Nonequilibrium processes in condensed media. Part 2. Structural instability induced by shock loading

Хантулева, Т. А.; Meshcheryakov, Yu. I.

doi:10.1134/s1029959916010070

Cited by 15 publications

(11 citation statements)

References 6 publications

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“…As a result, the surface becomes inhomogeneous, because surface irregularities are generally “softer” than those of the base material [54]. Under such conditions, the surface layer is an effective generator of dislocations [47,55]. As a result, small folds disappear on the surface and large ones become smoother, which accelerates the macrolocalization of strain and leads to the fracture of the specimen.…”

Section: Research Resultsmentioning

confidence: 99%

Variation of Relief Topography and Hardness of Surface Layers of Materials Due to Impact-Oscillatory Loading

et al. 2019

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It was shown previously that cyclic loading can be used to extend the fatigue life of sheet plastic materials subjected to the preliminary impact-oscillatory loading. This type of loading causes dynamic non-equilibrium processes (DNP) in materials, which lead to the formation of dissipative structures in materials and on their surface. The density of these dissipative structures is less than that of the base metal. In this paper, the results of investigations into the relief and hardness of surface layers modified by impact-oscillatory loading are analyzed on the example of five structural materials. The signs of a regular, orderly system of microextrusions formed on flat surfaces of all materials due to DNP are considered along with the alignment of roughness parameters Rz and Ra of relief profiles. The effect of impact-oscillatory loading is one of the main causes that lead to the extension of the fatigue life of materials.

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Section: Research Resultsmentioning

confidence: 99%

Variation of Relief Topography and Hardness of Surface Layers of Materials Due to Impact-Oscillatory Loading

et al. 2019

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“…Vortex-wave turbulence structures in fluid, gas, multiphase and plastic streams Khantuleva, 2015, Khantuleva andMeshcheryakov, 2016] can also be described in terms of birth and dissolution of clusters. Although cluster synchronization dramatically reduces the dimension of a control system, this dimension (and structure of the state vector) is time-varying.…”

Section: Forced Clustering and Slow-fast Dynamicsmentioning

confidence: 99%

Evolution of clusters in large-scale dynamical networks

Proskurnikov

Granichin

2018

CAP

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Recent tremendous progress in electronics, complexity theory and network science provides new opportunities for intellectual control of complex large-scale systems operating in turbulent environment via networks of interconnected miniature devices, serving as actuators, sensors and data processors. Actual dynamics of the resulting control systems are too sophisticated to be examined controlled by traditional methods, which primarily deal with ordinary differential equations. However, their complexity can be dramatically reduced by fast processes, organizing the elementary units of the system (called agents) into relatively small number of clusters. The clusters emerge and deteriorate in response to changes in the environment, and the processes of their formation and destruction are very short in time. During the periods of the clusters’ existence, the system’s dynamics is essentially low-dimensional due to synchronization between the agents in each cluster. An enormously complicated system is thus reduced to a finite-dimensional model with time-varying structure of the state vector. The low-dimensionality of the reduced model allows to control it by using classical methods, e.g. model-predictive or adaptive control. This philosophy of complex systems control is illustrated on an experimental setup, called the “airplane with feathers”. The wings of this airplane are equipped with arrays of microsensors, microcomputers, and microactuators (“feathers”). The feathers self-organize into clusters by using a multi-agent consensus protocol; the aim of this coordination is to reduce the perturbing forces, affecting the airplane in a turbulent flow.

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“…At the same time, there is a certain tendency to a reduction in the plasticity and crack resistance of alloys and an increase in their sensitivity to stress concentrators as the strength of such alloys increases. That is why methods for modifying their properties which make it possible to preserve the high strength of these alloys while increasing their plasticity are very relevant [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Improving of Mechanical Properties of Titanium Alloy VT23 due to Impact-Oscillatory Loading and the Use of Carbon Nano-Solution

Чаусов

Khyzhun

Brezinová

et al. 2019

Metals

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Improvement in the mechanical properties of sheet two-phase high-strength titanium alloy VT23 due to impact-oscillatory loading and the use of carbon nanosolutions at room temperature was tested experimentally. It was shown that in addition to obtaining a significant increase in the initial plastic deformation of the alloy, it is possible to strengthen the surface layers of the alloy by a factor of 8.4% at a time via the impulse introduction of energy into the alloy and the use of carbon nanosolutions. Using X-ray photoelectron spectroscopy (XPS), it was first found that strengthening of the surface layers of the titanium alloy at a given load, in line with using a carbon nanosolution, leads to the formation of a mixture of titanium oxide and titanium carbide or oxycarbide of type TiO2−xCx on the surface.

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Nonequilibrium processes in condensed media. Part 2. Structural instability induced by shock loading

Cited by 15 publications

References 6 publications

Variation of Relief Topography and Hardness of Surface Layers of Materials Due to Impact-Oscillatory Loading

Variation of Relief Topography and Hardness of Surface Layers of Materials Due to Impact-Oscillatory Loading

Evolution of clusters in large-scale dynamical networks

Improving of Mechanical Properties of Titanium Alloy VT23 due to Impact-Oscillatory Loading and the Use of Carbon Nano-Solution

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