Preloaded bolt 10

[NedGan76]

Howdy!

This is another tricky problem to check your knowledge and common engineering sense

Given a steel bolt in an infinitely stiff package. First, we tighten the nut until we prestress the bolt with a force P. Then, we pull the bolt with a force F. What is the final axial force inside the bolt (between the head and the nut):
A) P + F
B) F
C) P
D) other (please explain)

Cheers!
Ned Ganchovski

A better software for your calculation notes, free and open source:

GitHub - Proektsoftbg/Calcpad: Free and open source software for mathematical and engineering calculations.

Free and open source software for mathematical and engineering calculations. - Proektsoftbg/Calcpad

github.com

 

[ALK2415]

@ HTURKAK
You are quite resourceful!
could you recommend some German (Translated) structural textbooks?
Your people have entirely different and beautiful mindsets than others !
Anything for handbook in structural analysis (like portal-frames .. etc )
will be much appreciated
and thanks in advance...

 

[271828]

Sometimes it is necessary to look reference books. The following figure is useful to remind the prestressing concept..
Copy and paste from Advanced Stress and Stability Analysis ( V. I. Feodosiev )

I'd love to find a video showing the spring scale experiment. I've looked for 20 minutes and haven't found one. Any chance you have one?

 

[CarlB]

This video shows an animation, though not an actual experiment..

https://www.facebook.com/nordlockgroup/videos/536169386776666/

 

[Tomfh]

P until F exceeds P, then F

 

[HTURKAK]

I also looked but could not see a video of an experiment. This could be tested if you have spring balance. The following excerpt from NORTON 4th edition shows the concept of preloading .

Use it up, wear it out;
Make it do, or do without.

NEW ENGLAND MAXIM