Teses / dissertações sobre o tema "Finite element and discrete element modelling"
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Klerck, Paul Alexander. "The finite element modelling of discrete fracture in quasi-brittle materials". Thesis, Swansea University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539299.
Texto completo da fonteMazor, Alon. "Modelling of roll compaction process by finiite element method". Thesis, Ecole nationale des Mines d'Albi-Carmaux, 2017. http://www.theses.fr/2017EMAC0009/document.
Texto completo da fonteIn the pharmaceutical industry, dry granulation by roll compaction is a process of size enlargement of powder into granules with good flowability for subsequent die compaction process. Understanding the roll compaction process and optimizing manufacturing efficiency is limited using the experimental approach due to the high cost of powder, time-consuming and the complexity of the process. In this work, a 3D Finite Element Method (FEM) model was developed to identify the critical material properties, roll press designs and process parameters controlling the quality of the product. The Drucker-Prager Cap (DPC) model was used to describe the powder compaction behavior and was determined based on standard calibration method. To overcome the complexity involving two different mechanisms of powder feeding by the screw and powder compaction between rolls, a novel combined approach of Discrete Element Method (DEM), used to predict the granular material flow in the feed zone and the Finite Elements Method (FEM) employed for roll compaction, was developed. Lastly, for a more realistic roll compaction modelling, allowing the fluctuation of the gap between rolls, a Coupled-Eulerian Lagrangian (CEL) approach was developed. FEM simulation results clearly show the effect of different process parameters on roll pressure and density distribution in the compaction zone of powder between the rolls. Moreover, results show that using a cheek-plates sealing system causes a nonuniform roll pressure and density distribution with the highest values in the middle and the lowest at the edges. On the other hand, the resultant pressure and density distributions with the rimmed-roll obtained higher values in the edges than in the middle and overall a more uniform distribution. The combined DEM-FEM methodology clearly shows a direct correlation between the particle velocity driven by the screw conveyor to the feed zone and the roll pressure, both oscillating in the same period. This translates into an anisotropic ribbon with a density profile varying sinusoidally along its length. To validate the results, the simulations are compared with literature and experimentally measured values in order to assess the ability of the model to predict the properties of the produced ribbons
PIOVANO, GIOVANNA. "Combined finite-discrete element modelling of key instabilities which characterise deep-seated landslides from massive rock slope failure". Doctoral thesis, Politecnico di Torino, 2012. http://hdl.handle.net/11583/2502740.
Texto completo da fonteMurugaratnam, Kovthaman. "A refined numerical modelling technique for Shot Peening". Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:43e0fa12-bf49-425b-9ba6-6b93adaa8a7e.
Texto completo da fonteKuruneru, Sahan Trushad Wickramasooriya. "A coupled finite-volume & discrete-element method to investigate particle-laden gas flows and particle deposition in metal foam heat exchangers". Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/125485/1/Sahan_Kuruneru_Thesis.pdf.
Texto completo da fonteMezquida, Alcaraz Eduardo José. "Numerical Modelling of UHPFRC: from the Material to the Structural Element". Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/167017.
