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    Toric Posts: 1, Reputation: 1
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    #1

    Feb 26, 2009, 06:20 AM
    How do I calculate the torsional elasicity of a rubber rod
    How can I calculate the elasicity in a rubber rod.
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Feb 26, 2009, 10:31 AM

    See:

    http://en.wikipedia.org/wiki/Torsion_(mechanics)

    You can determine the material's shear modulus by clamping one end and applying a torque at the other, and seeing how miuch the rod twists. The basic equation is:



    where:
    = Shear modulus, which is basically the torsional modulus you are looking for,
    = torque applied at one end of the rod,
    = length of the rod,
    = the torsion constant for the rod - for a round or tubular rod this is the same as its polar moment of inertia, and
    = angle of deflection, in radians.
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