Error in Solving 3d Contact
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10 years 6 months ago - 10 years 6 months ago #7696
by Youssef
Still student in mechnical engineering
Replied by Youssef on topic Error in Solving 3d Contact
Hi everyone,
First, I want to thank you for the help. Previously, I did some modifications based on the claws' advice and they allowed me to understand more about Code_aster and the establishment of contact in the software. Thank you very much;)
Unfortunately, over the last 2 months, I tried to solve my problem alone, but it still remaining (I'm discouraged, I tried everything, even the Code_aster forum was not available to help (registration is closed)
If someone could really help me solve that by checking my model. I attached my files if someone can have a look on them and help me::
Contact_2d.comm
Contact_2d.med
Contact_2d.mess
I appreciate all the advice and comments on the simulation, I really need help
First, I want to thank you for the help. Previously, I did some modifications based on the claws' advice and they allowed me to understand more about Code_aster and the establishment of contact in the software. Thank you very much;)
Unfortunately, over the last 2 months, I tried to solve my problem alone, but it still remaining (I'm discouraged, I tried everything, even the Code_aster forum was not available to help (registration is closed)
If someone could really help me solve that by checking my model. I attached my files if someone can have a look on them and help me::
Contact_2d.comm
Contact_2d.med
Contact_2d.mess
I appreciate all the advice and comments on the simulation, I really need help

Still student in mechnical engineering
Last edit: 10 years 6 months ago by Youssef.
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10 years 6 months ago #7698
by Youssef
Still student in mechnical engineering
Replied by Youssef on topic Error in Solving 3d Contact
Any comments?

Still student in mechnical engineering
- Claus
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10 years 6 months ago #7699
by Claus
Code_Aster release : STA11.4 on OpenSUSE 12.3 64 bits - EDF/Intel version
Replied by Claus on topic Re: Error in Solving 3d Contact
Have you followed the hint in the error message (here translated via google) ?
/C
-> Contact surfaces have moved more than 1% since the last reset.
Or you have not enabled automatic updating in the geometric DEFI_CONTACT order!
(REAC_GEOM = 'AUTOMATIC') or you are using the 'CONTROL'
-> Risk & advice:
Your results may be false, the meshes may be incorrectly matched
and interpenetration may occur.
If you have intentionally neglected the geometric nonlinearity of contact (for reasons
performance), we invite you to visually verify that there is actually
/C
Code_Aster release : STA11.4 on OpenSUSE 12.3 64 bits - EDF/Intel version
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10 years 6 months ago #7700
by Youssef
Still student in mechnical engineering
Replied by Youssef on topic Error in Solving 3d Contact
Yes I followed the hint. I tried other values in REAC_GEOM but the strain was overestimated, there were interpenetration between the compounds and "expansion" of one solid. When I had tried with a lower torque (about 1/1000), the model seems to be good. I'm using (mm , MPa)
I'm a native French
I'm a native French

Still student in mechnical engineering
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10 years 6 months ago #7701
by RichardS
Then you should probably switch to a large displacement/large rotation formulation, currently you are using small displacements and rotations:
SimScale - Engineering Simulation in your browser!
Replied by RichardS on topic Re: Error in Solving 3d Contact
Zaheef wrote: Yes I followed the hint. I tried other values in REAC_GEOM but the strain was overestimated, there were interpenetration between the compounds and "expansion" of one solid. When I had tried with a lower torque (about 1/1000), the model seems to be good. I'm using (mm , MPa)
I'm a native French
Then you should probably switch to a large displacement/large rotation formulation, currently you are using small displacements and rotations:
COMP_ELAS=_F(RELATION='ELAS',
ITER_INTE_MAXI=10,
RESI_INTE_RELA=9.9999999999999995E-07,
[b] DEFORMATION='PETIT'[/b],),
SimScale - Engineering Simulation in your browser!
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10 years 6 months ago - 10 years 6 months ago #7702
by Youssef
Still student in mechnical engineering
Replied by Youssef on topic Re: Error in Solving 3d Contact
Thanks for your advice,
I'm applying a torque in a discrete element which is constrained by LIAISON_SOLIDE in a group of node. Can we apply DEFORMATION='GROT_GDEP' in a Discrete elements? because I red that this element do not support anything apart DEFORMATION='PETIT'.
To apply a torque I used this tutorial: Torque by claws (the second one) but I'm in 2D (C_PLAN) and not in 3D
I'm applying a torque in a discrete element which is constrained by LIAISON_SOLIDE in a group of node. Can we apply DEFORMATION='GROT_GDEP' in a Discrete elements? because I red that this element do not support anything apart DEFORMATION='PETIT'.
To apply a torque I used this tutorial: Torque by claws (the second one) but I'm in 2D (C_PLAN) and not in 3D
Still student in mechnical engineering
Last edit: 10 years 6 months ago by Youssef.
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