Strain Definition
Strain is defined as the amount of distortion experienced by the body in the direction of force compared to the original dimension of the object. It gives an idea that how much deformation a material can undergo on applying stress. Strain defines the relative change in the shape of an object.
Strain Formula
In mathematical terms, the strain developed in a body is given by the ratio of change in the dimension of the object to the original dimension of the object.
ϵ = (Lf – Li)/Li = δL/Li
Where,
ϵ = Strain
Li = Initial Length
Lf = Final Length
δL = Change in length
Unit of Strain: Strain has no unit as it is the ratio of the same physical quantities.
Dimensional Formula of Strain: Since strain has no unit, thus it has no dimensional formula.
Difference Between Stress and Strain
Stress and Strain is an important concept in the field of Material Science and Metallurgy to get into insights about the strength of the material. When a material is put under pressure or has a load applied to it, it develops stress is developed. When a solid is put under stress, it has the ability to deform. This deformation is called Strain. The stress is the pressure per unit area of the material, and the resulting strain is the deformation that occurs as a result of this stress. Strain and stress are strongly intertwined because strain occurs solely as a result of stress.