What Is a Neutral Axis?

The neutral axis refers to the intersection of the neutral layer and the cross section of the beam. In the case of plane bending and oblique bending, the normal stress value at each point on the intersection of the cross section and the stress plane is zero. This intersection is called the neutral axis.

Neutral axis

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The neutral axis refers to the intersection of the neutral layer and the cross section of the beam. In the case of plane bending and oblique bending, the normal stress value at each point on the intersection of the cross section and the stress plane is zero. This intersection is called the neutral axis.

Chinese name

Neutral axis

Foreign name

The neutral axis

Attributes

Intersection of the beam's neutral layer and cross section

Love

In the case of plane and oblique bending

Neutral axis

In the case of plane bending and oblique bending, the normal stress value at each point on the intersection of the cross section and the stress plane is zero. This intersection is called the neutral axis. When deformed, the cross section will rotate about its neutral axis. The plane consisting of the neutral axes of all sections is called the neutral plane. For plane bending, one of the pair of centroid principal axes of the cross section must be the neutral axis of a certain plane bending.

Neutral axis and neutral layer

If it is assumed that the beam is composed of countless layers of longitudinal fibers, since the cross section remains flat, it means that the longitudinal fibers gradually change from shortening to elongation. There must be a neutral layer that is neither shortened nor elongated (not subject to Pressure and not pulled). The neutral layer is the interface between the tensile and compression zones on the beam. The line of intersection between the neutral layer and the cross section is called the neutral axis, as shown in the figure. When deformed, the cross section is rotated about the neutral axis.