How to change time step size during a transient analysis simulation

[vinny31]

Hi

I am doing a very simple transient mechanical analysis with the time stepping parameters as follows (See below).

I wish to change the size of the time step (dt) from 0.01us to 0.05 us when Timef reaches 1.0us during the run!
Can you suggest how to do this?

Regards
V

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Time Stepping Parameters!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

dt = 0.01 ! Time step size
idt = dt ! Initial time step size
twait = 0.0 ! Wait time before sim begins
timep = 0.1 ! Pulse duration
timem = 5.0 ! Time simulation continues after pulse
timef = timem+timep+twait ! Total simulation time
nt = (timef-0.1*dt1)/dt1+1 ! number of time steps
ndt = 10000