For a curved bar of rectagular cross section subjected to a bending couple M, show that the radial stress at the neutral surface is
and compute the value of σr for the curved bar of Concept Applications 4.10 and 4.11. (Hint: consider the free-body diagram of the portion of the beam located above the neutral suface.)
Fig. P4.191
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Mechanics of Materials, 7th Edition
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