# Axisymmetric torsion of a bar

**URL:** <https://fenicsproject.discourse.group/t/axisymmetric-torsion-of-a-bar/14370>\
**Category:** General\
**Tags:** dolfinx\
**Created:** [April 22, 2024, 10:24am UTC](https://fenicsproject.discourse.group/t/axisymmetric-torsion-of-a-bar/14370 "2024-04-22T10:24:33Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![jkrokowski](https://avatars.discourse-cdn.com/v4/letter/j/0ea827/32.png) [@jkrokowski](https://fenicsproject.discourse.group/u/jkrokowski)\
**Post date:** [April 22, 2024, 4:36pm UTC](https://fenicsproject.discourse.group/t/axisymmetric-torsion-of-a-bar/14370/2 "2024-04-22T16:36:49Z")

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You can use a 1D torsional model if you compute a “torsional constant” following [this link](https://fenicsproject.discourse.group/t/how-to-add-torsion-to-a-beam-problem/1681/5). The 1D torsional model is quite simple (only a function of rotation of the cross section).

Additionally, a 3D implementation exists here at [this link](https://fenicsproject.discourse.group/t/equivalent-for-expression-in-dolfinx/2641/25)

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