Interference fit between a bin and a cylinder

[franc11]

Hi all, I have here a little problem.

Is there any way to calculate the equivalent pressure on a pin caused by an interference fit with a cylinder?

Thanks.

 

[electricpete]

My terminolgoy for you pin inside cylinder would be shaft inside hub. From Fielding's Handheld Caculator Programs for Rotating Equipment:

P = [<(delta*E )/ (2*rb*rc^2)> - <(3+nu)*w^2*rho/(8*g)>] * [rc^2-rb^2]

Symbols:
(1) ra = shaft id (often 0
(2) rb = shaft od and hub id (approx)
(3) rc = hub od
(4) delta = static interference
(5) E,nu - material properties
(6) w = angular speed.
(7) g = gravitation conversion

If w=0 (stationary), then this reduces to
P = [(delta*E )/ (2*rb*rc^2)] * [rc^2-rb^2]


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[franc11]

Should have state something at the start. The pin and and cylinder are made with different materials.

 

[electricpete]

See this excerpt from Shigley's Standard Handbook of Machine Design:

http://home.houston.rr.com/electricpete/Interference.ppt

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[electricpete]

I forgot to say that a, b, c are similar to ra, rb, rc above.

a = radius of inside of inner cylinder
b = raidus of outside of inner cylinder (same as inside of outer cylinder)
c = radius of outside of outer cyliner

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[franc11]

Thanks, this will really help!

 

[GregLocock]

A question, asked frequently.

Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[Cockroach]

Check out the forum at University of Tennessee, Martin. There is a website for Mechanical Engineering, the professor posted his notes on interference fits using Thick Wall Pressure Vessel Theory. Appended to the notes is a physical example of the application.

There have been past threads on this subject,as GregLocock correctly pointed out.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada