Дисертації з теми "Rock deformation Simulation methods"
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Dorner, Dorothée. "Indentation methods in experimental rock deformation." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=970154216.
Повний текст джерелаLindkvist, Göran. "Characterisation methods and simulation of deformation and failure in metal forming processes /." Luleå : Luleå University of Technology, 2010. http://pure.ltu.se/ws/fbspretrieve/4458800.
Повний текст джерелаPuttiwongrak, Avirut. "Geomechanical Studies on Fluid Flow Behaviour Influencing Rock Deformation Mechanisms of Mudstones and Sandstones." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/180488.
Повний текст джерелаPatton, William. "Modelling of unequally sampled rock properties using geostatistical simulation and machine learning methods." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2022. https://ro.ecu.edu.au/theses/2530.
Повний текст джерелаZhang, Lianyang. "Determination and applications of rock quality designation (RQD)." Elsevier/SCIENCE PRESS, 2016. http://hdl.handle.net/10150/622156.
Повний текст джерелаWang, Shuang. "A volumetric mesh-free deformation method for surgical simulation in virtual environments." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 78 p, 2009. http://proquest.umi.com/pqdweb?did=1885755951&sid=3&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Повний текст джерелаDu, Wei 1962. "Numerical modeling of mixed mode multiple crack propagation and its application to the simulation of nonlinear rock deformation and borehole breakout." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282298.
Повний текст джерелаBasnet, Shiva. "Spatial Analysis of Rock Textures." Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1349988757.
Повний текст джерелаVengeon, Jean-Marc. "Déformation et rupture des versants en terrain métamorphique anisotrope : apport de l'étude des ruines de Séchilienne." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10232.
Повний текст джерелаAben, Frans. "Experimental simulation of the seismic cycle in fault damage zones." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAU012/document.
Повний текст джерелаEarthquakes along large crustal scale faults are a huge hazard threatening large populations. The behavior of such faults is influenced by the fault damage zone that surrounds the fault core. Fracture damage in such fault damage zones influences each stage of the seismic cycle. The damage zone influences rupture mechanics, behaves as a fluid conduit to release pressurized fluids at depth or to give access to reactive fluids to alter the fault core, and facilitates strain during post- and interseismic periods. Also, it acts as an energy sink for earthquake energy. Here, laboratory experiments were performed to come to a better understanding of how this fracture damage is formed during coseismic transient loading, what this fracture damage can tell us about the earthquake rupture conditions along large faults, and how fracture damage is annihilated over time.First, coseismic damage generation, and specifically the formation of pulverized fault damage zone rock, is reviewed. The potential of these pulverized rocks as a coseismic marker for rupture mechanisms is discussed. Although these rocks are promising in that aspect, several open questions remain.One of these open questions is if the transient loading conditions needed for pulverization can be reduced by progressively damaging during many seismic events. The successive high strain rate loadings performed on quartz monzonites using a split Hopkinson pressure bar reveal that indeed the pulverization strain rate threshold is reduced by at least 50%.Another open question is why pulverized rocks are almost always observed in crystalline lithologies and not in more porous rock, even when crystalline and porous rocks are juxtaposed by a fault. To study this observation, high strain rate experiments were performed on porous Rothbach sandstone. The results show that pervasive pulverization below the grain scale, such as observed in crystalline rock, does not occur in the sandstone samples for the explored strain rate range (60-150 s-1). Damage is mainly occurs at a scale superior to that of the scale of the grains, with intragranular deformation occurring only in weaker regions where compaction bands are formed. The competition between inter- and intragranular damage during dynamic loading is explained with the geometric parameters of the rock in combination with two classic micromechanical models: the Hertzian contact model and the pore-emanated crack model. In conclusion, the observed microstructures can form in both quasi-static and dynamic loading regimes. Therefore caution is advised when interpreting the mechanism responsible for near-fault damage in sedimentary rock near the surface. Moreover, the results suggest that different responses of different lithologies to transient loading are responsible for sub-surface damage zone asymmetry.Finally, post-seismic annihilation of coseismic damage by calcite assisted fracture sealing has been studied in experiments, so that the coupling between strengthening and permeability of the fracture network could be studied. A sample-scale fracture network was introduced in quartz monzonite samples, followed exposure to upper crustal conditions and percolation of a fluid saturated with calcite for several months. A large recovery of up to 50% of the initial P-wave velocity drop has been observed after the sealing experiment. In contrast, the permeability remained more or less constant for the duration of the experiment. This lack of coupling between strengthening and permeability in the first stages of sealing is explained by X-ray computed micro tomography. Incipient sealing in the fracture spaces occurs downstream of flow barriers, thus in regions that do not affect the main fluid flow pathways. The decoupling of strength recovery and permeability suggests that shallow fault damage zones can remain fluid conduits for years after a seismic event, leading to significant transformations of the core and the damage zone of faults with time
Larsson, Karl. "Finite element methods for threads and plates with real-time applications." Licentiate thesis, Umeå universitet, Institutionen för matematik och matematisk statistik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-38198.
