Hello everyone,
for context: I'm investigating a polyamide lattice cube in quasi-static compression (10 seconds and more). Since the findings will be later transferred to another explicit model in Radioss, the best case would be to perform it with its implicit capabilities. The model works well with the explicit Radioss solver, but it is performed at high speed (0.01s total time) to reduce the run time and is thus not applicable.
So the problem I have is twofold: the contact options are limited in with the implicit Radioss solver, and I don't seem to have the right settings as the time step gets reduced further and further until the simulation is stopped. The cube is to be compressed by a plate meshed via shell elements, but since the lattice consists of beam elements, I converted the shell elements edges to beam elements, too. This way, the TYPE11 contact can be used, but it's unstable as mentioned. I tried using the beam elements as they are in the contact definition, or by using line segments.
As I could not get it to work with Radioss, I retried the model with Optistruct only to find that the contact does not seem to be possible between shell and beam elements. Is there a workaround to this? Is the contact definition possible between two sets of beam elements?
I attached both models, and hopefully someone may be able to guide me through these problems.
