Thread strength calculation
Thread strength calculation
(OP)
Hey, I'm trying to find out if I have enough threads to withstand a force caused by pressure.
The hub is made of duplex steel and the threaded cylinder is of Titanium Grade 2.
The threads are 1/2'' BSP Pipe threads.
Just a quick sketch:

Is it enough to calculate the shear stress :
tau = F/pi*di*L and just compare it to the shear strength of Ti
Or do I have to take in account the amount of stress every thread takes?
All comments are appreciated, thanks.
The hub is made of duplex steel and the threaded cylinder is of Titanium Grade 2.
The threads are 1/2'' BSP Pipe threads.
Just a quick sketch:

Is it enough to calculate the shear stress :
tau = F/pi*di*L and just compare it to the shear strength of Ti
Or do I have to take in account the amount of stress every thread takes?
All comments are appreciated, thanks.





RE: Thread strength calculation
I should be able to make use of that I think.
It's located here :
http://ww
RE: Thread strength calculation
In short, shear stress on the threads depends on which material is stronger, the bolt or nut. Equations are given for each case. Suggestion: make a spreadsheet or use your fav. math software program.
RE: Thread strength calculation
Let's say I calculate the cross-sectional trough which the shear occurs, and I use an engagement length equal the bolt diameter.
Can I divide the force F, applied to the bolt with this calculated area and compare the result with the bolt material?
It's funny how one can calculate engagement without concidering forces acting on the fasteners..
Thanks again
RE: Thread strength calculation
Safety factor for bolting is typically 3 to 4. Note that by torquing a bolt, the shear stress created simply by torquing the nut/bolt may be SIGNIFICANTLY higher than the shear stress calculated by taking the force being resisted and dividing by area since the force created by torquing a fastener is generally higher than the force needing to be resisted - and that's ok and is in fact, preferable.
RE: Thread strength calculation
In my case there is little tourquing, the cylinder with the threads will just be aligned with a plane and only has to withstand pressure.
If I use the following equation for tensile stress area ;
A(sub t) = pi/4*[d-(0.9743/n)]^2
could I divide the force by this and then compare directly with the tensile strength?
Thank you
RE: Thread strength calculation
RE: Thread strength calculation
RE: Thread strength calculation
Happy hunting. ;)
RE: Thread strength calculation