FEM - Dynamic Loads?

About the development of the FEM module/workbench.

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HarryvL
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Re: FEM - Dynamic Loads?

Post by HarryvL » Mon May 28, 2018 10:33 am

JensElmo wrote:
Mon May 28, 2018 10:15 am
Jee-Bee wrote:
Mon May 28, 2018 8:52 am
Can you add you're inp file? with out it we can't see what you changed...
Oh, yes of course, the attachment wonøt let me attach an inp file, so i zipped it
It works after adding:

1) A frequency step as advised above

2) A density card, which you forgot:

Code: Select all

*MATERIAL, NAME=SolidMaterial
*ELASTIC
210000, 0.300
*DENSITY
7.900e-09     
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HarryvL
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Re: FEM - Dynamic Loads?

Post by HarryvL » Mon May 28, 2018 10:50 am

FEMMeshNetgen.inp.zip
(61.44 KiB) Downloaded 36 times
-
hcpy_1.gif
hcpy_1.gif (11.46 KiB) Viewed 608 times
JensElmo
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Re: FEM - Dynamic Loads?

Post by JensElmo » Mon May 28, 2018 11:37 am

Thanks so much, now it seems to work.
A quick question, what program are you using to make that picture with results?
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bernd
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Re: FEM - Dynamic Loads?

Post by bernd » Mon May 28, 2018 12:18 pm

JensElmo wrote:
Mon May 28, 2018 11:37 am
A quick question, what program are you using to make that picture with results?
CalculiX cgx the post processor of CalculiX ccx
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HarryvL
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Re: FEM - Dynamic Loads?

Post by HarryvL » Mon May 28, 2018 12:29 pm

bernd wrote:
Mon May 28, 2018 12:18 pm
JensElmo wrote:
Mon May 28, 2018 11:37 am
A quick question, what program are you using to make that picture with results?
CalculiX cgx the post processor of CalculiX ccx
Yup. Better use FreeCAD though :D
stephio_maf
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Re: FEM - Dynamic Loads?

Post by stephio_maf » Fri Aug 24, 2018 1:56 am

Hello,
Could you help me to understand how to set a dynamic load for a thermomechanical analysis?
I I have 4 steps, I apply some loads from the beginning and I apply the rest of the loads on the 3rd step.
is it possible to set this in Freecad FEM UI?

Kazu
mac_the_bike
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Re: FEM - Dynamic Loads?

Post by mac_the_bike » Tue Oct 08, 2019 10:48 am

HarryvL wrote:
Mon May 28, 2018 12:29 pm
bernd wrote:
Mon May 28, 2018 12:18 pm
JensElmo wrote:
Mon May 28, 2018 11:37 am
A quick question, what program are you using to make that picture with results?
CalculiX cgx the post processor of CalculiX ccx
Yup. Better use FreeCAD though :D

HarryvL, bernd and JensElmo --

Steady State Dynamics:

Sorry this is a bit late (by 1 year!) but have checked that you are plotting the displacement that you think you are.
The displacements from an SSD analysis are complex, i.e. they have real and imaginary parts, and plotting just the real or imag part doesn't mean anything.

The displacements that should be plotted are the amplitudes, i.e. the sqrt(real**2 + imag**2), i.e. the magnitude of the displacement.

mac
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HarryvL
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Re: FEM - Dynamic Loads?

Post by HarryvL » Tue Oct 08, 2019 7:17 pm

Indeed. This came up in several posts.
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