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Dissertations / Theses on the topic 'Brittle behaviour'

Author: Grafiati

Published: 4 June 2021

Last updated: 21 February 2023

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1

Yang, Xiao-Feng. "Aspects of the mechanical behaviour of unidirectional brittle fibre-reinforced brittle matrices." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239805.

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2

Rolo, Reinaldo. "The anisotropic stress-strain-strength behaviour of brittle sediments." Thesis, Imperial College London, 2004. http://hdl.handle.net/10044/1/8239.

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3

Yu, Qifeng 1977. "Computational simulations of shear behaviour of joints in brittle geomaterials." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34003.

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The mechanical behavior of fractures in geological media is important to geotechnical and geoenvironmental engineering. Considerable investigations have been conducted on, firstly, the characterization of the fracture topography and secondly, on the assessment of the influence of fracture topography on the mechanical behavior, particularly the dilatancy of the discontinuity. The studies of the mechanical behavior of fracture surfaces have invariably been concerned with the examination of the mechanics of the contact surfaces, to the virtual exclusion of the progress of failure zones into regio

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4

Landschoff, Jannes. "Brooding behaviour in Ophioderma wahlbergii, a shallow-water brittle star from South Africa." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/13380.

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Includes bibliographical references.<br>The brooding behaviour and brooded young are described for Ophioderma wahlbergii Müller & Troschel 1842, a large, common brittle star from the coastal waters of South Africa. Twenty specimens were collected each month from June 2013 – May 2014 (n = 240). The species was found to be gonochoric.

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5

Chia, Julian Yan Hon. "A micromechanics-based continuum damage mechanics approach to the mechanical behaviour of brittle matrix composites." Thesis, University of Glasgow, 2002. http://theses.gla.ac.uk/2856/.

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The thesis describes the development of a new continuum damage mechanics (hereafter, CDM) model for the deformation and failure of brittle matrix composites reinforced with continuous fibres. The CDM model is valid over sizes scales large compared to the spacing of the fibres and the dimensions of the damage. The composite is allowed to sustain damage in the form of matrix micro-cracking, shear delamination, tensile delamination and fibre failure. The constitutive equations are developed by decomposing the composite compliance into terms attributable to the fibre and matrix, and modelling the

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6

Rangasamy, Mahendren Sharan Raj. "Thermomechanical behaviour of multi-cracked brittle media taking into account unilateral effects : theoretical and numerical approaches." Thesis, Toulouse, INPT, 2020. http://www.theses.fr/2020INPT0070.

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Dans ces travaux de thèse, des approches micromécaniques et numériques sont utilisées pour prédire les propriétés thermiques et thermoélastiques effectives d’un milieu microfissuré. Les développements sont effectués pour les cas bidimensionnel et tridimensionnel. Une attention particulière est portée à l’anisotropie induite par l’orientation des fissures et à l’effet unilatéralassocié à leur ouverture/fermeture. Plus précisément, les fissures sont modélisées comme des inclusions ellipsoïdales, sans rigidité et thermiquement isolantes dans le cas des fissures ouverteset constituées d’un matéria

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7

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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8

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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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

Brahmachari, Koushik. "Connection and flexural behaviour of steel RHS filled with high strength concrete." Thesis, View thesis, 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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11

Lechner, Philipp Johnathan [Verfasser], Wolfram [Akademischer Betreuer] Volk, Peter [Gutachter] Schumacher, and Wolfram [Gutachter] Volk. "A Material Model for Foundry Cores : The Brittle Fracture Behaviour of Chemically-Bound Foundry Sands / Philipp Johnathan Lechner ; Gutachter: Peter Schumacher, Wolfram Volk ; Betreuer: Wolfram Volk." München : Universitätsbibliothek der TU München, 2021. http://d-nb.info/1238374166/34.

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12

Dourado, Nuno Miguel. "R-Curve behaviour and size effect of a quasibrittle material : wood." Thesis, Bordeaux 1, 2008. http://www.theses.fr/2008BOR13734/document.