Texto completo da fonte[CA] El principal objectiu de la present tesi es el desenvolupament d'una completa metodologia per al modelat numèric de l'UHPFRC des del nivell material fins arribar als elements estructurals. Es pretén contribuir a l'avanç del coneixement del comportament mecànic de l'UHPFRC per mitjà d'un procediment per al modelat numèric útil per al modelat i disseny estructural que permeta fer que aquest material siga competitiu al mercat de la construcció. En la metodologia de modelat proposta, es considera un comportament constitutiu de l'UHPFRC optimitzat per mitjà d'un procediment directe i fiable amb el qual s'aprofiten els avantatges del material, resultant en un disseny estructural eficient des del punt de vista mecànic i econòmic. És necessari produir SH-UHPFRC per a aconseguir grans propietats mecàniques? És possible generar SS-UHPFRC amb el qual queden reduïts els costs inicials mantenint unes propietats mecàniques i de durabilitat competitives que comporten un disseny estructural efectiu? El desenvolupament d'UHPFRC amb baix enduriment per deformació i de SS-UHPFRC pot reduir les seues propietats mecàniques però, si són adequadament estudiades i controlades, aquests podrien ser optimitzats. La tesi aborda algunes d'aquestes qüestions per mitjà de l'estudi del comportament a tracció de l'UHPFRC que va des de SH-UHPFRC fins SS-UHPFRC. Es pretén dur a terme una proposta de procediment fiable per a caracteritzar el comportament constitutiu a tracció i definir un model numèric d'elements finits fiable per a modelar amb precisió la resposta de provetes i elements estructurals armats d'UHPFRC. Per a definir el procediment directe per a caracteritzar a tracció tant SH-UHPFRC com SS-UHPFRC, s'ha dut a terme una campanya experimental i numèrica en la que s'ha analitzat el resultat d'assajar 227 provetes sense armadura fabricades amb UHPFRC amb quantitats de fibres curtes i llises d'acer de 120-130kg/m3 i 160kg/m3, assajades a flexió per mitjà de l'assaig a quatre punts (4PBT). El desenvolupament i la validació de l'esmentat procés són assegurats per mitjà d'un model no lineal d'elements finits (NLFEM) fiable. La validació numèrica duta a terme ha estat decisiva per a que aquest procediment siga precís, simple i fiable. Utilitzant aquesta campanya experimental, s'ha desenvolupat una aplicació predictiva per a estimar els paràmetres que defineixen el comportament constitutiu a tracció de l'UHPFRC. Aquesta aplicació és simple i directa i evita la possible variabilitat produïda per males interpretacions en l'aplicació del procés. A més a més, també s'ha dut a terme una segon campanya experimental constituïda per bigues d'UHPFRC armades a flexió amb diferents escales: 36 bigues curtes amb 130 i 160kg/m3 de fibres i dos bigues llargues de gran escala. Aquesta campanya s'ha modelat amb el NLFEM ací desenvolupat incloent efectes importants deguts a la interacció de l'UHPFRC amb les barres d'armat. Addicionalment, també s'han modelat amb el NLFEM tirants d'UHPFRC armats a tracció provinents d'una campanya experimental d'altra investigació. El model considera efectes deguts a la retracció, al 3D i comportament tensió stiffening que generen resultats molt precisos quan es comparen amb els resultats experimentals. Per tant, com a resultat de la present tesi doctoral, s'ha obtingut un model d'elements finits capaç de modelar amb precisió elements estructurals d'UHPFRC armats. Els resultats del model comparats amb els resultats experimentals no sols demostren la fiabilitat del NLFEM dut a terme sinó que també la coherència del procediment directe desenvolupat per a caracteritzar el comportament constitutiu a tracció de l'UHPFRC als dos casos, tant per a SH-UHPFRC com SS-UHPFRC, tant en elements estructurals armats a flexió com amb elements estructurals armats a tracció directa. Conseqüentment, s'ha proposat una metodologia completa i efectiva per al modelat numèric de l'UHPFRC des del niv
[EN] The main objective of the present PhD thesis is to develop a complete methodology for the numerical modelling of UHPFRC from the material level to structural elements. It intends to contribute to advanced knowledge of mechanical UHPFRC behaviour to lead to a numerically modelling proposal that is useful for structural modelling and design that allows options for this material to be competitive in the construction market. Optimised UHPFRC material constitutive behaviour, characterised by a direct reliable defined procedure, is considered in the proposed modelling methodology to take advantage of these properties, and to lead to an efficient structural design from the mechanical and economical points of view. Is it necessary to produce SH-UHPFRC to obtain excellent properties? Is it possible to develop SS-UHPFRC that leads to lower initial costs and to maintain competitive mechanical and durability properties that result in an effective structural design? The development of low strain-hardening and SS-UHPFRC would lead to reduce its mechanical properties, but they can be optimised if they are studied and controlled. The thesis addresses some of these questions by studying tensile