What do you mean by fatigue failure of machine parts? Explain briefly. Give an example of a thing or part that failed by the repeated compressive load in daily life use. And Sketch stress-strain curves of ductile and brittle materials. Show all the relevant points and strength. Also, discuss the differences of behaviour between ductile and brittle material with respect to stress-strain curves.
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.
What do you mean by fatigue failure of machine parts? Explain briefly. Give an example of
a thing or part that failed by the repeated compressive load in daily life use. And Sketch stress-strain curves of ductile and brittle materials. Show all the relevant points and
strength. Also, discuss the differences of behaviour between ductile and brittle material with
respect to stress-strain curves.
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