MANU 3312 Design of Machine Components Assignment

Reference no: EM132554772

MANU 3312 Design of Machine Components - International Islamic University Malaysia

Question 1

A shaft is loaded in bending and torsion such that
Ma = 600 lbf·in, Ta = 400 lbf·in, Mm =500 lbf·in, and Tm = 300 lbf·in.
For the shaft, Su = 100 kpsi and Sy = 80 kpsi, and a fully corrected endurance limit of Se = 30 kpsi is assumed.

Let Kf = 2.2 and Kf,s = 1.8. With a design factor of 2.0, determine the minimum acceptable diameter of the shaft using the
(a) DE-Gerber criterion.
(b) DE-elliptic criterion.
(c) DE-Soderberg criterion.
(d) DE-Goodman criterion.

Discuss and compare the results.

Question 2

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 metric 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 1226 MPa ultimate tensile strength and 1130 MPa yield strength with a Brinell hardness not less than 368. At the shoulder the shaft is subjected to a completely reversed bending moment of 70 N·m, accompanied by a steady torsion of 45 N·m. Use a design factor of 2.5 and size the shaft for an infinite life.

Reference no: EM132554772

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