Q: Thanks for the reply. I appreciate all the information posted on your website. If I read the ECF information correctly, there is no limit on the Alpha angle. However, the maximum ECF is limited to 2.0. So if the angle produces an ECF greater than 2.0, use 2.0 in the crush formula. I believe I understand this means to use “2” (max) if the alpha angle relative to the vehicle surface is equal to or greater than 45-degrees. Correct? Trying to make sense as there seems to be a difference.
A: Yes, the ECF is limited to 2 for maximum correction factor. The value of 2.0 is somewhat arbitrary 'maximum' and we have published some additional discussion on the whole ‘ECF’ concept however I don’t currently have that handy while on the road. I will try to remember to post once i return to the office (please rattle my cage if i don't!).
is the generally accepted technique and on which most, if not all, Damage Analysis techniques are based, I’d suggest you familiarize yourself with the concepts of CRASH3.
I believe Daily in his book is merely presenting the CRASH3
formulation with slightly different nomenclature. If he presents something different let me know (currently I do not have his book with me)
On a related topic, if you are working with Damage Analysis we recently covered a related topic on our forum, which also refers to the book by Daily: