Numerical modeling of spalling brittle fracture along the (0001) plane in HCP-single crystals under shock loading

Numerical modeling of spalling brittle fracture along the (0001) plane in a zinc single crystal under shock loading by an aluminum projectile was performed in the work. Numerical modeling was carried out by the finite element method in a three-dimensional statement. The mathematical model allows to take into account the anisotropy of bulk compressibility in a single crystal of zinc, auxeticity, anisotropy of the propagation velocities of elastic longitudinal and volume waves. Stresses are determined on the basis of a comparison of velocity profiles of the rear surfaces of targets from zinc single crystal in mutually perpendicular directions when it is destroyed along the (0001) plane in natural experiments and numerical simulation

Modelling of the deformation of highly porous metals and alloys under dynamic loading

The study represents the analysis of numerical simulation of the failure of aluminum targets made of highly porous or solid 2024 alloy under dynamic loading. The calculations employed the finite elements method in three-dimensional formulation with the use of proprietary programs. The article presents the results of the numerical simulation of Taylor’s test for the projectile made of highly porous aluminum 2024 alloy at the velocities of 75 to 175 m/s. These results are in a good agreement with the results of the experiments. The peculiarities of the destruction of highly porous aluminum targets are shown

ОСНОВНІ СКЛАДОВІ ЗДОРОВ’Я

In the article analyzes the basic concepts and approaches to health positions. It is shown that qualitative and quantitative characteristics of both health and illness have a fairly wide range of interpretation. It was summed, that the health is a multifactorial concept, which become the main strategy of life to improve the vitality of the body.У статті розглянуто поняття та основні підходи до позиції здоров'я. Показано, що якісні і кількісні характеристики як здоров'я, так і хвороби мають досить широкий діапазон тлумачення. Підсумовано, що здоров’я є мультифакторним поняттям, яке виступає основною стратегією життя людини з метою підвищення життєстійкості організму

Numerical simulation of the fractures of anisotropic materials characterized by the high degree of anisotropy of elongation at break

The failure criteria of anisotropic materials, the criteria being expressed via deformations, are rarely applied in practice, and are usually used for low-ductility materials. Another situation involves the simulation of failures in materials with the high anisotropy of mechanical properties and that suffer elastic-brittle fracture. For such materials the failure criteria are formulated using ultimate strains and strain tensor invariants. For simulating the fractures of materials that are characterized by the anisotropy of strength properties, the failure criteria are applied with the critical values of stresses and strains, as well as their intensities. Using the value of cumulative plastic strain as a failure criterion does reflect the anisotropy of elastic and plastic properties of a material, but it does not reflect that of the strength properties. The application of this method allows accounting the total plastic strain induced by tension and compression in the conditions of the wave strain of targets during their impact loading

Structural Characteristic of the German-English Hybrids of the Information Security Sphere

The article describes the results of structural analysis of the German-English hybrid terms of the information security sphere. The obtained data testify to the serious impact of the English influence on German primarily in the peripheral sphere of the German language stock. The hybridity is stated as a result of aggregation of the literary German lexical system and language mixing owning to an invasive borrowing process

Onomatological analysis of the technonyms in the sphere of energetics (based on the Russian, English and Chinese languages)

The article deals with the results of the onomatological analysis of the names of renewable energy facilities in the Russian, English and Chinese languages. The relevance of the study is determined by the trends in the development of these languages and their onomasiological foundation, which require focused attention of linguists in the context of an avalanche-type enlargement of terminological spheres. The results of the research can be useful for a wide range of specialists in humanities, including interpreters working with terminological thesauri in the sphere of renewable and resource energy

Numerical modeling of spalling brittle fracture along the (0001) plane in HCP-single crystals under shock loading

Numerical modeling of spalling brittle fracture along the (0001) plane in a zinc single crystal under shock loading by an aluminum projectile was performed in the work. Numerical modeling was carried out by the finite element method in a three-dimensional statement. The mathematical model allows to take into account the anisotropy of bulk compressibility in a single crystal of zinc, auxeticity, anisotropy of the propagation velocities of elastic longitudinal and volume waves. Stresses are determined on the basis of a comparison of velocity profiles of the rear surfaces of targets from zinc single crystal in mutually perpendicular directions when it is destroyed along the (0001) plane in natural experiments and numerical simulation

Onomatological analysis of the technonyms in the sphere of energetics (based on the Russian, English and Chinese languages)

The article deals with the results of the onomatological analysis of the names of renewable energy facilities in the Russian, English and Chinese languages. The relevance of the study is determined by the trends in the development of these languages and their onomasiological foundation, which require focused attention of linguists in the context of an avalanche-type enlargement of terminological spheres. The results of the research can be useful for a wide range of specialists in humanities, including interpreters working with terminological thesauri in the sphere of renewable and resource energy

Neutron Age Determination in Fast Reactor Materials using the Group Method

The article deals with the methods of identifying fast neutron age in sodium (Na) and uranium-238 (238U); describes the model of advanced and effective fast neutron nuclear reactors (FN), where Na is a coolant while 238U is involved in the fuel cycle in large quantities; justifies the choice of the group method for calculating the neutron age value in the substances mentioned above that can show the accuracy of the used constants for Na and estimate various versions of multilevel description of neutron moderation in 238U – the most powerful resonance absorber of the neutron reactor active zone

Electric Equipment Diagnosis based on Wavelet Analysis

Due to electric equipment development and complication it is necessary to have a precise and intense diagnosis. Nowadays there are two basic ways of diagnosis: analog signal processing and digital signal processing. The latter is more preferable. The basic ways of digital signal processing (Fourier transform and Fast Fourier transform) include one of the modern methods based on wavelet transform. This research is dedicated to analyzing characteristic features and advantages of wavelet transform. This article shows the ways of using wavelet analysis and the process of test signal converting. In order to carry out this analysis, computer software Mathcad was used and 2D wavelet spectrum for a complex function was created