External curling process of thin tubes: finite element and experimental investigation

  • Mouna Masmoudi
  • Hajer Ketata
  • Abdelkader Krichen


In this paper, numerical and experimental analyses of external curling of thin-walled round tubes are presented. An elasto-plastic finite element model was used for simulating the process over a conical die with fillet. A commercial tube of copper with a thickness of 0.7 mm was selected for this work. The friction present at the contact interfaces between the tube and the die during curling operation is examined to suggest a success of the forming mode of deformation. The investigation is focused mainly on understanding the modes of deformation which may encounter during the axial compression until achieving the double-walled tube to establish the forming kinematics and the typical deformed shape at each mode. The numerical results show that the whole process went through eight forming stages and demonstrate accuracy of the final deformed shape for each of them. The experimental results confirmed that compared with the finite element simulations, the current model provides an accurate prediction on the forming kinematics and the deformed shape.


External curling Thin metal tube Finite elements Deformed shape Forming kinematics 


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Copyright information

© Springer-Verlag London 2016

Authors and Affiliations

  • Mouna Masmoudi
    • 1
  • Hajer Ketata
    • 2
  • Abdelkader Krichen
    • 1
  1. 1.LGPMM, National Engineering School of SfaxUniversity of SfaxSfaxTunisia
  2. 2.LASEM, National Engineering School of SfaxUniversity of SfaxSfaxTunisia

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