Повний текст джерелаAlves, José Augusto Camargo. "Estudo da conformabilidade de abas convexas da liga de alumínio AA2024-O no processo de hidroconformação de chapas." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264433.
Повний текст джерелаDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
Made available in DSpace on 2018-08-19T02:21:16Z (GMT). No. of bitstreams: 1 Alves_JoseAugustoCamargo_M.pdf: 12204746 bytes, checksum: 78b1a8db87093cdc58baaa854932096e (MD5) Previous issue date: 2011
Resumo: O processo sheet hydroform, ou hidroconformação de chapas, é realizado por meio de uma prensa composta por uma membrana de borracha, preenchido com um fluido hidráulico cuja função é atuar como uma matriz, exercendo esforços sobre uma chapa de metal (blank), que é então empurrada contra um punção rígido, fazendo-o adquirir o formato deste. Embora este processo seja amplamente utilizado para a produção de pequenos lotes de peças metálicas de formato complexo e de espessura reduzida, ele exige habilidades de quem o define, pois se por um lado pode ser visto como simples por empregar apenas um molde maciço, por outro, a ausência de um sistema macho-fêmea capaz de garantir um completo travamento do blank pode ser encarado como um problema por permitir movimentos indesejados do material, que muitas vezes resultam na formação de rugas ou outros defeitos. Baseando-se nesses conceitos, o propósito deste trabalho foi o de mapear, por meio de simulações e ensaios práticos, a conformabilidade de abas convexas da liga de alumínio AA2024-0 de quatro espessuras quando submetidas a diferentes combinações de raio de curvatura e comprimento de aba. Deste modo, foi possível definir quais combinações destes parâmetros possibilitam a obtenção de componentes conformados adequadamente, isentos de rugas e outros defeitos macroscópicos, e ainda, quais condições levam à formação de irregularidades na aba conformada acima do limite preestabelecido, exigindo o emprego de prensa-chapas especiais, também conhecidos como dams, capazes de evitar a ocorrência de tais desvios. Com base nos resultados obtidos pode-se constatar que a ocorrência de rugas está associada principalmente à altura da aba conformada e não se altera significativamente quando a espessura do blank é modificada. Além disso, foi possível notar que raios de curvaturas maiores proporcionam menores valores de deformação compressiva na região conformada, permitindo obter abas mais altas e sem rugas
Abstract: Hydroform, or sheet metal fluid forming, is performed using a fluid cell press, in which the hydraulic fluid acts on the metallic blank pushing it against the male tool, acquiring its geometry. It is widely employed to manufacture small batches of complex and low thick components. If by one point of view it can be seen as simple, involving just a single rigid block as tool, by the other hand the absence of a rigid punch in certain cases can be a limitation, since it may allow the blank to move incorrectly during the process, causing wrinkles or other macro defects. Based on this limitation, the aim of this study was to define, using computational simulations and practical tests, the shrink flange formability limit of four different thickness aluminum alloy sheets when submitted to different combinations of curvature radius and flange length. As result, it could be seen which combinations can lead the material to be formed properly and which may cause failures, requiring special blank holders, known as dams, to avoid this problems. Based on the results, it can be verified that wrinkles nucleation is mainly associated with flange height and it does not change significantly when using blanks with different thicknesses. Furthermore, it could be noted that bigger curvature radius implies in smaller compressive strain on formed region, allowing to obtain higher flanges without wrinkles in these conditions
Mestrado
Materiais e Processos de Fabricação
Mestre em Engenharia Mecânica
Moosavi, Sourena. "Initiation et propagation de la fracturation en milieu anisotrope avec prise en compte des couplages hydro-mécaniques." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0254/document.
