Gotowe bibliografie tematyczne / Finite element and discrete element modelling

Gotowa bibliografia na temat „Finite element and discrete element modelling”

Autor: Grafiati

Data publikacji: 27 lipca 2024

Data aktualizacji: 29 lipca 2024

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Artykuły w czasopismach na temat "Finite element and discrete element modelling"

Chen, Xudong, i Hongfan Wang. "Slope Failure of Noncohesive Media Modelled with the Combined Finite–Discrete Element Method". Applied Sciences 9, nr 3 (10.02.2019): 579. http://dx.doi.org/10.3390/app9030579.

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Slope failure behaviour of noncohesive media with the consideration of gravity and ground excitations is examined using the two-dimensional combined finite–discrete element method (FDEM). The FDEM aims at solving large-scale transient dynamics and is particularly suitable for this problem. The method discretises an entity into a couple of individual discrete elements. Within each discrete element, the finite element method (FEM) formulation is embedded so that contact forces and deformation between and of these discrete elements can be predicted more accurately. Noncohesive media is simply modelled with assembly of individual discrete elements without cohesion, that is, no joint elements need to be defined. To validate the effectiveness of the FDEM modelling, two examples are presented and compared with results from other sources. The FDEM results on gravitational collapse of rectangular soil heap and landslide triggered by the Chi-Chi earthquake show that the method is applicable and reliable for the analysis of slope failure behaviour of noncohesive media through comparison with results from other known methods such as the smoothed particle hydrodynamics (SPH), the discrete element method (DEM) and the material point method (MPM).

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Hong, Tao, Dong Hui Wen i Ju Long Yuan. "Optimising Shot Peening Parameters Using Finite Element and Discrete Element Analysis". Applied Mechanics and Materials 10-12 (grudzień 2007): 493–97. http://dx.doi.org/10.4028/www.scientific.net/amm.10-12.493.

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Shot peening is a cold-work process in which a stream of small spherical shot is blasted against a metallic component to generate a high compressive residual stress regime at the surface of the target. This paper presents a computational modelling of the shot peening process, in which the finite element (FE) method was employed to study the elastic-plastic dynamic process of the shot impact on a metallic target, and the discrete element (DE) method was used to study the multiple particles dynamics. Statistical analyses of the shot impact data reveal the relationships between peening process parameters and peening intensity, which can be used to optimise these process parameters to produce an improved outcome.

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Zeng, Yuping, Zhifeng Weng i Fen Liang. "Convergence Analysis of H(div)-Conforming Finite Element Methods for a Nonlinear Poroelasticity Problem". Discrete Dynamics in Nature and Society 2020 (19.09.2020): 1–12. http://dx.doi.org/10.1155/2020/9464389.

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In this paper, we introduce and analyze H(div)-conforming finite element methods for a nonlinear model in poroelasticity. More precisely, the flow variables are discretized by H(div)-conforming mixed finite elements, while the elastic displacement is approximated by the H(div)-conforming finite element with the interior penalty discontinuous Galerkin formulation. Optimal a priori error estimates are derived for both semidiscrete and fully discrete schemes.

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He, Haiyan, Kaijie Liang i Baoli Yin. "A numerical method for two-dimensional nonlinear modified time-fractional fourth-order diffusion equation". International Journal of Modeling, Simulation, and Scientific Computing 10, nr 01 (luty 2019): 1941005. http://dx.doi.org/10.1142/s1793962319410058.

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In this paper, we consider the finite element method for two-dimensional nonlinear modified time-fractional fourth-order diffusion equation. In order to avoid using higher order elements, we introduce an intermediate variable [Formula: see text] and translate the fourth-order derivative of the original problem into a second-order coupled system. We discretize the fractional time derivative terms by using the [Formula: see text]-approximation and discretize the first-order time derivative term by using the second-order backward differentiation formula. In the fully discrete scheme, we implement the finite element method for the spatial approximation. Unconditional stability of the fully discrete scheme is proven and its optimal convergence order is obtained. Numerical experiments are carried out to demonstrate our theoretical analysis.

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Taforel, P., M. Renouf, F. Dubois i C. Voivret. "Finite Element-Discrete Element Coupling Strategies for the Modelling of Ballast-Soil Interaction". International Journal of Railway Technology 4, nr 2 (2015): 73–95. http://dx.doi.org/10.4203/ijrt.4.2.4.

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CHRISTIANSEN, SNORRE H. "A CHARACTERIZATION OF SECOND-ORDER DIFFERENTIAL OPERATORS ON FINITE ELEMENT SPACES". Mathematical Models and Methods in Applied Sciences 14, nr 12 (grudzień 2004): 1881–92. http://dx.doi.org/10.1142/s0218202504003854.

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We describe all operators on scalar finite element spaces which appear as the restriction of a second-order (linear) differential operator. More precisely we provide a family of isomorphisms between this space of discrete differential operators and products of some exotic finite element spaces. This provides a unified framework for the Regge calculus of numerical relativity and the Nédélec edge elements of computational electromagnetism.

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An, Huaming, Hongyuan Liu i Haoyu Han. "Hybrid Finite-Discrete Element Modelling of Excavation Damaged Zone Formation Process Induced by Blasts in a Deep Tunnel". Advances in Civil Engineering 2020 (16.07.2020): 1–27. http://dx.doi.org/10.1155/2020/7153958.

