I'm not quite sure what the problem with your model is. I created a test case with pretty much the same INISTATE commands you used:
There are no externally applied loads in my model (just constraints). I get significantly nonzero stresses:
The initial stresses are listed in the solve.out file by the INISTATE,LIST command:
If I comment out the commands in the command object and rerun, I see (as expected) zero stress:
Maybe your constraints only prevent rigid body motion? Maybe you can do some testing without additional applied pressures (as I did) to help you identify the problem?
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