Publications

2001

• On the behaviour characterisation of polymeric foams over a large range of strain rates
  
  • Zhao Han
  • Gary Gérard
  , 2001, pp.23-28. The testing and modelling of the mechanical behaviour of some polymeric foams involved in the automotive industry are presented. A variety of current experimental arrangements over a large range of strain rates have been reviewed. Recent improvements of a particularly useful technique for impact loading–the split Hopkinson bar–are presented. A phenomenological model is developed to describe experimental data. Difficulties for 3-dimensional testing and modelling are also discussed.
• Effet de la fréquence et de l'environnement sur la propagation des fissures de fatigue en mode II dans un acier maraging
  
  • Doquet V.
  , 2001. No abstract provided
• Application du principe du maximum de vraisemblance à la séparation des ondes dans les barres
  
  • Othman Ramzi
  • Bussac Marie-Noëlle
  • Collet Pierre
  • Gary Gérard
  , 2001.
• Etude de systèmes avec surfaces de discontinuités mobiles sous chargement thermomécanique
  
  • Peigney Michaël
  • Stolz C.
  , 2001. No abstract provided
• Fatigue Analysis during One-parametered Loadings
  
  • Zarka Joseph
  • Karaouni Habib
  , 2001.
• Action d'une conduite circulaire sur un sol cohérent
  
  • Salençon Jean
  , 2001, 2001-08-31, pp.1311-1314. On s'intéresse à la détermination théorique de la capacité portante d'un sol homogène, isotrope, purement cohérent sur lequel repose une conduite circulaire. Les deux conditions extrêmes de contact à l'interface entre la conduite et le sol (interface lisse sans résistance à la traction et interface totalement adhérente) sont envisagées ce qui permet d'encadrer la solution du problème réel. On a appliqué les méthodes d'approche par l'intérieur statique et d'approche par l'extérieur cinématique de la théorie du calcul à la rupture pour une analyse paramétrique en fonction de la profondeur d'enfoncement de la conduite. Les évaluations par défaut et par excès ainsi obtenues montrent que l'effet de la gravité est purement additif, égal à la simple «poussée d'Archimède» exercée par le sol et améliorent, dans le cas de l'interface lisse, les résultats antérieurs de Mur1l: Wagner & Randolph.
• Un outil de la mécanique des matériaux : la micro-extensométrie
  
  • Bretheau Thierry
  • Crépin Jérôme
  • Doumalin Pascal
  • Bornert Michel
  , 2001.
• 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.
• 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
• Estimations affine et au second ordre du comportement non linéaire des composites et polycristaux
  
  • Bornert Michel
  , 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
• 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.
• 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
• Calcul tensoriel et élasticité
  
  • Bornert Michel
  • Suquet Pierre
  , 2001, pp.171-202.
• 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
• 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
• Une méthode de calcul de structures soumises à des chargements mobiles
  
  • Nguyen-Tajan Thi Mac-Lan
  • Maitournam Habibou
  • Thomas Jean-Jacques
  , 2001, 11 (2-4), pp.351-358. Le travail présenté dans cet article s'inscrit dans une étude globale de la tenue en service d'un disque de frein automobile. Celui-ci subit des chargements thermomécaniques responsables de divers types d'endommagement : faïençage, fissures radiales sur les pistes de frottement, rupture du bol. La prédiction numérique de ces avaries exige d'abord la mise au point de méthodes numériques adaptées aux problèmes de structures soumises à des chargements thermomécaniques mobiles. Celles-ci consistent en des algorithmes eulériens qui sont présentés et décrits. (10.3166/reef.11.247-261)
  DOI : 10.3166/reef.11.247-261
• 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
• 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
• Infrared observation of the mechanical performance of tennis strings
  
  • Luong M. P.
  , 2001, pp.624-635. No abstract provided
• Wear modelling of contact plan/plan between graphite and titanium alloy
  
  • Serre Ingrid
  • Bonnet Marc
  • Celati N.
  • Duval Rachel-Marie Pradeilles
  , 2001, pp.287-293.
• Increasing the maximum strain measured with elastic and viscoelastic bars
  
  • Ohtman Ramzi
  • Bussac Marie-Noëlle
  • Collet Pierre
  • Gary Gérard
  , 2001, pp.49-56. A new method has been developed for separating dispersive waves in elastic and viscoelastic rods from multi-point strain and velocity measurements. Knowing then the basic waves, the stress, the strain, the displacement and the particle velocity can be calculated at any point of the bar. The method is based on the assumption of one dimensional and single mode dispersive wave propagation and it takes account of the wave dispersion. It is shown that the method is stable with respect to noise, so that the measuring time is increased considerably. Subsequently, the maximum strain which can be measured in a material tested with a classical SHPB (Split Hopkinson Pressure Bar) set-up is also increased and is no longer limited by the length of the bars. The method is illustrated here by applying it successfully to the analysis of a real test of aluminum honeycomb. It can also be applied to other kinds of one-dimensional and single-mode dispersive waves such as flexural waves in beams and acoustic waves in wave-guides.