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A brief literature review of numerical studies on excavation damage zone (EDZ) is conducted to compare the main numerical methods on EDZ studies. A hybrid finite-discrete element method is then proposed to model the EDZ induced by blasts. During the excavation by blasts, the rock mass around the borehole is subjected to dynamic loads, i.e., strong shock waves crushing the adjacent rocks and high-pressure gas expanding cracks. Therefore, the hybrid finite-discrete element method takes into account the transition of the rock from continuum to discontinuum through fracture and fragmentation, the detonation-induced gas expansion and flow through the fractured rock, and the dependence of the rock fracture dynamic behaviour on the loading rates. After that, the hybrid finite-discrete element method is calibrated by modelling the rock failure process in the uniaxial compression strength (UCS) test and Brazilian tensile strength (BTS) test. Finally, the hybrid finite-discrete element method is used to model the excavation process in a deep tunnel. The hybrid finite-discrete element method successfully modelled the stress propagation and the fracture initiation and propagation induced by blasts. The main components of the EDZ are obtained and show good agreements with those well documented in the literature. The influences of the initial gas pressure, in situ stress, and spacing between boreholes are discussed. It is concluded that the hybrid finite-discrete element method is a valuable numerical tool for studying the EDZ induced by blasts in deep tunnels.

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Ransing, R. S., D. T. Gethin, A. R. Khoei, P. Mosbah i R. W. Lewis. "Powder compaction modelling via the discrete and finite element method". Materials & Design 21, nr 4 (sierpień 2000): 263–69. http://dx.doi.org/10.1016/s0261-3069(99)00081-3.

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Choi, J. L., i D. T. Gethin. "A discrete finite element modelling and measurements for powder compaction". Modelling and Simulation in Materials Science and Engineering 17, nr 3 (17.02.2009): 035005. http://dx.doi.org/10.1088/0965-0393/17/3/035005.

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Salgado, Abner J., i Wujun Zhang. "Finite element approximation of the Isaacs equation". ESAIM: Mathematical Modelling and Numerical Analysis 53, nr 2 (marzec 2019): 351–74. http://dx.doi.org/10.1051/m2an/2018067.

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We propose and analyze a two-scale finite element method for the Isaacs equation. The fine scale is given by the mesh size h whereas the coarse scale ε is dictated by an integro-differential approximation of the partial differential equation. We show that the method satisfies the discrete maximum principle provided that the mesh is weakly acute. This, in conjunction with weak operator consistency of the finite element method, allows us to establish convergence of the numerical solution to the viscosity solution as ε, h → 0, and ε ≳ (h|log h|)1/2. In addition, using a discrete Alexandrov Bakelman Pucci estimate we deduce rates of convergence, under suitable smoothness assumptions on the exact solution.

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Rozprawy doktorskie na temat "Finite element and discrete element modelling"

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.

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An effective methodology for discrete fracture in quasi-brittle material is presented within an explicit finite discrete element framework. Simple pragmatic models are envisaged that reflect the data deficiency of the quasi-brittle material and recover the observed physical response within engineering accuracy. Phenomenological strain-softening constitutive models are adopted for the modelling of micromechanical processes in an average sense. An extensional basis for fracture is assumed in both tensile and compressive stress fields, with only the mechanism with which inelastic strain is realised differing between the two stress states. To overcome the mesh dependence introduced by local softening constitutive relationships, the socalled localisation limiters are adopted in the form of the tensile crack band, nonlocal and viscous smeared crack models. Effective localisation lengthscales introduced by these regularisation methods ensure mesh objective failure localisation a priori to discrete crack insertion. A nonlocal map of failure indicators initiates fracture, with discrete cracks inserted into the finite element continuum by the splitting of the discretisation. An isotropic, non-associative Mohr-Coulomb model is derived in principal stress space as a first order approximation to the quasi-brittle response in compression. A model for discrete fracture in tensile and compressive stress fields is proposed, defined by a composite yield surface consisting of the fully anisotropic rotating crack band model coupled with the isotropic, non-associative Mohr-Coulomb model. The novel inclusion of an explicit coupling between the extensional inelastic dilation strain accrued during compressive failure and tensile strength degradation in the dilation directions permits the realisation of discrete fracturing in purely compressive stress fields. The so-called continuum-discrete transition introduces additional degrees of freedom into quasi-brittle systems and permits large deformation to be realised through the process of cataclastic flow. This advancement is considered significant and necessary in the recovery of the observed quasi-brittle response. The effectiveness of the proposed constitutive fracture models is verified by application to a number of physical quasi-brittle fracture systems, including borehole breakout, fracturing around excavations, strip punch tests, dynamic spalling and anchor pullout tests, amongst others.

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Mazor, 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.

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Dans l’industrie pharmaceutique, la granulation sèche par compactage à rouleaux est un procédé d’agglomération de poudres en granulés pour améliorer les propriétés d’écoulement nécessaire pour le procédé de compression en matrice. Comprendre le procédé de compactage à rouleaux et optimiser l’efficacité de production est limitée par l’utilisation de l’approche expérimentale à cause du coût élevé des poudres, le temps des essais et la complexité du procédé. Dans ce travail, une méthode d’éléments finis en 3D, est développée dans le but d’identifier les paramètres critiques du matériau et du procédé pour le contrôle de la qualité de la production. Le modèle de comportement de Drucker-Prager Cap est utilisé pour décrire le comportement en compression de poudres et sa calibration est déterminée à partir des essais standard. Pour surmonter la complexité liée à l’existence de deux mécanismes différents, l’alimentation en poudre par une vis sans fin et le compactage entre les rouleaux, une nouvelle méthode d’interfaçage entre la méthode des éléments discrets (DEM) employée pour décrire l’écoulement dans l’alimentation et la méthode des éléments finis (FEM) utilisée pour le compactage entre les rouleaux est développée. Enfin, pour une modélisation de compactage de rouleaux plus réaliste, prenant en compte la variation de l’entrefer entre les rouleaux, une nouvelle approche de couplage Euler-Lagrange est proposée. Les résultats de simulations par éléments finis montrent clairement l’effet des différents paramètres du procédé sur les distributions de pression et de densité dans la zone de compactage. En outre, les résultats montrent que l'utilisation de plaques de confinement de la poudre entre les rouleaux, développe une distribution de pression et de densité non homogène dans le compact, avec une densité plus élevée au centre et plus faible aux bords. D'autre part, l’utilisation de rouleaux dont l’un est surmonté d’une jante de confinement, a montré une distribution de propriétés globalement plus uniforme sur la largeur du compact avec des valeurs légèrement plus élevées aux bords qu’au centre. La méthodologie combinant les méthodes DEM & FEM montre clairement une corrélation directe entre la vitesse des particules entraînées par la vis dans la zone d’alimentation et la pression du rouleau. Tous les deux oscillent avec la même période. Cela se traduit par un compact anisotrope avec un profile de densité variant de manière sinusoïdale le long de sa largeur. Afin d'étudier la capacité du modèle à prédire les propriétés des compacts produits par compactage à rouleaux, les prédictions par simulations numériques sont comparées aux données de la littérature et validées par des mesures spécifiques
In 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

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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.

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The expression “landslide from massive rock slope failure” (MRSF) is used to indicate large-scale landslides characterised by a variety of complex initial failure processes and unpredictable postfailure behaviour. In this context, deep-seated landslides are classified as “landslides from massive rock slope failure”. Typically, deep-seated landslides are slow mountain deformations which may involve movement along discrete shear surfaces and deep seated mass creep. The long-term development of deep-seated slope deformations creates suitable conditions for the subsequent occurrence of other slope deformations. Deep-seated landslides in mountain areas can be spatially interconnected with other types of slope deformations such as debris flows, debris slides, rock avalanches, topple, translational, rotational and compound sliding and complex type of mass movements. It is to be recognized that many aspects of large-scale landslides need be investigated in order to gain the necessary confidence in the understanding and prediction of their behaviour and in the associated risk assessment. The present thesis is to contribute to such understanding with specific reference to a number of mass movements which characterize large-scale landslides. An advanced numerical technique (FDEM) which combines finite elements with discrete elements has been applied in this thesis for improving such understanding. The open source research code, called Y2D, developed at the Queen Mary, University of London by Prof. Munjiza has been used. Considering that this code has not yet been applied to slope stability problems, a series of numerical tests have been carried out to assess its suitability to properly and efficiently simulate geomechanical problems. To this purpose standard rock failure mechanisms as well as laboratory tests have been modelled first and the results obtained have been compared with available analytical and numerical solutions. The advantages of the application of FDEM has been outlined by showing that both the simulation of failure initiation and progressive development to fragmentation of the rock mass is possible as this is deposited at the slope toe. The case study of interest for this thesis is the Beauregard massive landslide located in the Aosta Valley (Northwestern Italy). At this site the presence of an extensive deep-landslide insisting on the left abutment of an arch-gravity dam is well recognised. Based on detailed studies, the investigated area has been subdivided into zones which are characterised by different geomorphologic and geostructural features. Different landslide mechanics as well as different landslide activities upstream of the dam site have been identified and studied in detail. Such an area is thought to be at an intermediate stage of development of the deep seated landslide compared with the sector which insists on the dam. The observed failure mechanism has been ascribed to a large sliding on a compound surface. Some other failure mechanisms have been recognized, such as large flexural toppling and local block toppling instability. The final part of the thesis has been devoted to the FDEM numerical modelling of a large scale failure mechanism based on brittle behaviour of the rock mass. The aim is to apply the “total slope failure” approach through the application of FDEM. Such a technique has demonstrated the significant potential in predicting the development of possible slope instability phenomena.

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Murugaratnam, 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.

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Compressive residual stresses (CRS) are beneficial for enhancing the fatigue life of metal components. Shot Peening (SP) is an industrial cold working process that is applied to induce a field of CRS and modify the mechanical properties of the metal component. The SP process involves impacting a surface with tiny shots with forces sufficient to create plastic deformation. The process is governed by a number of important parameters such as the shot size, angle of attack, initial velocity, mass flow rate and the distance from the shot nozzle to the surface being peened. The relationship between the optimal peening outcome, particularly the residual stress distribution of the treated surface, and the peening parameters is still unknown and needs to be investigated further. Manufacturers are interested in producing a uniform peening process for complex geometries which optimises the SP parameters. Modelling the process is complex as it involves the interaction of a metallic surface with a large number of shots of very small diameter. Conventionally, such problems are solved using finite element software to predict stresses and strains of a single shot impact then applying superposition. At the moment there are no Finite Element Method (FEM) modelling solutions involving more than tens of shots. The number of shots and elements required for such a modelling process made the approach unfeasible prior to the work described herein. The objective of this work is to develop an appropriate numerical modelling approach that can better simulate the real SP process. The model will be provided by combining Discrete Element Method (DEM) with FEM. The DEM is employed to get a distribution of impact velocities over space and time which are then implemented into a FEM analysis. A discrete element model with randomly distributed steel shots bombarding a steel component at various velocities has been developed as benchmark example. With this model the SP shot - shot interaction, the shot - target interaction, the surface coverage, angle of impingement, shot size, impact velocity and the overall shot flow can be parametrically studied in details and with little computational effort. The novel approach also proposes a new method to dynamically change the coefficient of restitution for repeated impacts during the simulation and predicts the CRS more effectively. The effects of SP on different materials of relevance to gas turbine engine components will be investigated in order to improve the understanding of the interaction between the shots and the targeted material. Initially, an uncoupled analysis was peforned, in order to assess the capabilities of the two modelling systems, DEM and FEM, to delivery an improved solutuion when combining two commercially available codes. This parametric analysis is performed using the state-of-the-art Discrete Element (DE) application EDEM. In the subsequent part of this work, a dynamic Finite Element (FE) application Abaqus will be used to investigate single shot impacts and to obtain the residual stress distribution. This gives us a prescribed residual stress distribution and peening coverage. A Combined DEM/FEM tool (DEST) is proposed that eliminates any manual pre-processing required for linking/coupling, eliminating the use of two different applications and provide an integrated solution for the simulation of the Shot Peening process. In the subsequent chapter, the implementation of essential tools for the enchanced modelling of Shot Peening process functionalities, such as the nozzle, bounding box, coverage and intensity is described. A number of computational improvements are also implemented to reduce the computation time. The existing binary search is enhanced to self-balancing search tree and further improved to allow insertion and deletion of elements. A bounding box feature which removes shots that move out of the domain during the course of the simulation is also implemented. Experiments featuring single shot impacts are performed to gain better understanding the deformation process in the target material subjected to impact conditions to those occurring in the production peening. The single shot impacts are experimentally examined using SEM and EBSD. During final chapter, case studies are performed to compare the results of the simulations with large-scale experimental work. The coverage of peening of single and multiple nozzles with different angle of impingements are assessed. Finally, possible directions for further research concerning the accurate quantification of material responses to SP are identified in the report.

