A 20-mm-diameter shaft with a 6-mm-diameter transverse hole is made of_cold- drawn steel having Su = 550 MPa and S, = 462 MPa. Surfaces in the vicinity of the hole have a machined finish. Estimate the safety factor with respect to infinite fatigue life for (a) torque fluctuations between 0 and 100 N•m, (b) a completely reversed torque of 50 N• m, and (c) a mean torque of 60 N • m plus a superimposed alternat- ing torque of 40 N•m. %3D
Design Against Fluctuating Loads
Machine elements are subjected to varieties of loads, some components are subjected to static loads, while some machine components are subjected to fluctuating loads, whose load magnitude tends to fluctuate. The components of a machine, when rotating at a high speed, are subjected to a high degree of load, which fluctuates from a high value to a low value. For the machine elements under the action of static loads, static failure theories are applied to know the safe and hazardous working conditions and regions. However, most of the machine elements are subjected to variable or fluctuating stresses, due to the nature of load that fluctuates from high magnitude to low magnitude. Also, the nature of the loads is repetitive. For instance, shafts, bearings, cams and followers, and so on.
Design Against Fluctuating Load
Stress is defined as force per unit area. When there is localization of huge stresses in mechanical components, due to irregularities present in components and sudden changes in cross-section is known as stress concentration. For example, groves, keyways, screw threads, oil holes, splines etc. are irregularities.
![A 20-mm-diameter shaft with a 6-mm-diameter transverse hole is made of_ cold-
drawn steel having Su
hole have a machined finish. Estimate the safety factor with respect to infinite fatigue
life for (a) torque fluctuations between 0 and 100 N•m, (b) a completely reversed
torque of 50 N •m, and (c) a mean torque of 60 N•m plus a superimposed alternat-
ing torque of 40 N •m.
8.37
= 550 MPa and S, = 462 MPa. Surfaces in the vicinity of the
[Ans.: 1.5, 1.9, 1.7]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F72e168db-dd32-4cd0-b85a-173ecfa9ca4f%2Faf9f1466-44ae-4593-b836-c80f93fa8782%2Fchg0w6e_processed.png&w=3840&q=75)
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