Publications

2001

• In-situ salt permeability testing
  
  • Brouard B.
  • Bérest P.
  • Durup G.
  , 2001, pp.139-157. No abstract provided
• On the identification of elastoviscoplastic constitutive laws from indentation tests
  
  • Constantinescu Andreï
  • Tardieu Nicolas
  Inverse Problems in Engineering, Informa UK (Taylor & Francis), 2001, 9, pp.19-44. This paper addresses the identification of the parameters of a nonlinear constitutive law from indentation tests. The identification problem is considered as a constrained minimization problem and the gradient is computed using the adjoint state method, in spite of the difficulties of the underlying contact problem. This provides a general framework to perform optimization in some problems involving contact conditions and nonlinear material behaviour. The case of a Maxwell viscoelastic and a Norton-Hoff elastoviscoplastic constitutive law are treated extensively and a series of numerical identification examples are shown. (10.1080/174159701088027751)
  DOI : 10.1080/174159701088027751
• Assessment of Welded Structures by a Local Multiaxial Fatigue Approach
  
  • Dang Van Ky
  • Bignonnet André
  • Fayard Jean-Luc
  • Janosch Jean-Jacques
  Fatigue and Fracture of Engineering Materials and Structures, Wiley-Blackwell, 2001, 24 (5), pp.369-376. A new local multiaxial computing method for the fatigue assessment of welded structures is presented. This approach is based on the use of an equivalent stress derived from the multiaxial fatigue criterion proposed by Dang Van for plain machined specimens. Application to fillet welds allows a better description of the influence of local geometries and residual stress states. These factors are related to the weld process and the quality of the weld. This approach, associated with definite shell finite element meshing rules in order to take account of the increase of local rigidity introduced by the weld, is also successfully used to assess the fatigue resistance of welded automotive structures. (10.1046/j.1460-2695.2001.00399.x)
  DOI : 10.1046/j.1460-2695.2001.00399.x
• Modèles simplifiés par programmation génétique : prise en compte du sens physique
  
  • Ratle A.
  • Sebag Michèle
  , 2001, pp.821-828. No abstract provided
• Unified approach for low and high cycle fatigue
  
  • Constantinescu Andrei
  • Dang Van Ky
  • Maitournam Habibou
  , 2001.
• Etude du comportement asymptotique de structures élastoviscoplastiques sous chargement cyclique : utilisation du contrôle optimal
  
  • Peigney Michaël
  • Stolz C.
  , 2001, pp.327-334. No abstract provided
• Homogénéisation en mécanique des matériaux, Tome 2 : Comportements non linéaires et problèmes ouverts
  
  • Bornert Michel
  • Bretheau T.
  • Gilormini P.
  , 2001, pp.250 pages.
• Modelling an abrasive wear experiment by the boundary element method
  
  • Serre I.
  • Bonnet Marc
  • Pradeilles-Duval R. M.
  Comptes Rendus de l'Academie des Sciences Serie II, Gauthier-Villars, 2001, 329, pp.803-808. This Note presents a computational technique for simulating friction-induced wear in a tribology experiment on a plan/plan, ring-on-disc contact configuration. The boundary element method results in modest computing times and facilitates the mesh modifications used for tracking the wear profile evolution. A typical wear simulation result is presented and discussed. (10.1016/S1620-7742(01)01402-7)
  DOI : 10.1016/S1620-7742(01)01402-7
• Back analysis of loading parameters in shallow tunnels
  
  • Deng Desheng
  • Minh Duc Nguyen
  • Constantinescu Andrei
  , 2001 (1), pp.177-183. Convergence Confinement (CV-CF) Method is currently used in geo-engineering practice as a plane strain approximate tunnel calculation, for example, in the scope of a NATM construction procedure. However, although improvements have been recently achieved for some simple cases, this method is impeded by undetermination of the deconfining ratio value λo at the moment when support is laid. A back analysis method has been proposed on the basis of the Virtual Work Principle, in which the original CV-CF model is compared through an iterative process to a modified model in which the field measurements are prescribed. The parameter λo and the lateral stress ratio k0 of soil mass are back analysed. This method is very robust and works also for non linear rock mass behavior. For illustration of this back analysis method, 2D shallow tunnel calculation data are used as experimental data. (10.1201/9781003078562-21)
  DOI : 10.1201/9781003078562-21
• Simulation de l'usure sous frottement : utilisation des éléments de frontière
  
  • Serre I.
  • Bonnet Marc
  • Pradeilles-Duval R. M.
  , 2001, pp.245-252. No abstract provided
• Détermination de cycle limite par une méthode cyclique directe
  
