Question

13.13 (B). A 250 mm diameter solid shaft drives a screw propeller with an output of 7 MW. When the forward speed of the vessel is 35 km/h the speed of revolution of the propeller is 240 rev/min. Find the maximum stress resulting from the torque and the axial compressive stress resulting from the thrust in the shaft; hence find for a point on the surface of the shaft (a) the principal stresses, and (b) the directions of the principal planes relative to the shaft axis. Make a diagram to show clearly the direction of the principal planes and stresses relative to the shaft axis. [U.L.] [90.8, 14.7, 98.4, ext{-}83.7 MN/m²; 47° and 137°.] 13.14 (B). A hollow shaft is 460 mm inside diameter and 25 mm thick. It is subjected to an internal pressure of 2 MN/m², a bending moment of 25 kN m and a torque of 40 kN m. Assuming the shaft may be treated as a thin cylinder, make a neat sketch of an element of the shaft, showing the stresses resulting from all three actions. Determine the values of the principal stresses and the maximum shear stress. [21.5, 11.8, 16.6 MN/m².]

          13.13 (B). A 250 mm diameter solid shaft drives a screw propeller with an output of 7 MW. When the forward
speed of the vessel is 35 km/h the speed of revolution of the propeller is 240 rev/min. Find the maximum stress
resulting from the torque and the axial compressive stress resulting from the thrust in the shaft; hence find for a point
on the surface of the shaft (a) the principal stresses, and (b) the directions of the principal planes relative to the shaft
axis. Make a diagram to show clearly the direction of the principal planes and stresses relative to the shaft axis.
[U.L.] [90.8, 14.7, 98.4, 	ext{-}83.7 MN/m²; 47° and 137°.]
13.14 (B). A hollow shaft is 460 mm inside diameter and 25 mm thick. It is subjected to an internal pressure of
2 MN/m², a bending moment of 25 kN m and a torque of 40 kN m. Assuming the shaft may be treated as a thin
cylinder, make a neat sketch of an element of the shaft, showing the stresses resulting from all three actions.
Determine the values of the principal stresses and the maximum shear stress.
[21.5, 11.8, 16.6 MN/m².]

13.13 (B). A 250 mm diameter solid shaft drives a screw propeller with an output of 7 MW. When the forward
speed of the vessel is 35 km/h the speed of revolution of the propeller is 240 rev/min. Find the maximum stress
resulting from the torque and the axial compressive stress resulting from the thrust in the shaft; hence find for a point
on the surface of the shaft (a) the principal stresses, and (b) the directions of the principal planes relative to the shaft
axis. Make a diagram to show clearly the direction of the principal planes and stresses relative to the shaft axis.
[U.L.] [90.8, 14.7, 98.4, ext-83.7 MN/m²; 47° and 137°.]
13.14 (B). A hollow shaft is 460 mm inside diameter and 25 mm thick. It is subjected to an internal pressure of
2 MN/m², a bending moment of 25 kN m and a torque of 40 kN m. Assuming the shaft may be treated as a thin
cylinder, make a neat sketch of an element of the shaft, showing the stresses resulting from all three actions.
Determine the values of the principal stresses and the maximum shear stress.
[21.5, 11.8, 16.6 MN/m².]

Added by Daniela O.

Question

Please give Ace some feedback