Publications

2001

• Infrastructure and Conservation Applications of Infrared and Thermal Testing
  
  • Luong Minh-Phong
  , 2001, 3, pp.613-655.
• Strain localization in two-phase materials and polycrystals: Quantitative experimental investigations and modeling attempts
  
  • Bornert Michel
  • Doumalin Pascal
  • Crépin Jérôme
  • Soppa Ewa
  , 2001.
• Handbook of Continuum Mechanics
  
  • Salençon Jean
  , 2001. The scale that concerns the practitioner in mechanics is usually qualified as macroscopic. Indeed, applications are rarely much below the human scale, and in order to be relevant models must be constructed on a similar scale, several orders of magnitude greater than the objects that are normally attributed to the physicist's sphere of interest. The mechanicist is therefore aware of the limits of these models, no matter how elegant their mathematical formulation may be, when the time comes far experimental validation. The mechanicist has a deep concern for the microscopic phenomena at the heart of what is being modelled, exposed by the physicist's research, which can today explain a wide range of material behaviour. The aim of this book is to present the general ideas behind continuum mechanics, thermoelasticity and one-dimensional media. Our approach to constructing mechanical models and modelling forces is based upon the principle oi virtual work. There are several advantages to this method. To begin with, it clearly emphasises the key role played by geometrical modelling, leading to mechanically consistent presentations in a systematic way. In addition, by requiring rigorous thought and clear formulation of hypotheses, it identifies the inductive steps and emphasises the need for validation, despite its axiomatic appearance. Moreover, once mastered, it will serve as a productive tool in the reader's later research career. This duality is used in the chapter devoted to variational methods for the solution of thermoelastic problems. (10.1007/978-3-642-56542-7)
  DOI : 10.1007/978-3-642-56542-7
• Estimations affine et au second ordre du comportement non linéaire des composites et polycristaux
  
  • Bornert Michel
  , 2001.
• Avoiding the bloat with stochastic grammar-guided genetic programming
  
  • Ratle Alain
  • Sebag Michèle
  , 2002, pp.255-266. The application of Genetic Programming to the discovery of empirical laws is often impaired by the huge size of the search space, and consequently by the computer resources needed. In many cases, the extreme demand for memory and CPU is due to the massive growth of non-coding segments, the introns. The paper presents a new program evolution framework which combines distribution-based evolution in the PBIL spirit, with grammar-based genetic programming; the information is stored as a probability distribution on the grammar rules, rather than in a population. Experiments on a real-world like problem show that this approach gives a practical solution to the problem of introns growth. (10.1007/3-540-46033-0_21)
  DOI : 10.1007/3-540-46033-0_21
• Modelling the Electromagnetic Forces Distribution in a Three Dimensional G.M.A.W. Weld Pool
  
  • Roger F.
  • Coiffier J. C.
  • Dang Van K.
  , 2001. No abstract provided
• Non-destructive evaluation of a limit of acceptable damage for leather products
  
  • Luong Minh-Phong
  , 2001, pp.358-367.
• Thermomechanical approach of contact-wear phenomena
  
  • Stolz Claude
  , 2001, pp.183-186.
• Cinétique de fissuration de revêtements sur un substrat ductile : application à des dépôts de tungstène PVD déposés sur un acier
  
  • Ganne T.
  • Crépin Jérôme
  • Zaoui A.
  • Serror S.
  , 2001. No abstract provided
• Grammar-guided genetic programming and dimensional consistency: application to non-parametric identification in mechanics
  
  • Ratle Alain
  • Sebag Michèle
  Applied Soft Computing, Elsevier, 2001, 1 (1), pp.105-118. Although genetic programming has often successfully been applied to non-parametric modeling, it is frequently impaired by the huge size of the search space explored. Domain knowledge is a powerful way to trim out the size of the space, by restricting the search to a priori relevant models. A most natural domain knowledge in scientific modeling is known as dimensional analysis, stipulating that the models must be consistent with regards to the variable measurement units. In this paper, it is shown that dimensional analysis can automatically be expressed as a context free grammar. Dimensionally-aware GP is thus achieved by employing the dimensional grammar within the grammar-guided GP framework first investigated by Gruau [On using syntactic constraints with genetic programming, in: P. Angeline, K.E. Kinnear Jr. (Eds.), Advances in Genetic Programming II, MIT Press, Cambridge, MA, 1996, pp. 377–394.]. However, grammar-guided genetic programming encounters severe difficulties when it involves a complex grammar, which might explain why this approach has not been widely used so far. The drawback is blamed on the initialization step, which hardly constructs a sufficiently diversified initial population, thus hindering the success of evolution. This limitation is addressed by a new CFG compliant initialization procedure. The approach is validated on two problems related to the identification of mechanical properties of materials. (10.1016/S1568-4946(01)00009-6)
  DOI : 10.1016/S1568-4946(01)00009-6
• Applying the virtual fields method to determine the through-thickness moduli of thick composites with a nonlinear shear response
  
  • Grédiac Michel
  • Auslender François
  • Pierron Fabrice
  Composites Part A: Applied Science and Manufacturing, Elsevier, 2001, 32, pp.1713-1725. This paper presents a method allowing the simultaneous identification of parameters governing an orthotropic law with a nonlinear shear response. Such laws appear for instance through the thickness of thick laminated composites. The tested specimen is subjected to boundary conditions similar to those of a Iosipescu setup. The strain field in the central area is processed with the so-called virtual fields method, which is an application of the principle of virtual work with particular virtual fields. The method is simulated with data obtained from finite element calculations. (10.1016/S1359-835X(01)00029-X)
  DOI : 10.1016/S1359-835X(01)00029-X
• Une formulation symétrique pour le couplage entre éléments finis et éléments de frontière
  
