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Статті в журналах з теми "Homogénéisation continue ou discrète":
Larrivée, Pierre. "Le registre comme continuum. L’interaction entre proximité de l’échange et hiérarchie d’accessibilité." SHS Web of Conferences 78 (2020): 14002. http://dx.doi.org/10.1051/shsconf/20207814002.
Antoine, Jean-Pierre. "L'analyse en ondelettes." Revue des questions scientifiques 189, no. 1-2 (January 1, 2018): 5–49. http://dx.doi.org/10.14428/qs.v189i1-2.68713.
Matamoros, Isabelle. "Savantes ou dilettantes ?" Histoire et civilisation du livre 19 (September 26, 2023): 57–77. http://dx.doi.org/10.47421/hcl_19_57-77.
Le Botlan, D. "Applications de la résonance magnétique nucléaire (RMN) en milieu poreux Lissage des courbes de relaxation RMN du domaine du temps par une méthode discrète et continue." Revue de l'Institut Français du Pétrole 53, no. 4 (July 1998): 483–87. http://dx.doi.org/10.2516/ogst:1998040.
Roddy, Kate. "Recasting Recantation in 1540s England: Thomas Becon, Robert Wisdom, and Robert Crowley." Renaissance and Reformation 39, no. 1 (April 26, 2016): 63–90. http://dx.doi.org/10.33137/rr.v39i1.26543.
Porphyre, Vincent, and Denis Bastianelli. "Editorial - L'élevage porcin dans les pays tropicaux." Revue d’élevage et de médecine vétérinaire des pays tropicaux 71, no. 1-2 (February 9, 2019): 3. http://dx.doi.org/10.19182/remvt.31682.
Pujante González, Domingo. "Apertura: No hay palabras..." HYBRIDA, no. 5(12/2022) (December 27, 2022): 3. http://dx.doi.org/10.7203/hybrida.5(12/2022).25813.
Дисертації з теми "Homogénéisation continue ou discrète":
Verna, Patrice. "Modélisation continue des structures discrètes par homogénéisation : cas des treillis." Grenoble INPG, 1991. http://www.theses.fr/1991INPG0012.
Alavi, Seyed Ehsan. "Homogénéisation de milieux architecturés périodiques et quasi-périodiques vers des milieux continus généralisés." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0305.
This thesis aims to revisit higher-order homogenization schemes towards higher-order or higher gradient continua, successively for periodic and quasi-periodic architected materials and composites, based on variational principles and an extension of Hill macrohomogeneity condition. Continuous homogenization methods are exposed in Part I for micropolar and micromorphic media, followed by an exposition of the alternative discrete homogenization method.We have extended these theoretical developments to the situation of quasi-periodic materials, which still have a regular microstructure. The common idea to the proposed periodic homogenization methods of continuous or discrete nature is to split the microscopic displacement into a homogeneous part representative of the kinematics of the adopted effective continuum and a fluctuation evaluated from a variational principle. In substance, the theoretical developments allow the elaboration of enriched continua (generalized continua) of micromorphic type and all sub continua obtained using suitable degeneration conditions. Numerical applications have been made for architected materials and inclusion-based composites prone to higher-order effects due to their inner architecture. On the theoretical framework, the performed developments remedy many existing limitations of existing higher-order homogenization schemes.In Part II, repetitive lattice materials' effective classical and higher-order mechanical properties have been evaluated based on discrete homogenization schemes. Following the idea of a phenomenological approach, consistent couple stress models of repetitive beam lattices have been elaborated. Enriched Cosserat media have been derived in the spirit of micromechanics, adopting Timoshenko beam models at a microlevel, and applying a continualization method towards a Cosserat effective substitution medium. The proposed continualization method proves to be accurate and computationally efficient compared to continuous homogenization schemes and fully resolved finite element simulations. One key outcome of the performed analyses is the quantification of edge effects in the response of lattice structures, relying on the surface formulation of the extended Hill macrohomogeneity condition.The theoretical background underlying quasi-periodic asymptotic homogenization in the framework of linearized anisotropic elasticity deserves the development of Part III. Different methodologies for evaluating the effective quasi-periodic properties have been elaborated, leading to the emergence of strain gradient effective media. Conformal transformations define a specific class of geometrical mappings, allowing for designing compatible architected materials with inner porosity gradient, making them suitable bone biomechanics candidates
Chesnais, Céline. "Dynamique de milieux réticulés non contreventés : application aux bâtiments." Phd thesis, Ecole Centrale de Lyon, 2010. http://tel.archives-ouvertes.fr/tel-00564489.
