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Moment of inertia formula

  • Thread starter Sud89
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  • #1
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Homework Statement


To calculate the moment of inertia of a cantilevered tapered tube with mid-thickness large radius RL and mid-thickness small radius RS

Homework Equations


upload_2015-11-9_19-52-48.png


The Attempt at a Solution


Area of the larger end of the tube
AL=2*pi*RL*t
Area of the smaller end of the tube
AS=2*pi*RS*t
Area of the tube at a distance x is
AX=2*pi*RX*t
RX=RL - x*tanalpha
tanalpha=deltaR/L
deltaR = RL-RS[/B]
 

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Answers and Replies

  • #2
SteamKing
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When you say 'calculate the moment of inertia', do you mean calculate the 'second moment of area' of the cross section of the tube (units of L4 ) or do you mean calculate the 'mass moment of inertia' of this piece (units of ML2 )? It makes a difference ...
 
  • #3
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When you say 'calculate the moment of inertia', do you mean calculate the 'second moment of area' of the cross section of the tube (units of L4 ) or do you mean calculate the 'mass moment of inertia' of this piece (units of ML2 )? It makes a difference ...
Second moment of area
 
  • #4
SteamKing
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Second moment of area
How would you calculate the second moment of area for a circle?
 

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