= 69.0 psi. In a test on an aerosol can it was loaded to a gage pressure p While pressurized, the can is also subjected to a tensile axial load N = 400 lb and a torque T= 250 in - Ib. The can has 3.0 in diameter and wall thickness t = 0.006 in. The cross-sectional area of the wall (thin ring) is A = 2rrt and the polar moment of inertia of the wall (thin ring) with respect to the centroid is J= 2r°t. The maximum shear stress Tr on the surface is t= J The blue point on the surface of the aerosol can has its sides parallel and perpendicular to the can's longitudinal axis (x). Determine magnitudes of normal and shear stresses acting on the blue point. Ox = O : Oy = OH =, Sketch the stresses with their correct senses on the enlarged view of the blue point below.
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.
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