4,213 research outputs found
Nonlinear Deformation of Structure Elementsfrom Different Materials under Impulse and Shock Loads
simulation of high-rate deformation processes, three-dimensional models are used. The following determined
relationships are taken into account: elastic-plastic deformation (according to the theory of dynamic plastic
deformation); the dynamic properties of the materials, which change during deformation; the finite
displacements and deformations.
The problem is solved by the finite elements method. The paper analyzes the impact of pulse and shock loads
performed on the elements of various constructions made of different materials. Comparison of the research
results shows that the elements from the improved composite material possess both the required strength and
lowest weight. Furthermore, the experimental and numerical results are compared as an example of the
influence of the impulse load on the composite material plate with a cut.
The paper shows the features of the distribution and localization of the stress intensity and displacements at the
impulse and impact loading in the multi-layered structural elements. The deformation processes occur in
different stages up to the elastic-plastic finite deformations depending on the speed of the projectile.
The results of these studies were used in the analysis of the dynamic strength of real structural elements
Oxidative detoxification of organomercury pesticides
A method of oxidative mineralization of the organomercury granozan pesticide commercial form under mild conditions was investigated. The product components of hazard class 1 were destructed to the low-toxic compounds in the electrolyte under the oxidants electrochemically formed in situ in sulphuric acid solutions of pesticide. Simultaneously, at the cathode, the mercury ions formed as a result of the pesticide organic component destruction process reduce up to more than 90%
Technological features of manufacturing an arched gears
Π ΠΎΠ·Π³Π»ΡΠ½ΡΡΠΎ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΡΡΠ½Ρ ΠΎΡΠΎΠ±Π»ΠΈΠ²ΠΎΡΡΡ Π²ΠΈΠ³ΠΎΡΠΎΠ²Π»Π΅Π½Π½Ρ ΡΠ° ΡΠΌΠΎΠ²ΠΈ ΠΎΠ±ΡΠΎΠ±ΠΊΠΈ Π·Π°Π³Π°ΡΡΠΎΠ²Π°Π½ΠΈΡ
Π°ΡΠΊΠΎΠ²ΠΈΡ
ΡΠΈΠ»ΡΠ½Π΄ΡΠΈΡΠ½ΠΈΡ
Π·ΡΠ±ΡΠ°ΡΡΠΈΡ
ΠΏΠ΅ΡΠ΅Π΄Π°Ρ Ρ Π°ΡΠΎΡΠ½ΠΈΡ
ΠΊΠΎΠ½ΡΡΠ½ΠΈΡ
ΠΏΠ΅ΡΠ΅Π΄Π°Ρ Π· Π·Π°ΡΠ΅ΠΏΠ»Π΅Π½Π½ΡΠΌ Π. Π. ΠΠΎΠ²ΡΠΊΠΎΠ²Π°. Π ΠΎΠ·ΡΠΎΠ±Π»Π΅Π½Π° ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠ° Π²ΠΈΠ±ΠΎΡΡ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΎΡΡΡΠΊΠΎ-ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΡΡΠ½ΠΈΡ
Π²ΠΈΠΌΠΎΠ³ Π°ΡΠΊΠΎΠ²ΠΈΡ
ΠΏΠ΅ΡΠ΅Π΄Π°Ρ Ρ ΡΠΈΡΡΠ΅ΠΌΠ° βΠ ΠΠ‘-1β Π³Π΅ΠΎΠΌΠ΅ΡΡΠΈΡΠ½ΠΎΠ³ΠΎ ΡΠΎΠ·ΡΠ°Ρ
ΡΠ½ΠΊΡ ΡΠΈΠ»ΡΠ½Π΄ΡΠΈΡΠ½ΠΈΡ
, ΠΊΠΎΠ½ΡΡΠ½ΠΈΡ
Ρ ΡΠ΅ΠΉΠΊΠΎΠ²ΠΈΡ