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Kuruneru, 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.

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This thesis focuses on the development and implementation of an advanced numerical model to investigate complex fluid flow behaviour through novel metal foam heat exchangers used in various industrial applications such as computer heat sinks and air-conditioners. The developed numerical model permits engineers to better optimize heat exchanger designs. Moreover, the project delves into heat exchanger fouling which is a multifaceted issue in the industry. In this regard, a non-toxic and cost-effective anti-fouling heat exchanger fouling is proposed.

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Mezquida, 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.

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[ES] El principal objetivo de la presente tesis es el desarrollo de una completa metodología para el modelado numérico del UHPFRC desde el material hasta el elemento estructural. Se pretende contribuir al avance del conocimiento del comportamiento mecánico del UHPFRC obteniendo como resultado un procedimiento para la modelización numérica que permita el modelado y diseño estructural que permitiría hacer que este material fuera competitivo para ser utilizado en el mercado de la construcción. En la metodología de modelado propuesta, se considera un comportamiento constitutivo del UHPFRC optimizado por medio de un procedimiento directo y fiable con el que se aprovechan las ventajas del material, resultando en un diseño estructural eficiente desde el punto de vista mecánico y económico. ¿Es necesario producir SH-UHPFRC para conseguir grandes propiedades mecánicas? ¿Es posible generar SS-UHPFRC de manera que queden reducidos los costos iniciales y se mantengan unas propiedades mecánicas y de durabilidad competitivas que comporten un diseño estructural efectivo? El desarrollo de UHPFRC con bajo endurecimiento por deformación y de SS-UHPFRC puede reducir sus propiedades mecánicas, pero si son adecuadamente estudiadas y controladas, éstos podrían ser optimizados. La tesis aborda algunas de estas cuestiones a través del estudio del comportamiento a tracción que va desde SH-UHPFRC hasta SS-UHPFRC. Se pretende llevar a cabo una propuesta de procedimiento fiable para caracterizar el comportamiento constitutivo a tracción y definir un modelo numérico de elementos finitos fiable para modelar con precisión la respuesta de probetas y elementos estructurales armados de UHPFRC. Para definir el procedimiento directo para caracterizar a tracción tanto SH-UHPFRC como SS-UHPFRC, se ha llevado a cabo una campaña experimental y numérica en la que se ha analizado el resultado de ensayar 227 probetas sin armadura fabricadas con UHPFRC con cantidades de fibras cortas y lisas de acero de 120-130kg/m3 y 160kg/m3, ensayadas a flexión a través del ensayo a cuatro puntos (4PBT). El desarrollo y la validación de dicho proceso se respaldan mediante un modelo no lineal de elementos finitos (NLFEM) fiable. La validación numérica llevada a cabo ha sido decisiva para que este procedimiento sea preciso, simple y fiable. Utilizando esta campaña experimental, se ha desarrollado una aplicación predictiva para estimar los parámetros que definen el comportamiento constitutivo a tracción del UHPFRC. Esta aplicación es simple y directa y evita la posible variabilidad producida por malas interpretaciones en la aplicación del proceso. Además, se ha llevado a cabo una segunda campaña experimental constituida por vigas de UHPFRC armadas a flexión con diferentes escalas: 36 vigas cortas con 130 y 160kg/m3 de fibras y dos vigas largas. Esta campaña experimental se ha modelado con el NLFEM aquí desarrollado teniendo en cuenta efectos importantes debidos a la interacción del UHPFRC con las barras de armado. También se han modelado con el NLFEM tirantes de UHPFRC armados de una campaña experimental de otra investigación. El modelo considera efectos debidos a la retracción, al 3D y comportamiento tensión stiffening que generan resultados muy precisos cuando se comparan con los resultados experimentales. Como resultado de la presente tesis doctoral, se ha obtenido un modelo de elementos finitos capaz de modelar con precisión elementos estructurales de UHPFRC armados. Los resultados no sólo demuestran la fiabilidad del NLFEM llevado a cabo sino también la coherencia del procedimiento desarrollado para caracterizar el comportamiento constitutivo a tracción del UHPFRC para los dos casos, tanto SH-UHPFRC como SS-UHPFRC, tanto en elementos estructurales armados a flexión como en elementos estructurales armados a tracción directa. Consecuentemente se ha propuesto una metodología completa y efectiva para el modelado numérico del UHPFRC
[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
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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.

