# Plot history for principal stress- maximum and minimum

**URL:** <https://forum.itascainternational.com/t/plot-history-for-principal-stress-maximum-and-minimum/1042>\
**Category:** UDEC\
**Tags:** suggestions\
**Created:** [May 25, 2023, 1:52am UTC](https://forum.itascainternational.com/t/plot-history-for-principal-stress-maximum-and-minimum/1042 "2023-05-25T01:52:50Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Binu](https://avatars.discourse-cdn.com/v4/letter/b/3ab097/32.png) [@Binu](https://forum.itascainternational.com/u/Binu)\
**Post date:** [May 25, 2023, 1:52am UTC](https://forum.itascainternational.com/t/plot-history-for-principal-stress-maximum-and-minimum/1042/1 "2023-05-25T01:52:50Z")

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How to plot history for principal stress- maximum and minimum in udec.  
I tried Block zone history stress-p max 0,0

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**Author:** ![Jay](https://avatars.discourse-cdn.com/v4/letter/j/ed8c4c/32.png) [@Jay](https://forum.itascainternational.com/u/Jay)\
**Post date:** [May 26, 2023, 6:06am UTC](https://forum.itascainternational.com/t/plot-history-for-principal-stress-maximum-and-minimum/1042/2 "2023-05-26T06:06:43Z")

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Binu  
There is no command like you mentioned in UDEC ver 7. You will have to write a small fish function to get principal stresses. However, the command “pr zone stresses” lists the principal stresses in the zones.  
Jay

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**Author:** ![Binu](https://avatars.discourse-cdn.com/v4/letter/b/3ab097/32.png) [@Binu](https://forum.itascainternational.com/u/Binu)\
**Post date:** [May 29, 2023, 2:43am UTC](https://forum.itascainternational.com/t/plot-history-for-principal-stress-maximum-and-minimum/1042/3 "2023-05-29T02:43:37Z")

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> [@Jay](#):
>
> pr zone stresses

Thank you Jay.

Can you explain more on fish function to get Principal stresses.

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**Author:** ![udecsupport](https://avatars.discourse-cdn.com/v4/letter/u/e9c0ed/32.png) [@udecsupport](https://forum.itascainternational.com/u/udecsupport)\
**Post date:** [June 2, 2023, 4:09pm UTC](https://forum.itascainternational.com/t/plot-history-for-principal-stress-maximum-and-minimum/1042/4 "2023-06-02T16:09:21Z")

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There is an example data file provided in the datafiles/fish/library/3D\_prncipal\_stress folder that could be adapted to provide the principal stress for a zone. You can also use the FISH function tensor.prin,

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**Author:** ![Binu](https://avatars.discourse-cdn.com/v4/letter/b/3ab097/32.png) [@Binu](https://forum.itascainternational.com/u/Binu)\
**Post date:** [June 9, 2023, 2:23am UTC](https://forum.itascainternational.com/t/plot-history-for-principal-stress-maximum-and-minimum/1042/5 "2023-06-09T02:23:40Z")

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thank you. I got it and now able to get.

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**Author:** ![Damir](https://avatars.discourse-cdn.com/v4/letter/d/7993a0/32.png) [@Damir](https://forum.itascainternational.com/u/Damir)\
**Post date:** [November 7, 2025, 11:27am UTC](https://forum.itascainternational.com/t/plot-history-for-principal-stress-maximum-and-minimum/1042/6 "2025-11-07T11:27:16Z")

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What means if “Shell Stress (elastic-max)”, or “Shell Stress (elastic-min)” is reported using GUI. Values seem constant over element and different from Maximum or Minimum Principal Stresses in shells, also reported using GUI.