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Approche multi-physique des relations Procédés Jets fluides - Propriétés Matériaux. De l’étude des phénomènes à la valorisation et au transfert au monde socioéconomique.

Abstract : High Pressure (HP) fluid jet processes are used as methods for modifying the properties of materials by cold spraying and high-speed multi-component fluids on the substrate to be treated. Depending on the hydrodynamic and physical characteristics of the impinging jet, such modifications can be obtained by either removing or adding material or without causing any change in the substrate mass. For this, the jet is used as a complex flow carrying physical, chemical, biological, and energy of different natures such as kinetic, thermal. In theory, both these properties and energies are then transferred to the target material via the surface of the substrate according to complex mechanisms as mechanical, thermal, thermomechanical, and inducing metallurgical and microstructural transformations. This work focuses on the relationships of some industrial configurations of complex fluid jets and the surface properties of materials impacted by such impinging fluid jets. The research methods developed in this work provide a framework for several materials issues that are addressed by the considered fluid jet processes. After a brief presentation of each material issue, this work assembles the study of the peculiarities of three types of innovative fluid jets as well as those of four interactions of these jets with materials representative of industrial cases. To determine the behavior as well as the physical and hydrodynamic properties of each type of jet, both qualitative and quantitative approach to modeling the structures of the constitutive phases is presented for namely: low pressure abrasive micro-waterjet, HP waterjet assisted laser, HP supercritical cryogenic nitrogen jet. Knowledge of the scientific and technological fundamentals describing these fluid jets has made it possible to explain the various complex mechanisms of interactions of the studied fluid jets with materials as used in industry: HP waterjet assisted laser - metallic materials, HP supercritical nitrogen jet - metallic and polymer materials, HP supercritical nitrogen jet - porous woody materials, HP supercritical nitrogen jet – polymer based materials.
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https://hal.univ-lorraine.fr/tel-03206345
Contributor : Abdel Tazibt <>
Submitted on : Friday, April 23, 2021 - 11:28:19 AM
Last modification on : Friday, April 23, 2021 - 11:57:32 AM

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Abdel Tazibt. Approche multi-physique des relations Procédés Jets fluides - Propriétés Matériaux. De l’étude des phénomènes à la valorisation et au transfert au monde socioéconomique.. Physique [physics]. Université de Lorraine; École doctorale C2MP - Chimie mécanique matériaux physique (Lorraine), 2020. ⟨tel-03206345⟩

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