Static friction between beams with pretension

Altair Forum User
Altair Forum User
Altair Employee
edited November 2020 in Community Q&A

Hello,

 

I have two square beams in contact. I define master and slave surfaces and impose static friction (mu=0.3) between them with S2S discretization.

 

The loading is pretension through rod elements (modeling a bolt) and I use inertial relief since there are no constraints. I'm using a nonlinear quasi-static solver.

 

I get the following error message.

 

A fatal error has occurred during computations:

  *** ERROR # 941 ***
  NON-CONVERGENT NONLINEAR ITERATIONS FOR SUBCASE 1

  Suggestions:
  * Friction or STICK can cause more difficult nonlinear convergence - if feasible
    try frictionless gap/contact.
  * This problem has gap elements with friction or stick condition. For more
    intuitive results and often better convergence, set GAPOFFS on GAPPRM card
    to AUTO. (This may violate rigid body balance, especially for unsupported
  ...

 *** PROGRAM STOPPED: FATAL ERROR(s) ENCOUNTERED.

 

How can I resolve this?I

 

attached the full error message and .out file for your reference.

 

Thanks,

 

Matt

Unable to find an attachment - read this blog

Tagged:

Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2017

    Hi @mfronk

     

    Could you please try if the simulation converges without friction?

     

    If this works, we need to figure out a different approach with friction maybe run a NLGEOM analysis. 

     

    If possible, please share the model files.

Categories