Direct Compression stress and deformation 1. Compute the nominal direct normal stress due to the compressive load P= 6.2 kN. 2. Assuming that the shaft is made of steel, compute the deformation due to force P. 3. Determine the stress concentration factor K, for a sled-runner keyseat (same as in bending). 4. Using the stress concentration factor K, just determined, calculate the direct normal stress 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 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 TC 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). 200 mm 200 mm 200 mm 110 N 120 mm-dia. pulley 610 N A B P = 6.2 KN Bearing C D P = 6.2 kN Thrust Bearing 28 mm-dia. 400 N 1400 N 240 mm-dia. pulley NOTE: Pulleys are keyed to the shaft with sled-runner keyseats