14-14. Consider the thin-walled tube of Fig 5-28. Use the formula for shear stress, tavg = T>2t Am, Eq 5-18, and the general equation of shear strain energy, Eq 14-11, to show that the twist of the tube is given by Eq 5-20. Hint: Equate the work done by the torque T to the strain energy in the tube, determined from integrating the strain energy for a differential element, Fig 14-4, over the volume of material. | |
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