Torsional shear stress and deformation 5. Compute the torque T and Tc due to tensile forces in the belts at point B and C, respectively. 6. Draw the torque diagram to show the level of torque in all segments of the shaft. 7. Compute the nominal torsional stress TEAM and T on the outer surface of the shaft for cross sections passing through points B and C due to the torque T and Tc 8. What is the value of the shear stress at the center of the cross section passing through point B and that passing through point C? 9. Assuming that the shaft is made of steel, compute the angle of twist of the cross section passing through B with respect to that passing through point C. 10. Determine the stress concentration factor K,, in torsion, for a sled-runner keyseat 11. Using the stress concentration factor K.just determined, calculate the shear stresses T and to on the outer surface of the shaft for cross sections passing through points B and C, respectively. Key Design 12. Determine the force F that the shaft exerts on the key. 13. Suggest the dimensions (length, width, and height) of the key if it was made of steel. (there are many possible solutions). P = 6.2 kN Bearing 200 mm 200 mm 200 mm 110 N 120 mm-dia. pulley B 28 mm-dia. 400 N 610 N 1400 N 240 mm-dia. pulley NOTE: Pulleys are keyed to the shaft with sled-runner keyseats D P=6.2 KN Thrust Bearing