Learning Forum

[Subash K]

Hi,

In my problem, this is the Force Convergence plot which im getting, I understand that the Force Convergence < Force Criterion for the equlibrium iteration. But in the below attached graph, @ many places even when Force Convergence< Force criterion,i'm not getting "substep converged" result !. Help is appreciated;

 

[peteroznewman]

The solver checks many more metrics than Force before it converges on a substep. You need to look in the Solution Output file and read the messages to know what to do to fix the problem.

[Subash K]

Hi peteroznewman, 

It seems the contact point status change need to be zero along with satisfying the Force convergence & Displacment convergence criterion. 

Is there any way i see contact point status change as a plot in the solution output?

[peteroznewman]

Edit the Contact, in the Details window is a Normal Stiffness, change that to Factor and enter a 0.1 value. A value less that 1.0 will soften the contact and reduce the "chatter" that is occuring on your contact, which is probably too stiff.  You can try a value of 0.01 if necessary.

There is another setting which is to Update Stiffness, set that to Each Iteration.

[Subash K]

Thanks for the info. However i'm going with the Normal Largrange formulation for the simulation. I have got my simulation get converged. Adjusted the time increment size, now it worked, but as expected took lot of iteration & time.