The following link will take you to a PDF of Chapter 4 from my forthcoming book on RECONSTRUCTING ROLLOVER CRASHES, which I'm developing as a part of the course I teach on this topic. This chapter covers non-constant deceleration rate approaches to the roll phase. If you take the time to read any part of this, I would much appreciate any feedback you would be willing to give me - the good, the bad, and the ugly. My email address is email@example.com or feel free to leave comments on LinkedIn. Thanks!
If you would like to sign up for my course: http://training.sae.org/seminars/c1502/