Materials Science

Items from 1 to 20 out of 116 results

article

Thermal Stressed State of Conducting Cylinders Subjected to the Electromagnetic Action in the Mode with Pulsed Modulating Signals

R. S. Musii

Materials Science > 2015 > 50 > 4 > 496-506

We formulate dynamic plane axisymmetric problems of thermomechanics for long conducting hollow and solid cylinders subjected to a homogeneous nonstationary electromagnetic action. By using the cubic approximation of the axial component of the vector of magnetic-field strength and the radial component of the vector of displacements with respect to the radial coordinate, we obtain the solutions of these...

article

“Trident” Model of Plastic Zone at the End of a Mode I Crack Appearing on the Nonsmooth Interface of Materials

M. V. Dudyk, Yu. V. Dikhtyarenko

Materials Science > 2015 > 50 > 4 > 516-526

By using the Wiener–Hopf method, within the framework of the “trident” model, we compute a small-scale plastic zone formed under conditions of plane deformation at the corner point of the interface of two different elastoplastic materials in the presence of a mode I crack originating from this point. The indicated zone is modeled by two symmetric lateral lines of discontinuities of tangential displacements...

article

Influence of Hydrogen on the Initiation of Creep-Fatigue Cracks in Plates Near Stress Concentrators

O. E. Andreikiv, I. Ya. Dolins’ka, L. N. Dobrovol’s’ka, N. V. Yavors’ka

Materials Science > 2015 > 50 > 4 > 507-515

We formulate a mathematical model for the determination of the effect of hydrogen on the period of initiation of creep-fatigue macrocrack in the vicinity of a stress concentrator in a plate. By using this model, we find the period of initiation of a macrocrack for a strip with two side notches under cyclic loads, high temperatures, and the action of hydrogen-containing medium. It is shown that hydrogen...

article

Specific Features of the Fracture of Hydrogenated High-Nitrogen Manganese Steels Under Conditions of Rolling Friction

O. І. Balyts’kyi, V. O. Kolesnikov, Y. Eliasz, M. R. Havrylyuk

Materials Science > 2015 > 50 > 4 > 604-611

It is shown that, in the course of rolling friction, the intensity of wear of hydrogenated specimens of high-nitrogen manganese steels is five times higher than for nonhydrogenated specimens. As the wear intensity increases, the color of the friction surface of the roller and the sizes of the wear products change. The outward appearance of nonhydrogenated and hydrogenated wear products is noticeably...

article

Fractal Dimension of Grain Boundaries and Mechanical Properties of the Metal of Oxygen Cylinders

V. V. Usov, M. D. Rabkina, N. M. Shkatulyak, T. S. Cherneva

Materials Science > 2015 > 50 > 4 > 612-620

We perform the quantitative fractal analysis of the grain boundaries in the microstructure of Ds steel of five oxygen cylinders with a period of operation from 18 to 52 years. Their fractal dimension is determined by the superposition of square cells of different sizes on the image of the selected grain boundary with computing the number of points of their intersection with this boundary (box method)...

article

Dependence of the Radiation-Protective Efficiency of AL–PB Multilayer Composites on Their Structure

V. A. Bilous, V. M. Borysenko, V. M. Voevodin, S. Yu. Didenko, more

Materials Science > 2015 > 50 > 4 > 600-603

We show that it is reasonable to develop one of the types of new high-performance radiation-protective materials, namely, “light metal + heavy metal” multilayer composites. The characteristics of the internal architecture of Al–Pb composites prepared by the successive application of vacuum and normal atmospheric rolling are presented. The difference between the radioisotropic and accelerated methods...

article

Determination of the Local Strains Near Stress Concentrators by the Digital Image Correlation Technique

Ya. L. Ivanyts’kyi, Yu. V. Mol’kov, P. S. Kun’, T. M. Lenkovs’kyi, more

Materials Science > 2015 > 50 > 4 > 488-495

We analyze the specific features of determination of the local strains in materials in the vicinity of stress concentrators of different radii by the digital image correlation method. The dependences of the critical local strains on the spacing used for their measuring in smooth specimens and specimens with stress concentrators and fatigue cracks are established. Recommendations concerning the choice...

