General information
Organisation
The French Alternative Energies and Atomic Energy Commission (CEA) is a key player in research, development and innovation in four main areas :
• defence and security,
• nuclear energy (fission and fusion),
• technological research for industry,
• fundamental research in the physical sciences and life sciences.
Drawing on its widely acknowledged expertise, and thanks to its 16000 technicians, engineers, researchers and staff, the CEA actively participates in collaborative projects with a large number of academic and industrial partners.
The CEA is established in ten centers spread throughout France
Reference
SL-DAM-24-0028
Direction
DAM
Thesis topic details
Category
Engineering science
Thesis topics
Analysis of the dynamic response of Molybdenum to a laser shock
Contract
Thèse
Job description
Since recently, Molybdenum has been considered as a material of interest in many dynamic configurations, especially in Defense applications such as for shaped charge liners, where extreme dynamic loadings (high strain rates, large strains, high pressures …) are encountered. Nonetheless, this material has been essentially characterized through quasi-static experiments or under extreme pressures related to planetology issues for instance.
At the meantime, laser shock experiments have gained in importance. Indeed, compared to other dynamic loading techniques (impacts, explosives …), laser-driven shocks offer a large loading range capability (by varying intensity, size and duration of the laser pulse), some insight into the plastic behavior of the materials at extremely high strain rates, and easy sample recovery for a variety of post-mortem analyses.
The main objective of this PhD, co-supervised by Institut Pprime (CNRS, ISAE-ENSMA) in Poitiers (France), is to characterize the behavior of laser shock-loaded Molybdenum over a range of loads representative of shaped charges, to test and to improve whenever possible the predictive capabilities of existing models. Innovative configurations will be studied.
For that purpose, the student will have to design, to carry out and post-process various laser shock experiments so as to :
- Characterize the elasto-plastic behavior of Molybdenum through time-resolved velocity measurements and possibly temperature measurements ;
- Realize post-mortem analyses on Molybdenum specimens ;
- Analyze the implosion phase representative of what generates shaped charges jets on notched specimens ;
- Analyze the effects of inclined shocks on Molybdenum.
University / doctoral school
Poitiers
Thesis topic location
Site
Gramat
Requester
Position start date
01/09/2023
Person to be contacted by the applicant
EL MAÏ SKANDER skander.elmai@cea.fr
CEA
DAM GRAMAT
CEA
Centre de Gramat
BP 80200
46500 GRAMAT
05 65 10 57 15
Tutor / Responsible thesis director
DE RESSEGUIER THIBAUT resseguier@ensma.fr
ENSMA Poitier
Institut Pprim - UPR CNRS 3346
Institut Pprim - UPR CNRS 3346 - ENSMA - BP40109 - 86961 Futuroscope
05 49 49 81 73
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