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Question 1 . A solid circular cross section bar has 3 0 m m in diameter has a groove 3 m m deep with a

Question

1 .

A solid circular cross section bar has

30 m m

in diameter has a groove

3 m m

deep with a

3 m m

radius machined into it

.

the bar is made of AISI

1020

HR STEEL, and is subjected to a pure tension compression cyclic load ranging between

5

K N,

estimate numbers of cyclic to failure

?

assume

f = . 9

using modified goodman fatigue equations

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