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Дисертації з теми "Elément fini volumique":
Ghomari, Tewfik. "Contribution à la modélisation 3D volumique de la mise en forme des corps plastiques creux." Reims, 2007. http://www.theses.fr/2007REIMS001.
The principal objective of this thesis is to develop a software of working of the plastic bodies hollow 3D axisymmetric, with a precise distribution of the thicknesses and a cost of less low calculation. That became possible with the development of a new finite element of axisymmetric solid (baptized SFRQ-Axi) based on the kinematic concept of rotation of a space fiber (Space Fiber Rotation concept). The developed finite element has the advantage of converging quickly for the problems with contact presenting of the flexing areas. The choice of the algorithm of search for contact plays also a part in the fast treatment of the management of the nodes candidates to the contact. A simple algorithm of research local is worked out to test the penetration of the segments “masters” by the “Slavic” nodes. Encountered numerical difficulties to which we had faced, and who are due to the strong not geometrical linearities, material and especially with nonthe linearities of contact. Let us underline also the difficulty in managing the incompressibility of the voluminal or axisymmetric finite elements 3D. Two approaches of implicit calculation and clarifies are treated for an example of feeding-bottle. The results obtained shows the good precision of implicit calculation compared to explicit calculation. The tests of validation of the SFRQ-Axi element with contact on a test of inflection of a circular plate, being rolled up on a rigid torus, shows the good speed of convergence and a better precision of the results thicknesses. The results of the tests of working give also a good distribution thicknesses inside the beach given by the experimental results
Wei, Guoqiang. "Towards overall adaptive modeling based on solid-shell and solid-beam approaches for the static and dynamic finite element analysis of structures." Thesis, Compiègne, 2021. https://bibliotheque.utc.fr/Default/doc/SYRACUSE/2021COMP2618.
The finite element method has been widely used since the 1970s to predict the behavior of structures such as automobiles, airplanes, machines, bridges or buildings. The modeling choices are essential to build a representative model and control the number of degrees of freedom. Many works have sought to optimize the model from a mesh point of view, namely by proposing adaptive meshing techniques. On the other hand, concerning the theory choice, seldom work has been carried out to obtain an optimal finite element model. In the context of static and vibratory linear analysis, this thesis aims to propose an adaptive modeling methodology in order to obtain an optimal finite element model from the theory choice point of view. The mesh, composed only of solid elements, is refined at each iteration of the methodology. An appropriate choice between beam, shell and 3D elasticity theories is made on each finite element of the model at each analysis. In areas where beam or shell theories are relevant, specific displacement fields are applied. New solid-shell and solid-beam approaches, based respectively on shell theory and beam theory, have been developed for this purpose. For each of these two approaches, first-order and higher-order theories are proposed. In these areas, the application of kinematic relations at nodes of the solid mesh, by using linear equations, leads to a reduction of the number of degrees of freedom. In the context of static and vibratory analysis, several examples are treated to evaluate the methodology of adaptive modeling. The numerical results obtained are always very close to those of a reference solid model and the adaptive modeling method leads to a significant reduction in the model size
Domissy, Edwige. "Formulation et évaluation d'éléments finis volumiques modifiés pour l'analyse linéaire et non linéaire des coques." Compiègne, 1997. http://www.theses.fr/1997COMP1013.
Dubois, André. "Essai de compression-translation : Contribution à l'identification des lois de comportement surfaciques et volumiques." Valenciennes, 1995. https://ged.uphf.fr/nuxeo/site/esupversions/b97e143c-6fb6-44cc-83c8-e34fc7845c1e.
Riccardi, Francesco. "Experimental and numerical investigation of the interaction between concrete and FRP reinforcement anchorages." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST065.
Strengthening and retrofitting techniques are often required for guaranteeing the integrity of Reinforced Concrete (RC) structures to prevent seismic risk. In such a framework, Externally Bonded (EB) FRP strengthening systems have proven their effectiveness in enhancing the flexural performances of structural members both in terms of bearing capacity and ductility. In order to improve the bond in the vicinity of RC joints, embedded anchors represent an attractive solution in terms of both performances and ease of installation. Nevertheless, their mechanical behaviour is often associated with localised deformation mechanisms that can strongly affect the overall structural response. A novel experimental apparatus has therefore been designed in order to carry out in-situ bending tests on small-scale strengthened beams in conjunction with 3D tomography and study the interaction between concrete and anchors. The main goal is to track the evolution of material degradation over the entire loading history by means of Digital Volume Correlation (DVC) and to reconstruct the kinematics of the strengthened region. From a numerical point of view, an enriched finite element model inspired by the Strong Discontinuity Approach (SDA) has been developed with the aim of improving the interface representation. By means of a kinematic enrichment, this strategy allows, on the one hand, to account for complex mechanical behaviours such as pull-out deformation modes and debonding mechanisms, on the other hand, to limit the computational effort. The calibration of the interfacial behaviour is then realised by means of the in-situ experimental results which allow to validate the model in the case of non-linear problems
Moreau, Aurélien. "Identification de propriétés viscoélastiques de matériaux polymères par mesures de champs de réponses en fréquence de structures." Phd thesis, INSA de Rouen, 2007. http://tel.archives-ouvertes.fr/tel-00685890.