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Torsional shear stress for square bars

  1. Feb 3, 2012 #1
    Hi
    can any one help how to calculate torsional shear stress for square bars

    Regards,
    venkata prasad.G
     
  2. jcsd
  3. Feb 4, 2012 #2
  4. Feb 24, 2012 #3
    It depends on your ratio of height and width of the bar. The equation you would use to calculate the stress is as follows.

    σ=(Ta)/J

    a = shortest side

    The trick is figuring out what J is. There are a couple methods. The first method which isn't always accurate would be to use this equation.

    J=C(1/3)(b)(a^3)
    b= longer side

    C = .91 if , b<10a
    C= 1 of b>10a

    There are also tables out there that you can use to help you solve for the stress.

    For a quick reference you can also look at this webpage:
    http://www.sbainvent.com/strength_of_materials/noncircular-torsion.php
     
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