493 Works

DETERMINATION OF MECHANICAL PROPERTIES OF GRAPHENE REINFORCED TETRA-GEDVA NANOCOMPOSITE

Debaditya Chakraborty Chakraborty, Ayush Rathi Rathi, Akansha Singh & Ashish Goyal
In the present study, effects of aspect ratio and perforation on the elastic response of graphene nanosheet (GNS)-embedded Tetra GEDVA (triglycidyl ether of divanillyl alcohol) nanocomposite plate are studied by material studio analysis. A dense amorphous cell is created using the Forcite module and simulation is performed. Young's modulus is predicted at varying strain rates from 0-1 GPa. The study conducted coarse-grained molecular dynamics (MD) simulations of Nano-indentation of PMMA (polymethyl methacrylate) polymer to study...

CONTROL OF (AL,GA)P COMPOSITION IN SELF-CATALYZED NANOWIRE GROWTH

Nickolay V. Sibirev, Vladimir Fedorov, Igor V. Shtrom, Alexey D. Bolshakov & Yury Berdnikov
Composition of ternary III-V nanowires became a subject of recent intensive studies inspired by several optoelectronic applications. Among these nanostructures, phosphide nanowires possess a wider bandgap making it especially promising for applications operating in the green visible range. However, unlike other III-V materials, the growth of AlGaP nanowires remains rather unexplored. In this work, we model the stationary composition of self-catalyzed AlGaP grown by molecular beam epitaxy. We show that under a wide range of...

STRUCTURAL BEHAVIOR OF FG-CNT CYLINDRICAL PANEL: INFLUENCE OF NON-UNIFORM TEMPERATURE FIELD

Vinod Bhagat & P. Jeyaraj
In this study, the influence of non-uniform temperature field and temperature-dependent properties on buckling and free vibration behavior of functionally graded carbon nanotube (FG-CNT) reinforced composite cylindrical panel is investigated. For the structural analysis, the finite element method and modal assurance criterion (MAC) analysis are performed. It is found that the temperature-dependent properties and nature of temperature variation fields affect the thermal buckling strength of the panel greatly. The results from MAC analysis reveals that...

STUDY OF RADIAL VIBRATIONS IN THICK WALLED HOLLOW DISSIPATIVE POROELASTIC SPHERICAL SHELL ON ELASTIC FOUNDATION

Rajitha Gurijala & Malla Reddy Perati

Natural isomers of fullerenes from C4 to C20

Alexander I. Melker & Aleksandra N. Matvienko
We have systematized possible ways of forming the isomers of mini-fullerenes, namely elementary fullerenes: tetrahedron C4, triangular prism C6, cube C8, pentagonal prism C10, hexagonal prism C12, as well as their derivatives, which were obtained by joining elementary fullerenes. Combined with the graph analysis, this approach allows obtain a clear knowledge of their structure. Among them there are barrel-shaped fullerenes: C12, C16, C20; tetrahedral ones C12 and C16; bi-shamrocks C14 and C18, bipyramids C14 and...

Morphology investigation of nanoporous anodic alumina films with image analysis

N.V. Lushpa, H.T. Dinh, K.V. Chernyakova & I.A. Vrublevsky
Aluminum films approximately 100 nm thick were deposited on silicon substrates (SiO2 / Si) by thermal evaporation in a vacuum. Porous anodic alumina films were obtained in a potentiostatic mode at 20 V in 0.3 M aqueous solution of oxalic acid and 1.8 M aqueous solution of sulfuric acid. The main pore diameter was determined using the ImageJ software from SEM images. An algorithm determining the pore diameter in porous anodic alumina films was developed....

Influence of LCV bearing stiffness on its static and dynamic characteristics of stability and steerability

Anton V. Tumasov, Sergey Y. Kostin, Danila A. Butin, Aleksey A. Vasiliev & Pavel V. Sereda
Study of the frame stiffness influence on vehicle dynamics and stability of light commercial vehicle is done. The simulations were conducted by using ADAMS/CAR software package. The model approbation was carried by comparing the results of simulation and real tests. The objects of the studies were four different models of a vehicle having different parameters of the frame rigidity. For the needs of the research where conducted such tests as: "going into corner", "line change"...

Mechanical impulse enhancement in a microsystem based on nanoporous silicon combustion

S.K. Lazarouk, A.V. Dolbik & V.A. Labunov
Nanostructured porous silicon impregnated by solid state oxidizer has been studied in order to provide the mechanical impulse for jet-propulsion microsystems. The system with jet-propulsion motion on a silicon chip has been tested for impulse measurements. The silicon chip has been fastened on a carrying platform through an elastic spacer. The elastic spacer promotes the combustion and prevents from explosion of porous silicon fast oxidation. It is shown that such a microsystem gains the impulse...

Numerical simulation of hypervelocity impacts of variously shaped projectiles with thin bumpers

M.V. Silnikov, I.V. Guk, A.I. Mikhaylin, A.F. Nechunaev & B.V. Rumyantsev
The paper presents a numerical simulation of hypervelocity impacts of variously shaped projectiles with thin bumpers. A numerical model was verified using a full-scale experiment of hypervelocity impact of a sphere with thin aluminum-alloy bumper. Hypervelocity impacts of nonspherical projectiles of different spatial orientation with thin bumpers were also numerically investigated. The investigations show that a hypervelocity impact of a nonspherical projectile advancing with its sharp edge towards the bumper results in a denser debris...

Applied theory of bending vibrations of a piezoelectric bimorph with a quadratic electric potential distribution

A.N. Soloviev, V.A. Chebanenko, I.A. Parinov & P.A. Oganesyan
An applied theory of cylindrical bending vibrations of a bimorph plate is developed, which takes into account the nonlinear distribution of the electric potential in piezoelectric layers. Finite-element analysis of this problem showed that such distribution arises when solving the problems of finding the resonant frequencies and modes of vibration or in the case of forced oscillations during their mechanical excitation, when the electric potentials on the electrodes are zero. The quadratic distribution of the...

NUCLEATION OF ISLANDS WITH VERTICAL OR TRUNCATED CORNER FACETS IN VAPOR-LIQUID-SOLID NANOWIRES

V.G. Dubrovskii, Zh.V. Sokolova, M.V. Rylkova & A.A. Zhiglinsky
We develop a model for nucleation of islands in vapor-liquid-solid nanowires with either vertical or truncated corner facets. Under the assumption of two-dimensional geometry of the growing island, it is shown that the earlier energetic condition for the truncated edge at the growth interface is modified by chemical potential. Therefore, the islands may nucleate at the trijunction during growth even if the truncation is preferred at the no growth conditions on surface energetic grounds. This...

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