A hollow shaft made from AISI 4340 steel has an outer diameter Do of 4 in. and an inne diameter Di of 2.5 in. The shaft rotates at 46 rpm for one hour each day. It is supporte by two bearings and loaded in the middle with a load W of 5500 lb:. The distance betwe the bearings Lis 78 in. The maximum tensile stress due to bending for this type of cycl loading is calculated using the following equation: 8WLD. #(D; – D{) What is the stress ratio for this type of cyclic loading? Would this shaft last for one ye: assuming a safety factor of 2?

Mechanics of Materials (MindTap Course List)
9th Edition
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Barry J. Goodno, James M. Gere
Chapter3: Torsion
Section: Chapter Questions
Problem 3.12.3P: A full quarter-circular fillet is used at the shoulder of a stepped shaft having diameter D2= 1.0...
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A hollow shaft made from AISI 4340 steel has an outer diameter D. of 4 in. and an inner
diameter Di of 2.5 in. The shaft rotates at 46 rpm for one hour each day. It is supported
by two bearings and loaded in the middle with a load W of 5500 lbf. The distance between
the bearings Lis 78 in. The maximum tensile stress due to bending for this type of cyclic
loading is calculated using the following equation:
8WLD,
#(Dg – D{)
What is the stress ratio for this type of cyclic loading? Would this shaft last for one year
assuming a safety factor of 2?
Transcribed Image Text:A hollow shaft made from AISI 4340 steel has an outer diameter D. of 4 in. and an inner diameter Di of 2.5 in. The shaft rotates at 46 rpm for one hour each day. It is supported by two bearings and loaded in the middle with a load W of 5500 lbf. The distance between the bearings Lis 78 in. The maximum tensile stress due to bending for this type of cyclic loading is calculated using the following equation: 8WLD, #(Dg – D{) What is the stress ratio for this type of cyclic loading? Would this shaft last for one year assuming a safety factor of 2?
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