Hello,

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 doesnâ€™t tend to zero during the calculation.

If I do the same in DYNAMIC, the time step decrease and the plate doesnâ€™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 â€ś*INCLUDE, INPUT=add_stress.inpâ€ť 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