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Ce travail concerne des expériences mécaniques, des analyses numériques et des modélisations analytiques de la rupture cohésives (Mode I), vis-à-vis de l’étude du comportement mis en évidence par la courbe de Résistance (Courbe-R) et l’effet d’échelle de structures entaillées en bois massif. Des expériences de fissuration sont combinées à des analyses numériques pour déterminer les propriétés de rupture au moyen d’une procédure appelée Théorie de la Mécanique de la Rupture Linéaire Élastique équivalente (TMRLE), basée sur la complaisance de la structure. La courbe-R, obtenue à partir des expér

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13

Lokas, Rami (Rami Farouk) 1975. "Mechanical behavior of four brittle polymers." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/89284.

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14

Tan, Xin. "Hydro-mechanical coupled behavior of brittle rocks." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2014. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-131492.

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‘Coupled process’ implies that one process affects the initiation and progress of the others and vice versa. The deformation and damage behaviors of rock under loading process change the fluid flow field within it, and lead to altering in permeable characteristics; on the other side inner fluid flow leads to altering in pore pressure and effective stress of rock matrix and flow by influencing stress strain behavior of rock. Therefore, responses of rock to natural or man-made perturbations cannot be predicted with confidence by considering each process independently. As far as hydro-mechanical

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15

Mauduit, Damien. "Caractérisation et modélisation probabiliste de la rupture fragile de l’AlSi CE9F et d’une alumine cofrittée pour composants embarqués à applications spatiales." Thesis, Ecole nationale des Mines d'Albi-Carmaux, 2016. http://www.theses.fr/2016EMAC0010/document.

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La démarche actuelle des industries aérospatiales est de diminuer le coût de lancement des engins spatiaux par une réduction de la masse des composants. Dans l’optique de cette démarche, de nouveaux matériaux sont élaborés et permettent de satisfaire aux exigences de densification, de dissipation thermique et de réduction de masse des équipements électroniques embarqués dans les satellites. Cette thèse est une contribution à l’étude de deux de ces matériaux, l’AlSi CE9F et une nuance d’alumine cofrittée à température, destinés à réaliser des boitiers hybrides de protections de composants élect

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16

Santandrea, Mattia <1988&gt. "Bond behavior between fiber reinforced composites and quasi-brittle material interfaces." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amsdottorato.unibo.it/8645/1/Santandrea_Mattia_Tesi.pdf.

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The present dissertation presents an investigation of the bond behavior of newly developed fiber reinforced composite systems applied to quasi-brittle material interfaces. Direct shear tests were performed on steel reinforced polymer (SRP) and steel reinforced grout (SRG) composite strips applied to both concrete and masonry substrates. Different types of cementitious matrices and different densities of steel fiber sheets were employed. Tests were performed investigating several parameters, i.e. bonded width, bonded length, loading rate, and face to which the composite strip was applied. Failu

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17

Gómez, Martínez Fernando. "FAST simplified vulnerability approach for seismic assessment of infilled RC MRF buildings and its application to the 2011 Lorca (Spain) earthquake." Doctoral thesis, Universitat Politècnica de València, 2015. http://hdl.handle.net/10251/54780.

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[EN] A simplified analytical method ("FAST") for the estimation of large-scale vulnerability of Reinforced Concrete (RC) Moment Resisting Frames with masonry infills is proposed and subsequently tested by using real damage scenario caused by the 2011 Lorca earthquake as a benchmark. FAST is a spectral-based approach that allows predicting the average non-structural Damage State expected for each class of building (defined by number of storeys, age of construction, infills ratio in plan and location) for a given demand level. It accounts for non-uniformity of infills in elevation, i.e. a redu

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18

Wrzesniak, Aleksandra. "Modélisation double-échelle de la rupture des roches : influence du frottement sur les micro-fissures." Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENI104/document.

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Propagation des fissures microscopiques, est représentée par des variables d’endommagement. L’évolution de la variable d’endommagement est généralement formulée sur la base d’observations expérimentales. De nombreux modèles phénoménologiques d’endommagement ont été proposés dans la littérature. L’objet de cette thèse est de développer une nouvelle procédure pour obtenir des lois d’évolution macroscopique d’endommagement,dans lesquelles l’évolution de l’endommagement est entièrement déduite de l’analyse de la microstructure. Nous utilisons une homogénéisation basée sur des développements asympt

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19

Dean, Andrew W. "Feasibility of a New Technique to Determine Dynamic Tensile Behavior of Brittle Materials." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849768/.

