October 18, 2023 at 9:36 amPrzemysław OborowskiSubscriber
TAGS: #membrane, #fabric, #contact, #nonlinear, #hyperelastic, #rubber, #Mooney, #Rivlin, #axisymmetric, #2D
I'm trying to do the 2D axisymmetric simulation of the membrane shown in the picture below:
The simulation is divided in 2 steps
1. 0-0.5s -> initial pressing bu the contacts (ramped effect)
2. 0.5s-1.5s -> Yellow element displacement for 0.7mm down, which squezes the membrane further.
Here is a mesh used in the last trial (TRI6, QUAD 4), but I've already tried multiple variants of meshing:
The problem occurs around 1.33s/1.5s and it seems, that it is connected to the nodes sticking to the rigid surface.
More movies available under the link:
The contact is defined as below (place, where the the possible problem occured, marked with arrow):
Could You please help me in this issue? :)
Thank You in advance for support!
October 20, 2023 at 1:40 pmJohn DoyleAnsys Employee
Below are a few tips to try:
- Drop midside nodes. The linear shape functions can sometimes offer better stability.
- Consider a coarser mesh. Not too coarse, but slighly larger elements might be less suceptible to element distortion errors, since their integration points are not so close to the boundary.
- Switch back to Aug Lagrange and reduce the contact stiffness.
- Use many more substeps.
- If the above tips do not help, consider adding Nonlinear Adaptive Meshing.
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