# Contact problem with overlapping mesh results

**URL:** <https://calculix.discourse.group/t/contact-problem-with-overlapping-mesh-results/1105>\
**Category:** Uncategorized\
**Created:** [May 19, 2022, 10:33am UTC](https://calculix.discourse.group/t/contact-problem-with-overlapping-mesh-results/1105 "2022-05-19T10:33:00Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![caeplayer](https://avatars.discourse-cdn.com/v4/letter/c/3d9bf3/32.png) [@caeplayer](https://calculix.discourse.group/u/caeplayer)\
**Post date:** [May 19, 2022, 10:33am UTC](https://calculix.discourse.group/t/contact-problem-with-overlapping-mesh-results/1105/1 "2022-05-19T10:33:00Z")

</div>

Hello calculix’s masters!  
Does anyone know how to solve the overlapping mesh problem of pair contact region while this 3D object moving (inserting) into another such as below photo(black & red )?  
Although the process of this calculation is success, it seems to be something wrong in this results.

 ![3D](https://global.discourse-cdn.com/free1/uploads/calculix/original/1X/8c0a63568b65dddd9d9db511d29f157ae0908415.jpeg)

---

<div class="post-metadata">

**Author:** ![Disla](https://yyz2.discourse-cdn.com/free1/user_avatar/calculix.discourse.group/disla/32/3548_2.png) [@Disla](https://calculix.discourse.group/u/Disla)\
**Post date:** [May 19, 2022, 11:18am UTC](https://calculix.discourse.group/t/contact-problem-with-overlapping-mesh-results/1105/2 "2022-05-19T11:18:12Z")

</div>

Hi ,

You have a nice tutorial on this :

[![](https://global.discourse-cdn.com/free1/uploads/calculix/original/2X/e/e9206af02208888936114e79ccd84ff977fb380e.jpeg "Mecway / Calculix - simple contact and friction") ](https://www.youtube.com/watch?v=lx0-2XtFz1Y)

Find attached the inp file.

[https://we.tl/t-uKI3A6Ua4h](https://we.tl/t-uKI3A6Ua4h)

---

<div class="post-metadata">

**Author:** ![caeplayer](https://avatars.discourse-cdn.com/v4/letter/c/3d9bf3/32.png) [@caeplayer](https://calculix.discourse.group/u/caeplayer)\
**Post date:** [May 19, 2022, 12:20pm UTC](https://calculix.discourse.group/t/contact-problem-with-overlapping-mesh-results/1105/3 "2022-05-19T12:20:55Z")

</div>

Thanks!!!  
However, my case .inp files setting is the same as yours!  
The problem is that a black plastic pin is inserted into a red plastic hole, but the mesh on the interfaces are overlapping(even my mesh is quite small).  
Could you know how to prevent from this overlapping phenamona?

---

<div class="post-metadata">

**Author:** ![Disla](https://yyz2.discourse-cdn.com/free1/user_avatar/calculix.discourse.group/disla/32/3548_2.png) [@Disla](https://calculix.discourse.group/u/Disla)\
**Post date:** [May 19, 2022, 12:57pm UTC](https://calculix.discourse.group/t/contact-problem-with-overlapping-mesh-results/1105/4 "2022-05-19T12:57:19Z")

</div>

This looks more like an interference-fit-pressure problem.

You also have a nice example with files an further discussion on :

> **[Interference fit pressure comparison MECWAY/CALCULIX & ANSYS.](https://mecway.com/forum/discussion/1107/interference-fit-pressure-comparison-mecway-calculix-ansys)**
>
> Hello, I have reproduced a study case from ANSYS forum to help me better understand how contact works.

The problem is based on another video tutorial:

[![](https://global.discourse-cdn.com/free1/uploads/calculix/original/2X/a/accc17743cc2ecf45a63049a56f6c7c6a4c9c8d0.jpeg "Mecway / Calculix - simple press fit") ](https://www.youtube.com/watch?v=MYFW7MBtqI4)

Find associated inp file.

[https://we.tl/t-AI2zLcwU8O](https://we.tl/t-AI2zLcwU8O)

---

<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 19, 2022, 5:02pm UTC](https://calculix.discourse.group/t/contact-problem-with-overlapping-mesh-results/1105/5 "2022-05-19T17:02:27Z")

</div>

We had a discussion about interference fit modeling here:

> [@Modeling interference fit (shrink fit)](https://calculix.discourse.group/t/modeling-interference-fit-shrink-fit/603):
>
> Hi, does CalculiX have an option to model interference fit (shrink fit / press fit) in contact? So that I can place two parts with initial interference and it will be resolved by the solver with stress and strain generation (unlike slave adjustment in tie constraint). I haven’t seen any keyword for that but I came across some websites mentioning presfit option, however I’m not sure how to use it. Especially that I submit the job via preprocessor and I don’t use any commands for solver. Is there…