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Tesis sobre el tema "Brittle structures"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 14 de febrero de 2022

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1

Kabeel, Abdallah Mahmoud Bayoumi. "Nominal strength and size effect of quasi-brittle structures with holes." Doctoral thesis, Universitat de Girona, 2015. http://hdl.handle.net/10803/289985.

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The main contribution of this work is to introduce analytical models able to create simple design charts that would allow designers to quickly determine the strength of quasi-brittle structures containing circular holes. Cohesive Zone Models are an excellent tool to model quasi-brittle structures with holes in which a large failure process zone is confined in a plane. Also, the CZM is able to predict the effect of the structure size on its strength. Moreover, it is one of the few models (or the only model) that takes into account the material cohesive law explicitly. Therefore, most of the pre

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2

Ueda, Tadamasa. "Seismogenic deformation structures in the brittle-ductile transition regime: a case study of ultramafic pseudotachylytes and related deformed rocks in the Balmuccia peridotite body, Italy." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/204571.

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3

Hossain, Md Sakawat [Verfasser], Jörn H. [Akademischer Betreuer] Kruhl, Claudia [Akademischer Betreuer] Trepmann, and Jürgen [Akademischer Betreuer] Scheurle. "Quantification of Impact-Induced Brittle Structures: An Analysis of Stress- and Scale-Dependence of Brittle Deformation Processes / Md. Sakawat Hossain. Gutachter: Claudia Trepmann ; Jürgen Scheurle ; Jörn H. Kruhl. Betreuer: Jörn H. Kruhl." München : Universitätsbibliothek der TU München, 2015. http://d-nb.info/1076866417/34.

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4

Aboubakr, Attitou Amen Mohamed [Verfasser]. "Behaviour study of grouted connection for offshore wind turbine structures with brittle cement based grouts / Attitou Amen Mohamed Aboubakr." Kassel : Universitätsbibliothek Kassel, 2020. http://d-nb.info/1208531697/34.

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5

Day, Erik. "Characterization of Structures and Deformation in the Brittle-Ductile Transition, Western Termination of the Chugach Metamorphic Complex, Southern Alaska." ScholarWorks@UNO, 2007. http://scholarworks.uno.edu/td/529.

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Field mapping along the western termination of the Chugach Metamorphic Complex (CMC) revealed a new D2 structure, the Bremner foliation fan. This structure has a high strain, vertically foliated core, with moderate-shallow dipping cleavages to the north and south which rollover into the core. The fan appears to have propagated from below by a shear-zone at depth (O'Driscoll, 2006). Description of the Bremner foliation fan revealed that the Bremner shear zone of Pavlis and Sisson (2003) is a D3 structure, and that the Stuart Creek fault is a younger brittle fault with 90km of dextral offset. El

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6

Vadluga, Vaidas. "Simulation of dynamic deformation and fracture behaviour of heterogeneous structures by discrete element method." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20080213_082157-83281.

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Research area and topicality of the work. Mechanical properties and their evolution under loading are the most significant factors for the development of various mechanical structures, technologies and equipment. It seems to be natu-ral that deeper understanding of the behaviour of existing and design of new materials presents a challenge in different research areas. It should be noted, that all the materials are heterogeneous in meso- and micro- scales. They exhibit essential differences, compared to the macroscopic continuum behaviour. Basically, both experimental and numerical simulation m

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7

Albuerne, Alejandra. "Seismic collapse of vaulted structures : unreinforced quasi-brittle materials and the case study of the Basilica of Maxentius in Rome." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:380ad3b8-c973-4184-8f67-9d6c785760c9.

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Seismic loading is one of the biggest threats to the stability of masonry architecture is many parts of the world. Buildings that have stood for centuries under their self-weight, could suffer collapse in an unprecedented seismic event. The current research aims at furthering our understanding of how masonry vaulted buildings behave in earthquakes. Our ability to anticipate damages or collapse of existing structures will depend on this understanding. Based on the study of ancient Roman buildings, this work focuses on types of masonry that exhibit cohesive behaviour due to the presence of stron

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8

Saloustros, Savvas. "Tracking localized cracks in the computational analysis of masonry structures." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/461714.