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Dynamic tensile characterization of geo-materials is critical to the modeling and design of protective structures that are often made of concrete. One of the most commonly used techniques currently associated with this type of testing is performed with a Kolsky bar and is known as the spall technique. The validity of the data from the spall technique is highly debated because the necessary boundary conditions for the experiment are not satisfied. By using a technique called pulse shaping, a new “controlled” spall technique was developed to satisfy all boundary conditions so that the analyzed d

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20

Collins, William Norfleet. "Fracture Behavior Characterization of Conventional and High Performance Steel for Bridge Applications." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/70925.

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The work described herein examines the fracture behavior of steels used in bridge applications. As part of Transportation Pooled Fund (TPF) Project 5-238, Design and Fabrication Standards to Eliminate Fracture Critical Concerns in Steel Members Traditionally Classified as Fracture Critical, researchers aim to take advantage of advances made in both steel production technology and in the field of fracture mechanics. Testing and analysis of both conventional and High Performance Steel (HPS) grades of bridge steel was conducted as part of this study. This includes both Charpy V-Notch testing, as

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21

Heine, Christian P. "Simulated Response of Degrading Hysteretic Joints With Slack Behavior." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/28576.

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A novel, general, numerical model is described that is capable of predicting the load-displacement relationship up to and at failure of multiple-bolt joints in timber of various configurations. The model is not tied to a single input function and bolt holes are permitted to be drilled oversize resulting in a slack system. The model consists of five parts. A new mathematical hysteresis model describes the stiffness of the individual bolt at each time step increment and accounts for non-linear and slack behavior; a mechanically-based structural stiffness model explains the interaction of one

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22

Morgan, Stephen Philip. "The effect of complex inclusion geometries on fracture and crack coalescence behavior in brittle material." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/66868.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 139-143).<br>This research study investigates the cracking processes in a brittle material associated with inclusions of varying shape, orientation and materials. Specifically, this study summarizes a series of uniaxial compression tests on gypsum specimens with varying inclusion materials, shapes and pair configurations using high speed imagery to determine cracking behavior. The inclusions in the study co

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23

Li, Yingxiong Verfasser], Josef [Akademischer Betreuer] [Hegger, and Miroslav [Akademischer Betreuer] Vořechovský. "A modeling framework for the uniaxial behavior of brittle matrix composites / Yingxiong Li ; Josef Hegger, Miroslav Vořechovský." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1169915094/34.

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24

Li, Yingxiong [Verfasser], Josef [Akademischer Betreuer] Hegger, and Miroslav [Akademischer Betreuer] Vořechovský. "A modeling framework for the uniaxial behavior of brittle matrix composites / Yingxiong Li ; Josef Hegger, Miroslav Vořechovský." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://nbn-resolving.de/urn:nbn:de:101:1-2018102605584759776013.

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25

Carrara, Pietro [Verfasser], and H. [Akademischer Betreuer] Budelmann. "Interface behavior of fiber reinforced polymer composites externally glued to quasi-brittle substrates / Pietro Carrara ; Betreuer: H. Budelmann." Braunschweig : Technische Universität Braunschweig, 2014. http://d-nb.info/1175820091/34.

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26

LIU, JIANNING. "Understand the mechanical behaviors of polymer glasses under extension and compression." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1542042896236543.

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27

Hainey, MacKenna. "Behavior and Functional Morphology of Respiration in the Basket Star, Gorgonocephalus eucnemis and Two Brittle Stars in the Genus Ophiothrix." Thesis, University of Oregon, 2019. http://hdl.handle.net/1794/24233.

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Gorgonocephalus eucnemis, Ophiothrix suensonii and Ophiothrix spiculata are aerobic Echinoderms. Previous observations on the anatomy of these two genera state five pairs of radial shields and genital plates are responsible for regulating the position of the roof of the body disc and the flushing of water in and out of the bursae. Rates of bursal ventilation increase by an average 60-64% when the ophiuroid is exposed to an increase in food or a decrease in dissolved oxygen in Gorgonocephalus. When exposed to hypoxic oxygen concentrations O. suensonii and O. spiculata increased bursal-ventilati

