.Deformation in is the transformation of a body from a reference configuration to a current configuration. A configuration is a set containing the positions of all particles of the body.A deformation may be caused by, (such as or ), or changes in temperature, moisture content, or chemical reactions, etc.Strain is a description of deformation in terms of relative displacement of particles in the body that excludes rigid-body motions. Different equivalent choices may be made for the expression of a strain field depending on whether it is defined with respect to the initial or the final configuration of the body and on whether the or its dual is considered.In a continuous body, a deformation field results from a field induced by applied or is due to changes in the temperature field inside the body.
Strain definition, to draw tight or taut, especially to the utmost tension; stretch to the full: to strain a rope. Apr 22, 2018 - Strain is a measure of material deformation in response to an applied force (or stress). Strain is often incorporated into a ratio of, stress divided.
The relation between stresses and induced strains is expressed by, e.g., for materials. Deformations which are recovered after the stress field has been removed are called elastic deformations. In this case, the continuum completely recovers its original configuration. On the other hand, irreversible deformations remain even after stresses have been removed. One type of irreversible deformation is plastic deformation, which occurs in material bodies after stresses have attained a certain threshold value known as the elastic limit or, and are the result of, or mechanisms at the atomic level. Another type of irreversible deformation is viscous deformation, which is the irreversible part of deformation.In the case of elastic deformations, the response function linking strain to the deforming stress is the of the material.