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by josheeg
Wed Aug 01, 2018 2:18 pm
Forum: FEM
Topic: fem analisys on carbon tube specs?
Replies: 30
Views: 1382

Re: fem analisys on carbon tube specs?

Well If I start with a circle give it a radius pad it. set the diameter set the pad run fem on it as a 3d object I get a error .0: We are going to start ... 0.1: Start Gmsh ... 2.7: Gmsh had warnings ... 2.7: Error : Self intersecting surface mesh, computing intersections (this could take a while) E...
by josheeg
Wed Aug 01, 2018 5:06 am
Forum: FEM
Topic: fem analisys on carbon tube specs?
Replies: 30
Views: 1382

Re: fem analisys on carbon tube specs?

I tired making a circle and extruding it setting its material and forces I get a error ..
shell.png
shell.png (241.23 KiB) Viewed 290 times
by josheeg
Wed Aug 01, 2018 4:58 am
Forum: FEM
Topic: fem analisys on carbon tube specs?
Replies: 30
Views: 1382

Re: fem analisys on carbon tube specs?

That is very interesting! I got it to make the solution mesh and colored it with abs displacement and displacement checkbox and slider. So it seems to have a shell is made of some material it says aluminum looking at its features we might be able to do it with calculix steel. The fem constraint disp...
by josheeg
Sun Jul 29, 2018 4:50 am
Forum: FEM
Topic: fem analisys on carbon tube specs?
Replies: 30
Views: 1382

Re: fem analisys on carbon tube specs?

If I have to make the shape out of cubes I will but has anyone used cilanders in freecad fem?
Also has anyone gotten the shell part of fem to work to see how my tube frame would be effected by forces.
by josheeg
Sun Jul 29, 2018 4:37 am
Forum: FEM
Topic: fem analisys on carbon tube specs?
Replies: 30
Views: 1382

Re: fem analisys on carbon tube specs?

Mine did not convert but I have 17 you may have 18 and yours has the fields displayed differently.
I would like to know how and why other people added other materials and how they saved it in here.
mat.png
mat.png (194.7 KiB) Viewed 328 times
by josheeg
Sat Jul 28, 2018 6:34 pm
Forum: FEM
Topic: fem analisys on carbon tube specs?
Replies: 30
Views: 1382

Re: fem analisys on carbon tube specs?

Wouldn't that be incorrect because it had e-6 at the end so move the decimal point 6 places to the left.?
by josheeg
Sat Jul 28, 2018 6:01 pm
Forum: FEM
Topic: fem analisys on carbon tube specs?
Replies: 30
Views: 1382

Re: fem analisys on carbon tube specs?

When I put in 0.0000012146 under kg/mm3 the numbers blank out to 0.00 Is it too large of a number? THe material I make doen't seem to want to hold the values and I can't go back to check after I select ok for the material except make a new one.??? I tried that material to analyse a tube and I get a ...
by josheeg
Sat Jul 28, 2018 3:48 pm
Forum: FEM
Topic: fem analisys on carbon tube specs?
Replies: 30
Views: 1382

Re: fem analisys on carbon tube specs?

kg/m^2 /2000 to get mm
0.486 kg/mm^3

msi to psi 34 msi 34000000psi

0.2 position ratio
freecadfem.png
freecadfem.png (184.51 KiB) Viewed 532 times
by josheeg
Sat Jul 28, 2018 3:36 pm
Forum: FEM
Topic: fem analisys on carbon tube specs?
Replies: 30
Views: 1382

Re: fem analisys on carbon tube specs?

So far what I have in freecad for .5 in carbon fiber tubes
486 kg/mm^3

Young Modulus (GPa) (it's a Elasticity modulus on the datasheet, just convert the msi to GPa)

msi -> psi is what I think freecad would want?
GPA is a unit but freecad fem module says psi?
34000000 psi
by josheeg
Sat Jul 28, 2018 3:16 pm
Forum: FEM
Topic: fem analisys on carbon tube specs?
Replies: 30
Views: 1382

Re: fem analisys on carbon tube specs?

This is what I got with the calculation


calccfconv.png
calccfconv.png (237.45 KiB) Viewed 536 times

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