The section of the shaft shown in the figure is to be designed to approximate relative sizes of d= 0.75Dand r = D/20 with diameter d conforming to that of standard metric rolling bearing sizes. The shaft is tobe made of SAE 2340 steel, heat-treated to obtain minimum strengths in the shoulder area of 175 kpsiultimate tensile strength and 160 kpsi yield strength with a Brinell hardness not less than 370. At theshoulder the shaft is subjected to a completely reversed bending moment of 600 lb-in, accompanied by asteady torsion of 400 lb-in. Use a design safety factor of 2.5 and size the shaft for infinite life.** Note: Without a fully corrected endurance limit, we will need to make an initial guess of the diameterat the groove to calculate our Marin factors. Take the initial guess d, (i.e., d-2r) = 0.799 inches.

To given that,d=0.75Dr=D20Sut=175kpsiSy=160kpsiHB≥370As we know…

ne section of the shaft shown in the figure is to be designed to approx dr=D/20 with diameter d conforming to that of standard metric rol made of SAE 2340 steel, heat-treated to obtain minimum strengths timate tensile strength and 160 kpsi yield strength with a Brinell hard oulder the shaft is subjected to a completely reversed bending mome eady torsion of 400 lb-in. Use a design safety factor of 2.5 and size

ne section of the shaft shown in the figure is to be designed to approx dr=D/20 with diameter d conforming to that of standard metric rol made of SAE 2340 steel, heat-treated to obtain minimum strengths timate tensile strength and 160 kpsi yield strength with a Brinell hard oulder the shaft is subjected to a completely reversed bending mome eady torsion of 400 lb-in. Use a design safety factor of 2.5 and size

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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Concept explainers

Combined Loading

Any functioning component, such as machine parts, structural members, pressure vessels, and so on, are all under the influence of more than one force. When anybody is under the influence of more than one force such as shear forces, bending moments, axial forces, torsion, and so on, then such body is said to be under combined loading. A very practical example of combined loading is the crankshaft of an internal combustion engine (IC engine). The crankshaft of the IC engine is under high rpm, which is caused due to the torsional forces. Due to the presence of piston, counterbalances, and internal imbalances, the crankshaft experiences lateral forces and due to the rise in temperature, the crankshaft undergoes thermal expansion, which pulls the crankshaft along the axial direction and lateral direction. The presence of unbalanced loads along the periphery of the crankshaft also induces a bending moment.

Question

The section of the 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 metric rolling bearing 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 lb-in, accompanied by a
steady torsion of 400 lb-in. Use a design safety factor of 2.5 and size the shaft for infinite life.
** Note: Without a fully corrected endurance limit, we will need to make an initial guess of the diameter
at the groove to calculate our Marin factors. Take the initial guess d, (i.e., d-2r) = 0.799 inches.

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