Force displacement meaning

About the development of the FEM module/workbench.

Moderator: bernd

User avatar
Vladi
Posts: 8
Joined: Tue Jan 16, 2018 7:33 pm
Location: Nyíregyháza/Hungary/EU

Force displacement meaning

Postby Vladi » Tue Feb 20, 2018 7:48 pm

Hello FreeCAD forum!

I'm trying to test a part. I use 0.16:

Code: Select all

OS: Windows 7
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.16.6712 (Git)
Build type: Release
Branch: releases/FreeCAD-0-16
Hash: da2d364457257a7a8c6fb2137cea12c45becd71a
Python version: 2.7.8
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 6.8.0.oce-0.17
First i add some force, for exaple 100 Newton:

link.

But I really dont understand, what does it mean in result screen:

Displacement: factor 1-100

:?

It is my first force in 100 times, or the full force 100 percent?

So:
a: 100*100=10000
b: 100*1=100

Thanks. :D
Attachments
displacement.png
displacement.png (181.04 KiB) Viewed 498 times
force.png
force.png (164.34 KiB) Viewed 498 times
thschrader
Posts: 2099
Joined: Sat May 20, 2017 12:06 pm
Location: Germany

Re: Force displacement meaning

Postby thschrader » Wed Feb 21, 2018 2:25 pm

Hi Vladi,
the slider is for adjusting the deflection to check if the deformation is plausible
(if not, try an other model...)
The values are the max values calculated. In my example:
Beam steel 100x10x10 mm, 500 N loading. The theoretical z-deflection according
to beam-theory is 0,95 mm (in opposite z-dir). Thats what we got...
BTW: you should use FC0.17 for FEM:
https://forum.freecadweb.org/viewtopic.php?f=18&t=12212
deflection.JPG
deflection.JPG (72.98 KiB) Viewed 415 times
User avatar
Vladi
Posts: 8
Joined: Tue Jan 16, 2018 7:33 pm
Location: Nyíregyháza/Hungary/EU

Re: Force displacement meaning

Postby Vladi » Mon Feb 26, 2018 6:56 pm

Thanks thschrader!

I will do again with 0.17 and come with results later!