PROBLEM # $3$:

$(30$ marks$)$

The flanged joint in Figure involves a cylinder internal diameter of $250$ mm $,$ a bolt circle diameter of $350$ mm $.$ Because of the O$-$ring gasket, the effective sealing diameter is $275$ mm $.$ Both the cylinder and the cover plate are made of same material such that

$k_{\text{c}\text{y}\text{l}\text{i}\text{n}\text{d}\text{e}\text{r}}=k_{\text{c}\text{o}\text{v}\text{e}\text{r}}=3600M\frac{N}{m}$ with thickness $(t)=$

$30$ mm $.$ A total of $6$ bolts are to be used to resist a maximum internal pressure. All bolts are M$16$ x $2\mathrm{.}0$ and made of steel $(E=207$GPa $).$ All fasteners are reused having regular hexagonal nut. For standard bolt length, use Table A$-15.$

a$)$ If a separating force of $60,000N$ is applied, determine an appropriate metric $($ISO$)$ steel bolt class using a load factor of $2.$

$(20$ marks$)$

b$)$ "For the above joint, failure due to bolt yielding will occur before joint separation". Is this statement True or False? Give brief reason for your answer.

$(5$ marks$)$

c$)$ What tightening torque should be used to develop the preload if the fasteners are lubricated?

$(5$ Marks$)$