Fennan, Abdelhadi. "Homogénéisation élastoplastique discrète." Ecully, Ecole centrale de Lyon, 1995. http://www.theses.fr/1995ECDL0016.
The aim of this work is to understand and modelling the behaviour of heterogenous elastoplastic materials or more generally elasto-dissipative. To achieve his goal, a discret homogenization method is developped. Three main independent steps have to be implemented : 1- residual homogenization, a purelly elastic step, which allows the evaluation of localization operators. 2- formulation of a macroscopic model from the local behaviour. 3- the study of the macroscopic behaviour, independently of the elementary microscopic structure. This method can be used in many local rheological cases and leads to approximate, but complete and explicit, behaviour law. The macroscopic phenomenological model obtained is a standard generalized model with multiple kinematic hardening showing a discrete spectrum of internal variables. This model takes account the induced anisotropy resulting from microscopic heterogenity. Dealing with the applications and the link with micro-structure, two examples are treated : the cellular structures of dislocations developping in metals by cyclic loadings ; the metalic matrix composites with particulate reinforcement
Delorme, Matthieu. "Ecoulements en milieux fracturés : vers une intégration des approches discrètes et continues." Thesis, Toulouse, INPT, 2015. http://www.theses.fr/2015INPT0038/document.
Fluid flow simulation is used to optimize oil and gas production. Naturally or hydraulically fractured reservoirs hold a significant part of reserves, difficult to assess. Fractures may create preferential flow paths heavily impacting fluid flow. Accurate modeling of fractured media accounting for strong contrasts would allow operators to optimize resources exploitation while better controlling environmental risks. Integrating sparse available data, we aim at predicting fluid flow processes occurring in the earth’s subsurface accounting for multi-scale fractures with a simply parameterized model. Improving the computational time and results reliability, we propose a full integrated strategy suitable for fractured reservoir specificities by simulating the fractures complexity on large scales. The techniques developed in this thesis, whose interest is demonstrated in an unconventional field case study, can find other applications in geothermal engineering and water resources management
Goda, Ibrahim. "Micromechanical models of network materials presenting internal length scales : applications to trabecular bone under stable and evolutive conditions." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0055/document.
A methodology based on micromechanics has been developed to determine the effective behavior of network materials endowed with a discrete architecture at the microscopic level. It relies on the discrete homogenization method, which has been applied to textile monolayers and trabecular bones. The initially discrete topology of the considered network materials results after homogenization at the mesoscopic level in anisotropic micropolar effective continuum, which proves able to capture the observed internal scale effects. Such micromechanical methods are useful to remedy the difficulty to measure the effective mechanical properties at the intermediate mesoscopic level scale. The bending and torsion responses of vertebral trabecular bone beam specimens are formulated in both static and dynamic situations, based on the Cosserat theory. 3D models have been developed for describing the multiaxial yield and brittle fracture behavior of trabecular bone, including the analysis of size-dependent non-classical plastic yield. We have constructed by FE analyses a homogeneous, orthotropic couple-stress continuum model as a substitute of the 3D periodic heterogeneous cellular solid model of vertebral trabecular bone, based on the equivalent strain energy approach. Bone tissues are able to adapt their local density and load bearing capacities as well as their size and shape to mechanical stimuli. We have developed models for combined internal and external bone remodeling in the framework of the thermodynamics of irreversible processes, at both the cellular and macroscopic levels. We lastly combined anisotropic internal remodeling with fatigue continuum damage
Landry, Jean-François. "Planification optimale discrète et continue : un joueur de billard autonome optimisé." Thèse, Université de Sherbrooke, 2012. http://hdl.handle.net/11143/6681.