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28

Errico, Carmine. "Determination of the influence of SRG anchors on the bond behavior of SRG/FRCM strips bonded to a quasi-brittle substrate." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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The use of FRCM composites (Fiber Reinforced Cementitious Matrix) is becoming more and more widespread. The inorganic matrix guarantees many advantages, especially when dealing with masonry substrates, including a good compatibility from both a physical and a chemical point of view and the lower sensitivity to debonding phenomena at the interface. Compared to FRP composites, which presents many data in the literature, FRCM composites must be studied in detail and research in this field has only begun in recent years. This work deals with an important problem: the realization of an anchorage s

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29

Tan, Xin [Verfasser], Carsten [Akademischer Betreuer] Drebenstedt, Heinz [Gutachter] Konietzky, Michael [Gutachter] Alber, and Bo [Gutachter] Liu. "Hydro-mechanical coupled behavior of brittle rocks : laboratory experiments and numerical simulations / Xin Tan ; Gutachter: Heinz Konietzky, Michael Alber, Bo Liu ; Betreuer: Carsten Drebenstedt." Freiberg : Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2014. http://d-nb.info/1220911763/34.

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30

Fahlström, Karl. "Laser welding of boron steels for light-weight vehicle applications." Licentiate thesis, Högskolan Väst, Forskningsmiljön produktionsteknik(PTW), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-7263.

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Laser beam welding has gained a significant interest during the last two decades. The suitability of the process for high volume production has the possibility to give a strong advantage compared to several other welding methods. However, it is important to have the process in full control since various quality issues may otherwise occur. During laser welding of boron steels quality issues such as imperfections, changes in local and global geometry as well as strength reduction can occur. The aspects that need to be considered are strongly depending on alloy content, process parameters etc. Th

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31

Shaikh, Adnan Muzaffar. "Study of the fracture behavior of concrete by the development and application of the nonlinear finite element code incorporating the composite damage mechanics theory for brittle materials." Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1435225.

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32

Staub, Déborah. "Étude du comportement mécanique à rupture des alumines de forte porosité : Application aux supports de catalyseurs d'hydrotraitement des résidus." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0089/document.

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La présente étude porte sur le comportement mécanique de deux types de supports de catalyseurs utilisés industriellement en hydrotraitement des résidus. Ces supports extrudés, fabriqués par IFPEN, sont constitués d’alumine de transition γ avec un taux de porosité proche de 70%. La porosité du premier matériau est uniquement constituée de mésopores (< 50 nm). La porosité du second matériau est constituée de mésopores et de macropores (jusqu’à 20 µm). Les niveaux de sollicitation en service étant très peu connus, cette étude s’attache à décrire de manière précise et exhaustive le comportement

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33

Václavík, Martin. "Predikce teplotní závislosti lomové houževnatosti." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231943.

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The thesis is focused on the prediction of the fracture toughness temperature dependence through a universal curve of fracture toughness (also known as the master curve). To determine the parameters of the universal curve of fracture toughness, values acquired from the measurement results of fracture toughness and tensile tests of structural steel P91 are used. The theoretical part is based on a summary of the relevant information from the field of fracture mechanics and brittle-ductile fracture behavior of steels that are important for the understanding of fracture-strain response of material

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34

Caisso, Camille. "Caractérisation et modélisation de la rupture dans le domaine de la transition ductile-fragile de matériaux tubulaires utilisés dans la fabrication de générateurs de gaz pour airbags." Thesis, Brest, École nationale supérieure de techniques avancées Bretagne, 2021. http://www.theses.fr/2021ENTA0014.

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Ce travail porte sur la caractérisation des mécanismes de rupture, ductile et fragile, de matériaux tubulaires utilisés pour la fabrication de générateurs de gaz pour airbag. Lors d’un accident, le coussin d’un airbag est gonflé en quelques millisecondes par un générateur de gaz. En cas de défaillance de ce dernier, un mode de rupture ductile doit être assuré jusqu’à des températures de -60°C. Un essai Charpy sur éprouvette anneau a été proposé pour quantifier le risque de rupture fragile des matériaux des générateurs de gaz. Cependant, cette modification de l’essai Charpy soulève deux problém

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35

Jakel, Roland. "Grundlagen der Elasto-Plastizität in Creo Simulate - Theorie und Anwendung." Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-87141.

