# Symmetrical Load| Asymmetrical stress output

**URL:** <https://calculix.discourse.group/t/symmetrical-load-asymmetrical-stress-output/1630>\
**Category:** Uncategorized\
**Created:** [April 29, 2023, 6:12pm UTC](https://calculix.discourse.group/t/symmetrical-load-asymmetrical-stress-output/1630 "2023-04-29T18:12:16Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Fallen](https://avatars.discourse-cdn.com/v4/letter/f/e99b99/32.png) [@Fallen](https://calculix.discourse.group/u/Fallen)\
**Post date:** [April 29, 2023, 6:12pm UTC](https://calculix.discourse.group/t/symmetrical-load-asymmetrical-stress-output/1630/1 "2023-04-29T18:12:16Z")

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Hello People of the Internet.

This Semester we were introduced to calculix. As of now I struggle with truss elements. As an exercise I created a simple table structure. The INP File is the following  
\*HEADING  
Model: T3D2 Example, Nodal Load  
\*NODE, NSET=Nall  
1, -2.0e3, 2.0e3, 0.0e3  
2, 2.0e3, 2.0e3, 0.0e3  
3, 2.0e3, 2.0e3, 4.0e3  
4, -2.0e3, 2.0e3, 4.0e3  
5, 0.0e3, 2.0e3, 4.0e3  
6, -2.0e3, -2.0e3, 4.0e3  
7, 2.0e3, -2.0e3, 4.0e3  
8, 0.0e3, -2.0e3, 4.0e3  
9, -2.0e3, -2.0e3, 0.0e3  
10, 2.0e3, -2.0e3, 0.0e3  
\*ELEMENT, TYPE=T3D2, ELSET=Balken  
1, 1, 4  
2, 2, 3  
3, 3, 5  
4, 4, 5  
5, 4, 6  
6, 5, 8   
7, 3, 7  
8, 6, 8  
9, 7, 8  
10, 6, 9  
11, 7, 10  
\*BOUNDARY  
1,1,3  
2,1,3  
9,1,3  
10,1,3  
\*MATERIAL,NAME=EL  
\*ELASTIC  
7e4,0.34  
\*SOLID SECTION,ELSET=Balken,MATERIAL=EL  
2.5e4  
\*STEP  
\*STATIC  
\*CLOAD  
1,3,-1E+03  
2,3,-1E+03  
3,3,-1E+03  
4,3,-1E+03  
5,3,-1E+03  
6,3,-1E+03  
7,3,-1E+03  
8,3,-1E+03  
9,3,-1E+03  
10,3,-1E+03  
\*NODE PRINT,NSET=Nall  
U, RF  
\*EL PRINT,ELSET=Balken  
S  
\*NODE FILE, OUTPUT=3D  
U  
\*EL FILE  
S  
\*END STEP  
As you can see. The Load is symmetrical, yet my von-mises stress is asymmetrical. Are these just calculation problems or is something wrong with my input file. Thank you for every answer.  
Here is the stress output

 ![Stress](https://global.discourse-cdn.com/free1/uploads/calculix/original/2X/c/c6b289f6d73a6c11dcc3cf71ccd9a644ca35d7af.png)

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<div class="post-metadata">

**Author:** ![dichtstoff](https://avatars.discourse-cdn.com/v4/letter/d/dec6dc/32.png) [@dichtstoff](https://calculix.discourse.group/u/dichtstoff)\
**Post date:** [April 29, 2023, 6:25pm UTC](https://calculix.discourse.group/t/symmetrical-load-asymmetrical-stress-output/1630/2 "2023-04-29T18:25:24Z")

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hello,  
how looks deformation?  
maybe these can help. It should be symmetrical too?  
wbr

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<div class="post-metadata">

**Author:** ![Fallen](https://avatars.discourse-cdn.com/v4/letter/f/e99b99/32.png) [@Fallen](https://calculix.discourse.group/u/Fallen)\
**Post date:** [April 29, 2023, 6:28pm UTC](https://calculix.discourse.group/t/symmetrical-load-asymmetrical-stress-output/1630/3 "2023-04-29T18:28:03Z")

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They are asymmetrical as well. Is there a possibility that it doesnt work correctly because I am using a windows adaptation?

