Publications

2001

• Un outil de la mécanique des matériaux : la micro-extensométrie
  
  • Bretheau Thierry
  • Crépin Jérôme
  • Doumalin Pascal
  • Bornert Michel
  , 2001.
• 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.
• Techniques of Infrared Thermography
  
  • Luong M. P.
  , 2001, pp.342-357.
• Séparation et reconstruction des ondes dans les barres élastiques et viscoélastiques à partir de mesures redondantes
  
  • Othman Ramzi
  • Bussac Marie-Noëlle
  • Collet Pierre
  • Gary Gérard
  Comptes Rendus. Mécanique, Académie des sciences (Paris), 2001, 329 (5), pp.369 - 376. La durée du chargement habituellement utilisée avec le système des barres de Hopkinson (ou SHPB pour Split Hopkinson Pressure Bar) est limitée par la nécessité de séparer les ondes se propageant dans des sens opposés. En utilisant le principe du maximum de vraisemblance, et à partir de N mesures de déformation et P mesures de vitesse matérielle (N+P⩾2), nous construisons une nouvelle méthode de séparation des ondes dans les barres. Cette méthode permet de calculer, sans limitation de durée, les contraintes, les déformations, les déplacements et les vitesses matérielles en tout point de la barre. Elle tient compte des effets dispersifs aussi bien dans les barres élastiques que dans les barres viscoélastiques. Elle est illustrée sur une barre libre pour laquelle le déplacement mesuré est 30 fois supérieur à celui qui serait atteint par la méthode classique. (10.1016/S1620-7742(01)01343-5)
  DOI : 10.1016/S1620-7742(01)01343-5
• Life-time prediction of aluminum automotive components under thermo-mechanical cyclic loadings
  
  • Verger Laetitia
  • Charkaluk Eric
  • Constantinescu Andrei
  , 2001.
• Identification of elastoviscoplastic materials: a discussion about uniqueness
  
  • Constantinescu Andrei
  , 2001.
• Modelling rate-dependent effects in heterogeneous materials
  
  • Masson Renaud
  • Zaoui André
  , 2001.
• Influence of the test frequency and environment on mode II fatigue crack growth in a maraging steel
  
  • Doquet Véronique
  , 2001.
• Identification of constitutive parameters in engineering problems
  
  • Constantinescu Andrei
  • Lecampion Brice
  • Verger Laetitia
  • Tardieu Nicolas
  , 2001.
• 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.
• Nondestructive evaluation of rock material instability
  
  • Luong M. P.
  , 2001, pp.463-466. No abstract provided
• 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.
• Infrared observation of the mechanical performance of tennis strings
  
  • Luong M. P.
  , 2001, pp.624-635. No abstract provided
• Comportement mécanique non linéaire et homogénéisation
  
  • Bornert Michel
  , 2001.
• Fatigue Analysis of Welded Structures during Random Loadings
  
  • Zarka Joseph
  • Karaouni Habib
  , 2001.
• A Salt-cavern abandonment test
  
  • Bérest Pierre
  • Bergues Jean
  • Brouard Benoît
  • Durup Gerard
  • Guerber Benoît
  International Journal of Rock Mechanics and Mining Sciences, Pergamon and Elsevier, 2001, 38 (3), pp.357-368. Thousands of caverns have been leached out from deep salt formations. They are used for saturated brine production and/or hydrocarbons storage. They will be abandoned some day: the access well will be plugged with cement, isolating a large bubble of saturated brine. The later evolution of such a bubble raises serious concerns for environmental protection; salt creep and brine thermal expansion can lead to brine pressure build-up and rock-mass fracture, then brine seepage can lead to pollution of overlying water-bearing strata. Taking into account salt formation permeability leads to less pessimistic scenarios. An 18-month test has been performed on a deep brine-filled cavern. The objective was to measure the brine equilibrium pressure reached when the cavern is closed. Such an equilibrium is reached when salt mass creep, which leads to cavern shrinkage, balances brine permeation through the cavern wall. This objective was met by imposing different pressure levels and observing whether the pressure increased (or decreased) with respect to time. Data misinterpretation (i.e., a well leak instead of a cavern-proper leak) was precluded by a special monitoring system. The observed equilibrium pressure was significantly smaller than geostatic pressure, alleviating any fracture risk for a sealed and abandoned cavern in this salt formation. (10.1016/S1365-1609(01)00004-1)
  DOI : 10.1016/S1365-1609(01)00004-1
• Homogénéisation des milieux aléatoires : bornes et estimations
  
  • Bornert Michel
  • Bretheau Thierry
  • Gilormini Pierre
  , 2001, pp.133-222.
• Stability of a quasi-static evolution of a visco-elastic, visco-plastic or elastic-plastic solid
  
  • Abed-Meraim Farid
  • Nguyen Quoc Son
  , 2001, pp.1-14. The problem of stability of a quasi-static evolution of a solid is discussed in the framework of standard plasticity and visco-plasticity. General results concerning the criterion of second variation of energy are presented. Two different approaches are considered to discuss this problem for visco-elastic, visco-plastic or elastic-plastic solids. The first approach is based upon the linearization method and gives the asymptotic stability of the evolution of a visco-elastic solid when the associated dissipation potential is quadratic and positive-definite. The second approach introduces a direct analysis of the evolution in a nonsmooth but convex framework of plasticity and visco-plasticity. (10.1007/978-1-4613-0275-9_1)
  DOI : 10.1007/978-1-4613-0275-9_1
• Approche par contrôle optimal des structures élastoviscoplastiques sous chargement cyclique
  
  • Peigney Michaël
  • Stolz Claude
  Comptes Rendus de l'Academie des Sciences Serie II, Gauthier-Villars, 2001, 329, pp.643-648. On utilise l'approche par contrôle optimal pour étudier le comportement de structures élastoplastiques sous chargement cyclique. L'état asymptotique est ainsi obtenu comme solution d'un problème approché cohérent avec une discrétisation spatiale. Dans ce cadre, on montre que les seuls points stationnaires de la fonctionnelle à minimiser sont les minima globaux. (10.1016/S1620-7742(01)01381-2)
  DOI : 10.1016/S1620-7742(01)01381-2
• 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
• 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
• 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
• 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.
• Calcul tensoriel et élasticité
  
  • Bornert Michel
  • Suquet Pierre
  , 2001, pp.171-202.