ΠΏΠ΅ΡΠ΅Π΄Π°Ρ Π· Π°ΡΠΊΠΎΠ²ΠΈΠΌΠΈ Π·ΡΠ±ΡΡΠΌΠΈ, Π° ΡΠ°ΠΊΠΎΠΆ ΡΠ½ΡΡΡΠΊΠ°ΡΡΡ Ρ ΡΠΊΠΎΡΠΎΡΠ΅Π½Π½Ρ Π½ΠΎΠΌΠ΅Π½ΠΊΠ»Π°ΡΡΡΠΈ Π·Π°ΡΠΎΠ±ΡΠ² Π²ΠΈΡΠΎΠ±Π½ΠΈΡΡΠ²Π°. ΠΡΠΎΠ²Π΅Π΄Π΅Π½Ρ ΡΡΠ΅Π½Π΄ΠΎΠ²Ρ Π²ΠΈΠΏΡΠΎΠ±ΡΠ²Π°Π½Π½Ρ Π°ΡΠΎΡΠ½ΠΈΡ
Π·ΡΠ±ΡΠ°ΡΡΠΈΡ
ΠΏΠ΅ΡΠ΅Π΄Π°Ρ Π΄ΠΎΠ·Π²ΠΎΠ»ΠΈΠ»ΠΈ ΡΡΠ²ΠΎΡΠΈΡΠΈ ΡΠ½ΡΠ²Π΅ΡΡΠ°Π»ΡΠ½ΠΈΠΉ ΡΡΠΆΡΡΠΈΠΉ ΡΠ½ΡΡΡΡΠΌΠ΅Π½Ρ Π· ΠΊΡΡΠ³Π»ΠΈΠΌΠΈ Π½Π΅Π·Π°ΡΡΠ»ΠΎΠ²Π°Π½Π½ΡΠΌΠΈ ΡΡΠ·ΡΡΠΌΠΈ.Purpose. Technological peculiarities of production and conditions of hardened cylindrical arched gears and arched bevel gears with meshing M. L. Novikova. Design/methodology/approach. Developed methodology for selection of design and technological requirements of the arched guide and the system "IR-1" geometric calculation of cylindrical, bevel and pinion gear with arched teeth, as well as unification and reduction of the range of the means of production. Bench tests of the arched gear has allowed us to create a versatile cutting tool with a round niesatynowany cutters. Conical spur, helical and herringbone gear, along with the advantages are inherent operational and technological disadvantages and in some cases do not satisfy the increasing requirements of modern gears to ensure smoothness, durability, reliability. The purpose of the design and process conditions for manufacturing an arched gears. Study of the technological features of manufacturing arched teeth at the present time is a real reserve for further enhancing the efficiency of gears and means for their production. Findings. Arched teeth allow to increase the load capacity of 1.25-1.5 times and durability in 2 - 3 times a cylindrical and a rack and pinion transmission, to reduce vibration, noise characteristics, intensity and cost. Originality/value. Arched teeth allow you to create a single technological system tools for the production of cylindrical, bevel and pinion gears provide smooth transmission of motion and can find application in high-speed high-load transmission.Π Π°ΡΡΠΌΠΎΡΡΠ΅Π½Ρ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠΈ ΠΈΠ·Π³ΠΎΡΠΎΠ²Π»Π΅Π½ΠΈΡ ΠΈ ΡΡΠ»ΠΎΠ²ΠΈΡ ΠΎΠ±ΡΠ°Π±ΠΎΡΠΊΠΈ Π·Π°ΠΊΠ°Π»Π΅Π½Π½ΡΡ
ΡΠΈΠ»ΠΈΠ½Π΄ΡΠΈΡΠ΅ΡΠΊΠΈΡ
Π°ΡΠΎΡΠ½ΡΡ
Π·ΡΠ±ΡΠ°ΡΡΡ
ΠΏΠ΅ΡΠ΅Π΄Π°Ρ ΠΈ Π°ΡΠΎΡΠ½ΡΡ
ΠΊΠΎΠ½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΏΠ΅ΡΠ΅Π΄Π°Ρ Ρ Π·Π°ΡΠ΅ΠΏΠ»Π΅Π½ΠΈΠ΅ΠΌ Π.Π. ΠΠΎΠ²ΠΈΠΊΠΎΠ²Π°. Π Π°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π° ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠ° ΠΏΠΎ Π²ΡΠ±ΠΎΡΡ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΎΡΡΠΊΠΎ-ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΡΠ΅Π±ΠΎΠ²Π°Π½ΠΈΠΉ Π°ΡΠΎΡΠ½ΡΡ
ΠΏΠ΅ΡΠ΅Π΄Π°Ρ ΠΈ ΡΠΈΡΡΠ΅ΠΌΠ° βΠ ΠΠ‘-1β Π³Π΅ΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΠ°ΡΡΠ΅ΡΠ° ΡΠΈΠ»ΠΈΠ½Π΄ΡΠΈΡΠ΅ΡΠΊΠΈΡ
, ΠΊΠΎΠ½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈ ΡΠ΅Π΅ΡΠ½ΡΡ
