# Force time dependent

**URL:** <https://calculix.discourse.group/t/force-time-dependent/1220>\
**Category:** Uncategorized\
**Created:** [August 18, 2022, 10:43am UTC](https://calculix.discourse.group/t/force-time-dependent/1220 "2022-08-18T10:43:25Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![caffeo](https://avatars.discourse-cdn.com/v4/letter/c/5f8ce5/32.png) [@caffeo](https://calculix.discourse.group/u/caffeo)\
**Post date:** [August 18, 2022, 10:43am UTC](https://calculix.discourse.group/t/force-time-dependent/1220/1 "2022-08-18T10:43:25Z")

</div>

Good morning all  
Is possible on calculix insert Force time dependent?

Thank you

Best regards

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<div class="post-metadata">

**Author:** ![Calc\_em](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@Calc\_em](https://calculix.discourse.group/u/Calc_em)\
**Post date:** [August 18, 2022, 11:32am UTC](https://calculix.discourse.group/t/force-time-dependent/1220/2 "2022-08-18T11:32:14Z")

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Yes, you can use the amplitude feature for that. Check the documentation for \*Amplitude keyword.

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<div class="post-metadata">

**Author:** ![caffeo](https://avatars.discourse-cdn.com/v4/letter/c/5f8ce5/32.png) [@caffeo](https://calculix.discourse.group/u/caffeo)\
**Post date:** [August 19, 2022, 9:03am UTC](https://calculix.discourse.group/t/force-time-dependent/1220/3 "2022-08-19T09:03:49Z")

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Thank you  
Are there some example file about amplitude?

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<div class="post-metadata">

**Author:** ![Calc\_em](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@Calc\_em](https://calculix.discourse.group/u/Calc_em)\
**Post date:** [August 19, 2022, 9:05am UTC](https://calculix.discourse.group/t/force-time-dependent/1220/4 "2022-08-19T09:05:31Z")

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Yes, check beamdy1.inp in CalculiX test examples package.

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<div class="post-metadata">

**Author:** ![caffeo](https://avatars.discourse-cdn.com/v4/letter/c/5f8ce5/32.png) [@caffeo](https://calculix.discourse.group/u/caffeo)\
**Post date:** [August 19, 2022, 12:25pm UTC](https://calculix.discourse.group/t/force-time-dependent/1220/5 "2022-08-19T12:25:58Z")

