Impact Load vs "Gradual load" deflection?
Impact Load vs "Gradual load" deflection?
(OP)
Hello,
Assume the end of a cantilever beam is impacted with a quick shock load of 100 lbf and deflects x inches. If this load was very gradually applied at the same location with the same impact area would the deflection be the same if the very slowly rising gradual load reached 100 lbf as well?
Does the "speed" of the load application affect the deflection of the beam if the measured force and force area remain constant?
Thanks!
Assume the end of a cantilever beam is impacted with a quick shock load of 100 lbf and deflects x inches. If this load was very gradually applied at the same location with the same impact area would the deflection be the same if the very slowly rising gradual load reached 100 lbf as well?
Does the "speed" of the load application affect the deflection of the beam if the measured force and force area remain constant?
Thanks!






RE: Impact Load vs "Gradual load" deflection?
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RE: Impact Load vs "Gradual load" deflection?
No.
Yes.
RE: Impact Load vs "Gradual load" deflection?
If the resulting FORCE from F=ma were applied as impact, the force is just the force, whether static or not.
At least that's my first thought on this. Force simply produces deflection "x" whether it is from a larger static WEIGHT or a smaller weight creating a same FORCE through deceleration.
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RE: Impact Load vs "Gradual load" deflection?
RE: Impact Load vs "Gradual load" deflection?
A gradual or static load would be just the 100 pounds force sitting politely on the end of the cantilever, whereas the impact load implies the added Kinetic Energy of 100 pounds force stopping over a certain finite distance.
JAE has it right.
Mike McCann, PE, SE (WA)
RE: Impact Load vs "Gradual load" deflection?
With the quick shock load, part of the resistance to the load is from elasticity of the beam, part of it is due to inertia of the beam, so the deflection in the dynamic case could be considerably lower for a given force.
RE: Impact Load vs "Gradual load" deflection?
RE: Impact Load vs "Gradual load" deflection?
Cheers
Greg Locock
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