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moment of inertia
Last Post 25 Aug 2012 03:35 PM by Nathaniel. 1 Replies.
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rule857
New Member
New Member
Posts:2

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23 Aug 2012 07:03 AM
    How do I calculate the moment of inertia of a hollow hexagon. The hexagon is 0.87" flat to flat. The wall thickness is 0.200" thick.

    I am trying to see if the hollow hex will be better then a solid hex in a beam calculation.

    Material is 6063 T5 alluminum
    Nathaniel
    Basic Member
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    Posts:193

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    25 Aug 2012 03:35 PM
    Rule:

    The moment of inertia (MI) for a hexagon is given on the website -

    http://en.wikipedia.org/wiki/List_o...of_inertia

    For a hollow hexagonal beam you need to subtract the hollow space from the outer shape.

    Since you have a lower MI the hollow will not be as stiff as the solid beam, but if you use stiffness or strength to weight ratio the hollow will have a higher value.

    Niel Leon
    Engineering.com
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