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I’m try but, I attach the inp file.  
Where i wrong?

```auto
**
** Heading +++++++++++++++++++++++++++++++++++++++++++++++++
**
*Heading
Hash: PpYJYxo1, Date: 08/19/2022, Unit system: MM_TON_S_C
**
** Nodes +++++++++++++++++++++++++++++++++++++++++++++++++++
**
*Node
... hidden data ...
**
** Elements ++++++++++++++++++++++++++++++++++++++++++++++++
**
*Element, Type=C3D10, Elset=Solid_part-1
... hidden data ...
**
** Node sets +++++++++++++++++++++++++++++++++++++++++++++++
**
*Nset, Nset=Internal-1_fix
... hidden data ...
*Nset, Nset=Internal-1_load
... hidden data ...
**
** Element sets ++++++++++++++++++++++++++++++++++++++++++++
**
*Elset, Elset=Internal-1_fix_S3
... hidden data ...
*Elset, Elset=Internal-1_fix_S4
... hidden data ...
*Elset, Elset=Internal-1_fix_S2
... hidden data ...
*Elset, Elset=Internal-1_fix_S1
... hidden data ...
*Elset, Elset=Internal-1_load_S2
... hidden data ...
*Elset, Elset=Internal-1_load_S4
... hidden data ...
*Elset, Elset=Internal-1_load_S1
... hidden data ...
*Elset, Elset=Internal-1_load_S3
... hidden data ...
*NSET, NSET=LAST
2755,2754,1600
**
** Surfaces ++++++++++++++++++++++++++++++++++++++++++++++++
**
*Surface, Name=fix, Type=Element
Internal-1_fix_S3, S3
Internal-1_fix_S4, S4
Internal-1_fix_S2, S2
Internal-1_fix_S1, S1
*Surface, Name=load, Type=Element
Internal-1_load_S2, S2
Internal-1_load_S4, S4
Internal-1_load_S1, S1
Internal-1_load_S3, S3
**
** Physical constants ++++++++++++++++++++++++++++++++++++++
**
**
** Materials +++++++++++++++++++++++++++++++++++++++++++++++
**
*Material, Name=S355_mio
*Density
7.8E-09
*Elastic
210000, 0.28
*Expansion, Zero=20
1.1E-05
*Conductivity
14
*Specific heat
440000000
*Plastic
355, 0.002
450, 0.0025
550, 0.006
600, 0.015
**
** Sections ++++++++++++++++++++++++++++++++++++++++++++++++
**
*Solid section, Elset=Solid_part-1, Material=S355_mio
**
** Pre-tension sections ++++++++++++++++++++++++++++++++++++
**
**
** Constraints +++++++++++++++++++++++++++++++++++++++++++++
**
**
** Surface interactions ++++++++++++++++++++++++++++++++++++
**
**
** Contact pairs +++++++++++++++++++++++++++++++++++++++++++
**
**
** Initial conditions ++++++++++++++++++++++++++++++++++++++
**
*AMPLITUDE,NAME=A1
0.,1000.,5,1000,10,0
**
** Steps +++++++++++++++++++++++++++++++++++++++++++++++++++
**
**
** Step-1 ++++++++++++++++++++++++++++++++++++++++++++++++++
**
*Step, Nlgeom, Inc=100
*Static
1, 10, 1E-05, 1E+30
**
** Boundary conditions +++++++++++++++++++++++++++++++++++++
**
*Boundary, op=New
** Name: Fixed-1
*Boundary
Internal-1_fix, 1, 6, 0
**
** Loads +++++++++++++++++++++++++++++++++++++++++++++++++++
**
*Cload, op=New
*Dload, op=New
** Name: Surface_traction-1: Deactivated
***CLOAD,AMPLITUDE=A1**
 **LAST,2,1000.**
**
** Defined fields ++++++++++++++++++++++++++++++++++++++++++
**
**
** History outputs +++++++++++++++++++++++++++++++++++++++++
**
**
** Field outputs +++++++++++++++++++++++++++++++++++++++++++
**
*Node file
RF, U
*El file
S, E, PEEQ
**
** End step ++++++++++++++++++++++++++++++++++++++++++++++++
**
*End step

```

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<div class="post-metadata">

**Author:** ![Calc\_em](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@Calc\_em](https://calculix.discourse.group/u/Calc_em)\
**Post date:** [August 19, 2022, 12:32pm UTC](https://calculix.discourse.group/t/force-time-dependent/1220/6 "2022-08-19T12:32:18Z")

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> [@caffeo](#):
>
> ```auto
> ***CLOAD,AMPLITUDE=A1**
> **LAST,2,1000.**
> 
> ```

Load is commented out and thus deactivated here. Remove the redundant starts:

```auto
*CLOAD,AMPLITUDE=A1
LAST,2,1000.

```

If you are using PrePoMax, you don’t have to define amplitudes manually. They are supported in the current version.

Also, keep in mind that you have to adjust the step time accordingly.

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<div class="post-metadata">

**Author:** ![caffeo](https://avatars.discourse-cdn.com/v4/letter/c/5f8ce5/32.png) [@caffeo](https://calculix.discourse.group/u/caffeo)\
**Post date:** [August 19, 2022, 1:13pm UTC](https://calculix.discourse.group/t/force-time-dependent/1220/7 "2022-08-19T13:13:00Z")

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i’ts work! thank you!  
What is the rule for time step on prepomax?

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<div class="post-metadata">

**Author:** ![Calc\_em](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@Calc\_em](https://calculix.discourse.group/u/Calc_em)\
**Post date:** [August 19, 2022, 1:14pm UTC](https://calculix.discourse.group/t/force-time-dependent/1220/8 "2022-08-19T13:14:58Z")

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In static analyses you can use 1 unless you want to include dependency on time (like transient force discussed here). Then it should be equal to the actual time of the simulated process so that you can set the amplitude properly.