PhD defence of Joséphine Chatellier

Characterization and modeling of cold multi-pass drawing of thick sheet applied to naval structures

Joséphine Chatellier conducted her doctoral research in the CSM team under the supervision of Pierre-Olivier Bouchard and Christophe Pradille. She defends her PhD in Computational Mechanics and Materials specialty on Dec. 2nd, 2025 on:

Characterization and modeling of cold multi-pass drawing of thick sheet applied to naval structures

in front of the following jury:

Mrs Pascale BALLAND, Université Savoie Mont Blanc, Reviewer
Mr. Luc PENAZZI, IMT Mines Albi, Reviewer
Mrs Sandrine THUILLIER, Université Bretagne Sud
Mr. Bruno LEVIEIL, ENSTA Bretagne
Mr. Pierre-Olivier BOUCHARD, Mines Paris PSL, Cemef
Mr. Christophe PRADILLE, Mines Paris PSL, Cemef
Mr. Anthony EZANNO, DGA, Guest
Mr. Christophe KERISIT, Naval Group, Guest

Abstract:
Naval Group uses different cold plastic deformation processes to build submarine shell elements. Because of the elements size and the small number of sets, these building processes are little automated, multi passes and rely on worker expertise for defining the manufacturing tools and processes. Moreover, the mechanical state of the sheet is modified by these processes because of the residual stress and the hardening of the material. With this project, Naval Group wants specifically to deepen the knowledge of the cold multi-pass drawing process of steel thick sheet in order to :

– to clarify the impact of the process on the sheet (plastic strain, residual stress, mechanical behaviour after process)
– to create a tool to help the development of tools geometry and manufacturing processes.

Keywords: Drawing, thcik sheet, material behaviour, numerical modelling, naval structures