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by EkaitzEsteban
Tue Oct 16, 2018 11:39 am
Forum: FEM
Topic: Display principal stresses
Replies: 39
Views: 3332

Re: Display principal stresses

Very interesting, I will need it sometime...

kudos. ;)
by EkaitzEsteban
Tue Oct 16, 2018 8:25 am
Forum: FEM
Topic: [SOLVED] Frequency analysis - Less eigenmodes are calculated
Replies: 1
Views: 176

[SOLVED] Frequency analysis - Less eigenmodes are calculated

Hello, I have a question regarding to obtained results in frequency analysis. I have a free-free workpiece (without constrains or boundary conditions). I set the calculation of 20 eigenmodes by changing in the inp file the amount of eigenmodes *STEP *FREQUENCY 20,0.0,100000.0 *END STEP I also setthe...
by EkaitzEsteban
Tue Oct 16, 2018 8:02 am
Forum: FEM
Topic: [SOLVED] Error using *STEP, PERTURBATION
Replies: 6
Views: 227

Re: [SOLVED] Error using *STEP, PERTURBATION

Not the first time that this problem is popping up... See: https://forum.freecadweb.org/viewtopic.php?t=20392 Thank you Jee-bee! I solved the problem including the density value in the material. The rest is exactly as explained in Calculix manual. Did you generate the file with FreeCAD GUI, it shou...
by EkaitzEsteban
Tue Oct 16, 2018 7:48 am
Forum: FEM
Topic: [SOLVED but hack is required] *INITIAL CONDITIONS, TYPE=STRESS
Replies: 5
Views: 234

Re: [Help, info] *INITIAL CONDITIONS, TYPE=STRESS

Hello, I will post some inputs. Using *INITIAL CONDITIONS, TYPE=STRESS card it is possible to simulate residual stress without requiring fixed boundary conditions and without adding loads. This can be done by typing in input file (it is an example C3D10 element with 4 integration points): *INITIAL C...
by EkaitzEsteban
Mon Oct 15, 2018 10:01 am
Forum: FEM
Topic: [SOLVED but hack is required] *INITIAL CONDITIONS, TYPE=STRESS
Replies: 5
Views: 234

Re: [Help, info] *INITIAL CONDITIONS, TYPE=STRESS

You can ask ccx to write element stresses into the .dat file by *EL PRINT S you will obtain something like: stresses (elem, integ.pnt.,sxx,syy,szz,sxy,sxz,syz) for set EALL and time 0.1000000E+01 109 1 -1.939353E+01 -1.272398E-03 2.760113E-01 -2.675997E-01 7.474604E-01 3.491194E-02 109 2 -2.050975E...
by EkaitzEsteban
Mon Oct 15, 2018 10:01 am
Forum: FEM
Topic: [SOLVED but hack is required] *INITIAL CONDITIONS, TYPE=STRESS
Replies: 5
Views: 234

Re: [Help, info] *INITIAL CONDITIONS, TYPE=STRESS

Jee-Bee wrote:
Thu Oct 11, 2018 5:08 pm
maybe here are some clues...
http://www.feacluster.com/CalculiX/ccx_ ... conditions

(check examples!!)
Thank you Jee-Bee I will check the examples.
by EkaitzEsteban
Thu Oct 11, 2018 4:50 pm
Forum: FEM
Topic: [SOLVED but hack is required] *INITIAL CONDITIONS, TYPE=STRESS
Replies: 5
Views: 234

[SOLVED but hack is required] *INITIAL CONDITIONS, TYPE=STRESS

Hello, Reading the calculix manual, I found a card that allows to generate residual stresses at the beginning on the simulation. CalculiX CrunchiX USER’S MANUAL version 2.13 (in page 291) 6.11.7 Initial(residual) stresses In each integration point of an element a residual stress tensor can be specif...
by EkaitzEsteban
Thu Oct 11, 2018 3:41 pm
Forum: FEM
Topic: [SOLVED] CLOAD card of .inp file - manually include forces in C3D10 element nodes
Replies: 12
Views: 285

Re: [SOLVED] CLOAD card of .inp file - manually include forces in C3D10 element nodes

bernd wrote:
Thu Oct 11, 2018 2:30 pm
The CLoad is only needed if you would like to apply loads not in the normal direction of the element face.
Ok, good point! got it ;)
by EkaitzEsteban
Thu Oct 11, 2018 2:15 pm
Forum: FEM
Topic: [SOLVED] CLOAD card of .inp file - manually include forces in C3D10 element nodes
Replies: 12
Views: 285

Re: [SOLVED] CLOAD card of .inp file - manually include forces in C3D10 element nodes

EDIT: Calculix assumes this hypothesis? To be honest I'm not that deep at FEM in theory. I used the factors from the bood for a 2nd order element, as it is what CalculiX has. I developed the factors and made a test If you use the Calculix cantilever example from StartWB and load it with a tension f...
by EkaitzEsteban
Thu Oct 11, 2018 2:14 pm
Forum: FEM
Topic: [SOLVED] CLOAD card of .inp file - manually include forces in C3D10 element nodes
Replies: 12
Views: 285

Re: [SOLVED] CLOAD card of .inp file - manually include forces in C3D10 element nodes

The explanation can be found in page 208 from the book G. Lakshmi Narasaiah, Finite Element Analysis: ExplanationForces.PNG The force magnitude is applied equally in the mid-side nodes. EDIT: Calculix assumes this hypothesis? yes Is it necessary to write the values of the nodes placed at the corner...

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