At yield, the maximum stress experienced in the section (at the furthest points from the neutral axis of the beam) is defined as the flexural strength. For stresses that exceed yield, refer to article plastic bending. Also, this linear distribution is only applicable if the maximum stress is less than the yield stress of the material. In other words, any deformation due to shear across the section is not accounted for (no shear deformation). In the Euler–Bernoulli theory of slender beams, a major assumption is that 'plane sections remain plane'. The stress distribution in a beam can be predicted quite accurately when some simplifying assumptions are used. This bending moment resists the sagging deformation characteristic of a beam experiencing bending. These last two forces form a couple or moment as they are equal in magnitude and opposite in direction. In that case the whole section is divided in two parts, one in tension and one in compression, each under uniform stress field.
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