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Round vs square tubing

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Round vs square tubing

Postby Farmwelding » Tue Mar 28, 2017 8:37 pm

Why do they use round tubing in auto sports and monster truck type stuff. Does it have more impact resistance than square tubing? Square is a hell of a lot easier to fab to me so round tubing must have a better quality to it. Maybe the way it interacts with the wheels and upper frame? I don't know.
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Re: Round vs square tubing

Postby Poland308 » Tue Mar 28, 2017 9:19 pm

The round shape distributes stress in a more even manner. Due to this fact they can often engineer extra strength with less weight. I.E. smaller diameter tube with thinner walls.
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Re: Round vs square tubing

Postby Coldman » Tue Mar 28, 2017 9:22 pm

Circles, cylinders and spheres are really interesting shapes and objects for many reasons.
Geometrically it can be shown they have the greatest surface areas and volumes per unit radius and surface area which means less material for same area or volume.
Engineering wise they have consistent distance from centrum to extremity (because its round) making load calculations easier from forces coming from any direction around the diameter compared to a square shape which has varying distance from centrum to extremity.

A tumbling roll cage can be impacted from any direction and multiple directions and each has to be allowed for in strength calculations, much easier to do with a round section. Also I suspect the round tube frame will be lighter than a square tube frame with the same strength.
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Re: Round vs square tubing

Postby edilberth225 » Tue Mar 28, 2017 10:07 pm

Coldman got it right
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Re: Round vs square tubing

Postby Erich » Thu Mar 30, 2017 12:51 am

And round looks a heckuva lot better in a roll cage than square or rectangle.
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Re: Round vs square tubing

Postby ex framie » Thu Mar 30, 2017 2:37 am

Also round tubing is stronger with less stress raisers due to no corners.
Its a better weight to strength ratio.
Can be a bugger to weld if you're not good at constant radius welding. Like me.

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Re: Round vs square tubing

Postby MinnesotaDave » Thu Mar 30, 2017 7:04 am

In addition to other comments, round tube can be bent any direction during the build process.
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Re: Round vs square tubing

Postby Oscar » Thu Mar 30, 2017 8:50 pm

What you talking about? Looks great!

Image

:)
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Re: Round vs square tubing

Postby MinnesotaDave » Thu Mar 30, 2017 9:08 pm

Oscar wrote:What you talking about? Looks great!

Image

:)


image.png
image.png (91.55 KiB) Viewed 482 times
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Re: Round vs square tubing

Postby Erich » Fri Mar 31, 2017 12:06 am

MinnesotaDave wrote:
Oscar wrote:What you talking about? Looks great!

Image

:)


image.png


Sorry square just does not cut it.
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