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Unable to solve with frictional contact condition – Unable to converge

    • Joyceline Kurniawan
      Subscriber

      I am doing a static structural analysis with a bone plate and bone. However, it cannot be solved when the friction is set to be 0.3, saying it is higher than 0.2. But when i tried to solve with friction 0.1, the error said it is unable to converge. I have also tried to make the mesh more detailed, but still no improvement. so far i can only solve when the contact condition is set to be bonded. Any suggestion to make it solveable using the frictional contact condition?

    • Akshay Maniyar
      Ansys Employee

      Hi @Joyceline,

      Convergence can be very tricky to solve. It will be very difficult to find the exact issue without seeing the model. From the warning messages, it looks like the contact status is changing abruptly. You can try to increse number of substeps and apply load more gradually. Also, try using unsymmetric Newton-Raphson option as you have high coefficient of friction.

      Also, you can try following remedies to resolve the convergene issue.

      – Adjust the Contact Stiffness
      – Check for proper initial conditions/pinball.
      – Change to nodal detection if the problem is at a corner

      Thanks,

      Akshay Maniyar

       

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