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Der Vortrag beschreibt die Grundlagen der Elasto-Plastizität sowie die softwaretechnische Anwendung mit dem FEM-Programm Creo Simulate bzw. Pro/MECHANICA von PTC. Der erste Teil des Vortrages beschreibt die Charakteristika plastischen Verhaltens, unterschiedliche plastische Materialgesetze, Fließkriterien bei mehrachsiger Beanspruchung und unterschiedliche Verfestigungsmodelle. Im zweiten Vortragsteil werden Möglichkeiten und Grenzen der Berechnung elasto-plastischer Probleme mit der Software dargestellt sowie Anwendungstipps gegeben. Im dritten Vortragsteil schließlich werden verschiedene Bei

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36

Lee, Wen-Shiuann, and 李文炫. "Ductile Brittle Fracture Behaviour of Short-chain Branched Polyehtylenes." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/46589060281274875704.

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37

Kanji, Karim Mohamed Jamal. "An investigation into the mixed mode delamination behaviour of brittle composite laminates." Thesis, 2003. http://hdl.handle.net/2429/14363.

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Delamination is a prevalent composite laminate failure mode. It is of particular concern to the aerospace industry where laminated composites have found widespread usage in critical applications. Delamination growth has been widely studied, with Linear Elastic Fracture Mechanics (LEFM) being the most common approach taken to predict delamination behaviour, typically through global parameters such as specimen geometry and applied load measured away from the actual crack tip. However, internal mechanisms, such as fibre bridging, can occur within the structure thus affecting the transfer of

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38

Lisjak, Bradley Andrea. "Investigating the Influence of Mechanical anisotropy on the Fracturing Behaviour of Brittle Clay Shales with Application to Deep Geological Repositories." Thesis, 2013. http://hdl.handle.net/1807/43649.

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Clay shales are currently being assessed as possible host rock formations for the deep geological disposal of radioactive waste. However, one main concern is that the favourable long-term isolation properties of the intact rock mass could be negatively affected by the formation of an excavation damaged zone (EDZ) around the underground openings. This thesis investigated the deformation and failure process of a clay shale, namely Opalinus Clay, with particular focus on the inﬂuence of anisotropy on the short-term response of circular tunnels. To achieve this goal, a hybrid continuum-discontinuu

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39

Coulson, Adam Lee. "Investigation of the Pre to Post Peak Strength State and Behaviour of Confined Rock Masses Using Mine Induced Microseismicity." Thesis, 2009. http://hdl.handle.net/1807/19183.

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As hard rock mining progresses into higher stress mining conditions through either late stage extraction or mining at depth, the rock mass is driven not just to the peak strength, but often well into the post-peak until complete ‘failure’ occurs and easier mining conditions become evident. Limited research has been accomplished in identifying the transition of the rock mass and its behaviour into the post-peak and this research investigates this behaviour in detail. As the rock mass progressively fails, fractures are initiated through intact rock and extension and shear failure of these and pr

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40

DENG, ZHI-DA, and 鄧志達. "Ductile-brittle transition behavior of polycarbonate." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/49091597183761983287.

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41

Wen, Bin-Hwang, and 溫彬煌. "The Mechanical Behavior and Constitutive Model of Brittle Rocks." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/18993762733850365456.

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碩士<br>國立交通大學<br>土木工程學系研究所<br>85<br>A series of experimental work were carried out previously in NCTU (National Chiao - Tung University) to investigate the mechanical behavior of brittle rocks under elevated pressures and temperatures. In this study, the experimental data of triaxial compression tests is summarized and re-analyzed. Furthermore , the study develops a constitutive model to describe the mechanical behavior of brittle rocks. The experimental results show that crack-closure

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42

Tan, Xin. "Hydro-mechanical coupled behavior of brittle rocks: laboratory experiments and numerical simulations." Doctoral thesis, 2013. https://tubaf.qucosa.de/id/qucosa%3A22899.

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‘Coupled process’ implies that one process affects the initiation and progress of the others and vice versa. The deformation and damage behaviors of rock under loading process change the fluid flow field within it, and lead to altering in permeable characteristics; on the other side inner fluid flow leads to altering in pore pressure and effective stress of rock matrix and flow by influencing stress strain behavior of rock. Therefore, responses of rock to natural or man-made perturbations cannot be predicted with confidence by considering each process independently. As far as hydro-mechanical

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Lin, C. H., and 林振華. "Crazing Micro-mechanism and Superplastic Behavior of the Brittle Polymer Film by AFM." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/33401216421235177012.

