# Elasto-plastic calculation faults, similar elastic ok

**URL:** <https://prepomax.discourse.group/t/elasto-plastic-calculation-faults-similar-elastic-ok/1430>\
**Category:** General Questions\
**Created:** [January 18, 2024, 9:29pm UTC](https://prepomax.discourse.group/t/elasto-plastic-calculation-faults-similar-elastic-ok/1430 "2024-01-18T21:29:59Z")\
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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:** [January 19, 2024, 8:18am UTC](https://prepomax.discourse.group/t/elasto-plastic-calculation-faults-similar-elastic-ok/1430/6 "2024-01-19T08:18:09Z")

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Do you have Nlgeom enabled ? It should be on when using the compression only constraint. Can you share the file ?

> [@Antti](#):
>
> There exist other issue also. von Mises stress is far more than stress limit

This is usually due to extrapolation with too coarse mesh: [Higer stress from results than in elasto-plastic curve](https://prepomax.discourse.group/t/higer-stress-from-results-than-in-elasto-plastic-curve/1115)

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