ΠΏΠ΅ΡΠ΅Π΄Π°Ρ Ρ Π°ΡΠΎΡΠ½ΡΠΌΠΈ Π·ΡΠ±ΡΡΠΌΠΈ, Π° ΡΠ°ΠΊΠΆΠ΅ ΡΠ½ΠΈΡΠΈΠΊΠ°ΡΠΈΡ ΠΈ ΡΠΎΠΊΡΠ°ΡΠ΅Π½ΠΈΠ΅ Π½ΠΎΠΌΠ΅Π½ΠΊΠ»Π°ΡΡΡΡ ΡΡΠ΅Π΄ΡΡΠ² ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π°. ΠΡΠΎΠ²Π΅Π΄Π΅Π½Π½ΡΠ΅ ΡΡΠ΅Π½Π΄ΠΎΠ²ΡΠ΅ ΠΈΡΠΏΡΡΠ°Π½ΠΈΡ Π°ΡΠΎΡΠ½ΡΡ
Π·ΡΠ±ΡΠ°ΡΡΡ
ΠΏΠ΅ΡΠ΅Π΄Π°Ρ ΠΏΠΎΠ·Π²ΠΎΠ»ΠΈΠ»ΠΈ ΡΠΎΠ·Π΄Π°ΡΡ ΡΠ½ΠΈΠ²Π΅ΡΡΠ°Π»ΡΠ½ΡΠΉ ΡΠ΅ΠΆΡΡΠΈΠΉ ΠΈΠ½ΡΡΡΡΠΌΠ΅Π½Ρ Ρ ΠΊΡΡΠ³Π»ΡΠΌΠΈ Π½Π΅Π·Π°ΡΡΠ»ΠΎΠ²Π°Π½Π½ΡΠΌΠΈ ΡΠ΅Π·ΡΠ°ΠΌΠΈ
Development Liquid Rocket Engine of Small Thrust With Combustion Chamber from Carbon - Ceramic Composite Material
Properties of Neutral Charmed Mesons in Proton--Nucleus Interactions at 70 GeV
The results of treatment of data obtained in the SERP-E-184experiment
"Investigation of mechanisms of the production of charmed particles in
proton-nucleus interactions at 70 GeV and their decays" by irradiating the
active target of the SVD-2 facility consisting of carbon, silicon, and lead
plates, are presented. After separating a signal from the two-particle decay of
neutral charmed mesons and estimating the cross section for charm production at
a threshold energy {\sigma}(c\v{c})=7.1 \pm 2.4(stat.) \pm 1.4(syst.)
\mub/nucleon, some properties of D mesons are investigated. These include the
dependence of the cross section on the target mass number (its A dependence);
the behavior of the differential cross sections d{\sigma}/dpt2 and
d{\sigma}/dxF; and the dependence of the parameter {\alpha} on the kinematical
variables xF, pt2, and plab. The experimental results in question are compared
with predictions obtained on the basis of the FRITIOF7.02 code.Comment: 9 pages, 9 figures,3 table
Role of gallium diffusion in the formation of a magnetically dead layer at the Y3Fe5O12/Gd3Ga5O12 epitaxial interface
We have clarified the origin of a magnetically dead interface layer formed in yttrium iron garnet (YIG) films grown at above 700 degrees C onto a gadolinium gallium garnet (GGG) substrate by means of laser molecular beam epitaxy. The diffusion-assisted formation of a Ga-rich region at the YIG/GGG interface is demonstrated by means of composition depth profiling performed by x-ray photoelectron spectroscopy, secondary ion mass spectroscopy, and x-ray and neutron reflectometry. Our finding is in sharp contrast to the earlier expressed assumption that Gd acts as a migrant element in the YIG/GGG system. We further correlate the presence of a Ga-rich transition layer with considerable quenching of ferromagnetic resonance and spin wave propagation in thin YIG films. Finally, we clarify the origin of the enigmatic low-density overlayer that is often observed in neutron and x-ray reflectometry studies of the YIG/GGG epitaxial system
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