Solution not converged

hooshsim

Ran an blade assembly model having contact surfaces. Solution completed without any error messages and have reasonable deflection values but no von-misses results. What causes this? Thanks in advanced

Victor

There are lots of ways for convergence failure to happen, and unfortunately it's quite common with contact. Here are some general ideas:

Run it as Quasi-static (in Analysis settings) and ramp all the loads using formulas (eg. 3*t instead of 3). That can reveal unexpected deformations before it fails.

Are all the parts fully constrained when ignoring contacts? You can't rely on contacts to prevent rigid body motion at the first time step.

There can also be severe deformation of elements or strange contact penetration problems if you have large strains and contact with sharp corners such as in deep-drawing or with hyperelastic materials. Again, ramped loads help to identify this.

Delete features and mesh parts until it converges to isolate what part caused the failure.