A rectangular beam of width b and depth h is subjected to pure bending with a moment M = 1.25MY. Subsequently, the moment is released. Assume that plane sections normal to the neutral axis of the beam remain plane during deformation.
a. Determine the radius of curvature of the beam under the applied bending moment M = 1.25MY.
b. Determine the distribution of residual bending stress after the applied bending moment is released.
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