2015/01/05 by A. S. Yurkov, Yurkov, A. S.
Engineering · Materials Science · #Elasticity and Wave Propagation #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Mathematical Physics (math-ph) #Nonlocal and gradient elasticity in micro/nano structures #Thermoelastic and Magnetoelastic Phenomena
paper · pdf · doi:10.48550/arxiv.1501.00822
openalex publication_date 2015/01/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
When describing elastic deformations of a body sometimes it is worth to take in account elastic spatial dispersion. If spatial dispersion is weak, as usually happens, then it can be reduced to dependence of thermodynamic potential on strain gradients. Such a dependence may be worth in association with small body size which imply large gradients. Besides, the inclusion of this dispersion leads to physical phenomena absent without it. An example of the latter is flexoelectricity. Remarkable fact is that while the derivation of differential equations of elastic equilibrium can be made by ordinary means in this case, the derivation of boundary conditions for them is less trivial task. This is due to the fact that strain gradients should be represented in terms of second gradients of independently varied elastic displacements. Detailed consideration of this problem is the subject of this paper.