Publications Scientifiques

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Subject: search.filters.subject.Loss factor

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    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 elastomer
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    Forced transverse vibration of composite sandwich beam with magnetorheological elastomer core
    (Springer, 2016) Aguib, Salah; Nour, Abdelkader; Djedid, Toufik; Bossis, Georges; Chikh, Noureddine
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    Dynamic behavior analysis of a magnetorheological elastomer sandwich plate
    (Elsevier, 2014) Aguib, Salah; Nour, Abdelkader; Zahloul, H.; Bossis, G.; Chevalier, Y.; Lançon, P.
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    Modeling rot in wood by replacement of wood with sand : an experimental study
    (2006) Zerizer, A.; Ouis, D.
    Rot is known to affect the strength properties of wood. At the same time, the damping properties of the attacked material have also been shown to change. This article presents the results of an experimental study in which rot in wood was modeled by the replacement of wood with sand. The procedure entailed the drilling of holes in the body of a wooden beam, filling the holes with sand, and monitoring the changes induced by the sand-filled holes on the values of the modulus of elasticity (MOE) and of the loss factor. The MOE was calculated from the resonance frequency of the first longitudinal mode of vibration, and the loss factor was obtained indirectly from the impulse response by means of a room acoustical technique. The results show that the MOE value, and hence the strength characteristic of the wood specimen, decreases at the same time as the loss factor increases