Yazar "Kchaou, Mohamed" seçeneğine göre listele

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    Impact of brass contents on thermal, friction and wear properties of brake linings composites
    (EDP SCIENCES S A, 2018) Sellami, Amira; Kchaou, Mohamed; Kus, Recai; Fajoui, Jamal; Elleuch, Riadh; Jaquemin, Frederic
    Automotive brake lining materials are composite materials of very complex formulation, highly heterogeneous. They help to carry out the desired combination of braking performance properties. Obviously, it requires that the friction material exhibits a good complementarities and adequate combination of physico-chemical, thermal properties that act synergistically to provide the braking performance which should be adjusted by the addition of metallic fillers. The aim of this work is to study the role of one of the copper alloy particles, namely brass, on friction and wear. For this purpose, the experimental approach is based on the development of a simplified formulation. Three derived composites were developed in the laboratory by the addition 1.5 wt.%, 3 wt.% and 4.5 wt.% of brass. It is shown that addition of copper alloy particles increased thermal properties. Wear test results show that brass contributes to friction and wear mechanisms from a quantity introduced in the formulation equal to 4.5 wt.%. In fact, given its large size, it acts as primary plates serving as supports for the formation and expansion of plates necessary to enhance the stability of friction coefficient. Conversely, when adding an amount less than 4.5%, brass particles are generally all removed from the matrix implying a higher source flow of third-body wear.
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    Wear mechanisms of different engineering systems under higher solicitations: Overview and case studies
    (PERGAMON-ELSEVIER SCIENCE LTD, 2018) Sellami, Amira; Hentati, Nesrine; Kchaou, Mohamed; Kus, Recai; Elleuch, Riadh; Chowdhury, Mohammad Asaduzzaman
    Today's, vehicle systems and components require more interaction and innovation in mechanical systems. Furthermore, mechanical components should ensure by its properties the required functionalities. Potentially, under service, those systems are able to cause severe accidents. The particular attention is according to the improving requirements engineering in the choice of the material especially for automotive components submitted to higher stress level (induced by mechanical, thermal, tribological solicitations). Wear phenomena play a huge role in the effectiveness and durability of the vehicle system. The understand of wear as a failure mechanism induced by coupling and transient phenomena are fundamental in an innovative and creative process to improve automotive performance. Three cases of wear reported by the automotive industries are discussed in the text above: case 1: axle shaft of a motor vehicle, case 2: synchronizer rings, case 3: brake lining material.