Читать книгу Engineering Physics of High-Temperature Materials - Nirmal K. Sinha - Страница 30

Mechanically or thermodynamically induced stress deforms a material from its original shape. Stress‐induced deformation in a material, whether it is stated clearly or not, is historically assumed to be divided into two major parts – an elastic part and an inelastic part. Instantaneously occurring deformation of the lattice structure on the rapid application of a load or instantaneously recoverable deformation on the rapid removal of a load is known as an elastic response. Perhaps the latter description is more appropriate, because inelastic deformation may occur during loading, but any inelastic deformation is “not expected” to recover on unloading. The use of the words “not expected” is associated with the idea that it is rather complicated and sounds vague. This is because the term “inelastic” in the multidisciplinary field of classical engineering, as mentioned earlier, is associated with part of the deformation that is “really a deviation” from the elastic behavior.