Stresses
Stress being generated Stress is the property by which a body tends to resist the changes in its dimension when an external force is applied on a body. It is usually denoted by σ( sigma). Reason: Stress traces its origin from the molecular and atomic level , i . e, the microscopic level. When a force is applied under elastic limit, work is done in order to overcome the molecular forces of attraction and this work is stored in the form of elastic potential energy. This give rise to opposing forces which tries to resist the externally applied forces. When the forces are removed the distorted lattice of molecules regains its shape, depending upon the magnitude of external force and the property of material. If the force, however small it may be, exceeds the elastic limit of the body then the original shape of the body is not regained and vice versa. Stresses are forces which are confined inside the geometry of the body and no such devices exist til...