Assume that the two beams in Problem 4.14 unload elastically from the fully plastic state. Determine the residual stress at the bottom of each beam.
Problem 4.14
The two beam cross sections shown in Figure P4.l4 have depths h twice the widths b. The I-beam has equal flange and web thicknesses of 0.10h. The beams are made of a material with yield point Y and are subjected to a pure bending moment M. For each beam, determine the ratio M/MY, where MY is the maximum elastic moment, when yielding has penetrated to a depth of 0.10h at the top and bottom of the beams. The moment M produces compression in the top fibers of the beams.
FIGURE P4.14
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