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Theses

Modélisation expérimentale de phénomènes électrostatiques et tribologiques aux interfaces solide/solide

Abstract : The approach undertaken in this thesis is to explore the possibility of using the electrostatic charge to improve the dry or lubricated (two oils with different viscosity and distilled water) sliding contacts between polymeric materials (PP, PE, PS, and ABS, two types of PVC). Three experimental benches were designed and built. The first installation is a linear tribometer designed to study the sliding contacts between solids with dry or lubricated friction. It allows the adjustment to four control variables of the tribocharging process: normal force, sliding speed, time and stroke, and the measurement of three characteristics of the friction regime: the tangential force, the variation of the normal force and the relative displacement between the specimens. The second installation is a device for measuring the distribution of the surface electrical charge, and for correlating it with the temperature mappings. A third installation is designed to study the influence of the electric charge on the contact angle of droplets deposited on the surface. The experiments showed that the level of the charge generated by dry friction depends on the friction time, the wear, the contact pressure and the roughness. A charge generated by friction or by corona discharge can increase dry friction. On the other hand, the presence of electric charge on the surface of polymers can improve a lubricated contact. The contact angle measurements pointed out the influence of the nature of both solid and liquid materials involved in the contact, as well as of the electric charge of the samples.
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Marian-Bogdan Neagoe. Modélisation expérimentale de phénomènes électrostatiques et tribologiques aux interfaces solide/solide. Mécanique des matériaux [physics.class-ph]. Université de Poitiers, 2017. Français. ⟨NNT : 2017POIT2294⟩. ⟨tel-02064651⟩

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