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    Largest Allowable Square Cross Section

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    Determine the largest allowable square cross section of a steel shaft of length 6 m if the maximum shearing stress is not to exceed 135 MPa when the shaft is twisted through one complete revolution. Use G = 77.2 GPa.

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    Problem 160671
    Consider the square shaft 6 metres long with each side being B cms.

    The formula or shear stress due to torsion is
    = T r / J (1)
    where is the shear stress
    T is the torque applied in Kg / cm2
    . r is distance of the extreme point on the square shaft from the center of the shaft
    J is the moment of inertia of the shaft
    As the shaft is square in cross section the moment of inertia is
    J = 1/12 ...

    Solution Summary

    Word doc attached gives calculations to find the largest allowable cross section of a described steel shaft in revolution.

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