Publications

2001

• Increasing the maximum strain measured with the elastic and viscoelastic Hopkinson bars
  
  • Othman Ramzi
  • Bussac Marie-Noëlle
  • Collet Pierre
  • Gary Gérard
  , 2001.
• Un exemple d'onde stick-slip
  
  • Moirot F.
  • Nguyen Q. S.
  , 2001, pp.229-236. No abstract provided
• Evolution de la pression dans une caverne remplie de fluide
  
  • Bérest P.
  • Brouard B.
  • Bergues J.
  • Durup G.
  , 2001, pp.96. No abstract provided
• Matériaux du nucléaire
  
  • Zaoui A.
  , 2001.
• 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
• Back analysis on mechanical behaviour of joints, using a new method based on virtual work principle
  
  • Deng D.
  • Nguyen-Minh D.
  , 2001, pp.915-919. No abstract provided
• Exploiting partial or complete geometrical symmetry in boundary integral equation formulations of elastodynamic problems
  
  • Bonnet Marc
  , 2001, pp.253-270. Procedures based on group representation theory, allowing the exploitation of geometrical symmetry in symmetric Galerkin BEM formulations of 3D elastodynamic problems, are developed. They are applicable for both commutative and noncommutative finite symmetry groups and to partial geometrical symmetry, where the boundary has two disconnected components, one of which is symmetric. (10.1007/978-3-642-56288-4_18)
  DOI : 10.1007/978-3-642-56288-4_18
• θ-Subsumption in a Constraint Satisfaction Perspective
  
  • Maloberti Jérôme
  • Sebag Michèle
  , 2001, 2157, pp.164-178. The covering test intensively used in Inductive Logic Programming, i.e. θ-subsumption, is formally equivalent to a Constraint Satisfaction problem (CSP). This paper presents a general reformulation of θ-subsumption into a binary CSP, and a new θ-subsumption algorithm, termed Django, which combines some main trend CSP heuristics and other heuristics specifically designed for θ-subsumption. Django is evaluated after the CSP standards, shifting from a worst-case complexity perspective to a statistical framework, centered on the notion of Phase Transition (PT). In the PT region lie the hardest on average CSP instances; and this region has been shown of utmost relevance to ILP [4]. Experiments on artificial θ-subsumption problems designed to illustrate the phase transition phenomenon, show that Django is faster by several orders of magnitude than previous θ-subsumption algorithms, within and outside the PT region. (10.1007/3-540-44797-0_14)
  DOI : 10.1007/3-540-44797-0_14
• Modification du critère de Gurson par une approche micromécanique
  
  • Bilger Nicolas
  • Auslender François
  • Bornert Michel
  • Masson Renaud
  • Zaoui André
  , 2001.
• Some recent advances in symmetric Galerkin boundary element methods and their coupling with finite elements
  
  • Bonnet Marc
  , 2001.
• Moving discontinuities: applications to fracture and wear
  
  • Stolz Claude
  , 2001.
• Tomographie aux rayons X de l'écoulement du sucre en poudre ensilé
  
  • Luong M. P.
  , 2001. No abstract provided
• Caractérisation de l'écrouissage dans des monocristaux de Zirconium
  
  • Lecomte J. S.
  • Crépin Jérôme
  • Philippe Marie-Jeanne
  , 2001.
• 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.
• Multiaxial fatigue criteria based on a multiscale approach
  
  • Dang Van K.
  , 2001, pp.457-463. Prediction of high-cycle fatigue resistance is of great importance for structural design. In spite of this clear industrial need, until now modeling of metal behavior in a high-cycle fatigue regime was often based on empirical approaches: the Wöhler curve and the Goodman-Haigh or Gerber diagrams are still the very popular tools for engineers. However, these concepts are not appropriate when studying the multiaxial stress cycles that are frequently encountered on modem mechanical components. These multiaxial stresses arise from factors such as external loadings, the geometry of the structure, which can induce multiaxiality even if the loading is uniaxial, and finally residual stresses. (10.1016/B978-012443341-0/50052-1)
  DOI : 10.1016/B978-012443341-0/50052-1
• Branch crack development from the flank of a fatigue crack propagating in mode II
  
  • Doquet Véronique
  • Frelat Joël
  Fatigue and Fracture of Engineering Materials and Structures, Wiley-Blackwell, 2001, 24 (3), pp.207-214. The propagation of fatigue cracks in mode II often leads to the development of a branch starting from a crack flank, some distance behind the tip and not to the expected bifurcation at the crack tip. This type of branch is suggested to initiate by decohesion along a secondary slip plane and to grow in mode I due to the tensile component of the mode II stress field. Finite element calculations are performed to evaluate the stress intensity factors for the main crack and the branch as a function of the position of the latter. It is shown that the branch has a substantial shielding effect on the main crack and generates contact forces along its flanks. The simultaneous and competitive growth of the main crack and the branch in fatigue is simulated step by step using kinetic data for mode II and mode I obtained for a maraging steel. (10.1046/j.1460-2695.2001.00384.x)
  DOI : 10.1046/j.1460-2695.2001.00384.x
• Homogénéisation en mécanique des matériaux
  
  • Bornert Michel
  • Bretheau Thierry
  • Gilormini Pierre
  , 2001, pp.250 pages.
• Approches multi-échelles en Mécanique des Matériaux
  
  • Zaoui A.
  , 2001.
• Changement d'échelle: motivation et méthodologie
  
  • Zaoui A.
  , 2001, pp.19-39.
• Observation infrarouge de l'endommagement des cordes de tennis
  
  • Luong M. P.
  , 2001. No abstract provided
• Multidisciplinary design of woven composites
  
  • Zarka J.
  • Doux T.
  , 2001. No abstract provided
• Modélisation micromécanique de la phase lamellaire des alliages TiAl
  
  • Gélébart Lionel
  • Bretheau Thierry
  • Crépin Jérôme
  • Bornert Michel
  , 2001.
• Approche expérimentale de l'homogénisation
  
  • Bretheau T.
  , 2001, pp.147-169.
• Approches par les potentiels
  
  • Bornert Michel
  • Suquet P.
  , 2001, pp.45-90.