  • Pommier Benjamin
  • Maitournam Habibou
  • Gaombalet Jérôme
  , 2001, pp.335-342.
• Experimental and numerical analysis of localization during sequential test for an IF-Ti steel
  
  • Hoc Thierry
  • Rey Collette
  • Raphanel Jean
  Acta Materialia, Elsevier, 2001, 49, pp.1835-1846. Localization of plastic deformation in polycrystals often occurs after a change of loading path. An experimental study using several techniques at different scales (scanning electron microscopy, microgrids, local orientation measurements, transmission electron microscopy) has been conducted on mild steel sheets (interstitial free titanium steel) prestrained by plane tension and then deformed by uniaxial tension along the first tensile axis or the transverse axis. In this way localization has been linked to microstructural anisotropy developed during the first loading path. A model based on crystalline plasticity has then been introduced in a finite element code (Abaqus) with a description of intragranular hardening linked to the evolution of the dislocation densities on each slip system. The simulations make use of a finite element representative pattern based on actual grain distribution in the aggregate. The computations predict a localization in good agreement with the experimental data and show a link between saturation of dislocation densities and concentration of plastic deformation. (10.1016/S1359-6454(01)00076-3)
  DOI : 10.1016/S1359-6454(01)00076-3
• Background on Fracture Mechanics
  
  • Bui Huy Duong
  • Leblond J.B.
  • Stalin-Muller N.
  , 2001, pp.549-565. (10.1016/B978-012443341-0/50061-2)
  DOI : 10.1016/B978-012443341-0/50061-2
• Formulation et analyse des problèmes d'impacts en mécanique des solides
  
  • Ballard Patrick
  , 2001.
• TiAl à 3 échelles
  
  • Gélébart L.
  • Crépin Jérôme
  • Bornert Michel
  • Bretheau T.
  , 2001. No abstract provided
• Fatigue evaluation of metals using infrared thermography
  
  • Luong M. P.
  , 2001. No abstract provided
• On global approaches to some problems involving plasticity and viscosity effects
  
  • Dang Van K.
  , 2001.
• Application of Symmetric Galerkin boundary integral equations to 3-D symmetric FEM-BEM coupling
  
  • Mouhoubi Saida
  • Bonnet Marc
  • Ulmet L.
  , 2001. No abstract provided
• Influence of the film thickness on residual stresses, crystallographic and mechanical properties of magneton-sputtered tungsten coatings on a ductile substrate
  
  • Ganne T.
  • Crépin Jérôme
  • Farges G.
  • Pradeilles-Duval R. M.
  • Zaoui A.
  , 2001. No abstract provided
• Multiscale approach for anisothermal high-cycle fatigue
  
  • Nguyen-Tajan T. M. L.
  • Maitournam Habibou
  • Dang Van K.
  , 2001, pp.875-882. No abstract provided
• A macroscopic crack initiation criterion in multiaxial thermomechanical fatigue
  
  • Verger Laetitia
  • Charkaluk Eric
  • Constantinescu Andrei
  , 2001, pp.867-874.
• Rolling contact fatigue on afnor 32cdv13 steel: high cycle multiaxial fatigue
  
  • Coelho L.
  • Lieurade H. P.
  • Merrien P.
  • Maitournam Habibou
  • Dang Van K.
  • Dias A. M.
  , 2001, pp.451-458. No abstract provided
• Avoiding the Bloat with Stochastic Grammar-based Genetic Programming
  
  • Ratle Alain
  • Sebag Michèle
  , 2001, 2310, pp.254-266. 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 gra mmar 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 intron growth.
• An “Affine” Micromechanical Approach for the Prediction of the Elastoplastic Behavior of Polycrystals at Finite Strain
  
  • Auslender François
  • Bornert Michel
  • Zaoui André
  • Hoc T.
  • Masson Renaud
  , 2003. The so-called “affine” formulation, already proposed at small strain, has been proved to improve significantly on former treatments such as Hill’s incremental one. This paper reports on an extension of this treatment to finite strain. A linearization procedure, consistent with the one used for small strains, is proposed. This extension has to solve general problems related to the application of classical homogenization schemes to finite strain situations, as well as new ones which are specific to the affine formulation. Preliminary results concerning the tensile stress-strain response of fcc polycrystals are favorably compared with those derived from Hill’s approach. (10.1007/978-94-017-0297-3_27)
  DOI : 10.1007/978-94-017-0297-3_27