Strain (Strain Tensor)
Strain (Strain Tensor) : Change in shape and/or size of a infinitesimal material element per unit length or volume. In elasticity theory, the strain is generally referred to a reference state in which the material has zero stresses (natural configuration). For small deformation, the complete description of strain at a point in three dimensions requires the specification of the extensions (change in length/length) in the directions of each of the reference axes and the change in the angle between lines which were parallel to each pair of reference axes in the reference state. Diagonal components of the strain tensor describe normalized changes in length; off-diagonal components describe changes in angle. See Johnston and Linde (2002). strain events Episodic strain transients recorded by strainmeters. See Johnston and Linde (2002)
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