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Numerical methods aid significantly the engineering efforts towards the conservation of existing masonry structures and the design of new ones. Among them, macro-mechanical finite element methods based on the smeared crack approach are commonly preferred as an affordable choice for the analysis of large masonry structures. Nevertheless, they usu-ally result in a non-realistic representation of damage as smeared over large areas of the structure, which hampers the correct interpretation of the damage pattern. Additionally, a more critical pathology of this approach is the mesh-dependency, which

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9

Brahmachari, Koushik, of Western Sydney Hawkesbury University, of Science Technology and Agriculture Faculty, and School of Construction and Building Sciences. "Connection and flexural behaviour of steel RHS filled with high strength concrete." THESIS_FTA_CBS_BRAHMACHARI_K.xml, 1997. http://handle.uws.edu.au:8081/1959.7/526.

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Steel hollow section members filled with concrete have been frequently used in recent construction industry as columns and beams and beam-columns because of their superior performance and constructability. Previous research demonstrated that such system has large energy absorption capacity which is critical in the event of an earthquake. By filling steel RHS with concrete, the failure of the steel shell due to local buckling can be delayed and the ductility of the concrete core can be improved as a result of the confinement of the steel shell. This type of composite section may be used in vari

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10

Bates, Stephen John. "A regional evaluation of the shear detachements and brittle-ductile structures of the western foreland margin of the Adelaide Fold-Thrust Belt, northern Mount Lofty Ranges, South Australia /." Title page, contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09SB/09sbb329.pdf.

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Thesis (B. Sc.(Hons.))--University of Adelaide, Dept. of Geology and Geophysics, 1998.<br>Two folded, coloured maps in packet pasted onto back cover. National Grid Reference (SI 54-9) 6629-11; 12, 19, 20 (SI 54-5) 6530-06; 07, 6630-01 1:10 000 sheets. Includes bibliographical references (6 leaves ).

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11

Muedi, Thomas Tshifhiwa. "Cretaceous dyke swarms and brittle deformation structures in the upper continental crust flanking the Atlantic and Indian margins of Southern Africa, and their relationship to Gondwana break-up." Thesis, Nelson Mandela Metropolitan University, 2013. http://hdl.handle.net/10948/d1020896.

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Permanent brittle deformation of rocks of the upper crust is often manifested in the growth of fractures, or sliding along fractures, which may subsequently be intruded by magma and other fluids. The brittle deformation structures described here include faults, joints and dykes. Brittle deformation structures along passive continental margins result from continental fragmentation and related uplift, as is seen around the southern African margins in response to Gondwana break-up. In many cases the fragmentation is accompanied by significant magmatic events, for example the Cretaceous mafic dyke

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12

Roshan, Arman. "Different Approaches to Model Cover-Cracking of RC Structures due to Corrosion." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37104.

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This thesis presents three different approaches to model corrosion-induced crack propagation in reinforced concrete structures. The first approach is solved numerically using finite differences to model the softening behaviour of concrete in tension. The second approach idealizes the concrete cover as either a brittle elastic or an elastoplastic material so that it may be solved using a closed-form solution. Both approaches are based on a thick-walled cylinder (TWC) analogy and consider rust compressibility and rust diffusion into cracks. The third approach uses finite element modelling to val

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13

Bui, Huu Phuoc. "Approche multi-échelle de la rupture des structures en béton : Influence des agrégats sur la longueur interne du matériau." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENI070/document.

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Pour l'analyse de durabilité et la conception économique (moins de matériel) de structures en matériaux ressemblant à du béton, la modélisation de la rupture est essentielle. Dans le cadre de la mécanique des milieux continus, une longueur interne est introduite dans les modèles non locaux pour remédier au problème lié à la sensibilité du maillage qui est une pathologie des modèles d'endommagement classiques , lorsqu'il s'agit de matériaux adoucissantes. Toutefois, l'évaluation de la longueur interne de hétérogénéités du matériau est toujours une question difficile, ce qui rend un problème obs

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14

Vassaux, Maxime. "Comportement mécanique des matériaux quasi-fragiles sous sollicitations cycliques : de l’expérimentation numérique au calcul de structures." Thesis, Cachan, Ecole normale supérieure, 2015. http://www.theses.fr/2015DENS0010/document.

