# Snap-fit contact snagging problem

**URL:** <https://calculix.discourse.group/t/snap-fit-contact-snagging-problem/2277>\
**Category:** Analysis issues\
**Created:** [May 16, 2024, 2:49pm UTC](https://calculix.discourse.group/t/snap-fit-contact-snagging-problem/2277 "2024-05-16T14:49:09Z")\
**Posts on this page:** 4\
**Page:** 5

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**Author:** ![Calc\_em](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@Calc\_em](https://calculix.discourse.group/u/Calc_em)\
**Post date:** [May 21, 2024, 8:45pm UTC](https://calculix.discourse.group/t/snap-fit-contact-snagging-problem/2277/82 "2024-05-21T20:45:45Z")

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No problem, what I meant is that nowadays general contact can handle lots of configurations, including various contact conditions with edges and 1D elements (even one beam profile inside the other), by default. There is a way to use contact pairs for cases with tricky edge to surface interactions but CalculiX seems fo have a really big problem with that. I still hope there is a workaround though so I keep trying (to no avail for now).

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**Author:** ![xyont](https://yyz2.discourse-cdn.com/free1/user_avatar/calculix.discourse.group/xyont/32/3553_2.png) [@xyont](https://calculix.discourse.group/u/xyont)\
**Post date:** [May 22, 2024, 6:46am UTC](https://calculix.discourse.group/t/snap-fit-contact-snagging-problem/2277/83 "2024-05-22T06:46:24Z")

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reaction force at left support of model with rigid block,

 ![2024-05-22 13_28_17-Plot](https://global.discourse-cdn.com/free1/uploads/calculix/original/2X/0/05ebbf0fb2eaaa0e164f334e33bf77166066dcfa.png)

 ![2024-05-22 13_36_40-Source](https://global.discourse-cdn.com/free1/uploads/calculix/original/2X/4/4b4d8f27d6b381b1aa068a66678576dd90207a8c.png)

this analysis case is generally easy to convergence and done in CalculiX, not as in the case of metal forming ([thread](https://calculix.discourse.group/t/calculix-for-deep-drawing-analysis/2199)) i tested.

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<div class="post-metadata">

**Author:** ![Calc\_em](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@Calc\_em](https://calculix.discourse.group/u/Calc_em)\
**Post date:** [May 25, 2024, 4:11pm UTC](https://calculix.discourse.group/t/snap-fit-contact-snagging-problem/2277/84 "2024-05-25T16:11:50Z")

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With a few more fillets and many trials, I’ve finally got this to work:

[![](https://global.discourse-cdn.com/free1/uploads/calculix/original/2X/4/4d73c0dc840f8da19d6b390656d642a7cd002eab.jpeg "PrePoMax (CalculiX FEA) - Tutorial 43 - Snap-fit") ](https://www.youtube.com/watch?v=IsSsUDkVlpM)

Thank you all again for your help.

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**Author:** ![User1](https://yyz2.discourse-cdn.com/free1/user_avatar/calculix.discourse.group/user1/32/3909_2.png) [@User1](https://calculix.discourse.group/u/User1)\
**Post date:** [December 29, 2025, 6:15am UTC](https://calculix.discourse.group/t/snap-fit-contact-snagging-problem/2277/85 "2025-12-29T06:15:05Z")

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Hello,

I was able to get rid of snagging with a slight modification of master block mesh.

More details here : [Calculix Simulation with Salome for Mesh Handling | Anirudh Nehra posted on the topic | LinkedIn](https://www.linkedin.com/posts/anirudh-nehra-363a0a48_calculix-salomemeca-codeaster-ugcPost-7410357655384551424-07Cq)

[![](https://global.discourse-cdn.com/free1/uploads/calculix/original/2X/a/a0a4c896a1ca07e35ba134c13e9c3123c4fb5e98.jpeg "calculix snapfit") ](https://www.youtube.com/watch?v=AVlj_8Y21uY)

Regards

Anirudh Nehra

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