Figure Q3 shows (1) an straight shaft and (2) a stepped shaft
Figure Q3 shows (1) an straight shaft and (2) a stepped shaft. Both are made of steel having Su = 150 ksi and Sy = 90 ksi. Surfaces of the shafts are fine-ground. Varied torque T of 0 to 20x103(Ibxin) is applied.
a) Estimate the S-N curve with 95% reliability under torsion loading.
b) For the straight shaft, calculate the safety factor against infinite fatigue life with 95% reliability.
c). For the stepped shaft, calculate the safety factor against infinite fatigue life with 95% reliability. (Use extrapolation of Figure 8.24 to get q if necessary)
Homework Answers
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The shaft shown in figure is subjected to a reversed bending torque .The moment is distributed along the shaft as if...
The shaft shown in figure is subjected to a reversed bending torque .The moment is distributed along the shaft as iflustra values 2000N.m and 3000 transmitted torque T-4000 N.m .The shaft is made of hardened steel having (Sy-900 MP, Su-1200 MP. ),and all important surfaces are finished by grinding For reliability of 99% and a safety factor of 2.5. (a) Determine the diameter d against static failure (b) Determine the diameter d against fatigue failure using Goodman approach if D-1.1d...
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mounted on a simply
supported shaft. Bearing B takes thrust. A flexible coupling for
transmitting
torque attaches to the right end of the shaft. The left end is
free.
1-Draw load, shear force, and bending moment diagrams for the
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for this location determine the diameter theoretically required for
infinite life. Assume...
The shaft shown in figure is subjected to a reversed bending torque .The moment is distributed along the shaft as iflustra values 2000N.m and 3000 transmitted torque T-4000 N.m .The shaft is made of hardened steel having (Sy-900 MP, Su-1200 MP. ),and all important surfaces are finished by grinding For reliability of 99% and a safety factor of 2.5. (a) Determine the diameter d against static failure (b) Determine the diameter d against fatigue failure using Goodman approach if D-1.1d...
6. For the bearing with the largest radial load and without
knowing the shaft diameter, what would be the catalog rating for a
radially loaded ball bearing to withstand 1000 x 10e6 cycles with
90% reliability. The bearing manufacturer rates its bearing for a
million cycles.
7. A 10 mm diameter steel shaft is subject to bending stresses
only. The material has Sut = 1100 MPa and Sy = 950 MPa and a
fine-ground surface finish.
1. Determine the factor...
A stepped shaft with a ground finish is made of steel with an ultimate tensile strength of 1200 MPa. The shaft is loaded with a fully reversed torque of 20 Nm. Dimensions of the shaft are given below. (5) a) Given the stress concentration for fatigue loading, Kfs 1.3, find the location and magnitude of the maximum stress in the shaft. (14) b) Find the endurance limit, assuming room temperature and a reliability of 99%. (1) c)Will the part have...
A rotating shaft is made of 42 mm by 4 mm thick cold-drawn round steel tubing and has a 6 mm diameter hole drilled transversely through it. The shaft is subjected to a pulsating torque fluc- tuating from 20 to 160 Nm and a completely reversed bending moment of 200 Nm. The steel tubing has a minimum strength of Sut 410 MPa (60 ksi). The static stress-concentration factor for the hole is 2.4 for bending and 1.9 for torsion. The...
Figure below shows the load components acting on a helical gear
mounted on a simply
supported shaft. Bearing B takes thrust. A flexible coupling for
transmitting
torque attaches to the right end of the shaft. The left end is
free.
1-Draw load, shear force, and bending moment diagrams for the
shaft, in both the horizontal and vertical planes.
2- Identify the most critically loaded shaft cross section, and
for this location determine the diameter theoretically required for
infinite life. Assume...
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