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Les modèles de comportement mécanique, dits macroscopiques, sont développés à la fois pour leur légèreté, permettant le calcul d’éléments structuraux pouvant atteindre d’importantes dimensions, et pour leur finesse de représentation des phénomènes mécaniques observés par le matériau à des échelles plus fines. Le développement de tels modèles est ici effectué dans le cadre de la sollicitation sismique, donc des chargements cycliques alternés, appliquée à des ouvrages en matériaux quasi-fragiles, et plus précisément en béton. À ce jour, les modèles macroscopiques, effectivement applicables au ca

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15

Tossell, D. A. "Mode III fracture mechanics of brittle and semi-brittle materials." Thesis, University of Bristol, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370777.

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16

Recho, Naman. "Amorçage et propagation d'une fissure de fatigue des éléments de structures métalliques soudés." Paris 6, 1987. http://www.theses.fr/1987PA066198.

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17

Townsend, D. "Liquid impact properties of brittle materials." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372907.

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18

Samuels, J. "The brittle to ductile transition in silicon." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382682.

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19

Mbeledogu, I. U. "Stress and failure analyses of brittle bodies under compressive loads." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374558.

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20

Bernaudin, Maxime. "Rhéologie des failles lithosphériques : vers une compréhension géologique et mécanique de la zone de transition sismique-asismique." Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTT145/document.

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Ces vingt dernières années, le développement de réseaux haute résolution sismologiques et géodésiques denses a permis la découverte de nouveaux signaux géophysiques parmi lesquels on trouve les trémors non-volcaniques (Non-volcanic tremor, NVT, Obara 2002) et les glissements lents épisodiques (Slow Slip Event, SSE, Dragert et al., 2001). La combinaison de NVT et de SSE est communément observée le long des frontières de plaques, entre la zone sismogénique bloquée à faible profondeur et la zone en fluage ductile à plus grande profondeur (Dragert et al., 2004). Cette association définie des gliss

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21

Wang, Rentong. "Failure mechanism of a brittle layered material." Columbus, Ohio : Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1086210643.

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Thesis (Ph. D.)--Ohio State University, 2004.<br>Title from first page of PDF file. Document formatted into pages; contains xii, 134 p.; also includes graphics. Includes abstract and vita. Advisor: Noriko Katsube, Dept. of Mechanical Engineering. Includes bibliographical references (p. 121-125).

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22

Venkateswaran, Anuradha. "Role of cracks in creep of brittle, polycrystalline, structural ceramics." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/49951.

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An analytical study was conducted of the effect of cracks on creep of polycrystalline, brittle structural ceramics. Two independent mechanisms of contribution of cracks were defined. The mechanism of elastic creep by crack growth represents the rate of increase in strain, with time, resulting from the time-dependent decrease in elastic moduli of the material, due ·to crack growth. The mechanism of crack-enhanced creep provides a measure of the increase in creep rate over that in an identical but crack-free material, due to the local stress field associated with the cracks and the resultant tra

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23

Mitchell, Frances. "Structural analysis of brittle deformation features along Grenvillian shear zones in southeastern Ontario." Thesis, Kingston, Ont. : [s.n.], 2007. http://hdl.handle.net/1974/496.

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24

Justo, Ana Paula. "Sistemas orbitais e a?reos aplicados ? an?lise multi-escala da tect?nica r?ptil atuante na borda sudeste da Bacia do Parna?ba." Universidade Federal do Rio Grande do Norte, 2006. http://repositorio.ufrn.br:8080/jspui/handle/123456789/18838.

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Made available in DSpace on 2015-03-13T17:08:39Z (GMT). No. of bitstreams: 1 AnaPJ_ate_cap4.pdf: 5254385 bytes, checksum: 3ac040e5f9ad13d1d9fc82f32f2f0abf (MD5) Previous issue date: 2006-08-25<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>The tectonics activity on the southern border of Parna?ba Basin resulted in a wide range of brittle structures that affect siliciclastic sedimentary rocks. This tectonic activity and related faults, joints, and folds are poorly known. The main aims of this study were (1) to identify lineaments using several remotesensing systems, (2)

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25

Taylor, Rochelle Louise. "Acoustic velocity structure of the carboneras fault zone, SE Spain." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/acoustic-velocity-structure-of-the-carboneras-fault-zone-se-spain(63a8ae72-04e3-4ab8-bf38-dc215cabbeec).html.

