A composite bar is made up by connecting a steel member and a copper member rigidly fixed at their ends. The cross-sectional area of steel member is A cm^2 while that of the copper member is 2A cm^2 for half the length and A cm^2 for the other half of the length. the coefficient of expansion of steel and copper are α and1.25α respectively while the elastic moduli are e and 0.5E respectively. Estimate the stress induced inmembers due to temperature rise of T degrees.
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 composite bar is made up by connecting a steel member and a copper member rigidly fixed at their ends.
The cross-sectional area of steel member is A cm^2 while that of the copper member is 2A cm^2 for half the length and A cm^2 for the other half of the length. the coefficient of expansion of steel and copper are α and1.25α respectively while the elastic moduli are e and 0.5E respectively. Estimate the stress induced inmembers due to temperature rise of T degrees.
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