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Hi guys!

First of all, merry christmas

Yesterday I had this simple thought, but since I'm not a mechanical engineer I wasn't sure of the solution.

If you have a piece of sheet metal with a hole in it and you heat it up, is there any way that the hole becomes smaller? Imagine if the sides are constrained and the thermal expansion uses the hole space, or something like that.

Normally to put a bearing you heat the case, so the direct answer is no, but could it?



Cheers, and thanks for your input!

PS Sorry if this is not the correct place for this question, wasn't sure where to put it.

I don't think so, unless you heat it up a LOT and add some material like bronze...(brazing).

The hole gets bigger.

I think that if you had a rigid frame , with cooling and then welded your sheet of metal inside , maybe. Or ignore the sheet metal , make the sheet of kevlar.

If the plate will be restrained on the outer edges it can/will deform out of plane. Hole may get deformed, but it will not get smaller.

Never say never. The list is relatively small and seems to exclude simple metals. It does though, include graphene. Active aero anyone?
https://en.m.wikipedia.org/wiki/Negativ ... _expansion
And even some metals here:
http://iopscience.iop.org/article/10.10 ... 3/1/013001

Yes

Fe_3 Pt

When you put cylinder sleeves in a block, you put the block in the oven and cool the sleeves. They slide right in, when everything hits room temp they aren't coming out.