) What is the relation between stress at the tension side and diameter of the fatigue test specimen? b) What is the unit of the endurance limit? c) How can the endurance limit for a fatigue analysis be calculated when real material properties are not available? d) Why some of the materials perform endurance limit, and some don’t? Give some examples from each group of material and discuss the reason
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) What is the relation between stress at the tension side and diameter of the fatigue test specimen?
b) What is the unit of the endurance limit?
c) How can the endurance limit for a fatigue analysis be calculated when real material properties are not available?
d) Why some of the materials perform endurance limit, and some don’t? Give some examples from each group of material and discuss the reason
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