Laboratoire de Physique des Solides - UMR 8502

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Raphaelle Taub

PhD Student

Email: raphaelle.taub@u-psud.fr
Tel: 0169156960
Office: 071 - west wing.

PhD advisor : Frédéric Restagno and Christophe Poulard

Research: Complex interleaved materials

The aim of this thesis is to get a better understanding of different situation where we deal with complex interleaved system. To achieve this objective, the thesis program is divided in 2 main questions: 1) Our first objective is to elucidate the role of some parameters that have been neglected in the preliminary study concerning the friction amplification in interleaved systems. These three parameters are: i) The bending rigidity in interleaved systems. Qualitatively, if we interleave systems with a bending rigidity, the latter is expected to create a supplementary normal force and thus a further increase of friction. ii) The adhesion. Therein, the tangential resistance to displacement is no more proportional to the normal load. In systems like elastomeric sheets, the onset of friction should be more likely described like a zero-angle peeling test. iii) Hydrodynamical forces. Therein the lubrication pressure leads to an extra normal force which tends to separate the layer. It is thus an example of complex fluid-structure interaction. In parallel, of this task based on including complex interactions between the assembled elements, we want to extend the previous study to other systems. 2) The second objective will be devoted to the friction amplification in an assembly of fibers. A rope is a group of yarns, plies, or strands that are twisted or braided together into a larger and stronger form. Ropes have tensile strength and so can be used for dragging and lifting, but are too flexible to provide compressive strength.

Our aim is to understand how the friction is amplified in these kind of systems to allow the different fibers to stay together in the rope. Approach: The thesis will be mainly experimental but will benefit from a close collaboration with E. Raphaël and T. Salez from ESPCI. This will allows a theoretical part in this thesis.