  • Mouhoubi Saïda
  • Bonnet Marc
  • Ulmet Laurent
  , 2001, 11 (2-4), pp.627-634. Cet article présente une procédure, basée sur les équations intégrales variationnelles symétriques régularisées en élasticité tridimensionnelle, permettant de construire la matrice de rigidité d'un super-élément. Celle-ci ne porte que sur les déplacements nodaux à la frontière du domaine définissant le super-élément, supposé élastique et sans force de volume. Cette technique a été implantée dans l'environnement CAST3M, y compris dans le cas où le domaine élastique contient une fissure. Trois exemples numériques tridimensionnels sont présentés: cavité sphérique pressurisée en milieu infini élastoplastique, assemblage, cylindre avec fissure. (10.3166/reef.11.277-289)
  DOI : 10.3166/reef.11.277-289
• An example of stick-slip waves
  
  • Moirot Franck
  • Nguyen Quoc-Son
  , 2001, pp.109-116. An analytical solution representing a family of stick–slip waves is obtained in a simple example modelling the dynamic behaviour of an elastic cylindrical tube in contact with Coulomb's friction with a rigid and rotating cylinder. This family of waves, representing the non-trivial periodic responses of a continuous system of one space variable, is not classical in the literature. (10.1007/978-94-017-1154-8_12)
  DOI : 10.1007/978-94-017-1154-8_12
• On shakedown theorems in hardening plasticity
  
  • Nguyen Quoc Son
  • Pham Duc Chinh
  Comptes rendus de l’Académie des sciences. Série IIb, Mécanique, Elsevier, 2001, 329, pp.307-314. The model of generalized standard materials gives a convenient framework to extend Koiter's shakedown theorems into hardening plasticity. The extension of the static shakedown theorem (Melan–Koiter's theorem), proposed previously in [5], is considered here. It leads to the definition of safety coefficients in hardening plasticity by duality. Static and kinematic approaches are discussed for the models of isotropic hardening, of linear kinematic hardening (Ziegler–Prager's model) and of limited kinematic hardening. This discussion also leads to an extension of Koiter's kinematic shakedown theorem and to a second kinematic coefficient. (10.1016/S1620-7742(01)01321-6)
  DOI : 10.1016/S1620-7742(01)01321-6
• Experimental and numerical characterisation of in plane deformation in two-phase materials
  
  • Soppa Ewa Anna
  • Doumalin Pascal
  • Binkele Peter
  • Wiesendanger Tobias
  • Bornert Michel
  • Schmauder Siegfried
  Computational Materials Science, Elsevier, 2001, 21 (3), pp.261-275. The aim of the present work consists in the comparison of in-plane strain fields with out-of-plane displacements in micro-areas of an Ag/Ni-composite after a macroscopic compressive deformation of 8.6%. The in-plane deformations in an Ag/Ni-composite have been analysed experimentally with a high resolution object grating technique and numerically using the finite element method. The out-of-plane displacements were measured with an atomic force microscope (AFM). The development of local strain fields in micro-areas at the surface of an Ag/Ni-composite was simulated numerically using the FE-method in plane strain condition. A real cut-out of the microstructure served as input for the calculation. The out-of-plane displacements determined by AFM measurements were used further to correct the in-plane values of strains evaluated by the object grating technique. The roughness on the surface of the sample was characterised by fractal dimensions and compared with the in-plane strains in the same micro-region. (10.1016/S0927-0256(01)00170-7)
  DOI : 10.1016/S0927-0256(01)00170-7
• Modal analysis of a complete clarinet
  
  • Facchinetti Matteo Luca
  • Boutillon Xavier
  • Constantinescu Andrei
  , 2001. A modal computation of a complete clarinet is presented by the association of finite-element models of the reed and of part of the pipe, and a lumped-element model of the rest of the pipe. This is a continuation of an initial work by Pinard and Laine (unpublished reports of the Ecole Polytechnique) on isolated reeds. The eigenmodes of the complete system are computed and the results lead to a discussion of the following points: flexion and torsion modes of the reed, their coupling to the acoustical field, plane wave hypothesis, equivalent volume approximation in the mouthpiece, and alignment of resonance peaks.
• Increasing the maximum strain measured with the elastic and viscoelastic Hopkinson bars
  
  • Othman Ramzi
  • Bussac Marie-Noëlle
  • Collet Pierre
  • Gary Gérard
  , 2001.
• Tomographie aux rayons X de l'écoulement du sucre en poudre ensilé
  
  • Luong M. P.
  , 2001. No abstract provided
• Moving discontinuities: applications to fracture and wear
  
  • Stolz Claude
  , 2001.
• Caractérisation de l'écrouissage dans des monocristaux de Zirconium
  
  • Lecomte J. S.
  • Crépin Jérôme
  • Philippe Marie-Jeanne
  , 2001.
• Modification du critère de Gurson par une approche micromécanique
  
  • Bilger Nicolas
  • Auslender François
  • Bornert Michel
  • Masson Renaud
  • Zaoui André
  , 2001.
• Matériaux du nucléaire
  
  • Zaoui A.
  , 2001.
• Some recent advances in symmetric Galerkin boundary element methods and their coupling with finite elements
  
  • Bonnet Marc
  , 2001.
• Evolution de la pression dans une caverne remplie de fluide
  
  • Bérest P.
  • Brouard B.
  • Bergues J.
  • Durup G.
  , 2001, pp.96. No abstract provided
• Un exemple d'onde stick-slip
  
  • Moirot F.
  • Nguyen Q. S.
  , 2001, pp.229-236. No abstract provided