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博士<br>國立清華大學<br>材料科學工程學系<br>89<br>In this thesis, the micronecking mechanism of the craze is correlated with the molecular chain network and the entanglement density of the chain network will affect the deformation of polymer thin film. In addition, a new model of the strain localization of polymer thin film is explored. By suppressing the trend of strain localization the brittle polymer thin film can be toughened and demonstrate a super-plastic behavior. The void fraction in the fully necked craze region was determined and a close-packed fibril structure was then concluded. The local stress

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Liu, Hung-wei, and 劉峵瑋. "Static and Dynamic Mechanical Behavior of Quasi-brittle Solid with Heat-driven Fracture." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/35529084885699768467.

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博士<br>國立臺灣科技大學<br>營建工程系<br>103<br>The early development of Taiwan transportation infrastructure was mostly located on the side of mountain region forming a circumferential turnpike and railway network. The rapid densification of this network continues. At present, National highway design considers environmental and economical impacts. To reduce damage to sensitive ecosystems brought on by construction, bridges and tunnels are considered to be the environmentally sustainable options. Previously, a lot of emphasis has been given to safety and economy of excavation of rock mass without particula

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wei-jen, Lin, and 林維仁. "Strain Measurements and Deformation Behavior of Brittle Material in the Split-Hopkinsion-pressure-bar Experiment." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/83176607411052352182.

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碩士<br>國防大學理工學院<br>軍事工程碩士班<br>102<br>Split Hopkinson Pressure Bar was initially applied to metallic materials. Recently, this testing method was introduced to the rock and brittle materials, such as ceramics and concrete due to its simple structure and convenience for operation. Lots of studies focused on the relationship between strength and strain rate of materials, but less studies investigated the deformation of the materials. The material strain obtained from traditional SHPB test was calculated by relative shifts between planes of elastic rod and material, and brittle materials were easil

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Chun-YiHuang and 黃鶉亦. "Effects of Strain Rate and Texture on Ductile-to- Brittle Transition Behavior of LAZ1021 Mg-Li Alloy." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/21047427707644340946.

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黃偉源. "The experimental mechanical behavior of brittle material (concretes, brick material, figuline brick) after failure under the axial pressure." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/41336577983287345222.

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碩士<br>國立彰化師範大學<br>工業教育與技術學系<br>97<br>This article coordinates instrument of the rigid test brittle materials by the 100 metric tons of universal testing machines. The brittle materials were each kind of different intensity concrete, cement mortar, figuline brick and brick of common structural. The experiment was compared with different characteristics of brittle materials that were dry and wet two conditions, beside the concrete. Concrete and brick were principal materials of the building nowadays. The purposes of study were analyzed and compared the characteristics that the experimental m

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Alam, MD Zafir. "Tensile Behavior Of Free-Standing Pt-Aluminide (PtAl) Bond Coats." Thesis, 2012. http://hdl.handle.net/2005/2531.

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Pt-aluminide (PtAl) coatings form an integral part of thermal barrier coating (TBC) systems that are applied on Ni-based superalloy components operating in the hot sections of gas turbine engines. These coatings serve as a bond coat between the superalloy substrate and the ceramic yttrium stabilized zirconia (YSZ) coating in the TBC system and provide oxidation resistance to the superalloy component during service at high temperatures. The PtAl coatings are formed by the diffusion aluminizing process and form an integral part of the superalloy substrate. The microstructure of the PtAl coatings

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Huang, Kun-Tang, and 黃崑瑭. "Mechanical Behavior of Brittle Solid in Tunnel Lining Coupling Thermal- and Load-induced Damage Associated with Acousto-optic Nondestructive Techniques." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/ekeeuh.

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碩士<br>國立臺灣科技大學<br>營建工程系<br>105<br>For investigating mechanical behaviors of tunnel structure (like tunnel lining) is subjected to a coupling of temperature (such as fire, geothermal, and the other thermal gradient) and stress (geostress and working stress) treatment. This study was focusing on the investigation of macroscopical residual mechanical behavior and microscopical fracture evolution utilizing acousto-optical nondestructive technique. The acoustical nondestructive technique is also divided by active and inactive means which is like supersonic and acoustic emission method, respectively

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