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The microstructure of polycrystalline materials crucially determines their mechanical performance in engineering applications. A multi-scale modelling approach is capable of representing the microstructure and thus capturing the material performance for various resolution requirement at different scales. Besides, the application of multi-scale modelling effectively reduces expense and improves efficiency of computations without loss of accuracy at sensitive zones. A method of concurrent coupling of planar discrete dislocation plasticity (DDP) and a crystal plasticity finite element (CPFE) method was devised for simulating plastic deformation in large polycrystals with discrete dislocation resolution in a single grain or cluster of grains for computational efficiency; computation time using the coupling method can be reduced by an order of magnitude compared to DDP. The method is based on an iterative scheme initiated by a sub-model calculation, which ensures displacement and traction compatibility at all nodes at the interface between the DDP and CPFE domains. The proposed coupling approach is demonstrated using two plane strain problems: (i) uniaxial tension of a bi-crystal film and (ii) indentation of a thin film on a substrate. The latter demonstrated that the rigid substrate assumption used in earlier discrete dislocation plasticity studies is inadequate for indentation depths that are large compared to the film thickness, i.e. the effect of the polycrystalline plastic substrate modelled using CPFE becomes important. The coupling method can be used to study a wider range of indentation depths than previously possible using DDP alone, without sacrificing the indentation size effect regime captured by DDP. A comprehensive indentation pressure formula has been developed by applying the proposed multi-scale modelling approach on a polycrystalline coating system. Planar nano-sliding and fretting calculations have been performed on thin films modelling by CPFE and DDP at different scales. Results of CPFE simulations provide an understanding of the role of microstructure on the plasticity and crack initiation during a contact problem. Beside, a new DDP computational framework has been proposed for a nano-fretting problem which is able to capture the contact size effect, simulate the dislocation evolution and predict the surface profile variation of thin films. Calculations of DDP simulations potentially provide CPFE simulations with fatigue parameters that is of more physical significance. The method is general and can be applied to any problem where finer resolution of dislocation mediated plasticity is required to study the mechanical response of polycrystalline materials, e.g. to capture size effects locally within a larger elastic/plastic boundary value problem. Also, the model described here will provide further opportunities for directly coupled, three-tiered multi-scale models compromising an overall macroscopic continua having embedded crystal plasticity and discrete dislocation plasticity models, respectively, as the length scale decreases in the area of interest. Finally, the methodology of the proposed coupling method will shed light on archiving a general compatibility of sub-regions and thus benefit other researchers who are working on coupling methods among other scales.

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Abou, 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.

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La mauvaise qualité de la couche de fondation est un défi important dans la construction de routes non revêtues. Les géosynthétiques (GSY) sont des solutions innovantes développés à partir des années 70. Selon le type de GSY utilisé, ils peuvent assurer un ou plusieurs rôles, notamment la séparation, le renforcement par les effets membrane et la stabilisation par l'imbrication des grains de sol dans les ouverture de la géogrille et/ou le frottement à l'interface sol-GSY. Il existe dans la littérature peu de méthodes de dimensionnement pour quantifier ces mécanismes, et elles présentent des limites en raison de leur calibration sur des paramètres spécifiques aux GSY et au sol utilisé et, parfois, dans des conditions de charge statique plutôt que cyclique. La complexité des mécanismes et le nombre importants de paramètres qui interviennent dans leur mise en place requirent une analyse plus poussée dans ce domaine.Pour répondre à ce problème persistant, une série d'études expérimentales et numériques a été menée. Le volet expérimental a étudié la performance du renforcement sous des charges cycliques verticales et de circulation en testant deux GTX tissés avec deux rigidités de traction différentes et deux épaisseurs de plateformes granulaires. En parallèle à l'expérimentation, un modèle numérique couplant couplant la méthode des éléments discrets et la méthode des éléments finis (à l'aide du logiciel SDEC) a été utilisé. Ce modèle visait à mettre en évidence l'impact du GSY et des paramètres du sol sur le rôle du renforcement et à fournir des données sur des phénomènes difficiles à mesurer expérimentalement.Les plots expérimentaux sont formés d'une couche de sol de fondation avec un CBR d'environ 1 %, recouverte par une plateforme granulaire compactée d'une épaisseur de 300 mm ou 500 mm. Le GTX est placé à l'interface entre la couche de fondation et la couche de base. Les résultats ont montré que, sous des charges verticales cycliques, le GTX n’apportaient pas de gain d’efficacité des plateformes de 500 mm d’épaisseur. Pour une plateforme de 300 mm d’épaisseur, les deux GTXs ont réduit de manière significative le tassement par rapport à une plateforme non renforcée de la même épaisseur (300 mm) et à une plateforme plus épaisse (500 mm). L'amélioration la plus importante a été observée avec le GTX le plus rigide. Trois essais ont été réalisés avec une charge de trafic appliquée par le Simulateur Accélérateur de Trafic (SAT). Il a été démontré que la charge de circulation exerçait une plus grande déformation dans la plateforme par rapport à la charge verticale, mais il était difficile d'arriver à une conclusion définitive sur la comparaison entre une plateforme renforcée et non renforcée.Dans le modèle numérique, une loi de comportement (1D) a été intégrée prenant en compte les variations du module de réaction du sol pendant les phases de chargement et de déchargement ainsi qu’avec les cycles, et décrivant la transition d'un comportement plastique à un comportement quasi-élastique du sol compressible. Par ailleurs, la plateforme granulaire purement frottant a montré son incapacité à supporter la charge cyclique verticale appliquée sur une plaque circulaire placée au centre du modèle. Cette limitation « numérique » a nécessité l’ajout d’une cohésion entre les particules de sol. Une fois calibré, le modèle numérique s'est avéré capable de reproduire le comportement des plates-formes renforcées par GSYs sur sol mou au cours du premier cycle et au fur et à mesure des cycles. Initialement, les efforts de frottement dépassaient l'effet membrane, mais à mesure que la déflexion augmentait avec les cycles, l'effet membrane devenait plus important. En plus, une étude paramétrique sur la compressibilité de la couche de fondation, la rigidité du GSY, le frottement à l’interface sol granulaire-GTX et les paramètres mécaniques de la couche a permis de mettre en évidence l’influence de ces différents paramètres sur les mécanismes
Poor 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

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Teixeira, Ricardo. "Computational modelling of structures using discrete and finite elements". Thesis, Swansea University, 2009. https://cronfa.swan.ac.uk/Record/cronfa42571.

