WE$4.$

A press is to be so designed that the longltudinal elongation of each of the two

tension solld circular rods $A,$ as shown, does not exceed $0\mathrm{.}4$ mm when subjected

to an axial force of $44$ kN $.$

$($a$)$ Calculate the diameter of members $A.$

$($b$)$ If the yield strength of the member material is $138$ MPa $,$ are the rods safe?

$E_{\text{m}\text{a}\text{T}\text{e}\text{r}\text{i}\text{a}\text{l}}=200$GPa