On the tube hydroforming process using rectangular, trapezoidal, and trapezoid-sectional dies: modeling and experiments

  • Abir Abdelkefi
  • Pierrick Malécot
  • Nathalie Boudeau
  • Noamen Guermazi
  • Nader Haddar
ORIGINAL ARTICLE
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Abstract

It is generally known that the contact between tube and die, in the case of tube hydroforming process, leads to the appearance of friction effects. In this context, there are many different models for representing friction and many different tests to evaluate it. In the present paper, the pin-on-disk test has been used and the theoretical model of Orban-2007 has been chosen and developed to evaluate friction coefficient. The main goal is to prove the capacity of theoretical model to present the friction conditions in comparison with the pin-on-disk test. From the Orban model, values of 0.05 and 0.25 of friction coefficient have been found under lubricated and dry tests, respectively. On the other hand, by the classical pin-on-disk test, other values were experimentally obtained as friction coefficient at the copper/steel interface. In the case of pure expansion hydroforming, based on an internal pressure loading only, a “corner filling” test has been run for tube hydroforming. Both dry and lubricated contacts have been considered. Various configurations and shapes have been studied such as the rectangular, trapezoidal, and trapezoid-sectional dies. Finite element simulations with 3D shell and 3D solid models have been performed with different values of friction coefficients. From the main results, it was found that the critical thinning occurs in the transition zone for the square and rectangular section die and in the sharp angle for the trapezoidal and trapezoid-sectional die. The comparison between numerical data and experimental results shows a good agreement. Moreover, the thickness distribution along the cross section is relatively consistent with those measured for the 3D shell model; however, the 3D solid models do not provide a realistic representation of the thickness distribution in the shaped tube. Finally, the results obtained from the theoretical model were more efficient than the results obtained from the pin-on-disk test.

Keywords

Tube hydroforming FE simulation Friction coefficient Thickness distribution Lubrication 

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Copyright information

© Springer-Verlag London Ltd. 2017

Authors and Affiliations

  • Abir Abdelkefi
    • 1
    • 2
  • Pierrick Malécot
    • 2
    • 3
  • Nathalie Boudeau
    • 2
    • 3
  • Noamen Guermazi
    • 1
    • 4
  • Nader Haddar
    • 1
  1. 1.Laboratoire de Génie des Matériaux et Environnement (LGME), ENISUniversité de SfaxSfaxTunisia
  2. 2.Institut FEMTO-ST UMR6174, ENSMM, CNRSUniv. Bourgogne Franche ComtéBesançonFrance
  3. 3.ENSMMBesançon CedexFrance
  4. 4.Institut Supérieur des Sciences Appliquées et de Technologie de KasserineUniversité de KairouanKasserineTunisia

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