# Tie-constrain is not applying

**URL:** <https://prepomax.discourse.group/t/tie-constrain-is-not-applying/3689>\
**Category:** Tips & Tricks\
**Created:** [September 23, 2026, 10:10am UTC](https://prepomax.discourse.group/t/tie-constrain-is-not-applying/3689 "2026-09-23T10:10:59Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![JJJ](https://avatars.discourse-cdn.com/v4/letter/j/839c29/32.png) [@JJJ](https://prepomax.discourse.group/u/JJJ)\
**Post date:** [September 23, 2026, 10:10am UTC](https://prepomax.discourse.group/t/tie-constrain-is-not-applying/3689/1 "2026-09-23T10:10:59Z")

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Hi all,

I have a model where it seems that tie-constrain is not applying properly )after calculation, I get excesive displacements=. Is it possible to define tie-constraint between a surface and the edge of another surface, being both surfaces perpendiculars? Thank you.

 ![image](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/d/d72a2554a40468e21f2f639fbd1d82c185a6e8cf.png)

Thank you for your time.

JJJ

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**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\
**Post date:** [September 23, 2026, 10:17am UTC](https://prepomax.discourse.group/t/tie-constrain-is-not-applying/3689/2 "2026-09-23T10:17:00Z")

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You may need to increase the Position tolerance or use Tied contact instead. Tie constraints may not always work well with shells and other 2D elements. For example: [Tie constraint on the edges of 2D elements - Analysis issues - CalculiX (official versions are on www.calculix.de, the official GitHub repository is at https://github.com/Dhondtguido/CalculiX).](https://calculix.discourse.group/t/tie-constraint-on-the-edges-of-2d-elements/2855)

If this doesn’t help, please share the .pmx file.

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<div class="post-metadata">

**Author:** ![JJJ](https://avatars.discourse-cdn.com/v4/letter/j/839c29/32.png) [@JJJ](https://prepomax.discourse.group/u/JJJ)\
**Post date:** [September 24, 2026, 9:26pm UTC](https://prepomax.discourse.group/t/tie-constrain-is-not-applying/3689/3 "2026-09-24T21:26:16Z")

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Thank you @FEAnalyst what you recomended finally worked 🙂