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The objective of this thesis is the establishment of an objective comparison between the Finite Element Method and the Discrete Element Method when modelling the mechanical behaviour of the continuum, both for quasi-static and dynamic response. These two very different approaches to the same problem have increasingly gained popularity during the last years, becoming the distinction between the fields of application of each method each time more difficult. This research aims the assessment of the accuracy of the Discrete Element Method to solve problems that traditionally belong to the field of the Finite Element Method. This comparison has the ultimate purpose of determining the applicability of the first method to problems that involve a first stage when the material is elastic or elasto-plastic, followed by a second stage where actual physical separation of portions of the material occurs. The first part of this work comprises a review of the theoretical background and numerical techniques used to solve continuum mechanics problems using the Finite Element Method, both for quasi-static and dynamic loading. A description of the Discrete Element Method, encompassing its insights and the numerical strategies involved in its implementation constitute the second part of this work. The establishment of a methodology to model the continua using a Discrete Element Method based approach, namely the development of techniques to simulate elasto-plastic behaviour and crack path modelling, accompanied by illustrative benchmark examples, are the main pylons over which the third part of this research lays.

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Kolstad, 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.

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Brittle fracture is a large problem for steel structures in the arctic region. It is thus important to qualify materials and welds so they do not behave in a brittle manner. Since fracture testing of the heat affected zone (HAZ) around a weld gives a lot of scatter, doing weld simulated testing is proposed as an alternative method. In this thesis cracks in weld simulated HAZ specimens are compared to cracks in real welds, by use of finite element simulations. A weld simulated specimen is usually more brittle than a real weld. The goal of this thesis is thus to find a general rule for how much more brittle a weld simulated test specimen is, compared to a real weld on a structure. It would then be possible to establish how brittle a real weld is based on the result from the weld simulated testing. As a fracture criterion the Weibull stress is used, which is a statistical criterion. Crack tip opening displacement (CTOD) is used as a measure on how brittle a specimen is. To compare weld simulated specimens with real welds, two 2D modified boundary layer (MBL) models are used. One homogeneous model to represent weld simulated specimens, and one with three different materials to represent a real weld. The three materials in the weld model are base material, welded material and heat affected zone. On the two models a large parameter study is performed. The variables investigated are: - Position of the crack relative to the HAZ. - Size of the HAZ. - Geometry constraint. - Mismatch in WM. - Mismatch in HAZ. - Hardening. - The Weibull exponent m. There have also been made 3D models to investigate the size effect on the weld simulated specimen. This is because a weld simulated specimen is limited to a cross-section of $10$x$10$~mm. The parameter study concludes that it is mainly the size of the HAZ, the yield stress mismatch and the geometry constraint, that make weld simulated specimens more brittle than welds. The 3D simulations are however concluding that the geometry constraint effect can not be included, due to the size of the small test specimen. Based on these results a general relationship is proposed between the critical CTOD for a weld simulated specimen, and the critical CTOD for a real weld. There are three requirements for this relationship to be valid: - At least 10% overmatch in HAZ compared to base material. - No more than 10% undermatch in HAZ compared to welded material. - Maximal brittle HAZ thickness of 0.5 mm.

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Książki na temat "Finite element and discrete element modelling"

United States. National Aeronautics and Space Administration., red. The semi-discrete Galerkin finite element modelling of compressible viscous flow past an airfoil: Final technical report. [Washington, DC: National Aeronautics and Space Administration, 1992.

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A, Charafi, red. Finite elements using Maple: A symbolic programming approach. Berlin: Springer, 2002.

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Munjiza, Ante. The Combined Finite-Discrete Element Method. Chichester, UK: John Wiley & Sons, Ltd, 2004. http://dx.doi.org/10.1002/0470020180.

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Munjiza, Ante. The Combined Finite-Discrete Element Method. New York: John Wiley & Sons, Ltd., 2004.

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Wu, Chuan-Yu, red. Discrete Element Modelling of Particulate Media. Cambridge: Royal Society of Chemistry, 2012. http://dx.doi.org/10.1039/9781849735032.

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Wolf, John P. Finite-element modelling of unbounded media. Chichester, England: Wiley, 1996.

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Quigley, Steven Francis. Finite element modelling of semiconductor devices. Birmingham: University of Birmingham, 1988.

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Hassan, Peter J. Three dimensional discrete element modelling of soils. Ottawa: National Library of Canada, 1990.

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Części książek na temat "Finite element and discrete element modelling"

Korotov, Sergey, i Michal Křížek. "Discrete Maximum Principles in Finite Element Modelling". W Numerical Mathematics and Advanced Applications, 580–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-642-18775-9_55.

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Oliver-Leblond, C., N. Chan, F. Benboudjema i F. Ragueneau. "Weak finite-discrete element coupling for the simulation of drying shrinkage cracking in concrete". W Computational Modelling of Concrete and Concrete Structures, 613–17. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003316404-72.

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Yoshioka, Keita, Mathias Nest, Daniel Pötschke, Amir Shoarian Sattari, Patrick Schmidt i David Krach. "Numerical Platform". W GeomInt–Mechanical Integrity of Host Rocks, 63–95. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-61909-1_3.

