Which of the followings is NOT correct: Question 4 options: 1.The constants C2 and C3, which appear in the differential equation associated with the deformation of a plate, are zero for both fixed and simply supported circular plates. 2.For a fixed plate under uniform pressure, the absolute value of the maximum radial stress is always higher than the circumferential stress at the plate edge. 3.For a simply supported plate under concentrated force at centre, the radial stress at the centre is discontinuous. 4.For a fixed plate under uniform pressure, the plate radial stress is always compressive.
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.
Which of the followings is NOT correct: Question 4 options:
1.The constants C2 and C3, which appear in the differential equation associated with the deformation of a plate, are zero for both fixed and simply supported circular plates.
2.For a fixed plate under uniform pressure, the absolute value of the maximum radial stress is always higher than the circumferential stress at the plate edge.
3.For a simply supported plate under concentrated force at centre, the radial stress at the centre is discontinuous.
4.For a fixed plate under uniform pressure, the plate radial stress is always compressive.
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