Question: A rectangular beam with semicircular notches, as shown in part (b) of the figure, has dimension h = 120mm and h1 = 100mm. The maximum

A rectangular beam with semicircular notches, as shown in part (b) of the figure, has dimension h = 120mm and h1 = 100mm. The maximum allowable bending stress in the plastic beam is σmax = 6MPa, and the bending moment is M = 150 N ∙ m.
Determine the minimum permissible width bmin of the beam.

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