A couple of moment M = 2 kN.m is to be applied to the end of a steel bar. Determine the maximum stress in the bar
(a) if the bar is designed with grooves having semicircular portions of radius r = 10 mm, as shown in Fig. a,
(b) if the bar is redesigned by removing the material to the left and right of the dashed lines as shown in Fig. b.
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