Question

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-ASME Elliptic criterion. Problem 7-18 Section of a shaft containing a grinding-relief groove. Unless otherwise specified, the diameter at the root of the groove dr= d-2t, and though the section of diameter d is ground, the root of the groove is still a machined surface.

Answer 1

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Fo roe Shaft a) 自- for SAで2340 slee.) 2- =o.er 0.6 nat J.ven 'Au!やume

3- 6 160 し16-15 3 3- diarneler o, shaft d=q.er în