Calculate axial load limit of a shrink fit?
Calculate axial load limit of a shrink fit?
(OP)
I'd really appreciate a little help here.
I plan to shrink fit a sleeve into a housing of same material using liquid nitrogen. The housing is stationary, so no torque transmitted, it just has to support the axial load.
I am looking for the formulae to calculate. I have found some online calculators, which tend to deal with force fits but not shrink fits. Although similar, there will be differences in surface finish values & deformation... Also, online calculators don't help me understand.
Any suggestions would be greatly appreciated. Would prefer metric, but can handle imperial units also.
Thank you
J
I plan to shrink fit a sleeve into a housing of same material using liquid nitrogen. The housing is stationary, so no torque transmitted, it just has to support the axial load.
I am looking for the formulae to calculate. I have found some online calculators, which tend to deal with force fits but not shrink fits. Although similar, there will be differences in surface finish values & deformation... Also, online calculators don't help me understand.
Any suggestions would be greatly appreciated. Would prefer metric, but can handle imperial units also.
Thank you
J





RE: Calculate axial load limit of a shrink fit?
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Calculate axial load limit of a shrink fit?
“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein
RE: Calculate axial load limit of a shrink fit?
Thanks Greg. That's pretty close to what I need.
J
RE: Calculate axial load limit of a shrink fit?
“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein
RE: Calculate axial load limit of a shrink fit?
Great work.
Thank you
J
RE: Calculate axial load limit of a shrink fit?
There seems to be a problem with the Pc formula. Uo is missing & it's missing a ] (closing square bracket)
J
RE: Calculate axial load limit of a shrink fit?
I took a look and can't see a problem , can you highlight it please
“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein
RE: Calculate axial load limit of a shrink fit?
Uo, poisson's ratio for the outer member, is listed but is not in the equation. Is that a typo or intentional?
Pc=x/[Dc*[((Dc^2+Di^2)/(Ei(Dc^2-Di^2))+((Do^2+Dc^2)/(Eo*(Do^2-Dc^2))-((Ui/Ei)+Ui/Eo))]
The second [ should be a (
Thanks
J
RE: Calculate axial load limit of a shrink fit?
I've verified this with the tribology calculator here.
http://www.tribology-abc.com/calculators/e3_8.htm
p =(1000*δ)/(d*(((d^2+di^2)/(Ei*(d^2-di^2))+((do^2+d^2)/(Eo*(do^2-d^2))-((vi/Ei)-(vo/Eo))))))
The 1000 is so you can use GPa instead of MPa.
Changes highlighted in red
This can be pasted into excel as is, just need to name the data cells appropriately.
It's been a good learning day today.
Thanks a lot for your help.
J
RE: Calculate axial load limit of a shrink fit?
I agree Ui should be Uo, yes there does appear to be a bracket missing also, thanks for that I'll see what I can do to get it corrected.
“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein