Elastic aftereffect is a physical property , consisting in the fact that the deformation of the body does not immediately reach a value proportional to the applied stress , but slowly reaches the required value. It arises when the stress of the deforming force increases ( elastic load after- effect) and when it decreases, the elastic after-load discharge .
Characteristic of bodies with a large number of internal voids (pores, cracks). For metals, the elastic aftereffect increases with increasing temperature.
The increase in deformation occurs according to the exponential law. The duration of the elastic aftereffect is estimated using the relaxation time — the time interval after which the strain value equals 1–1 / e fractions of the maximum value.
The relaxation time usually does not exceed 1 s.
Literature
- I.L. Knunyants. Brief chemical encyclopedia. - Ripol Classic, 2013. - p. 343. - 596 p.
- R.V. Paul. Mechanics, acoustics and the theory of heat. - Ripol Classic, 2013. - p. 160. - 490 p. - ISBN 5458431251 . - ISBN 9785458431255 .