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(160) Production(s) de DUBOIS F.



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Modeling of frictional surface contact in discrete element structure
Auteur(s): Bohatier C., Vinches M., Perales R., Dubois F.
Conférence invité: ICCE-14 (Boulder, Colorado, USA, FR, 2006)
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Modélisation par éléments discrets d'ouvrage en génie civil. La méthode Non Smooth Contact Dynamics
Auteur(s): Perales R., Vinches M., Dubois F., Bohatier C.
Conférence invité: 24ème Rencontres Universitaires de Génie Civil "Construire : les nouveaux défis" (La Grande Motte, FR, 2006)
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Realistic Haptic Rendering of Interacting Deformable Objects in Virtual Environments 
Auteur(s): Duriez Christian, Dubois F., Kheddar Abderrahmane, Andriot Claude
(Article) Publié:
Ieee Transactions On Visualization And Computer Graphics, vol. 12 p.36-47 (2006)
Ref HAL: hal-00269404_v1
Ref Arxiv: 0804.0561
DOI: 10.1109/TVCG.2006.13
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
110 citations
Résumé: A new computer haptics algorithm to be used in general interactive manipulations of deformable virtual objects is presented. In multimodal interactive simulations, haptic feedback computation often comes from contact forces. Subsequently, the fidelity of haptic rendering depends significantly on contact space modeling. Contact and friction laws between deformable models are often simplified in up to date methods. They do not allow a "realistic" rendering of the subtleties of contact space physical phenomena (such as slip and stick effects due to friction or mechanical coupling between contacts). In this paper, we use Signorini's contact law and Coulomb's friction law as a computer haptics basis. Real-time performance is made possible thanks to a linearization of the behavior in the contact space, formulated as the so-called Delassus operator, and iteratively solved by a Gauss-Seidel type algorithm. Dynamic deformation uses corotational global formulation to obtain the Delassus operator in which the mass and stiffness ratio are dissociated from the simulation time step. This last point is crucial to keep stable haptic feedback. This global approach has been packaged, implemented, and tested. Stable and realistic 6D haptic feedback is demonstrated through a clipping task experiment.
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Numerical investigations of fault propagation and forced-fold using a non smooth discrete element method 
Auteur(s): Renouf M., Dubois F., Alart P.
(Article) Publié:
European Journal Of Computational Mechanics, vol. 15 p.549-570 (2006)
Ref HAL: hal-00447273_v1
DOI: 10.3166/remn.15.549-570
Exporter : BibTex | endNote
3 citations
Résumé: Les problèmes géophysiques tels que l’évolution des plis et la propagation de failles induisent de grandes déformations et de nombreuses localisations. Il apparaît donc difficile de décrire le problème avec les outils de la mécanique des milieux continus, et il est donc preferable de représenter la structure comme initialement divisée. Ces deux phénomènes sont étudiés via une approche non régulière par éléments discrets. Les structures géologiques sont considérées comme des collections de particules dont les interactions répondent à des lois de contact cohésif frottant. Les observations des structures géophysiques numériques sont corrélées aux propriétés des structures au travers d’une analyse mécanique.
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