article

Variations of Selected Cyclic Properties Depending on Testing Temperature

M. Kurek, T. Lagoda, K. Walat

Materials Science > 2015 > 50 > 4 > 555-563

Evaluation of fatigue life involves many factors, including temperature in which the structure is working. Based on the literature data, the authors discuss the influence of temperature on the cyclic properties of selected materials. Further analysis proves that, in the case of alloyed steels, temperature affects some quantities characterizing the parameters of fatigue.

article

Development of Plastic Strips in the Process of Shear Deformation of a Body with Narrow Rectangular Slot

V. A. Kryven’, A. R. Boiko, A. V. Kaplun

Materials Science > 2015 > 50 > 4 > 527-535

We obtain analytic solutions of the antiplane problems for a body with semiinfinite rectangular slot in the elastic and elastoplastic (single-strip model of the zone) statements. The load is given in the form of the asymptotics of stresses at infinity equal to the asymptotics of a semiinfinite crack of longitudinal shear expressed via the stress intensity factor. It is established that the development...

article

Three-Dimensional Deformation of a Multilayer Plate with Elastic Links Between its Layers

N. M. Antonenko

Materials Science > 2015 > 50 > 4 > 536-544

We proposed a method for the determination of the stress–strain state of a multilayer plate with elastic links between the layers in the case of its three-dimensional deformation. The solution of the problem is based on the method of compliance functions with application of the two-dimensional Fourier integral transformation. We construct recursive relations for finding the compliance matrices. For...

article

Influence of the Working Media on the Cyclic Crack Resistance of Steels for Elements of Agricultural Machines

R. A. Barna, P. V. Popovych, R. I. Vovk

Materials Science > 2015 > 50 > 4 > 621-625

It is shown that, under the influence of working media, the growth rate of cracklike defects in St. 3 and 20 steels can become about 5–25 times higher as compared with tests in air. In this case, the negative action of the medium on the crack-growth resistance of the indicated steels increases in the following sequence: organic fertilizer (manure) – ammonium sulfate – nitrophoska.

article

Electrodynamic Relations, Energy and Force Factors of the Actions of Electromagnetic Fields for Magnetic Media

O. R. Hachkevych, M. T. Solodyak, R. F. Terlets’kyi, D. V. Tarlakovskii

Materials Science > 2015 > 50 > 4 > 545-554

We study a ferrite layer subjected to the action of electromagnetic fields given by the normal constant and tangential harmonic components of the magnetic field. The conditions required for the formation of small gyromagnetic vibrations in the layer are analyzed. The expressions for the energy and force factors of the field action are obtained.

article

Physicochemical Foundations of Compactification of the Porous Structure of Pyrocarbon from the Gas Phase

V. А. Skachkov, О. R. Berezhnaya

Materials Science > 2015 > 50 > 4 > 585-592

We propose a model of low-temperature compactification of the porous structure of carbonized coal plastic in a flow slab reactor and develop a procedure for the determination of the distribution of pyrocarbon over the thickness of the wall of the compactified coal plastic.

article

Brittle-Fracture Resistance of the Metal of Hyperboloid Gridshell Shukhov Tower

H. V. Krechkovs’ka, О. Z. Student, А. І. Kutnyi, H. М. Nykyforchyn, more

Materials Science > 2015 > 50 > 4 > 578-584

We determine the impact toughness and study the fractographic characteristics of the fracture surfaces of the old and repair steels (produced in 1906 and 1944, respectively) of the hyperboloid gridshell Shukhov water tower in Mykolaiv, some elements of which were replaced after the Second World War. We explain much lower fracture toughnesses of both steels as compared with their contemporary analogs...

article

Erratum to: To the Article “Characterization of the Tribological Behavior of Chromium and Zinc Coatings Electrodeposited on the Steel Substrate,” by S. Rhaiem, F. Nasri, M. Kharrat, and M. Dammak, Vol. 50, No. 1, pp. 135–140, July, 2014

S. Rhaiem, F. Nasri, M. Kharrat, M. Dammak

Materials Science > 2015 > 50 > 4 > 626-626

article

Dependence of the Phase Composition of Nd₁₆Fe_73.9Zr_2.1B₈ Alloy on the Conditions of Milling in Hydrogen

І. І. Bulyk, А. М. Trostyanchyn, V. V. Burkhovets’kyi, І. V. Borukh, more

Materials Science > 2015 > 50 > 4 > 593-599

We reveal the competitive influence of two factors in the process of “dry” milling of Nd₁₆ Fe _73.9 Zr _2.1 B ₈ ferromagnetic alloy in hydrogen. As the rotation frequency of the mill chamber and the duration of the process increase, the range of particle sizes of the powder increases but particles become isotropic as a result of agglomeration. We indicate the possibility of application of a liquid medium...

