MoverZ,
I think DAF=2 is not the worst case. It could be 1,2,3,4 and more.
It's classic problem for body falling down on elastic beam. DAF=2.0 when H=0
DAF=1+sqr(1+2*H/D)
H - height from what the body is falling from
D - static deflection
If D=0 we have DAF=Infinity (when infinite rigid body falling at infinite rigid surface)
If we have Velocity:
DAF=1+V/sqr(g*D)
V - velocity of falling body
For horizontal impact:
DAF=V/sqr(g*D)
So to calculate DAF you have to know static deflection of support D. I think H=gap value
You can look the pictures here (It's in Russian, sorry):
http://mysopromat.ru/uchebnye_kursy/sopromat/udar/vertikalnyi_udar/http://mysopromat.ru/uchebnye_kursy/sopromat/udar/vertikalnyi_udar_vsledstvie_ostanovki_dvizheniya/http://mysopromat.ru/uchebnye_kursy/sopromat/udar/gorizontalnyi_udar/
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