur l'alliage d'aluminium a haute resistance 2024t351 et sur l'acier inoxydable aisi316. Determination, par mesures locales a l'aide de microjauge, du champ de deformation existant au voisinage de la pointe de fissure pour differentes conditions de chargement. Mesures globales a l'aide d'un capteur de deplacement a lames monte sur l'axe de chargement, de l'energie q dissippee par cycle et le facteur d'intensite de contraintes effectif. Mesure de l'ouverture de fissure par microscopie electronique a balayage. Proposition de la modelisation experimentale du champ de deformation pour des fa
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35

Campagnac, Marie-Hélène. "Structures et proprietes mecaniques d'alliages de titane a bas transus ti-10v-2fe-3al et ti-10v-3cu-al." Paris 6, 1988. http://www.theses.fr/1988PA066115.

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Etude par microscopie electronique en transmission et par diffraction de rayons x de l'evolution structurale au cours de revenu allant de 300 a 525c. Ces etudes montrent que la morphologie et la distribution de la phase alpha peuvent etre controlees par traitement thermique. Etude de l'influence des parametres: double mise en solution, double revenu, vitesse de montee en temperature sur les proprietes de traction et de tenacite. Comparaison entre les deux alliages
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36

Hooker, John Noel. "Fracture scaling and diagenesis." 2012. http://hdl.handle.net/2152/19573.

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Sets of natural opening-mode fractures in sedimentary rocks may show a variety of types of aperture-size distributions. A frequently documented size distribution type, in the literature and in data presented here, is the power law. The emergence of power-law distributions of fracture aperture and length sizes has been simulated using various quasi-mechanical fracture-growth routines but models based on linear-elastic fracture mechanics rarely produce such patterns. I collected a fracture-size dataset of unprecedented size and resolution using core and field methods and scanning electron micros
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37

Wang, Jianxin. "Fracture toughening of ferroelectric ceramics under electro-mechanical loading." Thesis, 2007. http://hdl.handle.net/1911/20665.

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In this dissertation, the fracture toughening behavior of ferroelectric materials under different electromechanical loading conditions is predicted and compared to available experimental observations. A multi-axial, electromechanically coupled, incremental phenomenological constitutive model for ferroelectric ceramics is developed first. The constitutive model is then implemented within the finite element method to study the effects of electric field on the Mode I steady crack growth under plane stress and plane strain conditions. Toughening behaviors of electrically permeable cracks are simul
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38

Jan, Yu-Ru, and 詹育儒. "Fracture Analysis of Magneto-Electro-Elastic Materials with an Arbitrarily Oriented Crack." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/35260357322783244808.

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碩士<br>國立成功大學<br>機械工程學系碩博士班<br>94<br>In this studying, the fracture problem of an arbitrarily oriented crack in a magnetoelectroelastic solid has been analyzed by using the energy density theory. The solution for the energy density factor S is modified to include the stress intensity factors, the electric displacement intensity factor(or the electrical field intensity factor) and the magnetic induction intensity factor(or the magnetic field intensity factor). The driving force and crack growth are also found to be significantly influenced by the polarization direction. Change in the directio
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Liu, Jin-Chee, and 劉晉奇. "Antiplane Fracture Analysis of Bimaterial Magneto-Electro-Elastic Wedge with an Interface Crack." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/23242432013858637710.

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博士<br>國立成功大學<br>機械工程學系碩博士班<br>93<br>This paper contains two parts. The first part is to study the fracture problem of a bimaterial magneto-electro-elastic (MEE) composite wedge containing an interface impermeable crack under antiplane shear and inplane electric and magnetic loads. After employing the Mellin transform and residue theorem, the governing equations are reduced to a system of singular integral equations. The antiplane magneto-electro-elastic field inside a circular region between the crack tips is obtained. It is found that the fields of stress, electric displacement and magnetic i
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EL-KHAZEN, JOHN. "LOW TEMPERATURE CLEAVAGE FRACTURE OF MICROALLOYED BAINITIC PLATE STEELS." Thesis, 2009. http://hdl.handle.net/1974/2572.

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Low temperature cleavage fracture behaviour was investigated using four experimental microalloyed bainitic plate steels. The four plate samples were produced by different thermomechanical processing (TMP) schedules and had yield strengths in the range 540 - 670 MPa. Microstructures were characterized by optical microscopy (OM), scanning electron microscopy (SEM) and electron back scattered diffraction (EBSD). Quantitative data was obtained for prior austenite grain (PAG) size, volume fractions of two bainite types (conventional bainite and acicular ferrite) and EBSD 15° domain size. Charpy imp
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Gallo, Federico Guido. "Effect of electro-mechanical loading in metallic conductors." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-12-2552.

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The development of high powered electro-magnetic devices has generated interest in the effect of combined electromagnetic and mechanical loading of such structures. Materials used in high-current applications – aluminum alloys and copper – are subjected to heat pulses of short duration (in the range of a few hundred microseconds to a few milliseconds); immediately following or along with such heat pulses, these materials are also subjected to large mechanical forces. In previous work reported in the literature, ejection of material from the vicinity of preexisting defects such as cracks, notch
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MotsI, Glenda Tsholofelo. "In-situ scanning electron microscopy studies on the uniaxial tensile deformation mechanisms in Aluminium alloy 5083." 2014. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001710.

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M. Tech. Metallurgical Engineering.<br>Aims to study tensile deformation mechanisms of aluminium alloy 5083 using in situ SEM techniques. The objectives to achieve this aim are: to investigate the effect of strain rate on mechanical properties ; investigating anisotropy mechanical properties at varying strain rates ; investigating microstructure anisotropy behaviour at varying strain rates and to investigate the influence of intermetallic particles during tensile deformation.
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Polanskey, Carol Ann. "I. Impact spallation experiments: fracture patterns and spall velocities. II. Craters in carbonate rocks: an electron paramagnetic resonance analysis of shock damage." Thesis, 1989. https://thesis.library.caltech.edu/7994/1/Polanskey_ca_1989.pdf.

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<p>This work is divided into two independent papers.</p> <p>PAPER 1.</p> <p>Spall velocities were measured for nine experimental impacts into San Marcos gabbro targets. Impact velocities ranged from 1 to 6.5 km/sec. Projectiles were iron, aluminum, lead, and basalt of varying sizes. The projectile masses ranged from a 4 g lead bullet to a 0.04 g aluminum sphere. The velocities of fragments were measured from high-speed films taken of the events. The maximum spall velocity observed was 30 m/sec, or 0.56 percent of the 5.4 km/sec impact velocity. The measured velocities were compared
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Hossain, Md Nur. "INFLUENCE OF TEMPERATURE AND STRESS RATIO ON FATIGUE AND FRACTURE RESPONSE OF HPDC AM60B MAGNESIUM ALLOY." Thesis, 2010. http://hdl.handle.net/10222/13080.

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The mechanical behavior of a high pressure die cast AM60B Mg alloy is studied. Constant load amplitude fatigue tests were conducted at room, elevated and cold temperatures, with a stress ratio of R=0.1, and frequency of 30 Hz. The objective was to identify the possible effects of temperature on fatigue life cycle. In addition, fatigue crack propagation tests were conducted to ascertain the fatigue response of the alloy and determine its fatigue crack growth rate as a function of the applied stress ratio, experimentally, analytically and computationally, using Walker’s model. The results demons
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Pollard, Brittney Maryah. "Reactivation of fractures as discrete shear zones from fluid enhanced reaction softening, Harquahala metamorphic core complex, west-central Arizona." Thesis, 2014. http://hdl.handle.net/2152/25744.

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Discrete (mm- to m-scale) mylonitic shear zones in the northeastern Harquahala metamorphic core complex, Arizona, show evidence of fluid-mineral interactions catalyzing deformation and metamorphism. Many contain a deformed central epidote vein with adjacent bleached haloes and flanking paired shear zones that indicate significant fluid-rock interaction during deformation. An integration of structural and geochemical methods was employed to understand timing, metamorphic conditions, and physiochemical processes responsible for producing the discrete shear zones. Field and microstructural eviden
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Freels, Matthew Webster. "Monotonic and Cyclic Compression Behavior of Bulk Metallic Glasses." 2010. http://trace.tennessee.edu/utk_graddiss/689.

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The cyclic-compression behavior of a Cu45Zr45Al5Ag5 bulk metallic glass (BMG) was investigated in order to elucidate the damage initiation and growth mechanisms. The present Cu45Zr45Al5Ag5 BMG was found to have the highest fatigue-endurance limit for BMGs reported to date. Fracture under cyclic compression occurred in a pure shear mode. In addition to many shear bands and cracks, areas of “chipping” were commonly found on the outside surfaces of the fatigue specimens. Crack growth rates were found decrease with cycles. The effects of the as-cast specimen size, cooling rate, and the free volume
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Okulov, Ilya. "Microstructure and mechanical properties of new composite structured Ti-based alloys." Doctoral thesis, 2014. https://tud.qucosa.de/id/qucosa%3A28549.

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The demanding structural applications (e.g. aerospace, biomedical, etc.) require new materials with improved mechanical performance. The novel Ti-based dendrite + nano-/ultrafine-structured (Ti-based DNUS) composites exhibit an advantageous combination of high compressive strength (2000 – 2500 MPa) and large compressive ductility (10 – 30 %) already in the as-cast state [1,2] and, therefore, can be referred as high-performance materials. However, these Ti-based composites frequently exhibit very low or even lack of tensile ductility [3]. Therefore, the aim of this research work is to develop
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