article

Analysis of the Stiffnesses of Reinforced-Concrete Plane Monolithic Floors with Tubular Inserts

I. V. Mel’nyk

Materials Science > 2015 > 50 > 4 > 564-570

To establish the mean stiffnesses of reinforced-concrete beams with effective tubular inserts in bending, we used the finite-element method and the theory of shells. According to the results of theoretical analysis, it is shown that the cylindrical stiffnesses of reinforced-concrete floors with tubular inserts are different in mutually perpendicular directions. Based on the results of numerical simulations,...

article

Methods for the Evaluation of Fracture and Strength of Pipeline Steels and Structures Under the Action of Working Media. Part 2. Influence of Hydrogen-Containing Media

А. М. Syrotyuk, I. M. Dmytrakh

Materials Science > 2015 > 50 > 4 > 475-487

We generalize contemporary methods used for the evaluation of the strength and fracture hazard of elements of pipeline structures by using the approaches of fracture mechanics of materials with regard for the specific features of the influence of hydrogen-containing media. We develop the methods and determine the characteristic values of hydrogen concentration in the metal depending on the applied...

article

Influence of the Temperature of Redox Cycling on the Structure and Physicomechanical Properties of YSZ–NiO Ceramics

O. P. Ostash, B. D. Vasyliv, V. Ya. Podhurs’ka, O. D. Vasyl’ev, more

Materials Science > 2015 > 50 > 4 > 571-577

The influence of cyclic treatment in reducing and oxidizing gas atmospheres (redox cycling) at temperatures of 600 and 800°C on the structure, strength, and conductivity of YSZ–NiO ceramics for the anode substrates of ceramic fuel cells is investigated. At a temperature of 600°C, we observe the formation of a structure guaranteeing the improved physical and mechanical properties of the material. However,...

article

Signs of Elastooptic Coefficients in Low-Symmetry Materials

B. H. Mytsyk, N. M. Dem’yanyshyn, Ya. P. Kost’

Materials Science > 2015 > 50 > 5 > 762-770

For CaWO₄ calcium-tungstate crystals based of piezooptic π _im and elastic C _mn coefficients, we fill the matrix of elastooptic constants p _in and compute the errors of their determination. We reveal the following empirical regularity: the signs of piezo- and elastooptic coefficients with identical subscripts coincide. It is shown that this law remains true for some other low-symmetry crystals...