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The Carboneras fault zone (CFZ, Almería Province, SE Spain) is a major NE-SW trending tectonic lineament that marks part of the diffuse plate boundary between Iberia and Africa. Developed within a basement terrain dominated by mica schist, the fault system comprises two main strands within a complex zone up to 1 km wide. Between these two strands is a braided network of left-lateral strike-slip, phyllosilicate-rich fault gouge bands, ranging between 1 and 20 m in thickness, passively exhumed from up to 3 km depth. The excellent exposure in a semi-arid environment, the wide range of rock types

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26

Alten, John Michael. "Structural Analysis and brittle Deformation – Groundwater Relationships of the Rough Creek Fault Zone (RCFZ), Western Kentucky, USA." Connect to this document online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1116336135.

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Thesis (M.S.)--Miami University, Dept. of Geology, 2005.<br>Title from first page of PDF document. Document formatted into pages; contains [1], v, 72 p., [64] plates : ill. Includes bibliographical references (p. 65-71).

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27

Mercatoris, Benoît. "Multi-scale modelling of shell failure for periodic quasi-brittle materials." Doctoral thesis, Universite Libre de Bruxelles, 2010. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210194.

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<p align="justify">In a context of restoration of historical masonry structures, it is crucial to properly estimate the residual strength and the potential structural failure modes in order to assess the safety of buildings. Due to its mesostructure and the quasi-brittle nature of its constituents, masonry presents preferential damage orientations, strongly localised failure modes and damage-induced anisotropy, which are complex to incorporate in structural computations. Furthermore, masonry structures are generally subjected to complex loading processes including both in-plane and out-of-plan

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28

Kazadi, Banza Samuel-Barry. "Structural geology of the Kinsevere Copper Deposit, DRC." Diss., University of Pretoria, 2012. http://hdl.handle.net/2263/24753.

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The Kinsevere mine is a copper deposit located in the Democratic Republic of Congo (DRC), within the Central African Copperbelt. This area is situated in the Katangan basin within the SE portion of the Lufilian Arc, which is a large, arcuate structure that extends from SE Angola, across the DRC, and into NW Zambia. The purpose of this study is to characterise the brittle deformation observed around the Kinsevere copper deposit to lead to an understanding of the deformation history of the area. This is accomplished by analysing fault-slip and fold data to help understand the relationship betwee

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29

Michel, Yann. "Phénomène d'impact à haute vitesse sur cibles minces fragiles : application au projet de laser mégajoule et à la problématique des débris spatiaux." Toulouse 3, 2007. http://www.theses.fr/2007TOU30034.

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Les propriétés de transparence des verres les rendent souvent indispensables pour des systèmes optiques, mais leur incapacité à subir de grandes déformations les rend spécialement sensibles aux impacts à grande vitesse. L'objectif de cette thèse est de caractériser et de modéliser les dommages et l'éjection de matière induits par ces impacts sur des cibles minces monolithiques (EPA LMJ) ou multicouches (cellules solaires). Une partie importante de ce travail est consacrée à la caractérisation expérimentale du comportement sous choc de la silice fondue et des dommages subis par des cibles mince

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30

De, Vittorio Giancarlo. "Crack measurements in structural concrete with D.I.C. system and validation of a tensile constitutive law." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amslaurea.unibo.it/2048/.

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Compared with other mature engineering disciplines, fracture mechanics of concrete is still a developing field and very important for structures like bridges subject to dynamic loading. An historical point of view of what done in the field is provided and then the project is presented. The project presents an application of the Digital Image Correlation (DIC) technique for the detection of cracks at the surface of concrete prisms (500mmx100mmx100mm) subject to flexural loading conditions (Four Point Bending test). The technique provide displacement measurements of the region of interest and

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31

Sehr, Alexander, and Andin Eric. "A 4D Analysis of a Minor Graben Structure at Ekolsund, South Central Sweden." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-313580.

