Endurance strength from problem 4 is 30098 MPa The shaft sho

Endurance strength from problem 4 is 300.98 MPa

The shaft shown is part of a drive for an automated transfer system in a metal stamping plant. Gear A receives power from gear P. Gear C delivers the power to gear Q. The distance between the centers of each component is 300 mm. The torque on the shaft is 2425 N middot m. The forces on each gear are given in the table below. Using the endurance strength from problem 4, determine the shaft diameter. W_tA = 10,000 N downarrow W_rA = 4, 040 N rightarrow W_tC = 20,000 N downarrow W_rC = 8, 080 N leftarrow

Solution

The segment of shaft shown in Figure 1 is made of AISI 4130 annealed steel. The shaft is fine turned and cylindrically ground with a diameter of D=20 mm and with a transverse hole of d=2 mm diameter. The segment as shown is part of a drive shaft for a mixing machine. Under normal operating conditions the shaft segment rotates at 30 rpm and is subject to the following fluctuating loads: • A torque that varies from -120 Nm to +120 Nm once every ten seconds; • An axial tensile load that varies from 0 to 8 kN at the same rate as the torque variation; and A bending moment that varies between 10 Nm and 40 Nm once every second. Determine the expected life of this segment of shaft. (If you determine life in excess of the Endurance limit then determine the factor of safety).The segment of shaft shown in Figure 1 is made of AISI 4130 annealed steel. The shaft is fine turned and cylindrically ground with a diameter of D=20 mm and with a transverse hole of d=2 mm diameter. The segment as shown is part of a drive shaft for a mixing machine. Under normal operating conditions the shaft segment rotates at 30 rpm and is subject to the following fluctuating loads: • A torque that varies from -120 Nm to +120 Nm once every ten seconds; • An axial tensile load that varies from 0 to 8 kN at the same rate as the torque variation; and A bending moment that varies between 10 Nm and 40 Nm once every second. Determine the expected life of this segment of shaft. (If you determine life in excess of the Endurance limit then determine the factor of safety).