 ![Pic2](https://global.discourse-cdn.com/free1/uploads/calculix/original/2X/1/1ebc19737abd6195d9319640b1294c44b6b77ec3.png)

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<div class="post-metadata">

**Author:** ![dichtstoff](https://avatars.discourse-cdn.com/v4/letter/d/dec6dc/32.png) [@dichtstoff](https://calculix.discourse.group/u/dichtstoff)\
**Post date:** [April 29, 2023, 6:50pm UTC](https://calculix.discourse.group/t/symmetrical-load-asymmetrical-stress-output/1630/4 "2023-04-29T18:50:20Z")

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Hello,  
if you use truss elements,  
your system is instabil  
if you change to nlgeom= on  
you maybe get an error  
wbr

\*STEP, NLGEOM

> **[Statically indeterminate](https://en.wikipedia.org/wiki/Statically_indeterminate)**
>
> In statics and structural mechanics, a structure is statically indeterminate when the static equilibrium equations – force and moment equilibrium conditions – are insufficient for determining the internal forces and reactions on that structure.
> Based on Newton's laws of motion, the equilibrium equations available for a two-dimensional body are:
> In the beam construction on the right, the four unknown reactions are VA, VB, VC, and HA. The equilibrium equations are:
> Since there are four unknown...

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<div class="post-metadata">

**Author:** ![dichtstoff](https://avatars.discourse-cdn.com/v4/letter/d/dec6dc/32.png) [@dichtstoff](https://calculix.discourse.group/u/dichtstoff)\
**Post date:** [April 29, 2023, 7:09pm UTC](https://calculix.discourse.group/t/symmetrical-load-asymmetrical-stress-output/1630/5 "2023-04-29T19:09:42Z")

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maybe you change to beam elements

> **[Statics: Trusses](https://engineeringstatics.org/Chapter_06-trusses.html)**

```auto
*HEADING
Model: T3D2 Example, Nodal Load
*NODE, NSET=Nall
1, -2.0e3, 2.0e3, 0.0e3
2, 2.0e3, 2.0e3, 0.0e3
3, 2.0e3, 2.0e3, 4.0e3
4, -2.0e3, 2.0e3, 4.0e3
5, 0.0e3, 2.0e3, 4.0e3
6, -2.0e3, -2.0e3, 4.0e3
7, 2.0e3, -2.0e3, 4.0e3
8, 0.0e3, -2.0e3, 4.0e3
9, -2.0e3, -2.0e3, 0.0e3
10, 2.0e3, -2.0e3, 0.0e3
*ELEMENT, TYPE=B31, ELSET=Balken
1, 1, 4
2, 2, 3
3, 3, 5
4, 4, 5
5, 4, 6
6, 5, 8
7, 3, 7
8, 6, 8
9, 7, 8
10, 6, 9
11, 7, 10
*BOUNDARY
1,1,3
2,1,3
9,1,3
10,1,3
*MATERIAL,NAME=EL
*ELASTIC
7e4,0.34
*BEAM SECTION,MATERIAL=EL,ELSET=Balken,SECTION=RECT
100,100
1,1,1
*STEP,nlgeom
*STATIC, SOLVER=SPOOLES
*CLOAD
1,3,-1E+03
2,3,-1E+03
3,3,-1E+03
4,3,-1E+03
5,3,-1E+03
6,3,-1E+03
7,3,-1E+03
8,3,-1E+03
9,3,-1E+03
10,3,-1E+03
*NODE PRINT,NSET=Nall
U, RF
*EL PRINT,ELSET=Balken
S
*NODE FILE, OUTPUT=3D
U
*EL FILE
S
*END STEP

```