Force exerted by stretched or contracted material

Description

In continuum mechanics, stress is a physical quantity that expresses the internal forces that neighbouring particles of a continuous material exert on each other. . Any strain (deformation) of a solid material generates an internal elastic stress, analogous to the reaction force of a spring, that tends to restore the material to its original non-deformed state. The force exerted by a material when contracted or stretched is related to the amount by which the length of the object changes, the original cross-sectional area through which the force is applied and the original length of the object.