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The objective of this project is about a kinematic analysis of a shear zone, specifically a graben structure. The surface of the study area has also been investigated, this is to understand if a faulting reactivation has occurred due to glacial impact. The graben structure is exposed along a road cut, next to the E18 highway at Ekolsund, 14km east of Enköping. The results of the report are based on field studies of the geometrical relationship pattern of fracture planes, relative displacement along fracture and a kinematic analysis of movements along fractures. A high resolution terrain model

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32

Roldan, Luiz Fernando. "Tectônica rúptil meso-cenozóica na região do Domo de Lages, SC." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/44/44141/tde-31072007-155414/.

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Este trabalho tem como objetivo discutir a evolução tectônica meso-cenozóica do Domo de Lages, SC, envolvendo análise das estruturas rúpteis que afetam as rochas da região, análise morfométrica e da rede de drenagem e aspectos geomorfológicos relevantes. O Domo de Lages, localizado na borda leste da Bacia do Paraná, na porção sul do estado de Santa Catarina, é caracterizado pela ocorrência de uma grande variedade de rochas alcalinas de idade neo-cretácea. Estas rochas afloram na forma de sills e diques e são intrusivas no pacote sedimentar da Bacia do Paraná, causando-lhe um soerguimento da or

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33

Merabet, Amina. "Etude par microscopie électronique du silicium aux petites échelles : comportement mécanique et structure atomique des défauts." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0554/document.

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De récents travaux consacrés à l’étude des propriétés des matériaux aux petites échelles ont souligné des différences exceptionnelles dans le comportement mécanique des nano-objets par rapport aux matériaux massifs. Dans le cas du silicium, une transition fragile-ductile à température ambiante a été observée lorsque la taille des échantillons est réduite. Cependant, les défauts et les mécanismes à l’origine de ce changement de comportement n’ont pas été clairement identifiés. Ce travail repose sur l’étude post mortem de nanopiliers déformés, en utilisant différentes techniques de microscopie é

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34

Amorim, David Leonardo Nascimento de Figueiredo. "On the lumped damage mechanics for nonlinear structural analyses: new developments and applications." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-06042016-112414/.

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The accurate description of the nonlinear structural behaviour is an important issue in engineering science. Usually, classic nonlinear theories, such as fracture and damage mechanics, applied to finite element programmes are used to fulfil that purpose. Classic fracture mechanics describes the structural deterioration process by a few discrete cracks. This theory presents good precision for structures with simple geometries, few cracks and homogeneous materials. Classic damage mechanics measures the deterioration process by an internal variable called damage. This theory has been successful i

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35

Vadluga, Vaidas. "Nevienalyčių struktūrų dinaminio deformavimo ir irimo modeliavimas diskrečiųjų elementų metodu." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20080213_082217-82695.

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Tyrimų sritis ir darbo aktualumas. Kuriant modernias įvairios paskirties mechanines sistemas, technologijas ir įrangą, svarbiomis tampa jas sudarančios medžiagos. Savaime suprantama, kad žinomos ir naujai kuriamos medžiagos dabar kur kas išsamiau nagrinėjamos daugelyje mokslo šakų, įskaitant ir me-džiagų mechaniką. Visos medžiagos mezo- ir mikrostruktūros požiūriu yra ne-vienalytės. Jų mikroskopinės savybės skirtingos, lyginant su įprastu kontinuu-mu. Medžiagų savybėms tirti dažniausiai taikomi eksperimentiniai metodai. Eksperimentiniais metodais ištirti medžiagos struktūras ir jose vykstančiu

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36

Perrier, Malika. "Etude de la relation entre la microstructure et les propriétés mécaniques d'un acier durci par précipitation intermétallique intense : le Fer-Silicium-Titane." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00721729.

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L'amélioration des propriétés mécaniques dans les alliages du système Fer-Silicium-Titane grâce à l'introduction d'une précipitation nanométrique a été démontrée dans la littérature. La haute valeur de limite d'élasticité qui peut être atteinte dans ces aciers en fait de bons candidats pour des applications dans l'élaboration de structures automobiles. Dans ce contexte, cette étude a pour objectif de caractériser et comprendre la séquence et la cinétique de précipitation dans ces alliages, ainsi que les relations entre microstructure de précipitation et propriétés mécaniques, dans une démarche

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37

Mahé, Stéphanie. "Etude de la fracturation et de la déformation d'un massif rocheux aux abords d'une faille d'échelle crustale dans le cadre du tracé du tunnel routier de Saint-Béat." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20254/document.

