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Strain measures the deformation experienced by a material when subjected to the stress. It is the dimensionless quantity. It expressed as the fractional change its dimensions.
Normal Strain
It is defined as the change in the dimension per unit original dimension. Normal strain measures the change in the dimension.
Normal strain has three types
1. Longitudinal strain: Dimension change occurs in the direction of loading.
2. Lateral strain: Dimension change occurs in the perpendicular direction of loading.
3. Volumetric strain: Defined as the change in the volume to its original volume.
Shear Strain
It is defined as the change in angle between two mutually perpendicular planes. Shear strain measures the change in the shape.
