Neutral axis is the axis at which stress is

Explanation:

• When loaded by a bending force, the beam bends so that the inner surface is in compression and the outer surface is in tension.
• The neutral plane is the surface within the beam between these zones, where the material of the beam is not under stress (either compression or tension).
• As there is no lengthwise stress force on the neutral plane, there is no strain so when the beam bends, the length of the neutral plane remains constant.
• The neutral axis is an axis in the cross-section of a beam (a member resisting bending) or shaft along which there are no longitudinal stresses or strains.
• If the section is symmetric, isotropic, and is not curved before a bend occurs, then the neutral axis is at the geometric centroid.
• All fibers on one side of the neutral axis are in a state of tension, while those on the opposite side are in compression.