Force exerted onto the pipe by a shrunk fit ring

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Discussion Overview

The discussion revolves around calculating the force exerted onto a pipe by a stainless steel ring when the ring is shrunk fit onto the pipe through heating. The scope includes theoretical considerations related to thermal expansion and material properties.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant requests specific dimensions of the pipe and ring to proceed with the calculation.
  • Another participant explains that as the steel ring cools, it will be in tension while the pipe will be in compression, highlighting the role of thermal strain.
  • It is noted that the problem can be simplified by assuming the pipe does not change temperature during the process.
  • Concerns are raised about differential thermal expansion when two dissimilar metals are involved, which may affect the calculations.
  • A participant provides the outer and inner diameters of both the pipe and the ring, along with the width of the ring, seeking further assistance on the force calculation.
  • One participant questions whether the inquiry is related to homework.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the calculation method or the specific force value, and multiple viewpoints regarding the assumptions and parameters involved remain present.

Contextual Notes

Limitations include the need for specific temperature values and the assumption that the pipe does not change temperature, which may not reflect real-world conditions.

Who May Find This Useful

Individuals interested in thermal expansion, material science, and engineering applications involving shrink fitting may find this discussion relevant.

sunshine76
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hi, this is my first post here in this forum. i would like somebody here to help me in calculating the force exerted onto the pipe by a stainless steel ring of 10mm thickness, when it is shrunk fit on to the pipe by heating.

thanks in advance
 
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What are the inner and outer diameters. Theoretically, it depends on whether thay are considered thick walled cylinders, i.e. ID/t<10.
 
As the steel ring cools, it thermally contracts. The steel ring will be in tension and the pipe on to which it shrinks will be in compression.

The key about thermal strain is that it does produces displacement without stress.

One needs the IDs/ODs of the pipe and steel ring, and the starting and final temperatures of the steel ring. One can simply the problem by assuming the pipe does not change temperature from its initial temperature (e.g. room temp) and this is the final temperature of the steel ring.

When two dissimilar metals are mated, one must be concerned with differential thermal expansion - a consequence of different thermal expansion coefficients and/or thermal gradients.
 
Pipe OD: 127mm
Pipe ID: 115mm

Ring OD:133mm
Ring ID: 126.5mm
Ring width:20mm

Please anyone tell me when the ring is heated and fitted onto the pipe, what will be the force exerted on the pipe?
 
Is this homework?
 

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