Missions

At the CNRS Futuroscope site, the Pprime Institute, as part of a collaborative project with SAFRAN, is recruiting a researcher to characterise the damage mechanisms and the loss of stiffness of 3D woven composites under cyclic loading coupled with an oxidising atmosphere in terms of temperature, and then, in a second phase, in a damp and oxidising environment.
Tests stopped by tomographic analyses are needed to describe the damage scenario and assess the material health of the structure during fatigue tests. The criticality of coupling phenomena in different environmental conditions (oxidative, humidity) will therefore be characterised.

Activités

The main objectives are as follows:
1. To propose an experimental methodology for characterising the mechanical behaviour of 3D woven carbon composite structures, highlighting the impact of thermo-oxidation with respect to exposure conditions (time, humidity, temperature, oxygen pressure) coupled with mechanical stresses;
2. Determine the criticality of the various couplings that can occur on parts in service, and analyse the damage mechanisms in each case (temperature, O2, with or without the presence of moisture);
3. Criticise the accelerated ageing methods currently used by studying the impact of mechanical stresses in conjunction with the chemical degradation that can occur during the life cycle of the part, and propose initial avenues for numerical analysis.

Compétences

The candidate must have the following skills:
-Knowledge of composite materials,
-Damage mechanisms and behaviour laws,
-Practical experience of thermo-mechanical testing

Contexte de travail

The P' Institute is a research laboratory in the fields of Physical Sciences and Engineering Sciences. Its activities cover a wide range of complementary themes and skills, from the physics of materials to the mechanics of fluids and materials, mechanical engineering and energy.
The ENDO team focuses on the mechanics of materials and structures, particularly in the fields of transport - mainly aeronautics - and energy.
The methodology used to approach these scientific subjects is based on the following sequence: representative tests - microstructural analysis - formulation of hypotheses/behavioural laws - identification - numerical simulation - return to tests.

Le poste se situe dans un secteur relevant de la protection du potentiel scientifique et technique (PPST), et nécessite donc, conformément à la réglementation, que votre arrivée soit autorisée par l'autorité compétente du MESR.

Contraintes et risques

Short-term travel in France and abroad is to be expected.