# No stress results?

**URL:** <https://prepomax.discourse.group/t/no-stress-results/2801>\
**Category:** General Questions\
**Created:** [June 26, 2025, 11:14am UTC](https://prepomax.discourse.group/t/no-stress-results/2801 "2025-06-26T11:14:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![lukerickert](https://avatars.discourse-cdn.com/v4/letter/l/53a042/32.png) [@lukerickert](https://prepomax.discourse.group/u/lukerickert)\
**Post date:** [June 26, 2025, 11:14am UTC](https://prepomax.discourse.group/t/no-stress-results/2801/1 "2025-06-26T11:14:00Z")

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Hi all, I am sure I have done something wrong but I can’t figure out what.

I have a good size shell model using default material properties (S355) with a compound part. I also have the default outputs. The max stress is reported as 1.2E-11 despite there being significant deformation. I have tried running static with both linear and non-linear with the same result (or lack of results that is) I have done plenty of shell models before but never seen this. I had plastic properties applied which I thought might be the issue but that didn’t make any difference. I have run some other very similar models on this version of Propomax without any issue so I am really puzzled.

thanks  
Luke

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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:** [June 26, 2025, 11:26am UTC](https://prepomax.discourse.group/t/no-stress-results/2801/2 "2025-06-26T11:26:26Z")

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Maybe the model is unconstrained/underconstrained and there’s only rigid body motion. Run a frequency analysis to check it.