Heinrich, Alban (2003) Modélisation thermomécanique de la coulée continue d'acier en deux dimensions. PhD thesis Sciences et Génie des Matériaux, ENSMP - CEMEF Centre de Mise en Forme des Matériaux, ENSMP.
Abstract
In this work, we introduce a thermo-mechanical model of the steel continuous casting process, in two dimensions. With our approach, it is possible to obtain thermo-mechanical steady-state solution of the process, for the whole product. The thermo-mechanical history of the product can thus be deduced, by viewing the stress and temperature fields, for instance. One of the expected results deals with the bulging between rolls, which is known to give birth to segregation phenomena.
We base our study on the global non steady-state strategy using a Lagrangian approach. The flow of matter in the studied domain is simulated through one injection tool located in the upper face of the domain. The lower face is supposed to be driven down at the starting block velocity. Thus the matter is led throughout the CC machine.
Concerning the model, non-steady thermo-mechanical conservation equations are solved. The thermal problem is for the enthalpy variable. The approach to the mechanical problem is of monophasic type (velocity and pressure are the unknows). In our approach, natural convection and macrosegregation are neglected. Solid, mushy and liquid states obey respectively to elasto-viscoplastic, viscoplastic and Newtonian behaviours. The rheology of the solid state is calculated thanks laws from the litterature. The liquid and mushy states are modelled with high consistencies so that natural convection may be neglected.
These developments have been validated on industrial cases, showing a good qualitative and quantitative agreement.
| Item Type: | PhD Thesis (PhD) |
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| Thesis Supervisor: | Bellet, Michel |
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| Date: | October 2003 |
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| Board of examiners: | Habraken, Anne-Marie and Potier-ferry, Michel and Bobadilla, Manuel and Lesoult, Gérard |
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| Discipline: | Sciences et Génie des Matériaux |
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| Collection (Fonds): | ENSMP |
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| Institution: | ENSMP |
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| Department: | ENSMP - CEMEF Centre de Mise en Forme des Matériaux |
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| Subjects: | 4. Materials Science, Mechanics and Mechanical Engineering |
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| Uncontrolled Keywords: | Steel, Continuous casting, Rheology, Finite elements, Lagrangian, Thermo-mechanical coupling, Viscoplastic, Elasto-viscoplastique, Newtonian, Coulée continue, Acier, Rhéologie, Modélisation élément finis, Lagrangien, Couplage thermo-mécanique, Viscoplastique, élasto-viscoplastique, Newtonien |
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