Learning Forum

[Ikram.MARZOUKI]

Hi everyone,
Here’s what I’ve observed in the simulation:

I am testing a sandwich panel modeled with solid elements (SOLID) in a 3-point bending setup. The supports are cylinders, and I applied Remote Displacement to impose their translation.

When I set the contact between the cylinders and the sandwich as “totally bonded”, the simulation works even for relatively large displacements (e.g., 10 mm).

However, when I switch to contact with friction, the simulation only converges for small displacements. Beyond about 8 mm, it diverges.

I have added photos showing:

• the case when the simulation diverges

• the case when it converges

• how I defined the contacts

Could someone advise what parameters I should modify to make the simulation converge for larger displacements with contact and friction?

 

[ErKo]

 

 

 

 

 

Hello

For this I recommend using 1/4 symmetry (as used here in this paper: Modeling Flexural Failure in Carbon-Fiber-Reinforced Polymer Composites) – as it is unstable.

Then when that is done, look on maximum substeps and general nonlinear convergence (say adjust to touch, normal stiffness,etc.):

https://www.youtube.com/watch?v=O-qTAiE8Kdo&msockid=8b77ec91c91e11f0a1f421c682991185

https://www.youtube.com/watch?v=sZf5p_evqOk

 

Few videos out there that should help.

All the best

Erik