# Wear simulation - PPM

**URL:** <https://prepomax.discourse.group/t/wear-simulation-ppm/2079>\
**Category:** General Questions\
**Created:** [October 15, 2024, 2:58am UTC](https://prepomax.discourse.group/t/wear-simulation-ppm/2079 "2024-10-15T02:58:51Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Amos](https://avatars.discourse-cdn.com/v4/letter/a/ebca7d/32.png) [@Amos](https://prepomax.discourse.group/u/Amos)\
**Post date:** [October 15, 2024, 2:58am UTC](https://prepomax.discourse.group/t/wear-simulation-ppm/2079/1 "2024-10-15T02:58:51Z")

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#Archard wear simulation of a pin on a curved plate#

I’m not happy with the deformation and the stress profile I’m getting. In addition, the master body is deformed while the slave surface is fine. Could you kindly assist with where I might have gone wrong, or if it’s an issue with the software?

I’m using [PrePoMax version v2.2.0]. Attached is the link to the simulation results.  
[SIMULAION FILE LINK.zip](https://prepomax.discourse.group/uploads/short-url/yoBtXaTkM0epWs3y9gE6KdRbMse.zip) (10.0 KB)

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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:** [October 15, 2024, 7:36am UTC](https://prepomax.discourse.group/t/wear-simulation-ppm/2079/2 "2024-10-15T07:36:38Z")

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You can put the link to the file directly here: [simulation.pmx - Google Drive](https://drive.google.com/file/d/14ribRGmUbTq6y7kVEFM6HkVwJ3zeQ2h1/view?usp=sharing)

It looks ok (apart from excessive penetration in contact) until step 6 increment 43 when the top part of the indenter distorts. Likely due to that interference in contact, I had similar issues here: [Snap-fit contact snagging problem - CalculiX (official versions are on www.calculix.de, the official GitHub repository is at https://github.com/Dhondtguido/CalculiX).](https://calculix.discourse.group/t/snap-fit-contact-snagging-problem/2277)

You may have to change the mesh and adjust the contact settings (mainly stiffness) following the advice in that forum thread.

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**Author:** ![Matej](https://avatars.discourse-cdn.com/v4/letter/m/a698b9/32.png) [@Matej](https://prepomax.discourse.group/u/Matej)\
**Post date:** [October 15, 2024, 9:05am UTC](https://prepomax.discourse.group/t/wear-simulation-ppm/2079/3 "2024-10-15T09:05:28Z")

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You are using re-meshing in the Step-3 but you have no supports preventing the rigid body motion.

 ![image](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/4/450062247e9f9337bfa11ece1b2beab98ef0ef69.png)

In step 3, the computed wear depth is converted to displacements, which are used to load the mesh and compress it inward. The elastic simulation in Step-3 then computes new positions of the internal mesh nodes.But without other supports this will not work. So in Step-3, you need to specify which faces of the model should not move or can only slide (symmetry faces) while the contact surface is compressed inward.

Is the pin supposed to translate only, or should it also rotate?

To have a smooth and robust wear analysis make sure the Sliding distance field moves smoothly from increment to increment without jumping over some nodes.

And the wear will always happen only on one contact surface.

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<div class="post-metadata">

**Author:** ![Amos](https://avatars.discourse-cdn.com/v4/letter/a/ebca7d/32.png) [@Amos](https://prepomax.discourse.group/u/Amos)\
**Post date:** [October 16, 2024, 11:22am UTC](https://prepomax.discourse.group/t/wear-simulation-ppm/2079/4 "2024-10-16T11:22:48Z")

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Thank you for the insights, I managed to get it correct.