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AbstractAn essential scientific goal of the GeomInt project is the analysis of potentials and limitations of different numerical approaches for the modelling of discontinuities in the rocks under consideration in order to improve the understanding of methods and their synergies with regard to theoretical and numerical fundamentals. As numerical methods, the “Lattice Element Method” (LEM), the non-continuous discontinuum methods “Discrete Element Method” (DEM), the “Smoothed Particle Hydrodynamics” (SPH), the “Forces on Fracture Surfaces” (FFS) as well as the continuum approaches “Phase-Field Method” (PFM), “Lower-Interface-Method” (LIE), “Non-Local Deformation” (NLD) and the “Hybrid-Dimensional Finite-Element-Method” (HDF) will be systematically investigated and appropriately extended based on experimental results (Fig. 3.1).

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Wang, Yongliang. "Adaptive Finite Element-Discrete Element Analysis for the Multistage Supercritical CO2 Fracturing and Microseismic Modelling Considering Thermal-Hydro-Mechanical Coupling". W Adaptive Analysis of Damage and Fracture in Rock with Multiphysical Fields Coupling, 137–70. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7197-8_7.

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Tejchman, Jacek. "Comparative Modelling of Shear Zone Patterns in Granular Bodies with Finite and Discrete Element Model". W Advances in Bifurcation and Degradation in Geomaterials, 255–60. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1421-2_33.

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Friswell, M. I., i J. E. Mottershead. "Finite Element Modelling". W Finite Element Model Updating in Structural Dynamics, 7–35. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8508-8_2.

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Ishak, Muhammad Ikman, i Mohammed Rafiq Abdul Kadir. "Finite Element Modelling". W Biomechanics in Dentistry: Evaluation of Different Surgical Approaches to Treat Atrophic Maxilla Patients, 37–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-32603-5_4.

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Duong, Ngoc Bich, Van Men Truong, Van Dien Tran i Minh Hung Duong. "Modelling Large Deflection of a Compliant Mechanism: A Comparative Study Using Discrete Euler Beam Constraint Model, Discrete Timoshenko Beam Constrain Model, Finite Element Method and Experiment". W Lecture Notes in Mechanical Engineering, 414–26. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-99666-6_61.

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Hill, Geoff. "Finite Element Analysis". W Loudspeaker Modelling and Design, 25–27. New York, NY: Routledge, [2019]: Routledge, 2018. http://dx.doi.org/10.4324/9781351116428-8.

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Dinkler, Dieter, i Ursula Kowalsky. "Discrete Kirchhoff –Theory Element". W Introduction to Finite Element Methods, 327–38. Wiesbaden: Springer Fachmedien Wiesbaden, 2023. http://dx.doi.org/10.1007/978-3-658-42742-9_19.

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Streszczenia konferencji na temat "Finite element and discrete element modelling"

Owen, D. R. J., Y. T. Feng, M. G. Cottrel i J. Yu. "Discrete / Finite Element Modelling of Industrial Applications with Multi-Fracturing and Particulate Phenomena". W Third International Conference on Discrete Element Methods. Reston, VA: American Society of Civil Engineers, 2002. http://dx.doi.org/10.1061/40647(259)3.

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Yang, X. S., R. W. Lewis, D. T. Gethin, R. S. Ransing i R. C. Rowe. "Discrete-Finite Element Modelling of Pharmaceutical Powder Compaction: A Two-Stage Contact Detection Algorithm for Non-Spherical Particles". W Third International Conference on Discrete Element Methods. Reston, VA: American Society of Civil Engineers, 2002. http://dx.doi.org/10.1061/40647(259)14.

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An, Huaming, Jianjun Shi, Xin Zheng i Xuguang Wang. "Hybrid Finite-Discrete Element Method Modelling of Brazilian Disc Tests". W 2016 International Conference on Civil, Transportation and Environment. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/iccte-16.2016.64.

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Orosz, Akos, Kornel Tamas, Janos P. Radics i Peter T. Zwierczyk. "Coupling Finite And Discrete Element Methods Using An Open Source And A Commercial Software". W 32nd Conference on Modelling and Simulation. ECMS, 2018. http://dx.doi.org/10.7148/2018-0399.

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Vajda, Mark Zs, Zsofia Olah i Akos Orosz. "Evaluating The Stress Field On Sweep During Tillage Process Applying Coupled Finite-Discrete Element Method". W 33rd International ECMS Conference on Modelling and Simulation. ECMS, 2019. http://dx.doi.org/10.7148/2019-0358.

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Liberatore, Laura, Marta Bruno, Omar Al Shawa, Monica Pasca i Luigi Sorrentino. "FINITE-DISCRETE ELEMENT MODELLING OF MASONRY INFILL WALLS SUBJECTED TO OUT-OF-PLANE LOADS". W VII European Congress on Computational Methods in Applied Sciences and Engineering. Athens: Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2016. http://dx.doi.org/10.7712/100016.2175.8924.

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Belhaj, Hadi Arbi, i Mokhles Mnejja. "Hydraulic Fracture Simulation of Two-phase Flow: Discrete Fracture Modelling/Mixed Finite Element Approach". W SPE Reservoir Characterisation and Simulation Conference and Exhibition. Society of Petroleum Engineers, 2011. http://dx.doi.org/10.2118/147028-ms.

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Zhang, Q., J. Yao i Z. Huang. "An Efficient Multiscale Mixed Finite Element Method for Modelling Flow in Discrete Fractured Reservoirs". W ECMOR XV - 15th European Conference on the Mathematics of Oil Recovery. Netherlands: EAGE Publications BV, 2016. http://dx.doi.org/10.3997/2214-4609.201601808.

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Coggan, John, Robert Pine, Thomas Styles i Douglas Stead. "Application of Hybrid Finite/Discrete Element Modelling for Back-Analysis of Rock Slope Failure Mechanisms". W 2007 International Symposium on Rock Slope Stability in Open Pit Mining and Civil Engineering. Australian Centre for Geomechanics, Perth, 2007. http://dx.doi.org/10.36487/acg_repo/708_15.

