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Bending moment
A bending moment is a measure of the average internal stress induced in a structural element when an external force or moment is applied to the element causing the element to bend.
The internal stresses in a cross-section of a structural element can be resolved into a resultant force and a resultant couple. For equilibrium, the moment created by external forces (and external moments) must be balanced by the couple induced by the internal stresses. The resultant internal couple is called the bending moment while the resultant internal force is called the shear force (if it is transverse to the plane of element) or the normal force (if it is along the plane of the element).
A bending moment is a measure of the average internal stress induced in a structural element when an external force or moment is applied to the element causing the element to bend.
The internal stresses in a cross-section of a structural element can be resolved into a resultant force and a resultant couple. For equilibrium, the moment created by external forces (and external moments) must be balanced by the couple induced by the internal stresses. The resultant internal couple is called the bending moment while the resultant internal force is called the shear force (if it is transverse to the plane of element) or the normal force (if it is along the plane of the element).
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