# EDPT501-assignment #2.pdf - EDPT 501 Engineering Design I...

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EDPT 501 Engineering Design I Winter 2013/2014 Assignment # 2 Problem 1 A rotating shaft is loaded as shown in the figure below (the forces are stationary and the torques are steady). The bending moment diagrams (in two perpendicular planes) as well as the torque diagram are also shown. The shaft is machined from medium carbon steel bar with ultimate tensile strength of 620 MPa and tensile yield strength of 450 MPa. For infinite life, a reliability of 90% and using the ASME elliptic line method determine the shaft diameter at sections C and D if the stress concentration factors at each section are estimated to be (in all iterations) as shown in the following table. Note: Use only two iterations after the first estimation of the shaft diameter. Section K f K fs C 1.42 1.35 D 1.54 1.4

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Problem 2 Find the power required to drive a 40-mm (outer diameter) power screw having double square threads with a pitch of 5 mm. The power screw is used to raise a load of 15 kN at a velocity of 60
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