FEM Analysis

[kreykf]

Dear friends,
i have a question regarding fem analysis. i managed to design a small object, edit a material (polyurethane) and run a fem analysis. In the results, i can see that the objects stretch along the x-axis about 10mm as expected. A force 2N is applied for the solver. Now my question. Is it possible to get the results of force as a function of the stretching? What i mean is, stretching 2mm gives force xxx, stretching 5mm gives force yyy... and so on. Is this somewhere hidden?

Kind regard and thanks for the help in advance,
Karl

[chrisb]

Moved to FEM forum.

[RatonLaveur]

Instead of applying a force, you apply a displacement as the boundary condition. You need to setup your solver to compute force. Alternatively the force can be calculated from average stress.

[kreykf]

Thank you for the quick answer!! i applied displacement as a boundary condition, works! But how do i setup my solver (calculix) to compute force?
kind regards and thank you for the help!!!
Karl

edit:
is it the info in the ccx file?
total force (fx,fy,fz) for set CONSTRAINTFIXED and time 0.1000000E+01

-2.024012E+00 -7.990929E-13 -5.637818E-13

[RatonLaveur]

That looks like a solid 2N to me on the x axis, and some fairy space dust for the y and z components, i may be wrong.

Note: i am not a calculix user at all. Hence why i can only give pointers.

[Jee-Bee]

I think you need *NODE PRINT, *NODE FILE or *NODE OUTPUT for this.
But this means manual editing the inp file.

https://www.feacluster.com/CalculiX/ccx ... de190.html

[bernd]

But how do i setup my solver (calculix) to compute force?

edit:
is it the info in the ccx file?
total force (fx,fy,fz) for set CONSTRAINTFIXED and time 0.1000000E+01

-2.024012E+00 -7.990929E-13 -5.637818E-13

yes