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Numerical modeling of adhesive wear in elastic-plastic contacts (H/F)

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

Date Limite Candidature : jeudi 23 septembre 2021

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General information

Reference : UMR7649-STEBRA-001
Workplace : PALAISEAU
Date of publication : Thursday, September 2, 2021
Scientific Responsible name : Stella Brach
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 January 2022
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

We invite applications for a PhD position in numerical modelling of elastic-plastic contacts. The thesis will focus on the development of discrete and continuum models for the simulation of adhesive wear in asperity junctions. The thesis is embedded into the project SINFONIA, funded by the National Research Agency. The position is available starting from January 2022 and open until fulfilment.

Context. Wear is ubiquitous in any mechanical system that experiences relative motion of its components. Wherever two solid surfaces slide or roll against each other, frictional resistance arises and results in the occurrence of wear. The amount and rate of material loss is a key factor for determining the safety and lifespan of many systems and devices, ranging from machinery parts for engineering applications to medical implants and prostheses. The unwanted occurrence of wear also comes with a high ecological impact, as the non-disposable chemicals used to lubricate are often discarded into the environment. This thesis will contribute to understand how those phenomena originate, with the aim to promote both scientific advancement and technological development.

Job description. As a successful candidate, you will develop numerical models to investigate elastic-plastic adhesive wear. This includes both discrete (e.g., Molecular Dynamics) and continuum (variational phase field) approaches. You will implement your models in high performance computing software and assess performance, accuracy and robustness in systems involving single and multi-asperity contacts. The resulting software will be used to conduct high-fidelity numerical simulations. Our purpose will be two-fold:
• Understanding the relationship among material microstructure, surface morphology and wear.
• Using this understanding to design rough contacts with targeted wear behavior.
Your work will benefit of the experimental activities of the group (3D-printing, laser texturing).

Your profile
• MSc in mechanical or computational engineering, mechanics of materials and structures, applied mathematics.
• Programming experience (Python, Fenics, Fortran). HPC experience is an advantage.
• Sound knowledge of the English language is expected.

Application Interested candidates should contact both Stella Brach (stella.brach@polytechnique.edu) and Djimedo
Kondo (djimedo.kondo@sorbonne-universite.fr) with the following documents: (i) cover letter, (ii) curriculum vitae
with academic record for the past three years, (iii) contact details of an academic reference

Work Context

This is a shared position between the Laboratoire de Mécanique des Solides (LMS, École Polytechnique) and the Institut Jean le Rond d'Alembert (IJLRA, Sorbonne Université). You will be under the joint supervision of Stella Brach, CR CNRS at LMS, and Prof. Djimedo Kondo (IJLRA).

Constraints and risks

none

Additional Information

none

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