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Reference : UMR7057-CARPHI-011
Workplace : PARIS 13
Date of publication : Tuesday, May 04, 2021
Type of Contract : FTC Scientist
Contract Period : 6 months
Expected date of employment : 1 July 2021
Proportion of work : Full time
Remuneration : Gross salary CNRS 2730 euros approx.
Desired level of education : PhD
Experience required : 1 to 4 years
Extrusion is a key step in the processing of polymer melts involved in the design of rubber materials, specifically for tyre applications. Formulations of tyre tread materials are currently undergoing a major evolution to reduce rolling resistance. However, certain formulations lead to the appearance of surface defects under extrusion that are not acceptable for industrial applications. Recent studies have revealed that rubber may undergo elastic instabilities during the flows involved in the processes leading to such defects. One way to secure the extrusion step is to better understand the fundamental mechanisms linking the flow process to the material response.
The goal of this post-doctoral fellowship is to quantitatively characterize these flow instabilities in a non-invasive manner using an ultrasonic velocimetry technique. The first step will be to set up the experimental device on a laboratory extruder and then to characterize locally the rubber flow field during the extrusion process. This device will enable us to identify the most sensitive materials according to their formulation and as a function of the applied mechanical stresses.
Profile and expertise: junior researcher with less than 2 years post-doctoral experience with skills in the following areas: polymeric materials, fluid mechanics, rheology, instrumentation.
Laboratoire Matière et Systèmes Complexes (University of Paris/CNRS),
Constraints and risks
This study will be carried out in the framework of a collaboration between Sébastien Manneville from the Physics Laboratory of the ENS in Lyon, Sandra Lerouge from the Laboratoire Matière et Systèmes Complexes of the University of Paris and the MFPM on the Ladoux R&D site. This 6-month post-doctoral fellowship will take place mainly on the Michelin Ladoux site in Clermont-Ferrand.
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