Value which shows how much bending stress can be exerted on a structural member. The more resistance, the higher the modulus. Section modulus differs with the size and shape of a structural member. The same type of member will have a higher section modulus if it is heavier than the same type of member which is lighter because the heavier one will be stiffer.

A physical property of a structural member. It is used to design and basically describes the bending strength of a member.

A measure of a frame's strength based entirely upon the height, width, thickness, and configuration of the side rails. This is calculated at the point of maximum stress, generally directly behind the cab. The measurement can only be used to compare frames of like materials, not material strength.

Section modulus is a measure of a frame's strength based solely upon the height, width, thickness, and configuration of the side rails. It is calculated at the point of maximum stress, which is usually directly behind the cab. It is not a measure of material strength and can only be used to compare frames of like materials.

The section modulus is a property of the cross section, which is used to determine the bending stress in the extreme fibre of the section.

A property of a cross sectional shape, which depends on shape, and orientation. Section modulus is usually denoted S, and S = I/c, where I = moment of inertia about an axis through the centroid, and c is the distance from the centroid to the extreme edge of the section.

A measure of a beam's ability to resist bending loads without failure.

See Modulus (for Elastic Modulus and Plastic Modulus).

An indicator of frame side-rail strength based on depth, flange width and thickness dimensions; does not take into account frame material so, SM is a measure of comparability only for rails made of the same material.