09/12/2021
Marie Skłodowska-Curie Actions

MSCA-COFUND-CLEAR-Doc - PhD Position #CD21-30 "Analysis of the mechanisms relating to tire / road wear in relation to the emissions of fine particles"

This job offer has expired


  • ORGANISATION/COMPANY
    Université Gustave Eiffel
  • RESEARCH FIELD
    ChemistryPhysical chemistry
    EngineeringCivil engineering
    EngineeringMechanical engineering
  • RESEARCHER PROFILE
    First Stage Researcher (R1)
  • APPLICATION DEADLINE
    21/03/2022 17:00 - Europe/Brussels
  • LOCATION
    France › Nantes
  • TYPE OF CONTRACT
    Temporary
  • JOB STATUS
    Full-time
  • HOURS PER WEEK
    35
  • OFFER STARTING DATE
    01/10/2022
  • EU RESEARCH FRAMEWORK PROGRAMME
    H2020 / Marie Skłodowska-Curie Actions COFUND
  • REFERENCE NUMBER
    101034248
  • MARIE CURIE GRANT AGREEMENT NUMBER
    101034248

OFFER DESCRIPTION

Maintaining a high level of skid resistance to ensure the safety of road users results in progressive wear of the tires and the road surface. The consequences of this wear are generally described in terms of changes in the texture of the road surface or in the coefficient of friction. However, wear also generates particles at the tire road interface. These particles, along with those from brake pads and discs, form the main source of so-called non-exhaust particles (PHE) (as opposed to exhaust particles). The PHEs emitted can have negative impacts on the natural environment and on people : they can be deposited on the ground and permeate both terrestrial and aquatic ecosystems located near roads; they can also disperse in the air and have an impact on human health, especially in urban areas where they constitute the major pollutant. There are several publications in the literature relating to the collection of PHEs emitted as well as their physicochemical characterization (shape, size distribution, chemical composition) . However, knowledge on the dynamics of particle emissions at the tire-road interface, on the weight of PHEs in the "cocktail" of particles emitted, as well as on the tribological mechanisms that govern their production remain fragmentary. This knowledge is useful for multiple actors involved in road transport, in particular tire manufacturers and road companies.

The aim of this thesis project is to study the influence of tire-road contact on the associated PHE emissions. The thesis lies at the crossroads between the tribological analysis of wear mechanisms and the study of the mechanisms of PHE emissions. The research proposed as part of the thesis will be carried out mainly in the laboratory. The results obtained in the laboratory will be validated when necessary by measurements carried out on the test track of the campus of Gustave Eiffel University in Nantes. The laboratory approach aims to characterize the "3rd body" formed at the tire-road interface. The concept of 3rd body, widely used in tribology, makes it possible to consider the materials released by the tire and the roadway and the evolution of their composition (for example by aggregation with other contaminants). Depending on its changing composition, the 3rd body can lubricate the surfaces in contact or be ejected.

Understanding the PHE circulation process at the tire-road interface is therefore at the heart of this thesis. The experiments will be conducted using a platform to perform tribological tests, in particular a “pin on disc” device. This device simulates the friction between an element of the tire tread (pin) and a road surface (disc). It makes it possible to control the contact conditions (loads, speeds, etc.) and to test different variables such as the texture of the road surface or the tire rubber. The device will be adapted to the framework of the thesis by isolating it from external sources of contamination by encapsulation. This will allow the collection and then characterization of relatively pure samples of PHE associated with various configurations of tire-road contact. A fine characterization (i.e. at the micrometric scale) of the collected PHEs will be carried out in relation to the surface condition (i.e. topography and microstructure) of the pin and the disc. The information obtained will relate to the shape, particle size distribution, density and chemical composition of the PHEs. They will be used in an attempt to establish a link between the wear and emission mechanisms. In addition, "external" PHEs - collected from the road, the tire or the brake pads - will be injected at the pin / disc interface. The objective is to understand how these particles take part in the mechanisms of wear and, therefore, their integration into the 3rd body as well as their own re-emission.

Finally, a modeling approach could be initiated. It will aim to calculate a number of particles generated and then emitted according to the properties of the materials in contact (moduli, hardness), their state of contamination, the texture of the road surface, etc. Theoretical values will be compared on the one hand with data from laboratory experiments and, on the other hand, with measurements on the track or from previous works. The extensive PHEs characterization will be performed in close cooperation with Laboratory of Materials of the Institute for General Mechanical Engineering at University of Applied Sciences (TH Köln).

More Information

Benefits

  • High-quality doctoral training rewarded by a PhD degree, delivered by Université Gustave Eiffel.
  • Access to cutting-edge infrastructures for research & innovation.
  • Appointment for a period of 36 months based on a salary of 2 700 € (gross salary per month).
  • Job contract under the French labour legislation in force, respecting health and safety, and social security: 35 hours per week contract, 25 days of annual leave per year.
  • International mobility will be mandatory.
  • An international environment supported by the adherence to the European Charter & Code.
  • Access to dedicated CLEAR-Doc trainings with a strong interdisciplinary focus, together with a Career development Plan.

Eligibility criteria

  • At the time of the deadline, applicants must be in possession or finalizing their Master’s degree or equivalent/postgraduate degree. At the time of recruitment, applicants must be in possession of their Master’s degree or equivalent/postgraduate degree which would formally entitle to embark on a doctorate.
  • At the time of the deadline, applicants must be in the first four years (full-time equivalent research experience) of their research career (career breaks excluded) and not yet been awarded a doctoral degree. Career breaks refer to periods of time where the candidate was not active in research, regardless of his/her employment status (sick leave, maternity leave etc). Short stays such as holidays and/or compulsory national service are not taken into account.

  • At the time of the deadline, applicants must not have resided or carried out their main activity (work, studies, etc.) in France for more than 12 months in the 3 years immediately prior to the call deadline.

  • Applicants must be available to start the programme on schedule (around 1st October 2022)

Selection process

Additional comments

  • At the time of the deadline, applicants must be in possession or finalizing their Master’s degree or equivalent/postgraduate degree.
  • At the time of recruitment, applicants must be in possession of their Master’s degree or equivalent/postgraduate degree which would formally entitle to embark on a doctorate.
  • Applicants in possession of their Master’s degree at the time of the 3rd call deadline must be in the first four years (full-time equivalent research experience) of their research career (career breaks excluded) and not yet been awarded a doctoral degree. Career breaks refer to periods of time where the candidate was not active in research, regardless of his/her employment status (sick leave, maternity leave etc). Short stays such as holidays and/or compulsory national service are not taken into account.
  • Applicants must fulfil the transnational mobility rule: applicants must not have resided or carried out their main activity (work, studies, etc.) in France for more than 12 months in the 3 years immediately prior to the call deadline.
  • Applicants must be available to start the programme on schedule (around 1st October 2022).

Web site for additional job details

Offer Requirements

  • REQUIRED EDUCATION LEVEL
    Engineering: Master Degree or equivalent
    Chemistry: Master Degree or equivalent
  • REQUIRED LANGUAGES
    ENGLISH: Good
    FRENCH: Basic

Skills/Qualifications

  • At the time of the deadline, applicants must be in possession or finalizing their Master’s degree or equivalent/postgraduate degree.
  • At the time of recruitment, applicants must be in possession of their Master’s degree or equivalent/postgraduate degree which would formally entitle to embark on a doctorate.

Specific Requirements

This thesis will be in cosupervision with TH Köln (Germany).

Work location(s)
1 position(s) available at
Université Gustave Eiffel
France
Nantes
44344
Allée des Ponts et Chaussées

EURAXESS offer ID: 717640

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