A. A. Vakulenko
Russian Academy of Sciences
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Featured researches published by A. A. Vakulenko.
Physics of the Solid State | 1998
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
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
A. V. Zakharov; A. A. Vakulenko
Physics of the Solid State | 2001
A. A. Vakulenko; S. A. Kukushkin; A. V. Shapurko
\widehat n
Physics of the Solid State | 2011
M. Ilk Capar; A. Nar; A. V. Zakharov; A. A. Vakulenko
Physics of the Solid State | 2009
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
A. V. Zakharov; A. A. Vakulenko
Physics of the Solid State | 2012
A. V. Zakharov; A. A. Vakulenko
\widehat n
Physics of the Solid State | 2011
A. V. Zakharov; A. A. Vakulenko
Physics of the Solid State | 2011
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.