Browsing by Author "Rouabah, Salah"

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    Experimental characterization of microcomposite magnetorheological elastomer
    (2021) Rouabah, Salah; Aguib, Salah; Hadji, Mohamed; Kobzili, Lallia
    This work presents an analysis experimental of dynamic properties of microcomposite magnetorheological elastomer (MMRE) by a dynamic mechanical analyzer (DMA). The charge of magnetized iron particles is 30% of the total volume. A dynamic mechanical analysis DMA was carried out, in the scanning mode of the amplitude of shear strain, and for magnetic field densities varying from 0mT to 325mT. The storage modulus G’ and the loss modulus G’’, of the elastomer decrease, when the amplitude of the strain increases. This trend is more pronounced under a higher magnetic flux density (250mT and 325mT). In the presence of the magnetic field, the level of these two dynamic moduli and of the damping increases considerably, passing from one value to another of the applied external magnetic field. As a result, the MR effect of MRE elastomers has increased significantly with increasing magnetic flux density
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    Structures fissureées, méthodes numérique aux éléments frontières
    (2006) Rouabah, Salah
    Le travail effectué dans le cadre de ce mémoire, se rapporte au développement et la mise en oeuvre d’un modèle numérique concrétisant la méthode d’éléments frontières "BEM", pour l’analyse des problèmes tridimensionnels de la mécanique de la rupture linéaire dans les solides élastiques isotropes fissurés. En plus ce modèle peut être appliqué sur les solides finis et infinis. La présente méthode "BEM" se base sur la résolution des équations intégrales de frontière, notamment, celle en déplacement. Cette dernière est résolue exclusivement sur la frontière de la fissure, dont les inconnues physiques sont les déplacements et/ou contraintes qui sont déterminés sur une seule surface de la fissure (problèmes symétriques). Deux applications pour l’évaluation du facteur d’intensité de contraintes en mode I dans le cas des fissures circulaires et elliptiques sont réalisées. Les résultats obtenus dans la présente étude sont très concluants
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    The Advancing Understanding of Magnetorheological Fluids and Elastomers: A Comparative Review Analyzing Mechanical and Viscoelastic Properties
    (Multidisciplinary Digital Publishing, 2025) Rouabah, Salah; Didouche, Fadila-Yasmina; Khebli, Abdelmalek; Aguib, Salah; Chikh, Noureddine
    Magnetorheological fluids (MRFs) and elastomers (MREs) are two types of smart materials that exhibit modifiable rheological properties in response to an applied magnetic field. Although they share a similarity in their magnetorheological response, these two materials differ in their nature, structure, and mechanical behavior when exposed to a magnetic field. They also have distinct application differences due to their specific rheological properties. These fundamental differences therefore influence their properties and applications in various industrial fields. This review provides a synthesis of the distinct characteristics of MRFs and MREs. The differences in their composition, rheological behavior, mechanical properties, and respective applications are summarized and highlighted. This analysis will enable a comprehensive understanding of these differences, thereby allowing for the appropriate selection of the material based on the specific requirements of a given application and fostering the development of new applications utilizing these MR materials