A solid steel shaft supporting an idler pulley ina V-belt drive is subject to a rotating reversingbending load of F=120 lbf due to the tensionin the belt (not shown). Since it is an idler,there is no torque in the shaft. Distancea=4.25 in, and the shaft diameter is d=3/4 in.Bearing spacing s=3.50 in. The shaft is cold-drawn steel with a hardness of 180 HBN. Itawill operate at room temperature, and needs areliability of 99%.a) Estimate the ultimate strength, fatiguestrength at 1000 cycles, and endurance limitof a rotating-beam fatigue test specimen ofthe shaft steel. Plot the results on the S-N curve below.Fb) Estimate the endurance limit of the actual shaft, and plot the results on the S-N curve below.Label all points.c) Estimate the safety factor against fatigue failure, i.e. S/oS-N Curve160140120100806040201.E+001.E+011.E+021.E+031.E+041.E+051.E+061.E+071.E+08Cycles to Failure NFatigue Strength S, (ksi)

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A solid steel shaft supporting an idler pulley in a V-belt drive is subject to a rotating reversing bending load of F=120 lbf due to the tension in the belt (not shown). Since it is an idler, there is no torque in the shaft. Distance a=4.25 in, and the shaft diameter is d=3/4 in. Bearing spacing s=3.50 in. The shaft is cold- drown oteel with a hordness of 190 HRN It

A solid steel shaft supporting an idler pulley in a V-belt drive is subject to a rotating reversing bending load of F=120 lbf due to the tension in the belt (not shown). Since it is an idler, there is no torque in the shaft. Distance a=4.25 in, and the shaft diameter is d=3/4 in. Bearing spacing s=3.50 in. The shaft is cold- drown oteel with a hordness of 190 HRN It

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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