The vacuum was simply to illustrate "no outside forces" such as environmental.
I know I'm asking something odd. And to the second point, I know it won't in any of our time.
But when Jesus shows back up, is He going to have to bring a torque wrench? (please don't get into a religion...
So after the first 20, was there ANY relaxation? If you can measure to the 4th decimal, I'd assume you can be confident that it didn't compress the next 75 years.
Also, thank you to everyone! This has been very interesting!
While that is true, there are many factors aside from the material in question. Environmental factors which would assist in the reduction of clamping force. Corrosion for one big one.
That is very interesting....
"The results of the successive loading dead-weight creep tests showed that creep...
Ok Thank you.
My thinking was the 2nd one, that it would never reach zero. That the joint would indeed reach an equilibrium and retain a clamping force, forever.
And thank you for the link.
No, we didn't consider drift. That's a good point and we could easily check that.
However the initial relaxing of the bolt is expected, which prompted the question posed in the opening.
That article looks promising. Thank you for the link. However, I can't say for sure if it's worth 40$ for...
Not sure how I quote you..... but good question!
Lets say, held at constant temp. Torqued in a vacuum, left in said vacuum.
Just looking for straight material science.
Coworker and I were discussing this yesterday.
We needed to do a quick 24 study on the clamp force, or rather the holding ability (not sure what term to use, sorry) of a bolt/nut.
We torqued the nut on a pancake load cell and recorded the results over a 24hr period.
The torque applied was 90Nm...
