고체역학 (Gere) — Stresses in Beams (Advanced Topics): Problem 6.10-17

6.10-17 A HE 260A wide-flange beam is subjected to a bending moment M of such magnitude that the flanges yield but the web remains linearly elastic. (a) Calculate the magnitude of the moment M if the yield stress is \(\sigma_Y = 250 \text{ MPa}\). (b) What percent of the moment M is produced by the elastic core?