Answer:
[tex]\sigma = 44.286 N/mm2[/tex]
Explanation:
given data:
outside diameter = 68 mm
inside diameter = 49 mm
torque = 1996 Nm =1996000 Nmm
we know that torque for tubular section is given as
[tex]T = \frac{\pi}{16} \sigma \frac{D_0^4- D_i^4}{D_0}[/tex]
Plugging all value to get required value of maximum stress [tex]\sigma[/tex]
[tex]1996000 = \frac{\pi}{16} \sigma \frac{68^4 - 49^4}{68}[/tex]
[tex]\sigma = 44.286 N/mm2[/tex]