A PhD scholarship in Laser Optics has been announced for the academic year 2011. The PhD scholarship is in association with the Institute of Nuclear Sciences, France. The research area for this PhD scholarship is Optics - Laser optics - Applied optics / Engineering science, Metrology / Engineering science.
Title: Study of a cloud of particles ejected from a shock loaded metal plate
Abstract: A shock loaded metal plate (tin, a few 10 GPa) is set in motion and may suffer damages on its back face, such as spalling or the ejection of a cloud of particles. This latter phenomenon depends on two main behaviours: microjetting (solid particles ejected from micro hollow charge consequence of the machining step), and the melting induced by the increasing temperature within the released matter.
The purpose of this thesis is to characterize the particles in this cloud in terms of mass surface density, in terms of speed laws (initial speed, braking, acceleration ....), diameters or even shapes.
We plan a theoretical approach based on hydrodynamic simulations, using ejection then interaction with ambient gas models but also on optical and photometric simulations for laser measurements. This approach will be supported by experimentations with high explosive, gun launcher or high power laser. Several types of diagnostics are available individually or simultaneously: mainly Photonic Doppler Velocimetry (PDV) which gives access to the speed laws versus time, but also light diffraction, X-ray radiography or Asay foil weighings. Finally, particles can be caught during the experiment, for post-mortem analysis (micro-tomography).
Location:
DCRE
SCEF
Starting date: 01/09/2011
Centre : DAM Ile de France
Contact person:
Patrick MERCIER
CEA / DAM/DCRE/SCEF/LCDT
CEA DAM Ile de France
Email : patrick.mercier@cea.fr
Phone: 01 69 26 62 54
University/Graduate School:
Poitiers
Sciences et Ingénierie en Matériaux, Mécanique, Energétique et Aéronautique (SI-MMEA) - Poitiers
Thesis supervisor:
Laurent BERTHE
CNRS / Laboratoire pour l'Application des Lasers de Puissance
Laboratoire Procédés et Ingéniérie en Mécanique et Matériaux
Arts et métiers Paristech
151 boulevard de l'Hôpital
75013 Paris
France
email: lberthe@gmail.com
Note: Application deadline to the PhD scholarship in Laser Optics, France is March end, 2011.
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