A plate made is made up of 40 C8 (OU= 630 N/mm²), is hot rolled and normalized. It is subjected to completely reversed axial load of 50 KN. The notch sensitivity factor can be taken as 0.85 and the expected reliability is 90%. The factor of safety is 2. Determine the plate thickness for infinity life. 50 KN 50 15 50 KN
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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Introduction
These abrupt changes in shape under load circumstances frequently result in localized stress fields where the part generally fails. This type of localized stress is known as stress concentration, and the qualities that cause it are known as stress concentrators or stress raisers.
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