493 Works

Multiscale simulations of novel additive manufactured continuous fiber-reinforced three-component composite material

A.U. Zobacheva, A.S. Nemov & A.I. Borovkov
The paper is dedicated to simulation of novel three-component composite material obtained by layer-by-layer 3D printing mechanical behavior on the basis of detailed reproduction of its microstructure. Results of numerical study of the microstructure parameters influence on the mechanical characteristics of the composite material produced by 3D printing are presented and discussed.

СТРУКТУРА И МИКРОТВЕРДОСТЬ ДВУХСЛОЙНЫХ КОМПОЗИТНЫХ ФОЛЬГ ИЗ НАНОДВОЙНИКОВАННОЙ МЕДИ С НАНОВКЛЮЧЕНИЯМИ ГРАФЕНА

О.Ю. Курапова, В.Г. Конаков, А.С. Гращенко, Н.Н. Новик, С. Н. Голубев, А.В. Орлов & И.А. Овидько
В работе двухслойные композитные медные фольги были получены электрохимическим осаждением на постоянном токе из суспензий графит-графеновой смеси, стабилизированных неионными поверхностно-активными веществами ПАВ (Pluronic F-127, полиакриловая кислота - ПАК). Методом сканирующей электронной микроскопии изучена микроструктура внешней стороны фольг, а с помощью атомно-силовой микроскопии - микроструктура их обратной стороны. Методом рентгенофазового анализа доказано, что в случае фольг, полученных из суспензий, содержащих Pluronic F-127, осаждение тонкого слоя медной подложки приводит к росту двойникованных кристаллов меди. С помощью Рамановской...

Evolution of the droplet shape in the vapor-liquid-solid growth of III-V nanowires under varying material fluxes

V.G. Dubrovskii & A.S. Sokolovskii
We present a model for the time evolution of the shape of a droplet catalyzing the vapor-liquid-solid growth of III-V semiconductor nanowires under varying group III or group V fluxes. Under the assumption of a constant radius of the nanowire top, the model gives the time dependence of the droplet contact angle. These results can be used for the fine tuning of the droplet shape, which affects the preferred crystal phase (zincblende or wurtzite) of...

Modeling microstructure evolution during thermomechanical processing and heat treatment of steels and predicting their mechanical properties

A.A. Vasilyev, D.F. Sokolov & S.F. Sokolov
An integral computer model/program AusEvol Pro was developed to describe the evolution of steel microstructure during thermomechanical processing (hot rolling, forging), as well as subsequent heat treatment (normalization, tempering), and to evaluate the final mechanical properties (yield stress, tensile stress, elongation), hardness and impact toughness. The program implements a set of physically based models that allow quantitative description of all significant processes of steel structure formation with account of the effects of chemical composition both...

Nano- and microparticle aggregation: unique optical vectors for control

Alexandra G. Bezrukova & Olga L. Vlasova
The multiparameter analysis of simultaneous optical data for systems of nano- and/or micro-particles (3D disperse systems, dispersions, colloids, ensembles with the average diameter less than 10 micrometers) can be presented as the system characteristics characterized by N-dimensional unique vectors of optical parameters that can elucidate changes in the state of system particles. The application of ND unique optical vector approach is shown for several biomedical dispersions at the processes of aggregation. This approach can serve...

Element-free numerical modeling with discrete gradient and its application to crystal defects

A.A. Zisman
The gradient operation has been extended to discrete data in terms of nodal coordinates. On this ground, the nodal strains and related stresses are expressed directly in terms of nodal displacements and the stress divergence in terms of nodal stresses. To make use of truly discrete modeling in computational solid mechanics, the stress balance equation is formulated. For a case study, the latter is applied to an edge dislocation where atom positions of a dislocated...

Experimental study and modeling of changing mechanical properties in tempering of bainitic-martensitic steels

A.A. Vasilyev , D.F. Sokolov & S.F. Sokolov
Dependences of mechanical properties (yield stress, tensile stress, relative elongation) and impact toughness on the tempering time at various temperatures have been investigated for 10 industrial bainitic-martensitic steels with a wide range of chemical compositions (C(0.04-0.27), Mn(0.33-1.57), Si(0.22-1.09), Cr(0.02-1.14), Ni(0.01-3.74), Cu(0.02-1.03), Mo(0.01-0.43), Nb(0.002-0.044), V(0.003-0.200), Ti(0.001-0.045), B(≤0.003) (mass.%)). Based on the obtained experimental results, a quantitative model is developed to predict the mechanical properties of the considered steels after tempering. The modeling results comply well with...

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