UHPFRC behaviour to cover a wide range of tensile constitutive behaviours from SH-UHPFRC to SS-UHPFRC. It intends to propose a reliable tensile characterisation process and a reliable finite element model capable of accurately simulating the response of UHPFRC specimens and reinforced structural elements. An extensive experimental and numerical campaign with 227 unreinforced four-point bending test (4PBT) specimens with amounts of smooth-straight (13/0.20) steel fibres of 1.53-1.66% (120-130kg/m3) in volume and with 2.00% (160kg/m3), which represents SS-UHPFRC and SH-UHPFRC tensile behaviours, was carried out to set up a direct tensile characterisation procedure involving SS-UHPFRC and SH-UHPFRC. The direct procedure's development and validity are ensured by a reliable non-linear finite element model (NLFEM). Numerical validation was carried out and is decisive for performing the direct procedure to characterise the tensile behaviour of both SS and SH-UHPFRC herein developed accurately, simply and reliably. With the experimental programme herein, a predictive application for estimating tensile UHPFRC parameters was developed. The prediction offers reliable results. The application is simple and direct, and avoids variability in the characterisation procedure due to possible misinterpretations in its application. In addition, a second experimental programme, which includes reinforced concrete flexural beams on different scales, with 36 UHPFRC reinforced short beams with 130 and 160kg/m3 of steel fibres and two full-scale long beams, was carried out and modelled with the NLFEM herein developed including major effects due to the interaction between UHPFRC and reinforcement bars. Additionally, reinforced UHPFRC tensile bars from a recent experimental campaign performed by other researchers were modelled with the NLFEM. The model considers shrinkage effects, tension stiffening behaviour and 3D effects due to the particularities of the test, which provide very accurate results compared to those obtained with the experimental tests. As a result of this PhD thesis, an accurate NLFEM was obtained to model reinforced UHPFRC structural elements. The results of the model compared to the experimental ones demonstrate not only the reliability of the developed NLFEM, but also the coherence of the developed direct procedure to characterise tensile UHPFRC behaviour in both strain-softening and strain-hardening in reinforced flexural and direct tensile structural elements. Consequently, a complete and effective methodology for numerical UHPFRC modelling from the material level to structural elements is proposed.
Mezquida Alcaraz, EJ. (2021). Numerical Modelling of UHPFRC: from the Material to the Structural Element [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/167017
TESIS
Xu, Yilun. "On the development of a multi-scale modelling framework to study plasticity and damage through the coupling of finite element crystal plasticity and discrete dislocation plasticity". Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/52630.
Texto completo da fonteAbou, Chaz Nisrine. "Etudes expérimentale et numérique des plateformes granulaires renforcées par géosynthétiques sur sol mou". Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALI031.
Texto completo da fontePoor subgrade quality is a pervasive challenge in the construction of unpaved roads. Geosynthetics (GSYs) have emerged as innovative solutions since their initial usage in the late 1970s. Depending on the type of GSY employed, they can fulfil one or several roles, including separation, reinforcement by tensioned membrane effects, and stabilization by interlocking and/or friction at the soil-GSY interface. Few design methods exist in the literature to quantify these mechanisms, but they have limitations due to their calibration on specific GSY and soil parameters and, at times, under static rather than cyclic loading conditions. The various factors and parameters that influence the dominant mechanism and its corresponding contribution to platform enhancement underscore the necessity for further exploration in this area.To address this persistent issue, a series of experimental and numerical studies were conducted. The experimental part studied the performance of reinforcement under cyclic vertical and traffic loadings using two woven geotextiles (GTXs) with two different tensile stiffness and two base course thicknesses. Additionally, alongside the experimentation, a numerical model coupling the discrete element method and the finite element method (using Software-Defined Edge Computing) was employed. This model aimed to showcase the impact of GSY and soil parameters on reinforcement performance and provide insights into aspects challenging to measure through experimentation.The tested unpaved road sections are composed of a subgrade layer with a CBR around 1% covered by a compacted base course layer with thickness of 300 mm or 500 mm. The GTXs are placed at the interface between the subgrade and the base course layers. The results showed that the 500 mm base course reinforced platform did not exhibit reinforcement effects