Chattering classes
Chattering classes
(OP)
In a contact analsysis the results show 1 node opening and closing with no convergence of the results (so-called chattering). I've tried automatic tolerances, didn't work, I've tried setting maxchp=2,uerrmx=0.01, didn't work, I've tried using a soft exponential contact, didn't work, I've tried combinations of the 3, didn't work.
Any ideas on how to get convergence?
Any ideas on how to get convergence?





RE: Chattering classes
Try *STATIC, STABILIZE in conjunction with the *CONTACT CONTROLS, AUTOMATIC TOLERANCES option, this has helped me in the past. If you have access to bersion 6.4, I have had some success with the new Augmented Lagrangian algorithm with models that had difficulty converging in 6.3 (this can be invoked with the following in the surface interaction definition:
*SURFACE BEHAVIOR, AUGMENTED LAGRANGE
Barry
RE: Chattering classes
corus