acoustics – Modeling acoustoelastic effect in COMSOL Multiphysics

I need to model acoustoelastic effect (change of acoustic wave velocity under stress-strain) in COMSOL Multiphysics. I use 2 step solver: 1st is stationary for applying load, and second is time dependent to generate acoustic wave.
I don’t know what am i doing wrong, but when i try to extract velocities, they are exactly the same regardless of load, yet stress along the wave propagation reaching 600 GPa.
How do i correctly model the acoustoelactic effect for second step. How to correctly apply solutions of first stationary step to second time dependent?

I tried to have 2 steps in COMSOL solver: 1 stationary for applying load, second is time dependent to generate acoustic wave. But i think i don’t properly transfer solution from first step to second