Moreau, Gabriel. "Homogénéisation de structures discrètes en élasticité et en incrémental : applications aux modélisations continues linéaires et non-linéaires de treillis quasi-périodiques." Grenoble INPG, 1996. https://tel.archives-ouvertes.fr/tel-01762234.
Yahya, Farouk. "Approche couplée discrète - continue adaptative pour la mise en forme des métaux." Electronic Thesis or Diss., Valenciennes, Université Polytechnique Hauts-de-France, 2023. http://www.theses.fr/2023UPHF0042.
The development of forming processes generally involves numerical simulation, particularly using the Finite Element Method, to detect, among other things, potential risks of cracking and their propagation, both in the forged piece and in the tooling.The classical Finite Element Method, as well as specific variants applied to crack modeling, have limitations when it comes to simulating multi-cracking problems due to material, geometric, and contact nonlinearities. The very nature of a crack – a discontinuity – is in opposition to the framework of Continuum Mechanics. On the other hand, the Discrete Element Method distinguishes itself by its ability to effectively handle discontinuities. It is used to model granular or brittle cohesive materials. However, this approach also has limitations, especially regarding the consideration of material nonlinearities and computation times, which may require significant computing resources to simulate complex problems.The objective of this thesis work was to develop a dynamic remeshing method that allowed transitioning between the two methods to leverage the advantages of both approaches. This objective was be achieved in three steps.Firstly, a non-overlapping coupling method based on the Lagrange multiplier method was developed. This method aimed at ensuring the compatibility of velocities between the discrete elements and finite elements subdomains to facilitate the communication of physical quantities between the two subdomains.Secondly, it was necessary to ensure the continuity of physical quantities within the same zone during its remeshing. This step was achieved by using polynomial interpolation of displacements. This approach allowed determining the fields within the discrete elements when the transition between a finite element subdomain and a discrete element subdomain took place. Test cases were set up to validate these two approaches.Finally, a method was developed to automate the management of coupling and field transfer operations. This approach involved the use of a remeshing technique that automatically generated discrete subdomains from the geometry of the entire finite elements to be replaced.The dynamic remeshing method implemented in this thesis work was applied to a Kalthoff test case and validated by comparing the crack propagation angle with experiments from the literature
Herr, Nathalie. "Contribution à l'ordonnancement post-pronostic de plateformes hétérogènes et distribuées : approches discrète et continue." Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2049/document.
This thesis addresses the problem of maximizing the production horizon of a heterogeneous distributed platform composed of parallel machines and which has to provide a global production service. Each machine is supposed to be able to provide several throughputs corresponding to different operating conditions. It is assumed that using a machine with degraded performances compared to nominal ones allows to extend its useful life before maintenance. The study falls within the decisional step of PHM (Prognostics and Health Management), in which a prognostics phase allows to determine remaining useful lives of machines. The optimization problem consists in determining the set of machines to use at each time and a running profile for each of them so as to maximize the production horizon before maintenance. Machines running profiles are defined on the basis of two models. First one depicts the behavior of machines used with a discrete number of performances. For this case, the problem complexity is first studied considering many variants of the optimization problem. Several optimal and sub-optimal resolution methods are proposed to deal with the scheduling problem. Several sub-optimal resolution methods are then proposed for the second model, which applies to machines whose throughput rate can vary continuously between two bounds. These research works allow to determine the time before failure of a system on the basis of its components remaining useful lives
Частини книг з теми "Homogénéisation continue ou discrète":
HUCKERT, Audrey, and Francis TANO. "Les modèles numériques spécifiques au renforcement." In Les géosynthétiques d’hier à aujourd’hui, 85–115. ISTE Group, 2024. http://dx.doi.org/10.51926/iste.8175.ch3.