With respect to the S-N diagram shown below, answer the following questions: (a) for Gray cast iron, what is the projected number of cycles to failure for an induced stress of 20,000 psi? (b) What is the endurance limit and associated stress for a 0.47% heat treated carbon steel? (c) What is the endurance limit for the Aluminum-copper alloy? (d) What is the endurance strength for heat treated Alloy Steel at 400,000 cycles?
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.
With respect to the S-N diagram shown below, answer the following questions:
(a) for Gray cast iron, what is the projected number of cycles to failure for an induced stress of 20,000 psi?
(b) What is the endurance limit and associated stress for a 0.47% heat treated carbon steel? (c) What is the endurance limit for the Aluminum-copper alloy?
(d) What is the endurance strength for heat treated Alloy Steel at 400,000 cycles?
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
