493 Works

On a configurational force driving surface growth of solids

A.B. Freidin & Y.O. Izmaylova
Surface growth of solids includes a wide variety of processes starting from additive manufacturing technologies and ending with plenty of biological problems. Model of surface growth based on the expression of the configurational force, derived from fundamental laws and entropy inequality, is offered in the present paper. A new expression for the configurational force called surface growth force, which controls growth and resorption, is used. Analysis of the applicability of the developed model was carried...

A numerical study of ballistic behaviour of ceramic metallic bi-layer armor under impact load

M.K. Khan, M.A. Iqbal, V. Bratov, N.K. Gupta & N.F. Morozov
A 3D finite element model has been developed for studying the ballistic behaviour of bi-layer ceramic-metal target plates under the impact loads induced by the projectiles of different diameter to length ratios. The bi-layer target constituted of alumina 95, as front layer, backed by aluminium alloy 2024-T3 layer, has been impacted by steel 4340 blunt and ogival nosed projectiles of diameter to length ratios, 0.5 and 1.1. The constitutive behaviour of ceramic was modelled using...

Nonlinear dynamics of serrated deformation of metals at low temperatures

G.F. Sarafanov & V.N. Perevezentsev
The mode of the serrated deformation is investigated mathematically in framework of the thermoactivation model of unstable plastic deformation in metals at low temperatures. The obtained solutions in the framework of known models, however, do not fully correspond to experimental situation, as the stress oscillations in reality are usually irregular and inhomogeneous. By this reason, additionally, the elastic correlations of neighboring deformation zones were taken into account in the model. Numerical analysis model showed that...

Shear anisotropy in Si-Cu interfaces on the atomic scale

D. Johansson, P. Hansson, A. Ahadi & S. Melin
Three dimensional molecular dynamics (MD) is used to model the mechanical response at the interface between a thin Cu coating resting on a base of Si. The copper coating is subjected to a displacement controlled shear load and the atom movements at the Si-Cu interface are monitored to investigate the effects of crystallographic anisotropy. The two crystals have the same crystallographic orientation, and two different interface normal directions are considered. The shear load is applied...

Dynamics of a frictional system, accounting for hereditary-type friction and the mobility of the vibration limiter

Leonid A. Igumnov, Vladimir S. Metrikin & Mikhail V. Grigoryev
Dynamics of a frictional system consisting of a rough body situated on a rough belt moving at a constant velocity is studied. The vibrations are limited by an elastic obstacle. The Coulomb-Hammonton dry friction characteristic is chosen, according to the hypothesis of Ishlinskiy and Kragelskiy, in the form of hereditary-type friction, where the coefficient of friction of relative rest (CFRR) is a monotone non-decreasing continuous functionof the time of relative rest at the previous analogous...

Flexible polyaniline coated carbon cloth as binder-free electrode material for symmetric supercapacitor application

A.A. Klimont, S.V. Stakhanova, R.R. Galimzyanov, O.V. Uryupina, K.A. Semushin, I.S. Krechetov, M. Kundu & M.V. Astakhov
Nano-structured polyaniline (PANI) containing composite electrodes based on Busofit T-040 carbon cloth (CC) with high specific surface area have been developed for symmetric supercapaitor devices by one-step chemical polymerization of aniline. The capacitive performance of the CC as well as the PANI/CC composites was characterized by the cyclic voltammetry (CV) and the galvanostatic charge-discharge in H2SO4-based aqueous electrolyte. A PANI/CC composite demonstrates significant capacitance enhancement up to 222 F g-1 and 6.7 F cm-2 (vs....

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  • Peter the Great St. Petersburg Polytechnic University
  • Institute of Problems of Mechanical Engineering
  • Ioffe Institute
  • N. I. Lobachevsky State University of Nizhny Novgorod
  • ITMO University
  • St Petersburg University
  • Motilal Nehru National Institute of Technology
  • Indian Institute of Technology Roorkee
  • Russian Academy of Sciences
  • Bauman Moscow State Technical University