Q.1 A crane having an approximate trapezoidal c/s is shown in fig. It is made of plain carbon steel 45C8 $(Syt=380 \ N/mm^2$) and the FOS is 3.5. Determine the load carrying capacity of hook.

1. $\sigma_{max}$ =$\frac{Syt}{FOS}$ = $\frac{380}{3.5} = 108.57 \ N/mm^2$

2.

$\;$(I) PSG 6.3

$r_{n}$ = $\frac{(\frac{b_{i}+b_{o}}{2})\;h}{(\frac{b_{i}.r_{o}-b_{o}.r_{i}}{h})\;ln\;(\frac{r_{o}}{r_{i}})-(b_{i}-b_{o})}$ …