under vertical cyclic loading. However, the use of a 300 mm base course with GTX significantly reduced settlement compared to an unreinforced base course of the same thickness (300 mm) and to the thicker base course (500 mm). The most important improvement was observed with the highest-stiffness GTX. Moreover, three tests were performed under traffic loading applying by the Simulator Accelerator of Traffic (SAT). It was shown that traffic loading exerted greater deformation in the base course layer compared to vertical loading, but definitive conclusion can hardly be reached about the comparison between reinforced and unreinforced platform.In the numerical model, a behavioural law (1D) was integrated, considering the variation of the soil reaction modulus during loading and unloading phases and with cycles, and describing the transition of the soil from plastic to quasi-elastic behavior. In addition, the purely frictional base course layer revealed its incapacity to sustain the loading applied in the experimental. This inherent limitation prompted the incorporation of adhesion between soil particles to rectify this shortcoming in load-bearing capacity. Once calibrated the numerical model proved capable of accurately replicating the behavior of GTX-reinforced platforms in the first cycle and with cycles. It facilitated a quantification of the GTX friction effort and GTX tension effort with cycles. Initially, frictional forces outweighed the tensioned membrane effect, but as deflection increased with cycles, the latter became more prominent. This dynamic highlighted a diminishing dominance of the soil confinement mechanism with cycles, giving way to the increasing significance of the membrane effect. Furthermore, the subgrade softness, the GTX rigidity, the mattress-GTX interface parameters and the base course mechanical parameters influenced the behavior of the model
Teixeira, Ricardo. "Computational modelling of structures using discrete and finite elements". Thesis, Swansea University, 2009. https://cronfa.swan.ac.uk/Record/cronfa42571.
Texto completo da fonteKolstad, Gaute Thorson. "Finite Element Modelling of Weldments". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for produktutvikling og materialer, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19322.
Texto completo da fonteLu, Mingfei. "Discrete element modelling of railway ballast". Thesis, University of Nottingham, 2008. http://eprints.nottingham.ac.uk/10611/.
Texto completo da fonteBrown, Nicholas John. "Discrete element modelling of cementitious materials". Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8011.
Texto completo da fonteMarooden, S. "Discrete element modelling of concrete behaviour". Thesis, University of Liverpool, 2018. http://livrepository.liverpool.ac.uk/3024665/.
Texto completo da fonteKarmi, M. S. "Finite/discrete element analyses of masonry structures". Thesis, Swansea University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637762.
Texto completo da fontePires, F. M. A. "Issues on the finite element modelling". Thesis, Swansea University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638539.
Texto completo da fonteBayrakdar, Haluk. "Finite element modelling of transportation tunnels". Thesis, Durham University, 1995. http://etheses.dur.ac.uk/5175/.
Texto completo da fonteKnock, Clare. "Finite element modelling of estuarine hydrodynamics". Thesis, University of the West of England, Bristol, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.258716.
Texto completo da fonteDatta, Kanyakumari. "Finite element modelling of hot rolling". Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242200.
Texto completo da fonteAdam, Alexandros. "Finite element, adaptive spectral wave modelling". Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/45307.
Texto completo da fonteBates, Paul David. "Finite element modelling of floodplain inundation". Thesis, University of Bristol, 1992. http://hdl.handle.net/1983/edf8eb51-e701-4c18-a482-7f0dac785f84.
Texto completo da fonteLee, York Wei. "Discrete element modelling of idealised asphalt mixture". Thesis, University of Nottingham, 2006. http://eprints.nottingham.ac.uk/11720/.
Texto completo da fonteWessling, Albin. "Towards Discrete Element Modelling of Rock Drilling". Licentiate thesis, Luleå tekniska universitet, Material- och solidmekanik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-83911.
Texto completo da fonteRostand, Virgile. "Analysis of discrete finite element shallow-water models". Doctoral thesis, Québec : Université Laval, 2007. http://www.theses.ulaval.ca/2007/24911/24911.pdf.
Texto completo da fonteConnell, M. A. "Virtual reality simulations for finite/discrete element problems". Thesis, Swansea University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636282.
Texto completo da fonteSwarbrick, Sean James. "Finite element simulation of viscoelastic flow". Thesis, Teesside University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278423.
Texto completo da fonteChu, Pengbo. "Discrete element method modelling of pulp lifter performance". Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=106300.
