Materials

[kuroshivo]

Hi all! For some other project I am working on I took a look at the materials data at src/Mod/Material/StandardMaterial and to the following pages and discussions:

http://www.freecadweb.org/wiki/index.php?title=Material
http://www.freecadweb.org/wiki/index.ph ... data_model

viewtopic.php?t=8800
viewtopic.php?f=18&t=19401&start=20

I see a lot of discrepancies, even amongst the actual .FCMat files. Mainly the fact that some properties have units other do not
How are these properties being managed in the FEM module?

BTW, the project I am working on is http://www.caeplex.com a web-based platform for performing mechanical finite-element analysis running on the cloud. It already uses some LGPL’ed covered material from FreeCAD, notably the change view toolbar icons. And of course, the material data (which I assume I can also used under a LGPL).

[yorik]

I see a lot of discrepancies, even amongst the actual .FCMat files. Mainly the fact that some properties have units other do not
How are these properties being managed in the FEM module?

That is true. Basically at the moment materials are used in a very sparse and localized manner (only by FEM and Arch, and both use very different properties). Eivind started working on improving the materials system: https://forum.freecadweb.org/viewtopic.php?f=10&t=16714

There is also someone (DeepSOIC I think) who made something to work on materials from LibreOffice

So there are several efforts around to better the materials system. But yeah, there is still a lot to be done..

For the material properties that have no unit, I think there is a default unit, not sure how FEM handles it...

[bernd]

+1 to what yorik wrote.

In the regard of FEM ... Some of the material properties have a unit developed as a base unit in the unit system (most of the heat transfer properties and the stress (thus youngs modulus too)). At FEM we just read the material data from the material files and use the appropriate base units from unit system.

bernd