LoCorun
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| posted on 20/12/05 at 06:48 PM |
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I'd say A. The Tao is in the Symmetry.
Considering I'm doing Further Mathematics A-Level you woulda thought I'd give a more logical answer, eh?
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clbarclay
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| posted on 21/12/05 at 05:53 PM |
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quote:
Originally posted by MikeRJ
For the case where the round tubes diameter = distance accross flats of the square section, the latter will be the heaviest and strongest.
If you read my origional post carfully you will see i am talking about the 'second moment of area'. This is influenced by the diameter,
but don't mistake the two for being the same.
second moment of area for a square section
=
bredth*depth*depth*depth
divided by
12
second moment of area for a round section
=
Pi*diameter*diameter*diameter*diameter
divided by
64
As gazza285 points out the squares is not as strong at 45 degrees, the round being the same strength at any angle. Assuming the load (side impact in a
crash) is stright from the side, then the square section should be stronger.
If anyone cares to dispute/correct me on this then do show some sort of proof (mathematical etc).
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