Silly simple question

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Caito
13
Joined: 16 Jun 2009, 05:30
Location: Switzerland

Silly simple question

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Hi guys!

First of all, merry christmas :D

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.
Come back 747, we miss you!!

biker_ev
0
Joined: 11 Dec 2016, 04:04

Re: Silly simple question

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

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void
4
Joined: 03 Apr 2009, 15:27

Re: Silly simple question

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The hole gets bigger.

Greg Locock
233
Joined: 30 Jun 2012, 00:48

Re: Silly simple question

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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.

noname
10
Joined: 13 Feb 2009, 11:55
Location: EU

Re: Silly simple question

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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.

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hollus
Moderator
Joined: 29 Mar 2009, 01:21
Location: Copenhagen, Denmark

Re: Silly simple question

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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
Rivals, not enemies.

Brian Coat
99
Joined: 16 Jun 2012, 18:42

Re: Silly simple question

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Yes

Fe_3 Pt

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SteveRacer
2
Joined: 20 Mar 2014, 01:13

Re: Silly simple question

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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.

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