Publications Scientifiques
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Item Numerical simulation and experimental analysis of magneto-mechanical behavior of anti-seismic active sandwich structure(Extrica, 2019) Zerrouni, Nassim; Aguib, Salah; Grine, Ali; Chikh, NoureddineThis work focuses on the quasi-static behavior study for simply supported sandwich beams with aluminum faces and magnetorheological elastomer core subjected to three points bending subjected to a magneto-mechanical loading by numerical and experimental investigations. The mechanical properties of the magnetorheological elastomer core are measured experimentally and the mechanical behavior of the MRE was identified by the generalized Maxwell rheological model. Depending upon the adjustable properties of the beam, energy dissipation is by core shear. A systematic series of experiments and finite elements simulations have been performed in order to assess the static behavior of the beam. The results obtained show a significant influence of the magnetic field intensity on the flexural displacement of the beam.Item Hydrodynamic instabilities in swirling flow under axial magnetic field(ELSEVIER, 2021) Laouari, A.; Mahfoud, B.; Bessaïh, R.; Hadjadj, A.The present paper investigates numerically the hydrodynamic instabilities occurring in a cylindrical container filled with a conducting viscous fluid and submitted to an axial magnetic field. The axisymmetric swirling flow produced by rotation of the bottom disk, in which a vortex breakdown bubble occurred on the axis of symmetry. This flow structure represents one of the most important instabilities. The governing Navier–Stokes and potential equations are solved by using the finite-volume method. For both steady-state and oscillatory regimes, various combinations of the top, bottom, and side walls conductivity are considered. The effects of the magnetic field and wall electrical conductivities on the position of vortex breakdown and his disappearance is developed. The results obtained showed that the vortex breakdown is suppressed beyond the magnitude of the magnetic field exceeds a critical value. The stability diagram (Ha–Re) corresponding to the vortex breakdown disappearance for electrically conducting and insulating walls is obtained.Item Vibration control of a hydrostatic bearing using magnetorheological elastomer shell bearing(JVE International, 2018) Chikh, Noureddine; Aguib, Salah; Djedid, Toufik; Nour, Abdelkader; Tawfiq, ImadIn rotating machines, random movements or sliding movements of the rotor in its housing can produce undesirable phenomena for some parts. To solve this problem, a new hydrostatic bearing with an intelligent magnetorheological elastomer sell bearing has been designed to control the undesirable vibrations of rigid rotors. The different effects of the influence parameters on the vibratory behavior of the sell bearing are calculated numerically using Abaqus software, and the results found are encouragingItem Numerical study of the effect of transverse magnetic field on cylindrical and hemispherical CZ crystal growth of silicon(Thomson Scientific, 2010) Mokhtari, Faiza; Bouabdallah, Ahcene; Merah, AbdelkrimItem Numerical investigation of magnetic field effect on pressure in cylindrical and hemispherical silicon CZ crystal growth(Wiley, 2012) Mokhtari, Faiza; Bouabdallah, Ahcene; Merah, Abdelkrim; Oualli, HamidItem Symmetry breaking in electromagnetic spherical Cz crystal growth with rotating crystal and crucible(American Scientific Publishers, 2013) Mokhtari, Faiza; Bouabdallah, A.; Merah, AbdelkrimItem Dynamic Analysis of the Non-Linear Behavior of a Composite Sandwich Beam with a Magnetorheological Elastomer Core(2016) Chikh, N.; Nour, Abdelkader; Aguib, Salah; Tawfiq, I.This work deals with the active control of the vibrations of mechanical structures incorporating magnetorheological elastomer. The damping coefficient and shear modulus of the elastomer increase when exposed to a magnetic field. Compared with the vibration control where the elastomer is permanently exposed to a magnetic field, the control of this process through time reduces vibrations more effectively. The experimental study for the vibrations of a sandwich beam filled with an elastomer is conducted, followed by a numerical study using the Abaqus code. The vibration damping is found to be dependent on the loading rate of micro-size ferromagnetic particles in the elastomerItem Forced transverse vibration of composite sandwich beam with magnetorheological elastomer core(Springer, 2016) Aguib, Salah; Nour, Abdelkader; Djedid, Toufik; Bossis, Georges; Chikh, NoureddineItem Low magnetic field Impact on NBTI degradation(Elsevier, 2015) Merah, Sidi Mohammed; Nadji, B.; Tahi, H.