Dynamic neck development in a polymer tube under internal pressure loading

Britta Lindgreen, Viggo Tvergaard, Alan Needleman

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The initiation and growth of necks in polymer tubes subjected to rapidly increasing internal pressure is analyzed numerically. Plane strain conditions are assumed to prevail in the axial direction. The polymer is characterized by a finite strain elastic-viscoplastic constitutive relation and the calculations are carried out using a dynamic finite element program. Numerical results for neck development are illustrated and discussed for tubes of various thicknesses. The sensitivity to the wave number of the thickness imperfections is studied with a focus on comparing a long wave length imperfection and a short wave length imperfection. After some thinning down at the necks, the mode of deformation switches to neck propagation along the circumference of the tube. A case is shown in which the necks have propagated along the entire tube wall, so that network locking in the polymer results in high stiffness against further expansion of the tube. The rate dependence of the necking behavior gives noticeable differences in neck development for slow loading versus fast loading.
Original languageEnglish
JournalInternational Journal of Solids and Structures
Volume45
Issue number2
Pages (from-to)580-592
ISSN0020-7683
DOIs
Publication statusPublished - 2008

Keywords

  • dynamic loading
  • neck propagation
  • finite strain
  • polymer tubes

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