Mechanical properties calculations

Hi all,

I wish to calculate the young's modulus of an amorphous polymer with periodic boundary conditions.  What is the different if I do with the 'Discover' and 'Forcite Plus' modules?  I have noticed that there are several methods in calculating the young's modulus from MD, the statics, dynamics and fluctuation.  In using the 'Discover', am I using the 'Static' methods?  And while I used the 'Forcite Plus', which method I am using?  What is input and procedure for each module.  Thanks a lot for the information and comment.

Best regards,

Cell