Altair RISE

I believe this is caused by using the imposed displacement. If you differentiate your imposed displacement curve you will get a non-zero velocity curve at T=0. Thus RADIOSS has to apply a force to get that initial velocity. You could try an imposed velocity and see if that gives you the zero force at t=0. If not and you have contact then maybe the issue is initial penetrations.

Usually the initial force caused by imposed displacements does not change the results later in the simulation as compared to using an imposed velocity.

Karthic_22061

Hi,

Try increasing the initial gap b/w the parts, also check for penetrations.

Try slow load rate initially

Nachiket Kadu_22143

Hi @Ganesh Munge

I assume the same nature of kinetic energy as in your previous post. If that is the case u need to make kinetic energy as low as possible by gradual loading.

Altair Forum User

thanks @Nachiket Kadu, it is sorted out with gradual loading.