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Keywords

CORROSION (7)
STRENGTH (7)
STRESS INTENSITY FACTOR (7)
STEEL (6)
CORROSION RESISTANCE (5)
STRUCTURE (5)
CRACK (4)
DIGITAL IMAGE CORRELATION (4)
HYDROGEN (4)
HYDROGEN CONCENTRATION (4)
STRESS-STRAIN STATE (4)
CORROSION CURRENT (3)
CORROSIVE MEDIA (3)
FATIGUE CRACK (3)
FRACTOGRAPHIC ANALYSIS (3)
MECHANICAL CHARACTERISTICS (3)
MICROHARDNESS (3)
STRESS INTENSITY FACTORS (3)
TEMPERATURE FIELD (3)
WEAR (3)
ACOUSTIC EMISSION (2)
ACTIVATION ENERGY (2)
AGING (2)
ALUMINUM ALLOY (2)
CERAMIC FUEL CELL (2)
COMPOSITE (2)
CONTACT STRESSES (2)
CORROSION-FATIGUE CRACKS (2)
CURVILINEAR CRACK (2)
CYCLIC CRACK RESISTANCE (2)
ELECTRIC CONDUCTIVITY (2)
ELECTRODE POTENTIAL (2)
FATIGUE (2)
FINITE DIFFERENCES (2)
FRACTURE ENERGY (2)
FRACTURE MECHANISM (2)
FRACTURE TOUGHNESS (2)
FRICTION (2)
FRICTION COEFFICIENT (2)
GAS PIPELINE (2)
HARDNESS (2)
HIGH TEMPERATURE (2)
IN-SERVICE DEGRADATION (2)
MAGNETIC MATERIALS (2)
METHOD OF SINGULAR INTEGRAL EQUATIONS (2)
MICROSTRUCTURE (2)
MODELING (2)
NICKEL (2)
PITTING (2)
PLASTICITY (2)
POROUS STRUCTURE (2)
REDOX TREATMENT (2)
REPASSIVATION (2)
RESIDUAL LIFE (2)
RESIDUAL STRESSES (2)
SINGULAR INTEGRAL EQUATIONS (2)
TITANIUM (2)
TITANIUM ALLOY (2)
VT22 TITANIUM ALLOY (2)
0.9 % NACL SOLUTION (1)
8KH18N10Т STEEL (1)
2-PROPANOL EXTRACT (1)
2000 SERIES (1)
316L STAINLESS STEEL (1)
65G STEEL (1)
7075 ALLOY (1)
ABRASIVE WEAR RESISTANCE (1)
ACOUSTOOPTIC MATERIALS (1)
ADHESION (1)
ADHESIVE STRENGTH (1)
AL ALLOYS (1)
ALLOY (1)
ALLOYING (1)
ALUMINUM (1)
ALUMINUM-OXIDE HYDROSOL (1)
AL–PB MULTILAYER COMPOSITES (1)
AMORPHOUS METALLIC ALLOYS (1)
AMORPHOUS PHASE (1)
AMPEROMETRIC SENSOR (1)
ANALYSIS (1)
ANALYTIC SOLUTION (1)
ANISOTROPIC POWDERS (1)
ANODE SUBSTRATE (1)
ANODE-SUBSTRATE (1)
ANOVA (1)
ANTIPLANE DEFORMATION (1)
ASYMMETRIC STRESS TENSOR (1)
ATMOSPHERIC CORROSION (1)
ATOMIC ORDERING (1)
AXIAL AND TANGENTIAL STRESSES (1)
AXLE BEARING (1)
AZ31 MAGNESIUM ALLOY (1)
AZOLIDONES (1)
BASALT FIBER (1)
BEAM (1)
BEARING (1)
BIMETALLIC MATERIALS (1)
BITUMEN-LATEX EMULSION (1)
BORON CEMENTATION (1)
BRITTLE FRACTURE (1)
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Materials Science

Thermal Stressed State of Conducting Cylinders Subjected to the Electromagnetic Action in the Mode with Pulsed Modulating Signals

“Trident” Model of Plastic Zone at the End of a Mode I Crack Appearing on the Nonsmooth Interface of Materials

Influence of Hydrogen on the Initiation of Creep-Fatigue Cracks in Plates Near Stress Concentrators

Specific Features of the Fracture of Hydrogenated High-Nitrogen Manganese Steels Under Conditions of Rolling Friction

Fractal Dimension of Grain Boundaries and Mechanical Properties of the Metal of Oxygen Cylinders

Dependence of the Radiation-Protective Efficiency of AL–PB Multilayer Composites on Their Structure

Determination of the Local Strains Near Stress Concentrators by the Digital Image Correlation Technique

Variations of Selected Cyclic Properties Depending on Testing Temperature

Development of Plastic Strips in the Process of Shear Deformation of a Body with Narrow Rectangular Slot

Three-Dimensional Deformation of a Multilayer Plate with Elastic Links Between its Layers

Influence of the Working Media on the Cyclic Crack Resistance of Steels for Elements of Agricultural Machines

Electrodynamic Relations, Energy and Force Factors of the Actions of Electromagnetic Fields for Magnetic Media

Physicochemical Foundations of Compactification of the Porous Structure of Pyrocarbon from the Gas Phase

Brittle-Fracture Resistance of the Metal of Hyperboloid Gridshell Shukhov Tower

Erratum to: To the Article “Characterization of the Tribological Behavior of Chromium and Zinc Coatings Electrodeposited on the Steel Substrate,” by S. Rhaiem, F. Nasri, M. Kharrat, and M. Dammak, Vol. 50, No. 1, pp. 135–140, July, 2014

Dependence of the Phase Composition of Nd₁₆Fe_73.9Zr_2.1B₈ Alloy on the Conditions of Milling in Hydrogen

Analysis of the Stiffnesses of Reinforced-Concrete Plane Monolithic Floors with Tubular Inserts

Methods for the Evaluation of Fracture and Strength of Pipeline Steels and Structures Under the Action of Working Media. Part 2. Influence of Hydrogen-Containing Media

Influence of the Temperature of Redox Cycling on the Structure and Physicomechanical Properties of YSZ–NiO Ceramics

Signs of Elastooptic Coefficients in Low-Symmetry Materials

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