Publications

2000

• Effets d'un préécrouissage ou d'un surécrouissage cyclique sur la durée de vie en fatigue de divers aciers, à contrainte ou déformation imposée.
  
  • Doquet Véronique
  • Taheri Said
  Revue Française de Mécanique, 2000, 1, pp.27-33.
• Plastic heterogeneities of a copper multicrystal deformed in uniaxial tension: experimental study and finite element simulations
  
  • Delaire F.
  • Raphanel Jean L
  • Rey Colette
  Acta Materialia, Elsevier, 2000, 48, pp.1075-1087. A copper sample made of a single layer of grains is plastically deformed by uniaxial tension at room temperature and low strain rate. The deformation field is measured by means of grids deposited on the polished surface of the undeformed specimen and local orientations are recorded using electron back scattering diagrams in a scanning electron microscope. These measures are compared with simulations made by a finite element code using a physically based model for the deformation and hardening of face centered cubic crystals. A good agreement is found between measured and computed values. The simulations give access to much more detail about the history of glide in each grain and help establish which systems are active at a local level. They also provide the evolution of internal variables such as dislocation densities. A new insight into intergranular accommodation as well as intragranular heterogeneities is provided. (10.1016/S1359-6454(99)00408-5)
  DOI : 10.1016/S1359-6454(99)00408-5
• An inverse approach to determine the non-linear properties of induction heat-treated steels
  
  • Niclas André
  • Bourgeois Lament
  European Journal of Mechanics - A/Solids, Elsevier, 2000, 19, pp.69-88. The identification of the through-the-thickness variation of the non-linear properties of a steel structure due to a heat treatment by induction is considered. An inverse approach to that problem is proposed, which is based on a 4-point bending test of a heat-treated parallelepipedic bar. It includes a layer-removal method for measuring residual stresses. Precisely, two different inverse methods are described. For a medium carbon steel, an application based on experimental data is performed, which shows the efficiency of our approach and a good agreement between the two methods. (10.1016/S0997-7538(00)00152-2)
  DOI : 10.1016/S0997-7538(00)00152-2
• Computational and experimental investigations of the local strain field in elastoplastic two-phase materials
  
  • Doumalin Pascal
  • Bornert Michel
  • Soppa Ewa
  , 2000, pp.323-328.
• Surface deformation analysis of composites by mesomechanics
  
  • Soppa E.
  • Doumalin Pascal
  • Bornert Michel
  • Schmauder S.
  , 2000, 3, pp.443-449. No abstract provided
• Micromechanical applications of digital image correlation techniques
  
  • Doumalin P.
  • Bornert Michel
  , 2000, pp.67-74. No abstract provided
• Application of modal analysis and synthesis of reed and pipe to numerical simulations of a clarinet
  
  • Facchinetti Matteo
  • Boutillon Xavier
  • Constantinescu Andrei
  , 2000, 108 (5), pp.2590-2590. A finite-element model of a complete clarinet is proposed in order to simulate the acoustical dynamics of the instrument. Following the work of Pinard and Laine on isolated reeds [unpublished reports of the Ecole Polytechnique], modal analysis of clarinet reeds performed with holographic interferometry has been compared with modal synthesis derived from the FEM. In this linear model, the reed is considered alone first, then coupled to the mouthpiece, and finally to the mouthpiece and the barrel. The good agreement between the two approaches makes the mixed solid-acoustical FEM usable in a numerical simulation of the whole clarinet. The rest of the pipe is modeled by lumped mechanical elements whose parameters are fitted with measurements of the acoustical input impedance. Eigenmodes of the complete system—reed, mouthpiece, barrel, pipe—are computed and damping is subsequently attributed to each mode. The evolution of the system subject to nonlinear boundary conditions—incoming airflow, one-sided contact of the reed against the curved lay of the mouthpiece—is computed in the time domain: at each time step, external forces and internal variables are projected onto the modal basis and the evolution of each modal amplitude is integrated. Findings of the simulations will be discussed. <p style="color:red">[NO PDF]</p> (10.1121/1.4743630)
  DOI : 10.1121/1.4743630