Localized shear as a quasi-plastic mechanism of momentum transfer in liquids

O.B. Naimark, S.V. Uvarov ORCID logo , I.A. Bannikova ORCID logo , D.V. Efremov, Y.V. Bayandin ORCID logo , N.V. Dezhkunov show affiliations and emails
Received 30 November 2022; Accepted 02 February 2023;
Citation: O.B. Naimark, S.V. Uvarov, I.A. Bannikova, D.V. Efremov, Y.V. Bayandin, N.V. Dezhkunov. Localized shear as a quasi-plastic mechanism of momentum transfer in liquids. Lett. Mater., 2023, 13(2) 93-97
BibTex   https://doi.org/10.22226/2410-3535-2023-2-93-97


Video frames of the observation of the effects of hydroluminescence on hydraulic oil: the beginning of the "glow"; developed hydroluminescence; attenuation of the glow due to pressure drop.Two types of dispersion relations (DRs) in condensed media and associated momentum transfer mechanisms are discussed: gapless DRs corresponding to acoustic modes and DRs with energy (or frequency) gap. Studying the viscoelastic effects in condensed media based on the generalization of the Maxwell-Frenkel approach, the emphasis was placed on the gap states in the momentum transfer mechanisms (GMS), when the k-gap was accompanied by qualitative changes in the DRs type. In this paper, the gap states in the mechanisms of momentum transfer in liquids are associated with the effects of shear elasticity and the formation of collective modes of quasi-plastic shears under conditions of the established type of critical phenomena in the ensembles of shear defects — structural-scaling transitions. It has been found that the formation of collective shear modes, having the character of self-similar solutions of the autosoliton type, accounts for the qualitative change in the dispersion properties corresponding to the quasi-plastic momentum transfer mechanisms operating in the characteristic range of loading times. The results of comparison with the data of original experiments confirm the initiation of quasi-plastic mechanisms of momentum transfer in liquids during the formation of collective shear modes and corresponding change in dissipative properties.

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