Material Sy Sut E AISI 4130 100 ksi 125 ksi 29 x 10^3 ksi AISI 1025 36 ksi 55 ksi 29 x 10^3 ksi Aluminum 2014 T6 53 ksi 60 ksi 10.8 x 10^3 ksi Aluminum 6061 T4 16 ksi 30 ksi 9.9 x 10^3 ksi Ti-6AL-4V 126 ksi 134 ksi 16 x 10^3 ksi You have a bar of AISI 4130 steel, a bar of Aluminum 6061 T4, and a bar of Ti-6AL-4V. All of the bars have identical cross section areas of 1 in^2. An axial stress of 20 ksi is placed on each of the bars. Which bar will yield? AISI 4130 Steel Aluminum 6061 T4 Ti-6AL-4V All of the bars will yield
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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