I am a student of Continuum Mechanics and I have to do my master thesis, I want to do a contact simulation in disc brake. As shown on the Comsol website.
Please help me reproduce similar results. I want the disc to rotate.
Thank you
Hello,
how can we help you?
there should an example in the manual!?
i have there an example, but i don’t if these is usefull for you:
rotating_ring_2D_plane-element.fbd
##
## Structure: ring
## Test objective: rotating ring & axisymmetric stress
PNT p0 0.00000 0.00000 0.00000
PNT P001 100.00000 0.00000 0.00000
PNT P002 0.00000 100.00000 0.00000
PNT P003 0.00000 50.00000 0.00000
PNT P004 50.00000 0.00000 0.00000
PNT P005 -100.00000 0.00000 0.00000
PNT P006 -50.00000 0.00000 0.00000
PNT P007 0.00000 -100.00000 0.00000
PNT P008 0.00000 -50.00000 0.00000
LINE L001 P004 P001
LINE L002 P001 P002 p0
LINE L003 P002 P003
LINE L004 P003 P004 p0
LINE L005 P002 P005 p0
LINE L006 P005 P006
LINE L007 P006 P003 p0
LINE L008 P005 P007 p0
LINE L009 P007 P008
LINE L010 P008 P006 p0
LINE L011 P007 P001 p0
LINE L012 P004 P008 p0
GSUR A001 - BLEND + L004 + L001 + L002 + L003
GSUR A002 + BLEND + L003 - L007 - L006 - L005
GSUR A003 - BLEND - L006 + L008 + L009 + L010
GSUR A004 - BLEND - L009 + L011 - L001 + L012
SETA ldivr l L001 L003 L006 L009
COMP ldivr d
SETA ldivt l L002 L004 L005 L007 L008 L010 L011 L012
COMP ldivt d
flip all
DIV ldivr mult 20
DIV ldivt mult 20
ELTY all QU4S
MESH all
send all abq
plot e all
rotating_ring_2D_plane_element.inp
**
** Structure: ring
** Test objective: rotating ring & axisymmetric stress
** radial displ ri 1624 ro 1425 tang. stress 6820 rad stress (ANSYS 799734)
*HEADING
Model: rotation ring
*INCLUDE, INPUT=all.msh
*TRANSFORM,TYPE=C,NSET=Nall
0,0,0,0,0,1
*ORIENTATION,NAME=OR1,SYSTEM=CYLINDRICAL
0.,0.,0.,0.,0.,1.0
*BOUNDARY
Nall,2,2,0
*MATERIAL,NAME=Steel
*ELASTIC
210000,0.3
*DENSITY
78.5
*SOLID SECTION, Elset=Eall, Material=steel,ORIENTATION=OR1
*STEP
*STATIC
*DLOAD
Eall,CENTRIF,10,0,0,0,0,0,1
*NODE FILE,OUTPUT=3D ,GLOBAL=NO
U,
*EL FILE,GLOBAL=NO
S, SED
*END STEP
It should be possible to simulate that in CalculiX and might be even easier to realize than in COMSOL since you don’t have to imitate motion in pure heat transfer analysis like they do, you can actually simulate that motion using thermal stress analysis. So you will need transient coupled temp-disp simulation and *GAP HEAT GENERATION to include frictional heat generation.
This example from Abaqus documentation can help you since CalculiX uses very similar (mostly the same) keyword syntax: https://classes.engineering.wustl.edu/2009/spring/mase5513/abaqus/docs/v6.6/books/exa/default.htm?startat=ch05s01aex102.html
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Thank you very much I will try it.
Thank you very much. I am reading about it. I will first start with meshing using Salome and then use Calculix launcher. Please, I hope you will guide me step by step.
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I recreated the model from Abaqus documentation for use in CalculiX (with some modifications to make it work in ccx). Unfortunately, it doesn’t fully converge yet - the pad starts deforming too much, maybe because of too coarse mesh (but that’s the one they used in Abaqus) or unavoidable differences between Abaqus and CalculiX analysis. However, you can see some rotation with heat being generated and it can be a good starting point.
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Thank you very much this is really amazing.
Depending on your final goal and point of interest you could also change your reference system and use a rotating heat source.
That would be a real hassle, but if you get it, your thesis supervisor would be pretty freaked out searching for the brake. 
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