129 - Coupling of rolling and buckling models for the prediction of flatness after cold rolling

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Reference Offre 129

The accurate prediction of flatness defects after cold rolling of flat steel sheets is a challenging modeling problem involving the prediction of instabilities at the exit of the mill. Finite element models used industrially for cold rolling only allow to predict the effect of process parameters on residual stresses in the strip (latent flatness). The prediction of actual visible defects requires the use of a second model, uncoupled from the rolling model, to simulate buckling of the strip under these residual stresses.

In a recent collaboration between ArcelorMittal and LEM3, a MATLAB prototype coupled rolling and buckling model was developed to better estimate the interactions between rolling in the roll bite and buckling at the exit of the stand.

The objectives of the master include:
* Familiarization with ArcelorMittal FEM rolling model and LEM3 MATLAB coupled model
* Parametric studies using the MATLAB model:
- effect of roll shape and other rolling parameters
- effect of numerical parameters (contact penalty, element size, projection methods, type of elements for the buckling)
* Comparison of residual stresses after the rolling phase, obtained by ArcelorMittal FEM Model and LEM3 MATLAB model

Locations:

The trainee will be contractually attached to ArcelorMittal Maizières R&D but the internship will be hosted both in LEM3 Lab in Metz and in ArcelorMittal R&D center in Maizières les Metz.

Level of Study: Bac+5 / Master
Domain: Mechanics / Physics
Modeling / Simulation
Skills: Solid Mechanics, Numerical Modelling, Finite Element Method
Languages: English, French