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(160) Production(s) de DUBOIS F.
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Numerical simulation of tribological devices used as a set of benchmarks for comparing contact algorithms 
Auteur(s): Chabrand Patrick, Dubois F., Graillet Denis, Boman Romain, Ponthot Jean-Philippe
(Article) Publié:
Finite Elements In Analysis And Design, vol. 41 p.637-665 (2005)
Ref HAL: hal-00580806_v1
DOI: 10.1016/j.finel.2004.08.001
Exporter : BibTex | endNote
3 citations
Résumé: The aim of the present study was to carry out a numerical comparison of different frictional contact algorithms. Therefore three different contact algorithms (Lemke, penalty and Augmented Lagrangian) have been implemented into two finite element codes. The correct implementation and behavior of these contact algorithms has been investigated by modeling four different tribological devices. It is shown that all these different methodologies lead to extremely similar results. Besides these four applications have been carefully described and detailed in such a way that the presented tests can be reproduced. The authors wish that they could serve as a benchmark set in order to allow comparison with other finite element software including frictional contact capabilities.
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Numerical simulation of 2D steady granular flows in rotating drum: On surface flows rheology
Auteur(s): Renouf M., Bonamy Daniel, Dubois F., Alart P.
(Article) Publié:
Physics Of Fluids, vol. 17 p.103303 (2005)
Ref HAL: hal-00005748_v1
Ref Arxiv: cond-mat/0506796
DOI: 10.1063/1.2063347
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
33 citations
Résumé: The rheology of 2D steady surface flow of cohesionless cylinders in a rotating drum is investigated through {\em Non Smooth Contact Dynamics} simulations. Profile of volume fraction, translational and angular velocity, rms velocity, strain rate and stress tensor were measured at the midpoint along the length of the surface flowing layer where the flow is generally considered as steady and homogeneous. Analysis of these data and their inter-relations suggest the local inertial number - defined as the ratio between local inertial forces and local confinement forces - to be the relevant dimensionless parameter to describe the transition from the quasi-static part of the packing to the flowing part at the surface of the heap. Variations of the components of the stress tensor as well as the ones of rms velocity as a function of the inertial number are analysed within both the quasi-static and the flowing phases. Their implications are discussed.
Commentaires: 13 pages, 14 figures, 61 references, submitted to Phys. Fluids
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Modélisation discrète de structures maçonnées tridimensionnelles. Prise en compte de demandes industrielles
Auteur(s): Perales R., Vinches M., Dubois F., Bohatier C.
Conference: Colloque Lagrange (LMGC Montpellier, FR, 2005)
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NSCD discrete element method for modeling mansonry structures with a mixed rigid/deformable approach
Auteur(s): Chetouane B., Bohatier C., Vinches Marc, Dubois F.
Conference: ECCOMAS 2004 - European Congress on Computational Methods in Applied Sciences and Engineering (Jyvaskyla, FI, 2004-07-24)
Actes de conférence: , vol. p. (2004)
Ref HAL: hal-03260522_v1
Exporter : BibTex | endNote
Résumé: In our paper we use a discrete method based on the works of J.J. Moreau and M. Jean. This method is called Non Smooth Contact Dynamics. To study a structure with NSCD method usually we have two types of behaviours: • Either we consider all blocks as rigid bodies. This approach allows us to get a macroscopic information about the behaviour of the structure. • Or the lack of information about the internal block behaviour leads us to improve the calculation using deformable blocks. In an entirely deformable approach, the computation takes a very long time. In order to decrease computation time and to reach a higher accuracy than in the rigid case, we will adopt a mixed approach. At first, we will treat our structure as a collection of rigid blocks. If an indicator of macroscopic stress indicates a critical level of loading, we replace this rigid body by a deformable one. The advantage of this mixed approach is to save computation time and to get accurate local information in the more loaded part of the structure. A presentation of this approach will be done through a typical case.
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A parallel version of the non smooth contact dynamics algorithm applied to the simulation of granular media
Auteur(s): Renouf M., Dubois F., Alart P.
Conference: 2nd International Conference on Advanced Computational Methods in Engineering (Liege (BELGIUM), , 2002-05-27)
Actes de conférence: JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS, vol. 168 p.375-382 (2004)
Résumé: The NSCD method has shown its efficiency in the simulation of granular media. Since the number of particles and contact increases, the shape of the discrete elements becomes more complicated and the simulated problems becomes more complex, the numerical tools need to be improved in order to preserve reasonable elapsed CPU time. In this paper we present a parallelization approach of the NSCD algorithm and we investigate its influence on the numerical behaviour of the method. We illustrate the efficiency on an example made of hard disks: a free surface compaction. (C) 2003 Published by Elsevier B.V.
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Basics on numerical algorithms for Non Smooth Dynamical Systems
Auteur(s): Acary Vincent, Dubois F.
Conférence invité: Third SICONOS General Meeting (Bristol, GB, 2004-09-15)
Actes de conférence: , vol. 1 p.32 - 32 (2004)
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Study and simulation of fragmentation phenomena of concrete structures under stuffy explosion
Auteur(s): Roméro H., Jourdan F., Dubois F.
Conférence invité: International Conference on Computational and Experimental Engineering and Sciences (, FR, 2004)
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