I am trying to simulate how much the displacement of a part would result after applying the same pressure over and over again. I tried to use a non-linear static simulation and changing the pressure over time so simulate the changing conditions.

As a result I get the plastic displacement after the first cycle, but there seems to be no more plastic deformation. I am using a natural resin with a known stress-strain-curve for simulation and also tried it with the PE provided in the SolidWorks Database - so I know plastic deformation should occur, according to the occurring stress.

Right now I am using a simplified model, for testing - it is basically a dice with a square hole in it.

In summary I am looking for the displacement after several cycles. I want to start with the conditions from the 2nd cycle after the 1st one finished. I tried a fatigue study too, but I cannot get an displacement as a result, furthermore I am interested in about 100 repetitions and not like 10000, so I guess the fatigue study is not what I am looking for.

I tried solving this problem on my own for quite a bit, so any help, suggestions, input and ideas are very welcomed and appreciated.

P.S.: I attached the diagrams and a picture from the model for clarification

P.P.S.: I applied pressure on the insides of the hole and fixed the model on the backside and partially on the sides (see in attachement)

Greetings,

Andy