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Multi-scale topography and evolutionary leakage of a sliding contact: experimental approach and modeling

Abstract : Pumps allow the transfer of a product (glue, lubricant, petrol, etc.) to the pressurised spraying system. Being present in a multitude of industries, their reliability is of major importance for the protection of the environment and health. We study the impact of surface finish on the functionality (tightness, wear) of different systems, within pumps and spraying systems. A multi-scale characterization method is thus implemented in order to understand the impact of the surface finish of parts on the functionality of these systems. This method is applied on a first characterization study of the tightness of reversible nozzles. It is not always easy to interpret the impact of the morphology of a surface on its functionality using roughness parameters. A contact model and a contact distribution visualization tool are therefore developed. The contact interface is thus computed to better understand the contact distribution and leakage paths. The next part of the thesis aims to characterize the seal/wear torque of a hydraulic piston. A test bench is developed to characterize the wear, tightness and topography of the studied parts. Thus, the degradation of the surface state of a piston is analyzed as a function of its tightness. In order to apply the study of the seal/wear coupling to other similar contacts, a numerical model, capable of calculating the hydraulic conductance of a sliding contact between two rough surfaces, is being developed. Finally, coatings that could replace hard chromium are being tested for wear. The use of hard chromium plating is highly regulated and will be banned in the future. Thus, the comparative degradation of different coatings under the same wear conditions is being studied.
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Submitted on : Monday, October 11, 2021 - 3:55:55 PM
Last modification on : Tuesday, October 12, 2021 - 3:44:17 AM

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  • HAL Id : tel-03373680, version 1

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Camille Bataille. Multi-scale topography and evolutionary leakage of a sliding contact: experimental approach and modeling. Engineering Sciences [physics]. Université Polytechnique Hauts-de-France, 2020. English. ⟨NNT : 2020UPHF0008⟩. ⟨tel-03373680⟩

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