I want to check the behavior of a plate with an initial stress, but the result is not what I expect.
The idea is to apply a uniform pressure on a plate fixed on the right corner during a dynamic calculation.
Then I save the new deformed mesh and the stress at the last iteration, I run a new simulation with this mesh and this stress as initial condition but without any pressure.
If I do this new simulation in STATIC with the NLGEOM solver,the plate almost goes back to the initial state but there is still a gap about the value of displacement.
When I check the stress in the _main.dat, strangely the stress in the element change a little but doesn’t tend to zero during the calculation.
If I do the same in DYNAMIC, the time step decrease and the plate doesn’t go back at all to its original flat shape (I stopped the calculation after 1 day).
For me, in both cases the plate should go back naturally to a the original shape in order to cancel the initial stress?
For information, I apply the initial stress by using “*INCLUDE, INPUT=add_stress.inp” in my _main.inp with add_stress.inp the file containing the stress during the last iteration of the first calculation.
I appreciate any hints