Повний текст джерелаCurrent emphasis in petroleom industry toward increasing the reservoirs efficiency, along with the interest in exploitation of other sources of energy buried deep underground created a renewed interest in rock fracture mechanics in general and hydraulic fracturing specifically. Hydraulic fracturing, informally referred to as “fracking,” is an oil and gas well development process that typically involves injecting water, under high pressure into a bedrock formation via the well. This process is intended to create new fractures in the rock as well as increase the size, extent, and connectivity of existing fractures. However some of the very important features of this process have been overlooked. Among these neglected features one can name of inability of the vast majority of existing models to tackle at once the propagation of hydraulic fractures in fractured rocks-masses where a competing dipole mechanism exists between fracturing of the intact rock and re-activation of exiting fracture networks. Another feature that has been ignored is its intrinsically three dimensionality which is neglected by most models. Among all different types of numerical methods that have been developed in order to assess the mechanism of fracturing phenomenon very few, if any, can handle the entire complexity of such process. In the present thesis, fluid-driven crack initiation and propagation in transverse isotropic rocks is simulated using a coupled model comprising of eXtended Finite Element Method (XFEM) and cohesive zone models. The HM XFEM developed in this thesis is an extension to previous models developed introduced in multiscale hydrogeomechanics team of GeoRessources. An emphasis is put on considering the anisotropic nature of the medium and on studying its influence on the propagation path. This latter is investigated by the concept of bifurcation angle previously introduced in literature. In complementary efforts was made to have a better understanding of crack initiation in transversely isotropic media, we also used the discrete element method (DEM) in order to gain insights into the mechanisms at stake. Both methods exhibit their advantages and disadvantages in modeling fracturing phenomenon. The different nature of two methods, DEM being a discontinuous and XFEM being a continuous method, reveals potentials of both methods and renders a good comparison of which method suits the problem in hand the best, considering the the objectives of the design
Tillard, Dominique. "Etude de la rupture dans les géomatériaux cohésifs : application à la marne de Beaucaire." Grenoble 1, 1992. http://www.theses.fr/1992GRE10211.
Повний текст джерелаMoulin, Gérard. "Etat limite d'une argile naturelle : l'argile de pornic." Nantes, 1988. http://www.theses.fr/1988NANT2028.
Повний текст джерелаBaumgarten, Lars. "Gesteinsmechanische Versuche und petrophysikalische Untersuchungen – Laborergebnisse und numerische Simulationen." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2016. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-202612.
Повний текст джерелаChou, Lin-Chi, and 周令麒. "Simulation on the Creep Deformation of Rock Slopes." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/82657346751099474789.
Повний текст джерела國立屏東科技大學
水土保持系所
102
This study on the slate creep behavior in Gaoping River was performed by the discrete element method. In this paper, Based on the rockmass creep patterns by Chigira (1992) and Richard (2000) and the field observation, the essential boundary and material condition and the mechanism of the creep are studied by UDEC simulation. The bending fold of a creep rockmass occurs frequently in the lower angle jointed slope while the numerical simulation obtain the similar result. Furthermore, the creep pattern converted as under the different materials and terrain conditions. The results shows when the joints inclination angle less than 45 degrees, caused by gravity, the rock mass yields the bending fold type of creep; On the other hand, for the one’s inclination angle is greater than 45 degrees, the rock mass yields the topple on the surface of slope. In the weak rocks with strong joints condition, the rock mass will yields a bending fold; next, in the strong rock with weak joints condition, the rock mass yields a block sliding; oppositely, in the weak rock with weak joints condition, the rock mass will slide and bending along weak plane; last, the anti-dip slope with steep angle in the strong rock with weak joints, The rock mass experiences the topple and falling down to slope in block. River erosion effect is also studied by cutting the foot of river bank in several slopes in numerical model. The results show the multiple small folds occurred from the toe to top of slope under the 30 degrees of river bank. Moreover, the discrete block sliding on surface of slope, and the squeezing at toe of slope are occurring under the 45 degrees of river bank.
