Numerical Simulation of Tube Bending Supported by Hydraulic Pressure for Manufacturing Butt-Welding Fittings

Josef Domitner*, Peter Auer, Christof Sommitsch

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference paperpeer-review


An innovative tube bending process supported by hydraulic pressure was patented in 1995. This process was designed for producing butt-welding fittings which particularly fulfil the dimensional specifications of the ASME B16.9, MSS SP-75, and MSS SP-43 standards. Since the patent has meanwhile expired, the bending process is now available for common use. This work presents a novel finite element (FE) model build using the software package LS-DYNA, which enables determining the process window for bending defect-free butt-welding fittings. This model was exemplarily applied for investigating the bending process of a 90° stainless steel elbow based on a straight tube of nominal pipe size (NPS) 6. Comparing the calculated geometry of the elbow with the actual geometry of an industrially produced elbow revealed very good dimensional agreement. This confirms that the presented model can be utilized for determining suitable process conditions, which allow for producing defect-free components.
Original languageEnglish
Title of host publicationForming the Future
Subtitle of host publicationProceedings of the 13th International Conference on the Technology of Plasticity
EditorsGlenn Daehn, Jian Cao, Brad Kinsey, Erman Tekkaya, Anupam Vivek, Yoshinori Yoshida
PublisherThe Minerals, Metals & Materials Society (TMS)
Number of pages11
ISBN (Electronic)978-3-030-75381-8
ISBN (Print)978-3-030-75380-1
Publication statusPublished - 2021
Event13th International Conference on the Technology of Plasticity: ICTP 2021 - Virtual Conference, Virtual Conference
Duration: 25 Jul 202130 Jul 2021

Publication series

NameMinerals, Metals and Materials Series
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696


Conference13th International Conference on the Technology of Plasticity
Abbreviated titleICTP 2021
CityVirtual Conference


  • Buckling
  • Butt-welding fitting
  • Finite element simulation
  • Hydraulic pressure
  • Hydroforming
  • Piping system
  • Stainless steel pipe
  • Tube bending
  • Tube forming

ASJC Scopus subject areas

  • Mechanics of Materials
  • Metals and Alloys

Fields of Expertise

  • Mobility & Production


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