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--- team:carretta [2015/02/04 14:21] – carretta
+++ team:carretta [2024/03/01 16:07] (current) – boman
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-~~NOTOC~~
-{{    :team:photoyves.jpg?100|Yves}}
 ====== Yves CARRETTA ======
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 This page gives an overview of my research activities.
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 My goal is now to couple the FE software Metafor to the numerical rolling model [[#Cold-rolling software: MetaLub|MetaLub]] in order to take MPH lubrication effects in cold-rolling.
+** Keywords **
+[[wp>Cold rolling]], [[wp>Friction]], [[wp>Lubrication]], Mixed Lubrication, [[wp>Fluid-structure interaction]], [[http://metafor.ltas.ulg.ac.be/|Metafor]], [[wp>Finite Element Method]], Numerical Simulation, Slab Method.
 ===== Collaborations =====
   * **ArcelorMittal :** The purpose of the collaboration with ArcelorMittal is to improve the capabilities of the cold-rolling software [[#Cold-rolling software: MetaLub|MetaLub]]. Several papers has been published with Maxime Laugier and Nicolas Legrand from the R&D centre of Maizières-Lès-Metz (France).
-  * **CEMEF :** I performed thermal simulations with Romain Canivenc, a researcher from CEMEF. The thermal coupling procedure I implemented between MetaLub and ThermRoll (a code - developed at CEMEF - modeling temperature exchange between the rolls and the strip in the roll-bite) was used to study cold rolling test conditions encountered in an industrial rolling mill. This collaboration lead to a conference paper presented at Coupled2011 (see [[#Publications]]).
+  * **CEMEF :** I performed thermal simulations with Romain Canivenc, a researcher from CEMEF and his advisor [[http://www.cemef.mines-paristech.fr/staff/pierre-montmitonnet|Pierre Montmitonnet]]. The thermal coupling procedure I implemented between MetaLub and ThermRoll (a code - developed at CEMEF - modeling temperature exchange between the rolls and the strip in the roll-bite) was used to study cold rolling test conditions encountered in an industrial rolling mill. This collaboration lead to a conference paper presented at Coupled2011 (see [[#Publications]]).
-  * **Sheffield :** There is an ongoing collaboration with Professor Rob Dwyer-Joyce from the University of Sheffield ([[http://www.leonardocentre.co.uk/|Leonardo Tribology Centre]]). His team develops ultrasound techniques to measure lubricant film thickness between contacting solids. This system was used to perform measurements in the roll-bite of cold-rolling stands. A comparison between the fluid film thickness predicted by the numerical model [[#Cold-rolling software: MetaLub|MetaLub]] and experimental measurements is important to get a good understanding of the experiments and to validate MetaLub.
+  * **Sheffield :** There is an ongoing collaboration with Professor [[http://www.sheffield.ac.uk/mecheng/staff/rdwyerjoyce1|Rob Dwyer-Joyce]] from the University of Sheffield ([[http://www.leonardocentre.co.uk/|Leonardo Tribology Centre]]). His team develops ultrasound techniques to measure lubricant film thickness between contacting solids. Andy Hunter, a PhD student, used this system to perform measurements in the roll-bite of cold-rolling stands. A comparison between the fluid film thickness predicted by the numerical model [[#Cold-rolling software: MetaLub|MetaLub]] and experimental measurements is important to get a good understanding of the experiments and to validate MetaLub.
-  * **Valenciennes :** I collaborated with Cédric Hubert and André Dubois [[http://www.univ-valenciennes.fr/TEMPO/msm-overview|Materials, Surface and forming Lab.]] from the University of Valenciennes. Results obtained in plane strip drawing with Metafor were compared to exprimental measurements gathered by Cédric Hubert and numerical results computed with the FE commercial software Abaqus. This collaboration lead to a conference paper that will be presented at the ESAFORM conference in April 2015.
+  * **Valenciennes :** I collaborated with [[http://www.univ-valenciennes.fr/TEMPO/membres/hubert_cedric|Cédric Hubert]] and [[http://www.univ-valenciennes.fr/IDP/membres/dubois_andre|André Dubois]] [[http://www.univ-valenciennes.fr/TEMPO/msm-overview| from the University of Valenciennes]]. Results obtained in plane strip drawing with Metafor were compared to exprimental measurements gathered by Cédric Hubert and numerical results computed with the FE commercial software Abaqus. This collaboration lead to a conference paper that will be presented at the ESAFORM conference in April 2015.
 [[#Yves CARRETTA|Back to top]]
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 ===== Positions =====
-  * **2013 – now ** : Research Engineer at ULg (Project OPTILUB) “//Numerical Simulation of Micro-Plasto-Hydrodynamic lubrication in cold rolling//”.
+  * **2013 – now ** : Research Engineer at ULg (Project OPTILUB) “//Numerical Simulation of Micro-PlastoHydrodynamic lubrication in cold rolling//”.
   * **2009 – 2013** : PhD student (FRIA grant)
 ===== Education =====
-  * **2014 :** Ph.D. thesis at the University of Liège (Advisor: J.-P. Ponthot) \\ “//Finite element modelling of Micro-Plasto-Hydrodynamic lubrication in order to take this phenomenon into account in a cold rolling model//”. (In French)
+  * **2014 :** Ph.D. thesis at the University of Liège ([[http://www.ulg.ac.be/cms/j_5871/repertoires?uid=U026455|Advisor: J.-P. Ponthot]]) \\ “//Finite element modelling of Micro-Plasto-Hydrodynamic lubrication in order to take this phenomenon into account in a cold rolling model//”.
   * **2009 :** Degree in Mechanical Engineering at the University of Liège \\ Master thesis: “//Numerical modelling of the creep forming process. Application to aeronautical wing panels//”. (In French)
-===== Contact information =====
+===== Numerical modeling of MPH lubrication =====
-  Phone  : +32 - (0)4/366.91.49
-  e-mail : Y.Carretta@ulg.ac.be
-  mail   : Institut de Mécanique B52/3
-           Chemin des Chevreuils, 1
-           Office: +2/540
-           B-4000 Liège, BELGIUM
-[[#Yves CARRETTA|Back to top]]
-===== Keywords =====
-[[wp>Cold rolling]], [[wp>Friction]], [[wp>Lubrication]], Mixed Lubrication, [[wp>Fluid-structure interaction]], [[http://metafor.ltas.ulg.ac.be/|Metafor]], [[wp>Finite Element Method]], Numerical Simulation, Slab Method.
-==== Numerical modeling of MPH lubrication ====
 The experimental setup used by Bech to highlight MPH lubrication is depicted below. It is made of a transparent upper tool and a steel lower tool having a small angle  $\alpha$  respective to the horizontal axis ( $\alpha$  being either 2°, 3° or 5° depending on the tests). Using a camera, Bech was able to observe and record lubricant outflow from cavities. In the various conditions he tested, Bech observed backward and/or forward lubricant escapes.
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 ** FE simulations results computed with Metafor **
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 [[#Yves CARRETTA|Back to top]]
-==== Fluid simulations ====
+===== Fluid simulations =====
-MPH lubrication requires to take into account fluid and solid at the same time in the simulation. To assess Metafor's ability to deal with fluid simulation. I modelled fluid flows on test cases of increasing complexity such as the square cavity and Rayleigh's step (see pictures below). To perform these simulations, I implemented a new material law in order to model the behaviour of Newtonian fluids and I took advantage of the Arbitrary Lagrangian Eulerian formalism - allowing to uncouple the motion material's motion from the mesh - which was already implemented in Metafor. The comparison between Metafor results and reference solutions show a good agreement between these results.
+MPH lubrication requires to take into account fluid and solid at the same time in the simulation. To assess Metafor's ability to deal with fluid simulation. I modelled fluid flows on test cases of increasing complexity such as the square cavity and Rayleigh's step (see pictures below). To perform these simulations, I implemented a new material law in order to model the behaviour of Newtonian fluids and I took advantage of the Arbitrary Lagrangian Eulerian formalism - allowing to uncouple the motion material's motion from the mesh - which was already implemented in Metafor (see [[https://sites.google.com/site/romainboman/|Romain Boman]] for the current implementation). The comparison between Metafor results and reference solutions show a good agreement between these results.
 {{ :team:fluidvalidity_figweb_v2.png?800 |}}
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 [[#Yves CARRETTA|Back to top]]
-==== Fluid-structure interaction simulations ====
+===== Fluid-structure interaction simulations =====
 Since fluid-structure interaction simulations were required, I assessed Metafor's validity by studying a benchmark where a flexible beam bends due to the fluid flow around it. The video below shows large displacement of the beam and its impact on fluid velocity.
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 [[#Yves CARRETTA|Back to top]]
-==== Cold-rolling software: MetaLub ====
+===== Cold-rolling software: MetaLub =====
 MetaLub is a cold-rolling model taking into account mixed lubrication regime. The main objective is to enhance
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 but also roll diameters and roughness, etc. can be optimized to improve stability and efficiency of the rolling tool.
-The first version of this algorithm was implemented, in Fortran, by Nicolas Marsault at CEMEF. It was then  optimized and implemented in C language by Romain Boman during is PhD at the University of Liège. Then, Antoine Stephany - another PhD-student - added new features such as roll-bite starvation (the amount of oil in the roll-bite is specified by the software user), large deformations of the work rolls, new lubricant rheology laws, etc.
+The first version of this algorithm was implemented, in Fortran, by Nicolas Marsault at CEMEF. It was then  optimized and implemented in C language by [[https://sites.google.com/site/romainboman/|Romain Boman]] during is PhD at the University of Liège. Then, Antoine Stephany - another PhD-student - added new features such as roll-bite starvation (the amount of oil in the roll-bite is specified by the software user), large deformations of the work rolls, new lubricant rheology laws, etc.
 I changed the structure of the code by means of C++ language. Thanks to the new object oriented structure, features addition are more straightforward and code modifications are more localised. It allowed me to adapt the set of equations when I implemented the coupling procedure involving MetaLub and Metafor.
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 ===== Publications =====
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