Screws: Shear vs. bending vs..... pullout??
 

Awl --

If you screw a screw tight to a plate connecting to a base plate, it is
more-or-less in pure shear (no bending moment, unless the screw is
cantilevered).

What is the pullout/thread stripping process called? And actually, those
two processes would be distinct as well, correct?
Do they have proper names, or is pullout and thread stripping close enough?
--
EA

Screws: Shear vs. bending vs..... pullout??
 

"Steve W." wrote in message
...
Existential Angst wrote:
Awl --

If you screw a screw tight to a plate connecting to a base plate, it is
more-or-less in pure shear (no bending moment, unless the screw is
cantilevered).
What is the pullout/thread stripping process called? And actually, those
two processes would be distinct as well, correct?
Do they have proper names, or is pullout and thread stripping close
enough?



http://www.appliedbolting.com/pdf/yielding.pdf
http://school.mech.uwa.edu.au/~dwrig.../home.html#top
http://www.boltscience.com/index.htm
http://www.roymech.co.uk/Useful_Tabl...reloading.html


Dayum..... I shoulda stayed in school..... LOL

So what's the diff between "tightening" a g-d screw, and "pre-tensioning"
it??
--
EA


--
Steve W.

Screws: Shear vs. bending vs..... pullout??
 

On May 14, 10:18*pm, "Existential Angst" wrote:


So what's the diff between "tightening" a g-d screw, and "pre-tensioning"
it??
--
EA

If you need to get all the strength you can from bolts, then you use
some system that allows you to accurately know the bolts are correctly
tensioned. Torque wrenches are better than nothing, but you can use
things as belleville washers and be more accurate.

Dan

Screws: Shear vs. bending vs..... pullout??
 

"Existential Angst" wrote in message
...
... So what's the diff between "tightening" a g-d screw, and
"pre-tensioning" it??
--
EA

You tighten to a head torque, pretension to a stress level in the bolt
shank and threads which can be measured as elongation if both ends are
accessible. The difference is compensating for friction.

jsw