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Semi-circular grooves of radius r must be milled as shown in the top and bottom portions of a steel member. Using an allowable stress

Semi-circular grooves of radius r must be milled as shown in the top and bottom portions of a steel member. Using an allowable stress of 60 MPa, determine the maximum bending moment that can be applied to the member when the radius r of the semi-circular grooves is: (a) r = 9 mm. (b) r = 18 mm. 18 mm 108 mm M Fig. R3.2: A bar with grooves under moment.

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