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The section of shaft shown in the figure is to be designed to approximate relative sizes of d = 0.75D and r = D/20 with diameter d conforming to that of standard rolling- bearing bore sizes. The shaft is to be made of SAE 2340 steel, heat-treated to obtain minimum strengths in the shoulder area of 175 kpsi ultimate tensile strength and 160 kpsi yield strength with a Brinell hardness not less than 370. At the shoulder the shaft is subjected to a completely reversed bending moment of 600 lbf • in, accompanied by a steady torsion of 400 lbf • in. Use a design factor of 2.5 and size the shaft for an infinite life using the DE-Goodman criterion. 7-3

The section of shaft shown in the figure is to be designed to approximate relative sizes of d = 0.75D and r = D/20 with diameter d conforming to that of standard rolling- bearing bore sizes. The shaft is to be made of SAE 2340 steel, heat-treated to obtain minimum strengths in the shoulder area of 175 kpsi ultimate tensile strength and 160 kpsi yield strength with a Brinell hardness not less than 370. At the shoulder the shaft is subjected to a completely reversed bending moment of 600 lbf • in, accompanied by a steady torsion of 400 lbf • in. Use a design factor of 2.5 and size the shaft for an infinite life using the DE-Goodman criterion. 7-3

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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7-3 The section of shaft shown in the figure is to be designed to approximate relative sizes of d = 0.75D and r = D/20 with diameter d conforming to that of standard rolling- bearing bore sizes. The shaft is to be made of SAE 2340 steel, heat-treated to obtain minimum strengths in the shoulder area of 175 kpsi ultimate tensile strength and 160 kpsi yield strength with a Brinell hardness not less than 370. At the shoulder the shaft is subjected to a completely reversed bending moment of 600 lbf • in, accompaniced by a steady torsion of 400 lbf · in. Use a design factor of 2.5 and size the shaft for an infinite life using the DE-Goodman criterion. Problem 7-3 Section of a shaft containing a grinding-relief groove. Unless otherwise specified, the diameter at the root of the groove d, =d - 2r, and though the section of diameter d is ground, the root of the groove is still a machined surface.
Transcribed Image Text:7-3 The section of shaft shown in the figure is to be designed to approximate relative sizes of d = 0.75D and r = D/20 with diameter d conforming to that of standard rolling- bearing bore sizes. The shaft is to be made of SAE 2340 steel, heat-treated to obtain minimum strengths in the shoulder area of 175 kpsi ultimate tensile strength and 160 kpsi yield strength with a Brinell hardness not less than 370. At the shoulder the shaft is subjected to a completely reversed bending moment of 600 lbf • in, accompaniced by a steady torsion of 400 lbf · in. Use a design factor of 2.5 and size the shaft for an infinite life using the DE-Goodman criterion. Problem 7-3 Section of a shaft containing a grinding-relief groove. Unless otherwise specified, the diameter at the root of the groove d, =d - 2r, and though the section of diameter d is ground, the root of the groove is still a machined surface.
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