contact-convergence problem-Please help me
contact-convergence problem-Please help me
(OP)
Hello
I am modeling an underground opening. the model is composed of three rock layers, the coal layer where i made the opening. This coal is sandwitches between two strong sandstone layers .
There is a contact between the coal layer and the other two sandstone layers. the model is elastic. only 0.64 of the job was completed and i got an error message.
I used job diagnostic tool to check the model i found that the top and the bottom layers penetrate the coal layers. these are the warning messages that i got?
Displacement increment for contact is too big.
Displacement increment for contact is too big.
Excessive distortion at a total of 35 integration points in solid (continuum) elements
Excessive distortion at a total of 2 integration points in solid (continuum) elements
Excessive distortion at a total of 2 integration points in solid (continuum) elements
Displacement increment for contact is too big.
Excessive distortion at a total of 27 integration points in solid (continuum) elements
Displacement increment for contact is too big.
Excessive distortion at a total of 131 integration points in solid (continuum) elements.
please help me.
Thanks
I am modeling an underground opening. the model is composed of three rock layers, the coal layer where i made the opening. This coal is sandwitches between two strong sandstone layers .
There is a contact between the coal layer and the other two sandstone layers. the model is elastic. only 0.64 of the job was completed and i got an error message.
I used job diagnostic tool to check the model i found that the top and the bottom layers penetrate the coal layers. these are the warning messages that i got?
Displacement increment for contact is too big.
Displacement increment for contact is too big.
Excessive distortion at a total of 35 integration points in solid (continuum) elements
Excessive distortion at a total of 2 integration points in solid (continuum) elements
Excessive distortion at a total of 2 integration points in solid (continuum) elements
Displacement increment for contact is too big.
Excessive distortion at a total of 27 integration points in solid (continuum) elements
Displacement increment for contact is too big.
Excessive distortion at a total of 131 integration points in solid (continuum) elements.
please help me.
Thanks





RE: contact-convergence problem-Please help me
RE: contact-convergence problem-Please help me
1- apply the stabilize and fail to apply dummy displacement to push the surface together.
2- apply the automatic stabilization.
Sorry if i ask you for more explanation, sometimes when i read the manual i can not understand, so your explanation is highly appreciated.
Thank you.
RE: contact-convergence problem-Please help me
I added a dummy step before the main step, i did not apply load in that step, it is just to force the surface to be in contact. Correct?
I used *contact control and enhanced mesh to overcome the distortion. the model reaches equilibrium, thank you.
However i see that the master surface penetrate the slave surface. This affect the model results, do you how can i eliminate that penetration. i tried very fine mesh, but it did not work.
Your advice is highly appreciated.
Thanks.
RE: contact-convergence problem-Please help me
RE: contact-convergence problem-Please help me
I do not know how to swap the master and slave surface? could you please explain more? Thanks