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<blockquote data-quote="Welderd" data-source="post: 103835" data-attributes="member: 144"><p>yup the round would win then</p><p></p><p>it's all about the amount of material at the extreme fiber (material at top and bottom).</p><p>As far as different shapes goes it's all about the moment of inertia</p><p> to make your brain hurt - <a href="http://en.wikipedia.org/wiki/Moment_of_inertia" target="_blank">http://en.wikipedia.org/wiki/Moment_of_inertia</a></p><p></p><p>simplify all that into:</p><p> square I = (b x h^3) / 12 - <a href="http://www.engineersedge.com/calculators/section_square_case_6.htm" target="_blank">http://www.engineersedge.com/calculators/section_square_case_6.htm</a></p><p> round I = (pi x d^4 ) / 64 - <a href="http://www.engineersedge.com/calculators/section_square_case_11.htm" target="_blank">http://www.engineersedge.com/calculators/section_square_case_11.htm</a></p><p></p><p></p><p></p><p>Now as far as 7000 AL </p><p> The first number is the series or family that the aluminum is in. 7 thousand series are all in the same "family" and will have similar material traits. I haven't looked up what 7000 is so I don't know for sure but if your tensile strength numbers are correct then it would be stronger but there would be other things to check for to see how they compare to 7075.</p><p>cost, hardness, fracture toughness and some others. 7075 is proven in our applications so just use that as a baseline.</p></blockquote><p></p>
[QUOTE="Welderd, post: 103835, member: 144"] yup the round would win then it's all about the amount of material at the extreme fiber (material at top and bottom). As far as different shapes goes it's all about the moment of inertia to make your brain hurt - [url=http://en.wikipedia.org/wiki/Moment_of_inertia]http://en.wikipedia.org/wiki/Moment_of_inertia[/url] simplify all that into: square I = (b x h^3) / 12 - [url=http://www.engineersedge.com/calculators/section_square_case_6.htm]http://www.engineersedge.com/calculators/section_square_case_6.htm[/url] round I = (pi x d^4 ) / 64 - [url=http://www.engineersedge.com/calculators/section_square_case_11.htm]http://www.engineersedge.com/calculators/section_square_case_11.htm[/url] Now as far as 7000 AL The first number is the series or family that the aluminum is in. 7 thousand series are all in the same "family" and will have similar material traits. I haven't looked up what 7000 is so I don't know for sure but if your tensile strength numbers are correct then it would be stronger but there would be other things to check for to see how they compare to 7075. cost, hardness, fracture toughness and some others. 7075 is proven in our applications so just use that as a baseline. [/QUOTE]
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