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by wingman
Mon Feb 10, 2020 9:05 pm
Forum: FEM
Topic: Modelling and analyzing parts with composites ?
Replies: 17
Views: 485

Re: Modelling and analyzing parts with composites ?

On a related note, does FreeCAD have an "unfolder" whereby the user can click on a surface and FreeCAD will create a 2D pattern for pliable material that would cover the surface ? This would be another great tool for composites...
by wingman
Mon Feb 10, 2020 9:02 pm
Forum: FEM
Topic: Modelling and analyzing parts with composites ?
Replies: 17
Views: 485

Re: Modelling and analyzing parts with composites ?

wow! that would be a great addition! I'm dealing on daily basis (using NX NASTRAN) with honeycombs sandwich panels. We use planar meshes with laminate (multi-plies) idealization. In the NASTRAN terminology, it is a PCOMP card. In case of needs, I'm volunteer to write and document some test-cases an...
by wingman
Mon Feb 10, 2020 8:59 pm
Forum: FEM
Topic: Modelling and analyzing parts with composites ?
Replies: 17
Views: 485

Re: Modelling and analyzing parts with composites ?

I forgot to ask? Would you like to use volume mesh or shell mesh to analyse the composite structure? Not sure yet. I'm guessing we would need both, to cover all use cases. Either one would be a start. To implement this https://www.researchgate.net/post/CFRP_with_CalculiX for shell meshes does not s...
by wingman
Mon Feb 10, 2020 8:53 pm
Forum: FEM
Topic: Modelling and analyzing parts with composites ?
Replies: 17
Views: 485

Re: Modelling and analyzing parts with composites ?

bernd wrote:
Mon Feb 10, 2020 1:25 pm
The first thing we need is a simple composite example in ccx. Anyone around who has one?
There is one in here.
https://ntrs.nasa.gov/archive/nasa/casi ... 029045.pdf
by wingman
Mon Feb 10, 2020 8:51 pm
Forum: FEM
Topic: Modelling and analyzing parts with composites ?
Replies: 17
Views: 485

Re: Modelling and analyzing parts with composites ?

FreeCAD itself doesn't do the solving, it just writes a text file that is used as input for external FEM solvers, like Calculix, Z88, Elmer, OpenFOAM, etc. So, the support from FreeCAD may be quite basic. It's the solver the one that needs to support composite materials in some way. I think the pro...
by wingman
Sun Feb 09, 2020 10:24 pm
Forum: FEM
Topic: Modelling and analyzing parts with composites ?
Replies: 17
Views: 485

Re: Modelling and analyzing parts with composites ?

bernd wrote:
Sun Feb 09, 2020 7:18 pm
If calculix supports it, FreeCAD FEM is capable of supporting it.
What is the appetite for adding composite materials to FreeCAD, so that it can be FEA'd ?
by wingman
Sun Feb 09, 2020 8:18 pm
Forum: FEM
Topic: Modelling and analyzing parts with composites ?
Replies: 17
Views: 485

Re: Modelling and analyzing parts with composites ?

bernd wrote:
Sun Feb 09, 2020 7:18 pm
ATM FreeCAD FEM materials are isotrph.
Therein lies the issue. Ideas ?

I posted this in the materials section:
https://forum.freecadweb.org/viewtopic. ... 11#p367711
by wingman
Sun Feb 09, 2020 8:15 pm
Forum: FEM
Topic: Modelling and analyzing parts with composites ?
Replies: 17
Views: 485

Re: Modelling and analyzing parts with composites ?

Calculix seems to be able to handle composites. https://www.youtube.com/watch?v=68bezsY-1m8 https://www.researchgate.net/post/CFRP_with_CalculiX https://researchspace.csir.co.za/dspace/bitstream/handle/10204/10431/Botha_21362_2018.pdf?sequence=1&isAllowed=y Searching for the word composite in the ma...
by wingman
Sun Feb 09, 2020 12:58 pm
Forum: FEM
Topic: Modelling and analyzing parts with composites ?
Replies: 17
Views: 485

Modelling and analyzing parts with composites ?

Is there a way to model and analyse parts made of a composite material such as carbon fiber, wherein the material properties are different depending on the orientation of the material ? Ideas https://www.youtube.com/watch?v=ArKuHrMRtJk https://www.youtube.com/watch?v=XKuQ9fIh_PE https://sfepy.org/do...
by wingman
Sun Feb 09, 2020 12:43 pm
Forum: Material
Topic: Directional specific properties: composites.
Replies: 0
Views: 185

Directional specific properties: composites.

Is there a way to give FreeCAD materials different properties in each direction (XYZ)? For example, carbon fibre has different tensile strength in various directions depending on the orientation of the fibres within the material. Is there a way to use directional properties in FreeCAD ? Ideas https:...

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