Calculating hoop stress in threaded fasteners
Calculating hoop stress in threaded fasteners
(OP)
Does anyone know of a way to calculate the hoop stress generated by torquing fasteners? I am working on a design where OD of my fastener is critical and I would like to make it as small as possible but I don't have a good feel for what the hoop stresses will be like.





RE: Calculating hoop stress in threaded fasteners
Not sure from your post whether you really need hoop stress, normally during tightening of a bolt you get tension and shear stresses.
Have a look at this site:-
h
desertfox
RE: Calculating hoop stress in threaded fasteners
Torque on a bolt produces tension in the shaft and shear on the threads.
RE: Calculating hoop stress in threaded fasteners
RE: Calculating hoop stress in threaded fasteners
The shear stresses that Ron and I are refering to are those due to torsion during tightening,
desertfox
RE: Calculating hoop stress in threaded fasteners
However this will never be limiting unless it is a custom bolt designed to fail before the threads.
RE: Calculating hoop stress in threaded fasteners
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Calculating hoop stress in threaded fasteners
RE: Calculating hoop stress in threaded fasteners
(F*tan(thread angle/2))/(l*(D-d))
where F = fastener load, l = length of internal threaded nut, D = outside diameter of the nut or distance across flats, d = thread pitch diameter.
l*(D-d) is the hoop stress area.
F*tan(thread angle/2) is the radial force at the pitch diameter.
Derived from the geometry of the thread to determine radial force component on the thread causing the nut to dilate.
Ted
RE: Calculating hoop stress in threaded fasteners
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Calculating hoop stress in threaded fasteners
Ted