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Andersen, Anders H., Frederik F. Foldager, Kasper Ringgaard i Ole Balling. "Modelling Changes in the Dynamic Response of a Cantilever Beam During the Machining Process Using the Discrete Element Method". W ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-60447.

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Production of high accuracy components often involves machining processes. If the machining processes are pushed to increase productivity, it can become challenging to comply with strict tolerances and surface finish requirements. Both the finite element method and the discrete element method have been used for off-line deflection compensation and stability analysis. This contribution investigates the capabilities of a simplified discrete element model in the use for offline simulation of the dynamic behavior of a workpiece during machining. A cantilever beam is modelled and the natural frequencies are monitored as material is removed. Results are compared with theoretical frequencies and with finite element analysis. The model shows a good correspondence in the frequency behavior as material is removed compared with finite element results, though the simple discrete element model under-predicts the stiffness of the beam with approximate 5% for the first two modes.

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Raporty organizacyjne na temat "Finite element and discrete element modelling"

Zheng, Jinhui, Matteo Ciantia i Jonathan Knappett. On the efficiency of coupled discrete-continuum modelling analyses of cemented materials. University of Dundee, grudzień 2021. http://dx.doi.org/10.20933/100001236.

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Computational load of discrete element modelling (DEM) simulations is known to increase with the number of particles. To improve the computational efficiency hybrid methods using continuous elements in the far-field, have been developed to decrease the number of discrete particles required for the model. In the present work, the performance of using such coupling methods is investigated. In particular, the coupled wall method, known as the “wall-zone” method when coupling DEM and the continuum Finite Differences Method (FDM) using the Itasca commercial codes PFC and FLAC respectively, is here analysed. To determine the accuracy and the efficiency of such a coupling approach, 3-point bending tests of cemented materials are simulated numerically. To validate the coupling accuracy first the elastic response of the beam is considered. The advantage of employing such a coupling method is then investigated by loading the beam until failure. Finally, comparing the results between DEM, DEM-FDM coupled and FDM models, the advantages and disadvantages of each method are outlined.

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Gerken, Jobie M. An implicit finite element method for discrete dynamic fracture. Office of Scientific and Technical Information (OSTI), grudzień 1999. http://dx.doi.org/10.2172/751964.

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Prudencio, E. Parallel 3D Finite Element Numerical Modelling of DC Electron Guns. Office of Scientific and Technical Information (OSTI), luty 2008. http://dx.doi.org/10.2172/923310.

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Li, Tao, Xudong Qian, Hongyou Cao, Aziz Merchant, Ains Hussain, Amit Jain, Bernad A. P. Francis i Ankit Choudhary. FINITE ELEMENT MODELLING AND TEST OF A NOVEL COUPLING ARM CONNECTING TWO FLOATING BODIES. The Hong Kong Institute of Steel Construction, grudzień 2018. http://dx.doi.org/10.18057/icass2018.p.119.

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Babuska, I., i L. Li. The h-p Version of the Finite Element Method in the Plate Modelling Problem. Fort Belvoir, VA: Defense Technical Information Center, listopad 1990. http://dx.doi.org/10.21236/ada232246.

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White, D. A. Discrete time vector finite element methods for solving maxwell`s equations on 3D unstructured grids. Office of Scientific and Technical Information (OSTI), wrzesień 1997. http://dx.doi.org/10.2172/16341.

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Gunawardena, Yasoja K. R., i Farhad Aslani. FINITE ELEMENT MODELLING OF AXIALLY LOADED MILD STEEL HOLLOW SPIRAL WELDED STEEL TUBE SHORT COLUMNS. The Hong Kong Institute of Steel Construction, grudzień 2018. http://dx.doi.org/10.18057/icass2018.p.049.

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Kobayashi, Takaya, Naoki Nii, Takanobu Fujimura, Hiroshi Suganuma, Kenji Hayashi, Teruaki Inoue, Michiaki Yamamoto, Kantaro Sato i Shinobu Satonaka. Investigation and Research Into CAE Technique for Spot Weld Rupture (Part IV)~Finite Element Modelling. Warrendale, PA: SAE International, wrzesień 2005. http://dx.doi.org/10.4271/2005-08-0518.

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Hughes, Thomas J. An Assessment of Modelling Techniques for the Finite Element Analysis of Reinforced Concrete Plate and Shell Structures. Fort Belvoir, VA: Defense Technical Information Center, luty 1988. http://dx.doi.org/10.21236/ada192263.

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Ansari, S. M., E. M. Schetselaar i J. A. Craven. Three-dimensional magnetotelluric modelling of the Lalor volcanogenic massive-sulfide deposit, Manitoba. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/328003.

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Unconstrained magnetotelluric inversion commonly produces insufficient inherent resolution to image ore-system fluid pathways that were structurally thinned during post-emplacement tectonic activity. To improve the resolution in these complex environments, we synthesized the 3-D magnetotelluric (MT) response for geologically realistic models using a finite-element-based forward-modelling tool with unstructured meshes and applied it to the Lalor volcanogenic massive-sulfide deposit in the Snow Lake mining camp, Manitoba. This new tool is based on mapping interpolated or simulated resistivity values from wireline logs onto unstructured tetrahedral meshes to reflect, with the help of 3-D models obtained from lithostratigraphic and lithofacies drillhole logs, the complexity of the host-rock geological structure. The resulting stochastic model provides a more realistic representation of the heterogeneous spatial distribution of the electric resistivity values around the massive, stringer, and disseminated sulfide ore zones. Both models were combined into one seamless tetrahedral mesh of the resistivity field. To capture the complex resistivity distribution in the geophysical forward model, a finite-element code was developed. Comparative analyses of the forward models with MT data acquired at the Earth's surface show a reasonable agreement that explains the regional variations associated with the host rock geological structure and detects the local anomalies associated with the MT response of the ore zones.

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