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Portail > Offres > Offre UMR7329-VALMER-033 - Chercheur (H/F) en mécanique de la fracture expérimentale

Researcher (H/F) in experimental fracture mechanics

This offer is available in the following languages:
Français - Anglais

Date Limite Candidature : jeudi 15 décembre 2022

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General information

Reference : UMR7329-VALMER-033
Workplace : VALBONNE
Date of publication : Thursday, November 24, 2022
Type of Contract : FTC Scientist
Contract Period : 24 months
Expected date of employment : 1 March 2023
Proportion of work : Full time
Remuneration : According to professional experience = minimum base of 2833€ gross monthly
Desired level of education : PhD
Experience required : Indifferent

Missions

Participate to the development of the experimental laboratory in fracture mechanics, production of experimental data and analysis of these experimental data in the context of the ERC HOPE.

Activities

• Development of a new experimental system to measure the velocity of the rupture front during the failure of intact specimens of Plexiglas in triaxial loading conditions. The development of such experimental system requires strong notions in electronic devices.
• Deformation experiments in triaxial loading conditions on rock analogs (plexiglass), coupling measurements of strain gages and acoustic emissions. Experiments will be conducted at different conditions of pressure and temperature, to study the influence of the visco-elastic transition of the plexiglass on the dynamics of the rupture front.
• Treatment of the experimental data, inversion of the localization of the acoustic emissions, and inversion of the position of the rupture front during the experiments.
• Analysesof the experimental results in the framework of the linear elastic fracture mechanics. These analyses will consist in the development of new theoretical and numerical tools.
• Writing of scientific papers about the experimental results and the theoretical development made during the two years of contract.

Skills

• Strong knowledge in experimental methods, particularly in using triaxial oil medium apparatus at high confining pressure. This knowledge is mandatory to apply to the position for safety reasons.
• Programming knowledge in Matlab, python and Julia.
• Strong knowledge in linear elastic fracture mechanics and general continuum mechanics.
• Knowledge in the transition from brittle to ductile processes.
• Knowledge in strain gages measurements and acoustic monitoring.

Work Context

The successful candidate will work at the Géoazur UMR7329 laboratory at the Valbonne site (06). The Géoazur laboratory is a multidisciplinary research unit composed of geophysicists, geologists, and astronomers federating around major scientific issues: the terrestrial hazards (seismic, gravity and tsunamigenic) and the associated risks, the dynamics of the lithosphere and the imagery of the Earth, the geodesy-metrology of the Earth and the near Universe.
It comprises about 170 people (researchers, research teachers, engineers, PhD students, etc.).
It is spread over two sites: the Azur CNRS campus in Valbonne Sophia Antipolis and the Calern – Caussols site of the Côte d'Azur Observatory.

The successful candidate will join the laboratory's earthquake team, and will work under the responsibility of François Passelègue, CNRS researcher at the laboratory. The work will be done in collaboration with Julien Ambre, Laboratory Engineering Engineer, Daniel Bonamy (Research Director at CEA Saclay) and Harsha Bhat (CNRS Researcher at ENS Paris).
The successful candidate will work on the ERC HOPE project. The aim of this project is to try to answer the following question: How predictable are earthquakes? At the heart of this project is the development of a new experimental device dedicated to generate multiple seismic cycles along a fault with prescribed complex geometry and rheology.

Constraints and risks

The experiments in the laboratory will be carried out on a high pressure triaxial press. Experience on this type of device during the thesis or a post-doc is mandatory to apply to the position.

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