As figure show are depicts the cross-section of a closed-end cylinder with an internal diameter of 0.2 m and an exterior diameter of 0.4 m with a thick-walled pressure vessel (closed-end cylinder) with an internal diameter of 0.2 m and an external diameter of 0.4 m. Both internal and external pressures, Pi and P, are applied to the pressure vessel. Find the following given P. = 10 MPa: a). The internal pressure Pi, which will result in a 150 MPa tensile hoop stress at point B, which
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.
As figure show are depicts the cross-section of a closed-end cylinder with an internal diameter of 0.2 m and an exterior diameter of 0.4 m with a thick-walled pressure vessel (closed-end cylinder) with an internal diameter of 0.2 m and an external diameter of 0.4 m. Both internal and external pressures, Pi and P, are applied to the pressure vessel. Find the following given P. = 10 MPa:
a). The internal pressure Pi, which will result in a 150 MPa tensile hoop stress at point B, which is in the middle of the cylinder wall.
b). Draw all of the stress distributions over the wall thickness and their stress values on the cylinder's inner and outer surfaces.
c). The longitudinal tension that the cylinder is subjected to.
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