Texto completo da fonteL'assemblage du releveur de pates est l'une des composantes importantes à la sortie de grille termine-décharge des broyeurs. Il décharge des matériaux broyés à travers le tourillon de la décharge comme une pompe centrifuge fonctionnant en sens inverse à celui requis par une pompe. Bien qu'il soit largement connu conventionnels associés de pâte de conception lifter avec des inconvénients qui causent opération de décharge inefficaces, peu de travaux ont été fait pour comprendre les causes de cet événement particulier. Dans le but de mieux comprendre les effets des différentes conceptions du releveur pates sur la performance de décharge et également établir des stratégies pour la conception et l'exploitation futures d'un tel équipement, ce travail est lancé.Trois types de conceptions de releveur de pates d'industrie à l'échelle ont été étudiés, y compris deux conceptions classiques et un nouveau design, à l'aide de technique de modélisation méthode des éléments discrets (MED). Les performances de décharge de ces dessins ont été évalués en fonction de trois critères, qui comprennent le taux de décharge, la consommation d'énergie, et flow-back/carry-over. Les résultats ont montré que l'assemblage de pâte-lève comprenant des bras radiaux conçus en spirale possède une meilleure performance que celle de décharge avec des bras radiaux droits. Les performances de décharge de trois types de conceptions sont également trouvés à être sensibles à certains paramètres spécifiques de conception et d'exploitation, telles que le nombre d'aubes, la vitesse de rotation moulin, la taille des particules, et les coefficients de frottement. Basé sur les résultats, cinq lignes directrices sur la conception et le fonctionnement futurs de l'assemblage pâte-lève ont été établis.
Kukula, S. J. "Finite element modelling of delaminations in composites". Thesis, Imperial College London, 1993. http://hdl.handle.net/10044/1/7711.
Texto completo da fontePower, Philip William. "Error measures for finite element ocean modelling". Thesis, Imperial College London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485614.
Texto completo da fontePiefort, Vincent. "Finite element modelling of piezoelectric active structures". Doctoral thesis, Universite Libre de Bruxelles, 2001. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211645.
Texto completo da fontePamudji, Rahardjo A. "Finite element modelling of river bed dynamics". Thesis, Swansea University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638405.
Texto completo da fonteKabir, Saiful. "Finite element modelling of photonic crystal fibres". Thesis, City University London, 2007. http://openaccess.city.ac.uk/8592/.
Texto completo da fonteHiett, Ben. "Photonic crystal modelling using finite element analysis". Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274031.
Texto completo da fonteAbosaf, Mohamed. "Finite element modelling of multi-point forming". Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8012/.
Texto completo da fonteMayne, David A. "Finite element modelling of cohesive sediment transport". Thesis, University of Edinburgh, 2000. http://hdl.handle.net/1842/15300.
Texto completo da fonteConradie, Johan. "Finite Element Modelling of Off-Road Tyres". Diss., University of Pretoria, 2014. http://hdl.handle.net/2263/45957.
Texto completo da fonteDissertation (MEng)--University of Pretoria, 2014.
tm2015
Mechanical and Aeronautical Engineering
MEng
Unrestricted
Nishiyama, Kenta. "Analysis of Soil-Tire Interaction Using a Two-Dimensional Finite Element-Discrete Element Method". Kyoto University, 2019. http://hdl.handle.net/2433/245298.
Texto completo da fonteUnosson, Mattias. "On failure modelling in finite element analysis : material imperfections and element erosion". Doctoral thesis, Linköping : Linköpings universitet, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-4679.
Texto completo da fonteAl-Harbi, Hamad F. "Crystal plasticity finite element simulations using discrete Fourier transforms". Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/51788.
Texto completo da fonteSantasusana, Isach Miquel. "Numerical techniques for non-linear analysis of structures combining discrete element and finite element methods". Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/404120.
