The cast-iron bell-crank lever depicted in the figure is acted upon by forces F 1 of 250 lbf and F 2 of 333 lbf. The section A - A at the central pivot has a curved inner surface with a radius of r i...

The cast-iron bell-crank lever depicted in the figure is acted upon by forcesF
₁ of 250 lbf andF
₂ of 333 lbf. The sectionA-Aat the central pivot has a curved inner surface with a radius ofr_i= 1 in. Estimate the stresses at the inner and outer surfaces of the curved portion of the lever.