Quasi static convergence

kuhlkuhl
Hi all,
I'm having trouble getting a model to convergence with nonlinear static analysis and quasi static activated.
It solves with no problem as a "nonlinear static" analysis if "quasi static" is deactivated and also as a "nonlinear dynamic" analysis.

Convergence fails right away at the beginning.
There are only tie contacts in the model.
Is it typical for quasi static to converge more difficult? Any hints what might help?
Thanks!

Comments

  • SebastianmaklarySebastianmaklary
    If "Quasi static" is deactivated, it will apply loads as a scaling from 0% to 100%. When quasi-static is activated, it will apply loads as they are dependent on the time t, so if your load is not defined as a function of t, it will then try to apply the full load regardless of the timestep. If your load is enough to cause nonlinearities that warrant an iterative solving, then this will cause your analysis to fail as it cannot find a timestep which converges because the load is the same regardless of the timestep.
  • kuhlkuhl
    Ahh, thanks for the explanation, that helps!
  • SebastianmaklarySebastianmaklary
    You're welcome :)
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