Texto completo da fonteAquest treball comprèn una àmplia revisió dels aspectes bàsics del Mètode dels Elements Discrets (DEM) per a la seva aplicació genèrica en problemes que involucren la manipulació i transport de material granular posant èmfasi en els temes de la interacció partícula-estructura i la simulació de materials cohesius. Per una banda, s'ha desenvolupat un algoritme especialitzat en la detecció de contactes entre partícules esfèriques que representen el medi granular i els elements finits que conformen una malla de superfície en el modelatge d'estructures rígides. El mètode, anomenat "Double Hierarchy Method", suposa una millora en l'estat de l'art existent al solucionar els problemes que deriven del contacte en regions de transició no suau i en casos amb múltiples contactes. Aquest tema és posteriorment estès al contacte amb estructures deformables per mitjà de l'acoblament entre el DEM i el Mètode dels Elements Finits (FEM) el qual governa la solució de mecànica de sòlids en l'estructura. Per a fer-ho, es descriu un procediment pel qual les forces de contacte, que es calculen en les partícules, es transfereixen de forma consistent als nodes que formen part de l'estructura o sòlid en qüestió. Per altra banda, un model desenvolupat per Oñate et al. per a modelar materials cohesius mitjançant el DEM és analitzat numèricament per tal d'extreure conclusions sobre les seves capacitats i limitacions. En paral·lel als desenvolupaments teòrics, un dels objectius de la tesi és proveir al partner industrial del programa doctoral, CITECHSA, d'un software anomenat DEMpack (http://www.cimne.com/dem/) que permeti aplicar l'acoblament DEM-FEM en projectes d'enginyeria reals. Una de les aplicacions remarcables dels desenvolupaments en el marc de la tesis ha estat un projecte per l'empresa Weatherford Ltd. que involucra la simulació de tests en provetes de materials cimentosos tipus formigó. Aquesta tesis doctoral s'emmarca en la primera promoció (2012-2013) del programa de Doctorats Industrials de la Generalitat de Catalunya. La proposta de tesi prové de l'acord entre l'empresa CITECHSA i el centre de recerca CIMNE de la Universitat Politècnica de Catalunya (UPC).
Yan, Beichuan. "Three-dimensional discrete element modeling of granular materials and its coupling with finite element method". Connect to online resource, 2008. 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:3315830.
Texto completo da fonteGeng, Yan. "Discrete element modelling of cavity expansion in granular materials". Thesis, University of Nottingham, 2010. http://eprints.nottingham.ac.uk/11858/.
Texto completo da fonteMak, K. W. "Discrete element modelling of particulate systems for industrial applications". Thesis, Swansea University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637985.
Texto completo da fonteBergström, Per. "Modelling Mechanics of Fibre Network using Discrete Element Method". Licentiate thesis, Mittuniversitetet, Avdelningen för kemiteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-34640.
Texto completo da fonteVid tidpunkten för framläggningen av avhandlingen var följande delarbeten opublicerade: delarbete 2 och 3 (manuskript).
At the time of the defence the following papers were unpublished: paper 2 and 3 (manuscript).
Runnemalm, Henrik. "Efficient finite element modelling and simulation of welding". Doctoral thesis, Luleå, 1999. http://epubl.luth.se/1402-1544/1999/20/index.html.
Texto completo da fonteElkhouri, Nidal. "Finite-element modelling of the gerbil middle ear". Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=98957.
Texto completo da fonteThe behaviour of the finite-element model in response to a static pressure of 1 Pa is analyzed. Overall, the model demonstrates good agreement with low-frequency experimental data. For example, (1) the ossicular ratio is found to be about 3.5; (2) maximum footplate displacements are about 34.2 run +/- 0.04 nm; (3) the motion of the stapes is predominantly piston-like; (4) the displacement pattern of the eardrum shows two points of maximum displacements, one in the posterior region and one in the anterior region. The results also include a series of sensitivity tests to evaluate the significance of the different parameters in the finite-element model. Finally, in an attempt to understand how the overall middle-ear mechanics is influenced by the anterior mallear ligament and the posterior incudal ligament, results are shown for cutting or stiffening the ligaments.
Mikhael, Chadia. "Finite-element modelling of the human middle ear". Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82619.
Texto completo da fonteThe aim of our work was to build an accurate human middle-ear finite-element model that is based on accurate geometry and a priori material-property estimates.
A human temporal-bone specimen was obtained for which the middle-ear response had been measured by means of laser Doppler vibrometry. High-resolution micro-computed tomography data for the specimen were used for accurately defining structure geometry. This model comprises the tympanic membrane, the ossicles, two joints, and four ligaments. We assigned estimated material-property values derived from the literature.
We compared the response of our model with those of other human middle-ear models, and with experimental measurements including those from the same ear. Sensitivity of the model to several of its parameters was also investigated.
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