Thermal Expansion on the Inside
Thermal Expansion on the Inside
(OP)
Alright, I need a pointer to a resource to help explain something that I learned a while back.
If you look at a cross section of a pipe (or it could be a disc with a hole in the middle). Now, the metal heats up. Naturally, the OD gets bigger. But, so does the ID. The hole on the inside won't get smaller.
I learned this several years ago, but I don't remember the exact explanation. Do any of y'all have a reference that I can use to explain this phenomenon to someone else?
If you look at a cross section of a pipe (or it could be a disc with a hole in the middle). Now, the metal heats up. Naturally, the OD gets bigger. But, so does the ID. The hole on the inside won't get smaller.
I learned this several years ago, but I don't remember the exact explanation. Do any of y'all have a reference that I can use to explain this phenomenon to someone else?
Edward L. Klein
Pipe Stress Engineer
Houston, Texas
"All the world is a Spring"
All opinions expressed here are my own and not my company's.





RE: Thermal Expansion on the Inside
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Edward L. Klein
Pipe Stress Engineer
Houston, Texas
"All the world is a Spring"
All opinions expressed here are my own and not my company's.
RE: Thermal Expansion on the Inside
The simplest explanation I remember from highschool days was that thermal linear expansion obliges also the inner perimeter to elongate. This means the hole should get a larger diameter.
RE: Thermal Expansion on the Inside
If the coefficient of linear expansion is 10^-5, then for a 1 inch diameter tube with 0.1 inch thickness, a 100ยบ temperature change results in 0.0001 inch thickness change, but a 0.0016 inch change in circumference, resulting in a 0.0005 inch increase in diameter, trumping the thickness change.
TTFN
RE: Thermal Expansion on the Inside