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 moment of inertia Last Post 25 Aug 2012 03:35 PM by Niel. 1 Replies. Sort: Oldest First Most Recent First
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rule857

New Member
Posts:2

 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
Niel

Basic Member
Posts:193

 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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