Shrink-Fitting
Shrink-Fitting
(OP)
I was wondering if I was given the small pipes ID, the large pipes OD and the stress wanted, could I find the thickness of the pipes needed to fit that citeria? Or what equations would i need to combined/use to get what I am being asked for?





RE: Shrink-Fitting
Huh?
RE: Shrink-Fitting
The change in circumference of the large pipe would be the circumference at elevated temperature - circumference at normal temperature which must finally be equal to the small pipe's circumference of its OD.
Stretch the larger pipe circumferentially by heating until ID = OD smaller pipe. The stress developed by the required stretching must be equal to the change in circumference between Large Pipes' ID and the Small Pipe's OD (when both are at normal temperature)
That change in circumference can be set equal to the change in length (in this case circumference) for a given stress of a material with some modulus of elasticity E (Young's modulus), therefore
Stress/Young's_Modulus * L1 = L2-L1
just substitute the circumferences for the lengths above.
now to get the change in temperature needed,
(S/E) / temperature expansion coefficient = dT
Please check the above for consistancy of units. I did it very quickly.
http://virtualpipeline.spaces.msn.com
RE: Shrink-Fitting
The small pipe was also assumed to be completely rigid.
http://virtualpipeline.spaces.msn.com