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Dive into the research topics where A. A. Vakulenko is active.

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Featured researches published by A. A. Vakulenko.


Physics of the Solid State | 1998

Kinetics of brittle fracture of elastic materials

A. A. Vakulenko; S. A. Kukushkin

A phenomenological model is proposed for the evolution of microcavities in materials under load based on a study of the kinetics of brittle fracture in a linearly elastic deformable medium containing a microcavity. The basic principle of the model is that, during deformation of a material containing a micropore, fluctuations of its shape occur. The surface tension at the micropore-medium interface stabilizes these fluctuations but if the load exceeds a critical value, these fluctuations may begin to evolve. In so doing, they distort the shape of the microcavity. These fluctuations are none other than cracks. This concept of crack growth and their nature has a close analogy with the evolution of dendrites formed in supercooled melts as a result of the loss of stable crystal shape. An analysis is made of the laws governing the evolution of a microcavity and local loss of shape stability under steady-state pressure for the case of a sphere containing a quasispherical cavity.


Physics of the Solid State | 2016

Reorientation dynamics of nematics encapsulated in microscopic volumes in a strong electric field

A. V. Zakharov; A. A. Vakulenko; S. V. Pasechnik

We theoretically describe a new regime of reorientation of the director field


Physics of the Solid State | 2010

Orientational nematodynamics of a hybrid-oriented capillary

A. V. Zakharov; A. A. Vakulenko


Physics of the Solid State | 2001

Kinetics of pore formation upon plastic deformation of crystals with a cesium chloride structure

A. A. Vakulenko; S. A. Kukushkin; A. V. Shapurko

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Physics of the Solid State | 2011

Flexoelastic properties of polar liquid crystals

M. Ilk Capar; A. Nar; A. V. Zakharov; A. A. Vakulenko


Physics of the Solid State | 2009

Orientational nematodynamics of a compressible hybrid liquid-crystal cell

A. V. Zakharov; A. A. Vakulenko

n^ and velocity v of a nematic liquid crystal (LC) encapsulated in a rectangular cell under the action of strong electric field E directed at angle α (~π/2) to the horizontal surfaces bounding the LC cell. The numerical calculations in the framework of nonlinear generalization of the classical Eriksen–Leslie theory showed that at certain relations between the torques and momenta affecting the unit LC volume and E ≫ Eth, transition periodic structures can arise during reorientation of


Physics of the Solid State | 2008

Anomalous reorientation processes in liquid-crystal cells with hybrid orientation in response to a temperature gradient

A. V. Zakharov; A. A. Vakulenko


Physics of the Solid State | 2012

Formation of vortex flows in thin nematic cells

A. V. Zakharov; A. A. Vakulenko

\widehat n


Physics of the Solid State | 2011

The principle of non-mechanical transport of a liquid crystal in thin capillaries

A. V. Zakharov; A. A. Vakulenko


Physics of the Solid State | 2011

Surface tension of free-standing smectic films

A. V. Zakharov; A. A. Vakulenko

n^, if the corresponding distortion mode has the fastest response and, thus, suppresses all the rest of the modes, including uniform ones. The position of sites of these periodic structures is affected by the value of field E, angle α, and the character of anchoring of LC molecules to the bounding surfaces. The calculations performed for the nematic formed by 4-n-penthyl-4’-cyanobiphenyl showed that several vortexes can form in an LC cell under the action of reorientation of the nematic field; the boundaries of these vortexes are determined by the positions of periodic structure sites.

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A. V. Zakharov

Russian Academy of Sciences

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S. A. Kukushkin

Russian Academy of Sciences

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A. V. Shapurko

Russian Academy of Sciences

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A.V. Zakharov

Russian Academy of Sciences

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I. S̀liwa

Polish Academy of Sciences

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