screw torque/clamping pressure
screw torque/clamping pressure
(OP)
Hello,
The problem I am having is this:
I have a 3"x3" soft aluminum plate clamped on each corner with a screw. I need to know how to find the pressure the plate is transfering to the surface below.
If anyone has any hints on how to do this I would appreciate it.
Thanks,
The problem I am having is this:
I have a 3"x3" soft aluminum plate clamped on each corner with a screw. I need to know how to find the pressure the plate is transfering to the surface below.
If anyone has any hints on how to do this I would appreciate it.
Thanks,





RE: screw torque/clamping pressure
Assume the force spreads out from the screw head into the Al plate with a 30 degree angle. This means the effective diameter d2 under the Al plate is:
d2 = d1 + (2t)/√3
Then
p = F/A
where
A = (π·d22)/4
RE: screw torque/clamping pressure
How accurate do you have to be?
You have not indicated the size of the screw, or the specified torque. I have seen literature on how to predict how people will install fasteners without a specified screw torque, but boy is it approximate!
Even the standard screw torque methods are approximate.
JHG