PhD opportunities

Thermal diffusivity cartography of heterogeneous and anisotrope materials : Application to asteroidal surfaces

Thesis proposal

Area of expertiseComputational mechanics and Materials
Doctoral SchoolSFA - Sciences Fondamentales et Appliques
SupervisorM. Franck PIGEONNEAU
Research unitCentre for material forming
KeywordsAsteroid, heterogeneous material, thermal diffusivity, inverse method
AbstractThe atmosphereless celestial bodies, such as asteroids, are covered with a soil that lies on the original bedrock. This soil, called regolith, is a layer of dust whose grains can vary from the size of fine particles smaller than one millimeter to gravel much larger than a millimeter.
The understanding of the formation of the regolith and its evolution over time is of vital interest both to diagnose the nature of these celestial bodies (interface between the radiation and the celestial body) and to sample them (OSIRIS-REx space missions of the NASA and Hayabusa of the JAXA).
The objective of this thesis is to establish maps of thermal diffusivities of heterogeneous proxy materials (meteorites) from thermal laser experiments (front face) and the treatment of the temperature field recorded by an infrared camera. The methods used make it possible to estimate the thermal properties in the 3 directions of space by inverse method and integral transformation. These techniques combined with spectral zooming methods will provide access to more local information on the thermal properties of heterogeneous materials in general, and eventually to regolith formation and evolution models.
ProfileHeat transfer, thermal radiation, materials science, scientific computation: partial differential equations, inverse methods, experiment
FundingFinancement d'un Etablissement d'enseignement suprieur