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An axially loaded straight cylindrical bar is to be made of 4 3 2 0 ; HB 2 7 5 steel, with fatigue properties as

An axially loaded straight cylindrical bar is to be made of

4320

; HB

275

steel, with fatigue properties as shown in Figure

1 .

The bar is to be subjected to a completely reversed axial force of

30

kN maximum. Fatigue is the governing failure mode. If infinite life is desired for this part, what is the minimum diameter that the bar should be made?

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