Learning Forum

[sebastian94]

Hey there

I´m trying to modell a tensil test of a pin-joint but every time it occurs convergence difficulties. I have used different settings (load steps, substeps) so far but I didn´t find the right one. Can anyone please help me to find the right setting? Are there also any other mistakes which causes the problem?

I´m using ANSYS 19.2.

Thanks a lot!

Regards,

Sebastian

[Wenlong]

Hello Sebastian,

Ansys staff cannot download attachments from the student community, so in order to get a faster and wider response, please kindly insert images of your model setup (like BC, analysis settings, contact definition, etc) and error messages (or last available deformed shapes). 

Thanks,

Regards,

Wenlong

 

 

[sebastian94]

Hello Wenlong,

Thanks for your response!

This are the latest error messages:

There are also other elements has become highly distored.

Now some details of my modell setup:

I created as "Static Structural" a tensil test of a pin-joint and I defined a "Frictionless Support", "Fixed Support" and a "Displacement" (0,25 mm) in x-direction.

          

I meshed the pin-area with "Sweep-Method" and created parts to merge the nodes.

 

The pin-part is aluminium alloy with a plasticity define by "Bilinear isotropic hardening" and the other part is a composite material, define by "Orthotropic Elasticity".

The type of the contact region is "Frictional" with 0,2 for the friction coefficient.

I was using this "Analysis Settings":

The Solver was running 31,5 h and stopped, because of convergence difficulties.

What should I do next to get a convergence? Improving the mesh? Using other settings? I have no feeling for a good number of substeps so far, furthermore I have to reduce the solver time.

Thanks a lot!

Regards,

Sebastian

[sebastian94]

I want to add some current results, until the error:

[Wenlong]

Hi,

First I would suggest you use a relatively coarse mesh, so it will be easier for you to debug. After your model converges, you can refine the mesh for more accuracy.

Second, for the contact between the pin and hole, please try the following and see if it works.

Regards,

Wenlong