create model / inp file with aditional nodes(point(s))

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Jee-Bee
Posts: 2145
Joined: Tue Jun 16, 2015 10:32 am
Location: Netherlands

create model / inp file with aditional nodes(point(s))

Post by Jee-Bee » Mon Aug 10, 2020 12:34 pm

I want to create the following model in FC.
2020-08-10 13_18_36-_New document 1 - Inkscape.png
2020-08-10 13_18_36-_New document 1 - Inkscape.png (16.41 KiB) Viewed 264 times
basically it is a plate i want to add a (point)mass and a spring to it. But i'm unable to create a mesh with the extra point or add any constraint to the point( after pressing ok raise a "Unknown c++ exception").
What is a (the best ) workflow to work around it?
In my case it is probably a simple case to add a single node. but for it is also a test for a more difficult one.
Creating 2 meshes and modifying the inp is not possible since:
- a sketch is (currently) not a valid input type(why?).
- a draft is a valid object but it is not valid to have 2 meshes in a single analysis.
- Export the model with extra point as brep. create mesh and it looks if the point exist in the inp file. and import it in FC. and the point is vanished...

Code: Select all

OS: Windows 7 SP 1 (6.1)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.21514 (Git)
Build type: Release
Branch: master
Hash: 89ddab33f692a9bd739171689f9ab0eb58d64b35
Python version: 3.6.8
Qt version: 5.12.1
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: Dutch/Netherlands (nl_NL)
Any help with this would be great!
Attachments
FEM_Mass_test.FCStd
(124.72 KiB) Downloaded 17 times
FEM_Mass_test.7z
(17.2 KiB) Downloaded 16 times
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bernd
Posts: 10956
Joined: Sun Sep 08, 2013 8:07 pm
Location: Zürich, Switzerland

Re: create model / inp file with aditional nodes(point(s))

Post by bernd » Mon Aug 10, 2020 4:18 pm

your example has a hole not a point ?!

For a point I would create a BooleanFragment from the solid and the point on the Solid surface.

What do you need in the inp file? A node set from this one point?
Jee-Bee
Posts: 2145
Joined: Tue Jun 16, 2015 10:32 am
Location: Netherlands

Re: create model / inp file with aditional nodes(point(s))

Post by Jee-Bee » Tue Aug 11, 2020 8:33 am

Correct there is a hole in the plate.
below the hole there is a (datum)point. probably it is turned off.
In the graphic i wasn't able to create a hole in the plate. The idea is that between the hole and the point i add a spring(http://www.feacluster.com/CalculiX/ccx_ ... de305.html) and on the point i add a mass(http://www.feacluster.com/CalculiX/ccx_ ... de272.html).
If i'm able to create inp-fliles i think i can modify the input file for adding a spring and a mass.
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