Impact Deceleration
Impact Deceleration
(OP)
I am trying to determine the net impact force for a falling object has (8x10 structural frame)from 2 inches off of the ground. I know the mass of the frame and I can calculate the energy balance if I can determine the deceleration time.
Is there any published data / constants that can relate the falling velocity & weight of an object to its deceleration time when impacted against a particular material (say wood or concrete)?
May frame is about 5,000 lbs and will be dropped onto a wooden deck. This could also be assumed rigid for simplicity's sake. I am stuck when trying to determine with the deceleration time will be?
Thank you in advance for your help!
Is there any published data / constants that can relate the falling velocity & weight of an object to its deceleration time when impacted against a particular material (say wood or concrete)?
May frame is about 5,000 lbs and will be dropped onto a wooden deck. This could also be assumed rigid for simplicity's sake. I am stuck when trying to determine with the deceleration time will be?
Thank you in advance for your help!





RE: Impact Deceleration
Could you make some reasonable assumptions about the stiffness of the deck, then treat it as a simple harmonic motion problem?
A.
RE: Impact Deceleration
TTFN
I can do absolutely anything. I'm an expert!
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: Impact Deceleration
Ted
RE: Impact Deceleration
What is missing, of course, is that the inertia of the platform will not allow it to move as much as the weight might at rest, but you can also assume the deflection will be only of the wood fibers. Some or much of the energy will go into making wood pulp.
If everything is rigid then the time is 0 and the acceleration is infinite, so you need to guess somewhere.