NOUVEAU PROCEDE D'HYPER-DEFORMATIONS DE TUBES PAR TORSION

A new severe plastic deformation process is proposed that is suitable to deform cylindrical tubes to extremely large strains without changing their dimensions. High hydrostatic pressure is achieved by axial compression of a cylindrical mandrel placed into the tube. The tube is twisted by an externaltorque with the help of the friction force generated by the hydrostatic pressure. This new SPD technique seems to be very promising for future industrial applications. Mots clefs : Tres grandes deformations plastiques, Tubes, Torsion, Cisaillement simple, Al, Cu.