PhD opportunities

[PROVIDED] - Development of miniature samples to evaluate the toughness of transport tubes for H2 applications

Thesis proposal

Area of expertiseMechanics
Doctoral SchoolISMME - Systems Engineering, Materials, Mechanics, Energy
SupervisorM. Yazid MADI
Research unitCentre of materials
ContactMADI Yazid
http://www.mat.mines-paristech.fr/Accueil/Propositions-de-theses/
Starting dateOctober 1st 2021
KeywordsMiniature samples, Toughness, Size effect, Steel, Hydrogen embrittlement
AbstractThis thesis will be carried out within the framework of the ANR industrial chair 'MESSIAH' in partnership with Air Liquide (AL) and Mannesmann Precision Tubes France SAS (MPTFR).

The MESSIAH program proposes to use mini-specimen (thickness: 1-3 mm) extracted from in-service facilities to evaluate and monitor the ageing of the installations and the decrease of mechanical properties due to hydrogen.Conducting tests on mini-specimens is a challenge. It requires studying and writing test protocols including : samples extraction, machining, pre-cracking, testing, extensometry (mechanical or optical), and extending thoses procedures to the study of hydrogen embrittlement which may need the developement of hydrogen loading devices that can be used on the mechanical testing machines.
The classification and processing of the extensive amount of data will require the use of standardized terminology and metadata. The results will be gathered and processed using DATMECHA program suite developed at the Centre of Materials and will be used to adjust behavior laws. These laws are necessary to properly interpret/validate the results of tests on cracked specimens and will be used with Zset finite elements code developed at the Center of Materials to simulate the test base.
The modeling of hydrogen embrittlement requires to take into account: plasticity, kinetics of hydrogen diffusion in a stress gradient, hydrogen trapping as well as the effect of hydrogen on the plasticity.
The advanced numerical developments to describe the fracture and the effect of hydrogen on the behavior of metals will be carried out in the framework of another thesis supported by the MESSIAH project. These tools will allow the analysis of the test database and the validation of the methodology of transfer from mini-specimen to standardised ones.
ProfileEngineer and / or Master of Science - Good level of general and scientific culture. Good level of knowledge of French (B2 level in french is required) and English. (B2 level in english is required) Good analytical, synthesis, innovation and communication skills. Qualities of adaptability and creativity. Teaching skills. Motivation for research activity. Coherent professional project.

Prerequisite (specific skills for this thesis):
Excellent bakcground in mechanics and metallurgy. Knowledge of welding process is beneficial. Aptitude for experimental work. Accuracy.

Applicants should supply the following :
• a detailed resume
• a copy of the identity card or passport
• a covering letter explaining the applicant’s motivation for the position
• detailed exam results
• two references : the name and contact details of at least two people who could be contacted
• to provide an appreciation of the candidate
• Your notes of M1, M2
• level of English equivalent TOEIC
to be sent to recrutement_these@mat.mines-paristech.fr
FundingContrat de recherche