Numerical investigation of Micro-Plasto Hydrodynamic lubrication in cold rolling with a third generation tribology-lubrication model

Description de l'offre

Country:

FRANCE

Region:

LORRAINE

Sector:

ArcelorMittal Europe - Flat Carbon

Unit:

ARCELOR RESEARCH

Site:

ArcelorMittal RESEARCH Maizieres

Field of activity:

Research and Development / Metallurgy Innovation

Title of internship:

Numerical investigation of Micro-Plasto Hydrodynamic lubrication in cold rolling with a third generation tribology-lubrication model

Subject of the internship:

During cold rolling, friction control between the strip and the work-rolls is essential to draw the strip into the roll bite and properly transmit force to plastically deform the strip. Proper friction enables the strip thickness to be efficiently and economically reduced with high product dimensional accuracy and excellent surface functionality. To understand tribological behavior inside the rollbite, numerical simulations with advanced models accounting for different physical-chemical mechanisms are required. The objective of this internship is to study numerically different tribological phenomena, especially the Micro-Plasto Hydrodynamic (MPH), occurring inside the roll bite to understand the influence of process’ parameters on the resulting friction behavior, by using an advanced tribology-cold rolling model: Metalub. This code is the result of three PhD theses and one postdoctoral research project from the collaboration between ArcelorMittal Global R&D and academic partners, which is in the phase of integration at ArcelorMittal. Results of the internship are expected to enable demonstrating the robustness of the program and also improving it. To reach this objective, an important work on model improvement will also be performed. The detailed missions are: 1. Literature review and mastering the coupled semi-analytical – FEM Metalub-Metafor model (ArcelorMittal Maizières Research, University of Liège) 2. Parametric study to understand influence of numerical parameters (relaxation coefficient, penetration tolerance, etc.) on numerical results. 3. Investigation the occurrence of MPH lubrication in starvation domain. 4. Improvement of the numerical model to have a more reliable program allowing describing all identified tribological mechanisms in roll bite (e.g., hydrodynamic effect, MPH). 5. Performing comparisons with existing experimental results from laboratory cold rolling mill and industrial data. 6. Investigation of the feasibility to develop a coupled (semi-)analytical dynamic concentration model with Metalub-Metafor. 7. Proposing the next step action plan to improve the numerical models. This internship will be carried out in the Downstream Process (DP) department of Process center at Maizières-lès-Metz, France. Inside the DP department, the student will work in an international environment involving around thirty five specialists, R&D engineers and technicians.

Profil recherché

Applicant Profile:

- Mechanical engineer student. - Strong background in mathematics, continuum mechanics and tribology. - Very good knowledge in scientific programming (C++, python). - Autonomy and team-working. - A good English level is required and French is recomm

Education:

Mechanical engineering / computational mechanics

Level of education:

MASTER (Bac+4/5)

Language:

English: Advanced - French: Intermidiate

Duration of the internship:

6 months

Period of the internship:

April 2016

Managers of the internship:

Negar GILANI
Tel:
Email: ************@*******.**

Comments:

To apply please contact : Son CAO ************@*******.**

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