A stepped diameter shaft is supported by ball bearings as shown in the figure below The bearing has a slight eccentricity that induces a bending moment in the shaft as it rotates Measurements indicate that the resulting alternating stress due to bending is a 83ksi The torque on the shaft fluctuates from 800 inlbs to a low of 100 inlbs and is in phase with the bending stress The shaft is ground and its dimensions are D 0900in d 0750in and r 0062 in the shaft material is SAE1040 coldrolled ste

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