Help on a problem about steel ball on top of a rubber materials simulation
I am trying to simulate a steel ball on top of a rubber materials (hydrogel/gel) simulation on APDL and I have a couple of questions, or perhaps someone could guide me on what to do.
What I am trying to simulate deformation of rubber materials in which the steel ball is put on top of a hydrogel/gel that is made up of elastomers (PDMS, PDMS/PEG, Natural Rubber, etc). The idea is that as time goes by the steel ball will deform the hydrogel and the hydrogel experiences creep. I've done preliminary runs and I set up a Mooney-Rivlin model for the rubber materials and I set the steel ball to be elastic linear isotropic.
In my first run, I applied structural displacements and then I did load steps opts and write LS files (The result of my displacement is shown in the picture. However, I think it is important to add the weights of my objects. My first question is, how do you add the weights of your objects? Secondly, Do I need to?
How do I simulate creep? What do you guys think? Any tutorials/books do you recommend?