Cylindrical contact Input file

[Phempet]

Dear Admin,

Please I am having some challenges getting this contact input file to properly solve.

Please I need your help.

Thank you.

[FEAP_Admin]

What version of FEAP are you using?

[FEAP_Admin]

The output file and the log file in ver8.6 both say that you contact surface 1 was not detected.  Probably you are traversing the surface in the incorrect direction?  Clockwise vs counter-clockwise? 

If you can not figure it out, please post a drawing with dimensions and coordinate frame labeled.

Also, please double check your boundary conditions, they look a bit odd with rollers in the middle of the lower piece of material.

[FEAP_Admin]

Also, you should change your tie, to be TIE MATE 1 1 so that you are only tying together your indenter.

[Phempet]

The output file and the log file in ver8.6 both say that you contact surface 1 was not detected.  Probably you are traversing the surface in the incorrect direction?  Clockwise vs counter-clockwise? 

If you can not figure it out, please post a drawing with dimensions and coordinate frame labeled.

Also, please double check your boundary conditions, they look a bit odd with rollers in the middle of the lower piece of material.

Dear Admin,

Thank you very much for your response.

I have attached a sample setup with dimensions.

Best regards.

[FEAP_Admin]

Your input file is pretty complicated for this simple geometry.  Why the use of all the transformations?
When I look at your boundary conditions they also confuse me.  What are the boundary conditions you want?
Attached is an image that shows the boundary codes.

[Phempet]

Thank you very much Professor.

I wanted a roller on the left and bottom of the block.

I am very grateful sir.

Thank you.

[Phempet]

Your input file is pretty complicated for this simple geometry.  Why the use of all the transformations?
When I look at your boundary conditions they also confuse me.  What are the boundary conditions you want?
Attached is an image that shows the boundary codes.

I am very grateful.

Boundary conditions: Put the block on a roller on the left and bottom
The target is to be able to apply both normal and tangential load on the indenter.

Thank you very much.

[FEAP_Admin]

Here is an input file for the problem you are trying to solve.  You will need to adjust the properties, dimensions, etc. for what you want to do but this should get you started.

[Phempet]

Thank you very much for your help, Prof. you have saved us a lot of time and gave us better understanding of the problem.

God bless you.

[Phempet]

Dear Admin,

Please I have a further about this contact setup. It does seem that the deform edges does not align with the shape of the indenter.
I have attached few images to illustrate the problem. Please, how can I resolve this?

Thank you very much.

[Prof. R.L. Taylor]

I do not know how you solved such a large displacement but with some changes to the input file I was able to get a solution that looked reasonable.

Friction is difficult to solve and may take more changes. to get a good solution -- if it is even possible.

[Phempet]

Dear Prof. Taylor,

Thank you very much for the help.

The displacement in the code is hypothetical. The actual system will require a much smaller displacement.

Please what are your recommendations in solving a frictional contact? What do you recommend that I tweak in the code to ensure reliable solutions. 

Thank you.

Best regards.

[Prof. S. Govindjee]

Is there a reason that you do not want to use a fully rigid indenter?  I wonder if that will make the problem easier and lead to better results.

[Phempet]

Dear Prof. Taylor,

I could use a rigid indenter. It is not important that I use a deformable indenter.

Thank you, sir.