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Le massif de marbres de Saint-Béat se situe dans la Zone Interne Métamorphique des Pyrénées centrales françaises. Il est formé de sédiments mésozoïques métamorphisés lors de l'événement métamorphique extensif Haute température - Basse pression classiquement décrit dans les Pyrénées. L'objet de cette thèse est de caractériser la déformation ductile et la fracturation qui affectent ce massif, et de déterminer dans quelle mesure les processus responsables de la fracturation peuvent être influencés par l'état de déformation. Les caractéristiques de la déformation des marbres et de ses roches encai

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38

Alves, Fernando Machado. "Tectônica rúptil aplicada ao estudo de aqüífero em rochas cristalinas fraturadas na região de Cotia, SP." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/44/44141/tde-02092008-150509/.

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O estudo da hidrogeologia em aqüífero cristalino fraturado apresenta como maior desafio a imprevisibilidade do meio, uma vez que o fluxo ocorre exclusivamente pelas fraturas. Neste sentido informações de atitude, abertura e conectividade de fraturas tornam-se essenciais no entendimento do fluxo da água subterrânea. O presente trabalho busca aplicar o conhecimento da tectônica rúptil para caracterizar o meio fraturado, com intuito de auxiliar o estudo hidrogeológico do aqüífero. A área de estudo está localizada na porção leste do Município de Cotia, SP, no contexto do Complexo Embu, de idade pr

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39

Ferreño, Blanco Diego. "Integridad estructural de vasijas nucleares en base a la curva patrón obtenida mediante probetas reconstruidas." Doctoral thesis, Universidad de Cantabria, 2008. http://hdl.handle.net/10803/10603.

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En esta tesis se ha caracterizado el acero, virgen e irradiado, de la vasija de una central nuclear española actualmente en servicio, en la región de temperaturas conocida como Zona de Transición Dúctil-Frágil. Para ello, se han ensayado probetas propias de la Mecánica de Fractura, reconstruidas a partir de mitades de probetas de impacto previamente ensayadas. Para describir la tenacidad a fractura en la Zona de Transición se ha empleado el modelo de la Curva Patrón.Finalmente, se ha analizado el impacto del procedimiento de caracterización y del modelo de la Curva Patrón sobre la Integridad E

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40

Ramiaramanantsoa, Tahina, Anthony F. J. Moffat, Robert Harmon та Richard Ignace. "BRITE-Constellation High-Precision Time-Dependent Photometry of the Early O-Type Supergiant ζ Puppis Unveils the Photospheric Drivers of Its Small- and Large-Scale Wind Structures". Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etsu-works/2724.

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From 5.5 months of dual-band optical photometric monitoring at the 1 mmag level, BRITE-Constellation has revealed two simultaneous types of variability in the O4I(n)fp star ζ Puppis: one single periodic non-sinusoidal component superimposed on a stochastic component. The monoperiodic component is the 1.78-d signal previously detected by Coriolis/Solar Mass Ejection Imager, but this time along with a prominent first harmonic. The shape of this signal changes over time, a behaviour that is incompatible with stellar oscillations but consistent with rotational modulation arising from evolving brig

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41

Franco, Correa Iván David. "Étude tribologique à hautes températures de matériaux céramiques structurés à différentes échelles." Thesis, Limoges, 2019. http://www.theses.fr/2019LIMO0106.

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Dans le but d’évaluer la performance et de comprendre les mécanismes d'usure, à haute température, de matériaux céramiques, de compositions chimiques différentes (Al2O3, base ZrO2, mullite), à différentes échelles de structure (finement structuré, microstructuré et submillimétrique) et de configurations différentes (monocouche, bicouche et en volume), des revêtements céramiques ont été réalisés par projection plasma à pression atmosphérique sur un substrat céramique silico-alumineux. Les revêtements d’Al2O3, de ZrO2-Al2O3 et de ZrO2- Y2O3 correspondant à la configuration monocouche ont été éla

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42

Umali, Samantha. "Role of Tyk2 in the Development of Beige Cells." VCU Scholars Compass, 2011. http://scholarscompass.vcu.edu/etd/241.

