The Experts below are selected from a list of 270 Experts worldwide ranked by ideXlab platform
G. M. Ivanchenko - One of the best experts on this subject based on the ideXlab platform.
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Critical states in the interaction of discontinuous waves with interfaces between Elastic Media
International Applied Mechanics, 2009Co-Authors: V. I. Gulyaev, G. M. IvanchenkoAbstract:The ray method is used to develop a procedure for studying the kinematics and dynamics of the interaction of discontinuous waves with interfaces between Elastic Media. The critical states of such interactions are analyzed. For the cases of a free surface and two surfaces contacting with and without sliding, it is established that the kinematic and dynamic conditions for critical states to occur are satisfied simultaneously
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Diffraction of discontinuous waves by ellipsoidal interfaces of transversely isotropic Elastic Media
International Applied Mechanics, 2004Co-Authors: V. I. Gulyaev, P. Z. Lugovoi, G. M. IvanchenkoAbstract:Discontinuous waves penetrating the interfaces of transversely isotropic Elastic Media are studied using the ray-path method. The cases where such waves interact with curvilinear reflectors and with biconvex and biconcave lenses are considered. It is shown that discontinuous waves can focus or scatter depending on the physical properties and sequence of the Media under consideration.
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Diffraction of a Plane Discontinuos Wave in Layered Anisotropic Elastic Media
Mechanics of Composite Materials, 2003Co-Authors: V. I. Gulyayev, G. M. IvanchenkoAbstract:The problem of transformation of the front of a plane longitudinal shock wave by curvilinear interfaces of layered anisotropic Elastic Media with different mechanical properties is considered. To solve the nonlinear Snell equations, the approach based on a synthesis of the Newton method and the algorithm of parametric continuation of a solution is used. The cases of focusing and scattering of rays by convex and concave interfaces of layered composite Media and by convex lenses are investigated. Numerical examples are given for various ratios between the parameters of the Elastic Media.
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Interaction of shock-wave fronts with interface of transversely isotropic Elastic Media
International Applied Mechanics, 1999Co-Authors: V. I. Gulyaev, G. M. Ivanchenko, P. Z. Lugovoi, E. V. YakovenkoAbstract:A problem of diffraction of an incident-wave front interacting with an interface is considered within the framework of shock-wave theory for anisotropic Elastic Media. An approach to geometrical construction of reflected- and refracted-wave fronts using methods of continuation by a parameter is proposed for solution of Snellius generalized nonlinear equations. A numerical example is presented.
Luis Chacon - One of the best experts on this subject based on the ideXlab platform.
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chns a case study of turbulence in Elastic Media
arXiv: Fluid Dynamics, 2019Co-Authors: Xiang Fan, P H Diamond, Luis ChaconAbstract:Recent progress in the study of Cahn-Hilliard Navier-Stokes (CHNS) turbulence is summarized. This is an example of \textit{Elastic turbulence}, which can occur in Elastic (i.e. self-restoring) Media. Such Media exhibit memory due freezing-in laws, as does MHD, which in turn constrains the dynamics. We report new results in the theory of CHNS turbulence in 2D, with special emphasis on the role of structure (i.e. `blob') formation and its interaction with the dual cascade. The evolution of a concentration gradient in response to a single eddy -- analogous to flux expulsion in MHD -- is analyzed. Lessons learned are discussed in the context of MHD and other Elastic Media.
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chns a case study of turbulence in Elastic Media
Physics of Plasmas, 2018Co-Authors: Xiang Fan, P H Diamond, Luis ChaconAbstract:Recent progress in the study of Cahn-Hilliard Navier-Stokes (CHNS) turbulence is summarized. This is an example of Elastic turbulence, which can occur in Elastic (i.e., self-restoring) Media. Such Media exhibit memory due to freezing-in laws, as does MHD, which in turn constrains the dynamics. We report new results in the theory of CHNS turbulence in 2D, with special emphasis on the role of structure (i.e., “blob”) formation and its interaction with the dual cascade. The evolution of a concentration gradient in response to a single eddy—analogous to flux expulsion in MHD—is analyzed. Lessons learned are discussed in the context of MHD and other Elastic Media.
A.i. Potapov - One of the best experts on this subject based on the ideXlab platform.
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Longitudinal strain waves in non-linearly-Elastic Media with couple stresses
International Journal of Non-Linear Mechanics, 1993Co-Authors: V.i. Erofeyev, A.i. PotapovAbstract:Abstract Non-linear dynamics equations as well as the laws of energy and wave momentum variation for Elastic Media with couple stresses are deduced. Peculiarities of the plane periodic and solitary waves have been analysed and the problem of their stability with respect to transverse perturbations is discussed.
Mohamed Haddar - One of the best experts on this subject based on the ideXlab platform.
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Guided wave propagation in uncertain Elastic Media.
Ultrasonics, 2012Co-Authors: Faker Bouchoucha, Mohamed Ichchou, Mohamed HaddarAbstract:In this paper, the authors present a numerical approach to study the guided Elastic wave propagation in uncertain Elastic Media. Stochastic wave finite element method (S.W.F.E.M) formulation with consideration of spatial variability of material and geometrical properties is developed for probabilistic analysis of structures. The uncertain material properties are modelled as a set of random fields. The idea is to consider the random fields as a supplementary dimension of the problem through the spatial discretisation using the finite elements process. The stochastic forced response is formulated to study the stochastic dynamical behavior of the structure using the appropriate boundary conditions. In this work, a SWFE approach is employed in order to analyse the stochastic wave propagation and the numerical accuracy. The computational efficiency of the method is demonstrated by comparison with Monte Carlo simulations.
V. I. Gulyaev - One of the best experts on this subject based on the ideXlab platform.
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Critical states in the interaction of discontinuous waves with interfaces between Elastic Media
International Applied Mechanics, 2009Co-Authors: V. I. Gulyaev, G. M. IvanchenkoAbstract:The ray method is used to develop a procedure for studying the kinematics and dynamics of the interaction of discontinuous waves with interfaces between Elastic Media. The critical states of such interactions are analyzed. For the cases of a free surface and two surfaces contacting with and without sliding, it is established that the kinematic and dynamic conditions for critical states to occur are satisfied simultaneously
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Diffraction of discontinuous waves by ellipsoidal interfaces of transversely isotropic Elastic Media
International Applied Mechanics, 2004Co-Authors: V. I. Gulyaev, P. Z. Lugovoi, G. M. IvanchenkoAbstract:Discontinuous waves penetrating the interfaces of transversely isotropic Elastic Media are studied using the ray-path method. The cases where such waves interact with curvilinear reflectors and with biconvex and biconcave lenses are considered. It is shown that discontinuous waves can focus or scatter depending on the physical properties and sequence of the Media under consideration.
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Interaction of shock-wave fronts with interface of transversely isotropic Elastic Media
International Applied Mechanics, 1999Co-Authors: V. I. Gulyaev, G. M. Ivanchenko, P. Z. Lugovoi, E. V. YakovenkoAbstract:A problem of diffraction of an incident-wave front interacting with an interface is considered within the framework of shock-wave theory for anisotropic Elastic Media. An approach to geometrical construction of reflected- and refracted-wave fronts using methods of continuation by a parameter is proposed for solution of Snellius generalized nonlinear equations. A numerical example is presented.