Dorner, Dorothée [Verfasser]. "Indentation methods in experimental rock deformation / vorgelegt von Dorothée Dorner." 2002. http://d-nb.info/970154216/34.
Повний текст джерела"Interactive soft tissue deformation in surgical simulation." Thesis, 2006. http://library.cuhk.edu.hk/record=b6074299.
Повний текст джерелаExtended from the hybrid condensed finite element model, an interactive hybrid condensed model with hardware acceleration by the graphics processing unit (GPU) is proposed. Two methods are developed in order to map the data onto the GPU in accordance with the application data structure. The performance of the primary calculation task in the solver is enhanced. Furthermore, an improved scheme is presented to conduct the newly applied forces induced by dragging or poking operations in the non-operational region.
In the thesis, new approaches to establish a physically based model for soft tissue deformation and cutting in virtual-reality-based simulators are proposed. A deformable model, called the hybrid condensed finite element model, based on the volumetric finite element method is presented. By this method, three-dimensional organs can be represented as tetrahedral meshes, divided into two regions: the operational region and the non-operational one. Different methods treat the regions with different properties in order to balance the computational time and the level of the simulation realism. The condensation technique is applied to only involve the calculation of the surface nodes in the non-operational region while the fully calculation of the volumetric deformation is processed in the operational part. This model guarantees the smooth simulation of cutting operation with the exact cutting path when users manipulate a virtual scalpel. Moreover, we discuss the relevant aspects on what affect the efficiency of implementing the finite element method, as well as the issues considered for choosing the effective solving method to our problem. Three numerical methods have been examined in our model.
Surgical simulator, which benefits from virtual reality techniques, presents a realistic and feasible approach to train inexperienced surgeons within a safe environment. It plays more and more important role in medical field and also changes the world of surgical training. Especially, the minimally invasive microsurgery, which offers patients various attractive advantages over the traditional surgery, has been widely used in otolaryngology, gastroenterology, gynecology and neurology in the last two decades.
Through the combination of these approaches, a physically based model which allows users to freely perform the soft tissue cutting and detecting, such as poking or dragging operations, with soft tissue deformation is achieved in real-time.
Wu Wen.
"August 2006."
Adviser: Pheng Ann Heng.
Source: Dissertation Abstracts International, Volume: 68-03, Section: B, page: 1745.
Thesis (Ph.D.)--Chinese University of Hong Kong, 2006.
Includes bibliographical references (p. 112-127).
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Abstracts in English and Chinese.
School code: 1307.
Glasspoole, Errol Edward. "Contribution to the analog simulation of particular dynamic phenomena in rock mass." Thesis, 2001. http://hdl.handle.net/10321/2053.
Повний текст джерелаYe, Xiao. "Computational Methods for the Analysis of Non-Contact Creep Deformation." 2012. https://scholarworks.umass.edu/theses/780.
Повний текст джерелаLee, Hee Jae engineer. "Simulation and interpretation of formation-tester measurements acquired in the presence of mud-filtrate invasion and geomechanical deformation." 2008. http://hdl.handle.net/2152/18158.
Повний текст джерелаtext
Garaga, Arunakumari. "Factors Affecting The Static And Dynamic Response Of Jointed Rock Masses." Thesis, 2008. http://hdl.handle.net/2005/772.
Повний текст джерелаBaumgarten, Lars. "Gesteinsmechanische Versuche und petrophysikalische Untersuchungen – Laborergebnisse und numerische Simulationen." Doctoral thesis, 2015. https://tubaf.qucosa.de/id/qucosa%3A23031.
Повний текст джерела