energy from crush deflection(indentation)
energy from crush deflection(indentation)
(OP)
I'm trying to determine to energy absorbed by the end of a log impacting a stationary object.
by conservation of energy: Ein = Elog + Eobject +Ecrush
Ein =.5mv^2
Elog = .5mv^2 (assumed as zero, impact comes to a stop)
Eobject = .5kx^2 (spring constant determined from force on the object(cantilever beam))
How do I determine the crush energy??
The log is traveling horizontally at 300fpm, weighs 3500 lbs, and is 25inches in diameter. The estimated are of contact is maybe 3% the area of the log end.
by conservation of energy: Ein = Elog + Eobject +Ecrush
Ein =.5mv^2
Elog = .5mv^2 (assumed as zero, impact comes to a stop)
Eobject = .5kx^2 (spring constant determined from force on the object(cantilever beam))
How do I determine the crush energy??
The log is traveling horizontally at 300fpm, weighs 3500 lbs, and is 25inches in diameter. The estimated are of contact is maybe 3% the area of the log end.





RE: energy from crush deflection(indentation)
If on the other hand the log is pounching a hole in the plate then it is easier, as the military know a lot about it, and more difficult becasue the beahviour of a hardened steel sheel is unlikely to be the same as a lump of wood.
Cheers
Greg Locock
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RE: energy from crush deflection(indentation)
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: energy from crush deflection(indentation)
then you also have lost energy (noise ?)