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Obesity results from an excess of adipose tissue and is a major risk factor for type 2 diabetes, cardiovascular disease, and cancer. Adipose tissue exists in two main forms: white adipose tissue (WAT), which stores energy as triglycerides, and brown adipose tissue (BAT), which dissipates stored energy as heat. White adipose tissue is composed of several subcutaneous and visceral depots, each possessing distinct molecular and functional characteristics. Brown-like adipocytes can emerge in WAT depots in response to cold or beta-adrenergic stimulation. These cells have been called “beige” or

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43

JIANG, YAO-NAN, and 江耀南. "Optimal design of brittle structures with reliability constraint." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/98402078892302947216.

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44

GIU, XIAN-GI, and 邱賢琪. "Reliability analysis of brittle structures under crack propagation." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/59060042653392879230.

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45

Brodnik, Neal Ryan. "Fracture and Toughening of Brittle Structures with Designed Anisotropy." Thesis, 2020. https://thesis.library.caltech.edu/13574/44/Brodnik_Neal_2020.pdf.

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<p>Despite good thermal and chemical properties, the use of ceramic materials in structural applications is limited by their inherently brittle nature. Efforts have been made to improve the toughness of ceramics through composite design, but recent developments in net shape processing such as additive manufacturing have significantly expanded this design space. Where composite topologies and morphologies were previously limited by material composition and thermodynamics, tools like 3D printing now allow for the design of composite structures of nearly any shape or arrangement.</p> <p>This

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46

LIN, Chao-Yan, and 林朝彥. "Study of Brittle-Ductile and Brittle Structures of Meta-Granite and Their Geological Meanings in Downstream Area of Hoping River, Hualien." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/56632257133155242425.

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碩士<br>國立臺灣師範大學<br>地球科學系<br>104<br>According to tectonic setting, the NE-trending Taiwan island is the consequence of oblique collision between the Eurasian Plate and the Philippine Sea Plate. Because the subduction flip between two plates results in the southward propagation of Okinawa Trough, the northeastern Taiwan is also influenced by the back-arc extension of the Okinawa Trough. In the northeastern Taiwan, the structural grain of the northern Backbone Range changes from northeast to east-west. Downstream area of the Hoping River, Hualien is located at the rotation axis of structural grain

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47

Wang, Yongxiang. "Extended Finite Element Methods for Brittle and Cohesive Fracture." Thesis, 2017. https://doi.org/10.7916/D8833XQ8.

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The safety of engineering structures depends heavily on the presence of cracks, which may propagate and lead eventually to structural failure. This dissertation aims to advance the computational modeling of fracture, within the context of linear elastic fracture mechanics (LEFM) and cohesive zone models (CZMs). The extended finite element method (XFEM) is employed as the discretization method and cracks in both homogeneous and bimaterial solids are considered in this work. First, a novel set of enrichment functions within the framework of XFEM is proposed for the LEFM analysis of interfa

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48

Arriaga, e. Cunha Miguel Torre do Vale. "Stability Analysis of Metals Capturing Brittle and Ductile Fracture through a Phase Field Method and Shear Band Localization." Thesis, 2016. https://doi.org/10.7916/D8RX9HPR.

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Dynamic fracture of metals is a fascinating multiphysics-multiscale problem that often results in brittle and/or ductile fracture of structural components. Additionally, under high strain rates such as impact or blast loads, a failure phenomena known as shear banding may also occur, which is a common precursor to fracture. Both fracture and shear banding are instability processes leading to strong discontinuities and strain localization, respectively. Namely, shear bands are zones of highly localized plastic deformation, while brittle/ductile cracks are material discontinuitie

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Bhattacharya, Gouri Sankar. "Simulation OF Tension Softening And Size Effect In Quasi-Brittle Materials - By Lattice And Fractal Models." Thesis, 1996. http://etd.iisc.ernet.in/handle/2005/1721.

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Balliel, Britta [Verfasser]. "Associative fear structures in PTSD refugee adolescents : insights from neurophysiological and behavioral studies / vorgelegt von Britta Balliel." 2008. http://d-nb.info/988931451/34.

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