• From: KU Leuven
  • Registered: 05-02-2015
  • Posts: 46

Re: Contact element implementation

Hello,

I just want to follow up on my questions here :-) Since my solution with an implicit solver does not converge.

Is there new advances in the solvers that can fix the problem? I've seen that a new StaticStructral is introduced, should I give it another try?

Explicit solver can solve the issue of unconvergence, as I do in Abaqus? Is there any new or old availables solvers for the problem at a hand? I added the input file in the attachemnt.

Thanks in advance for your remarks.

Vitalii

Post's attachments

tutorial_material_ls.in 1.11 kb, 2 downloads since 2017-02-14 

You don't have the permssions to download the attachments of this post.

52 Reply by bp

  • bp
  • Administrator
  • Offline
  • From: Prague, Czech Rep.
  • Registered: 02-03-2007
  • Posts: 1,026

Re: Contact element implementation

Hi,

there is no new progress in the solvers. Hard to say, what can be wrong, but in general, there can be several sources of the problem:
1) if you use tangent stiffness, your internal force (stress) evaluation is not consistent with stiffness matrix evaluation (stifness is not consistently linearized). You may try to use secant stiffness or set "marnrmsteps" to a larger value.
2)  You control the solution by a load increment. Dont't know, but is the load monotonically increasing? Perhaps you can try some form of displacement control.

bp's Website