How to Calculate Pressure/Gap in Heated Fastened Materials?

AI Thread Summary
To calculate the pressure or gap between a heated fastener and a pipe made of different materials, start by assuming smooth cylindrical surfaces that expand radially without longitudinal expansion. Utilize the coefficient of thermal expansion for the materials involved, which can be found on Wikipedia. The "expanding ring" problem is a relevant concept that is well-documented in structural mechanics engineering textbooks. These resources will provide the necessary equations and data to guide calculations. Understanding these principles will help in determining the pressure or gap effectively.
Dafe
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Hey,
let's say I have a pipe with a fastener screwed into it.
If they are of different materials, how can I find out the pressure/gap between the bolt and nut if they are heated?
I don't expect a complete solution of course, just a couple of hints to get me going :)

Thanks!
 
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I would first make the assumption they the two pieces are not thread and have simple smooth cylindrical surfaces and are cylindrical in shape. I would also make the assumption they the don't expand longitudinally but just radially.

Wikipedia has all the equations you need and data for popular materials. http://en.wikipedia.org/wiki/Coefficient_of_thermal_expansion

The "expanding ring" problem in which you essentially now have is well covered in most structural mechanics engineering textbooks. If the wikipedia site doesn't give you enough info, a descent text will.
 

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