carcentric
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| posted on 30/8/04 at 08:34 PM |
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Square tubing strength
Is square tubing more, less, or just the same resistant to flex across its diagonal (like this <> ) than in a "normal" orientation
(like this [] )?
Given the poorly worded question, here's another shot at it: If a 3' length of square tubing suspended at each end can hold X pounds at
the center when two sides are vertical and two are horizontal, would it hold X*k, X/k, or X pounds if rotated 45 degrees along its lengthwise center
axis?
[Edited on 30/8/04 by carcentric]
M D "Doc" Nugent
http://www.carcentric.com
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givemethebighammer
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| posted on 30/8/04 at 09:31 PM |
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something tells me that the tube should be stronger like this <> but not sure why
is any good :
http://mnhpva.org/tech/frame_tubes.html
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Tblue
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| posted on 30/8/04 at 09:39 PM |
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Less strength as the tube will deform flat easier. The loads should be placed square to the tube.
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Mix
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| posted on 31/8/04 at 08:56 AM |
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<> is much weaker than []
Mick
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leto
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| posted on 31/8/04 at 04:22 PM |
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A square tube is equal stiff in bending at any angel, at least in theory.
I 'm repeating my self ain't I? 
Cheers!
“I'm gonna ride around in style
I'm gonna drive everybody wild
'Cause I'll have the only one there is a round”. (J. Cash)
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JoelP
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| posted on 31/8/04 at 05:10 PM |
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yup, you are! and so will i! in my opinion, the <> is weaker cos it will collapse first. I think everyone will agree with this. [] there is no
obvious place for a fail to start, so it will last longer. with <> it will simply press flat and then go west.
Beware! Bourettes is binfectious.
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leto
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| posted on 31/8/04 at 08:05 PM |
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In which case it will collapse first is more a mater of how the load is applied and thats another story.
If the load is correctly applied the tub will be equally strong in all directions.
But true, it is a little easier to make the <>-case unstable but that is not a weakness in the tube but a weakness in the design where the tube
is used.
“I'm gonna ride around in style
I'm gonna drive everybody wild
'Cause I'll have the only one there is a round”. (J. Cash)
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carcentric
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| posted on 1/9/04 at 02:55 AM |
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This is the "anything else" forum, right?
I wasn't asking about tub construction - I have a length of square tubing that I want to use as a crossbeam from which I can hoist drivetrains
out of donor cars.
Sounds like it'll be safer to use the tubing in the [] orientation. Now to find some bedframe rails for the uprights! 
Thanks for the info.
M D "Doc" Nugent
http://www.carcentric.com
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Rorty
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| posted on 2/9/04 at 07:58 AM |
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Structural Sections Calculator.
Call me a spoilsport, but here's a page of useful free software including a structural sections calculator which will take a lot of the
guesswork and bull5hit out of comparing round to square tube.
Link.
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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