1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Moment of inertia of T shape

  1. Dec 26, 2009 #1
    h have a T shaped object (2-d) for which i need to find the moment of enertia,
    i used a parallel axis theorem, then to check myself i found i site which had a direct equation for it
    http://www.efunda.com/designstandards/beams/SquareTbeam.cfm

    what i did

    b1=100mm
    h1=12mm
    b2=12mm
    h2=75mm
    q=12.643mm(the distance from the joint of the 2 shapes to the centroid of the T)

    >> ((b1*h1^3)/12)+((b1*h1)*(q+h1/2)^2)+((b2*h2^3)/12)+((b2*h2)*(h2/2-q)^2)

    1.4094e-006 m4

    using their equation

    t=12mm
    y=75-12.643=62.357mm
    b=100mm
    s=12mm
    d=87mm

    >> (t*y^3+b*(d-y)^3-(b-t)*(d-y-s)^3)/3

    7.6247e-006m4


    where have i gone wrong here?
     
  2. jcsd
  3. Dec 26, 2009 #2
    sorry posted this in the wrong category
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Moment of inertia of T shape
  1. Moment of inertia (Replies: 2)

  2. Moment of inertia (Replies: 4)

  3. Moment of inertia (Replies: 1)

Loading...