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(a) Maximum bending stress occurs at inside fibre of sections with
ri=75mm (refer figure 4.5)
(b) rn=(1/4)* (sqrt(ro) + sqrt(ri))^2
=0.08705 m
(c) e=R-rn =0.0004 m
(d) Si=(M*hi)/(A*e*ri) =41.0 MN/m^2
(e)Maximum shear stress occurs at every point from A to B and from C to D
Maximum shear stress=20.5 MN/m^2
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