The beams shown in the figure are subjected to bending moments M = 2100lb-in. Each beam has a rectangular cross section with height h = 1.5in. and width b = 0.375in. (Perpendicular to the plane of the figure)
(a) For the beam with a hole at mid height, determine the maximum stresses for hole diameters d = 0.25, 0.50, 0.75, and 1.00 in.
(b) For the beam with two identical notches (inside height h1 = 1.25in.), determine the maximum stresses for notch radii R = 0.05, 0.10, 0.15, and 0.20 in.

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(a) |2R (b)