Volume
8 № 4 2016
Композиты и наноструктуры COMPOSITES
and NANOSTRUCTURES
S.T.Mileiko, A.A.Kolchin,
V.A.Chumichev, N.I.Novokhatskaya,
N.A.Prokopenko, O.F.Shakhlevich
MULLITE-ZRO2-FIBRE/MO-MATRIX COMPOSITES: FABRICATION,
MICROSTRUCTURE AND MECHANICAL
PROPERTIES......................................................................................................................................211
Composite with mullite-ZrO2 fibres
and molybdenum matrix are obtained for the first time; their macro- and
micro-structures, room and high temperature strength as well as damage
tolerance are studied.
Some special features of the fibre microstructures are revealed. It is shown that
composites with fibres of some mullite-ZrO2
compositions are sufficiently strong at temperatures up to 1400oC.
All composites are characterized by high damage tolerance (p. 211-223; fig.
11).
Yu. R. Kolobov,
M. V. Zhidkov, A. E. Ligachev,
S. I. Kudryashov, S. V. Makarov, A. A. Ionin
THE INFLUENCE OF LASER RADIATION OF FEMTOSECOND DURATION ON THE
STRUCTURE AND PROPERTIES OF SURFACE LAYERS OF STEEL
12Kh18N10T.................................................................................223
A comparative experimental study of the influence of femtosecond laser
irradiation with various surface energy densities and the number of pulses on a
change in the surface topography of steel 12Kh18N10T (AISI 321) was carried out
using scanning electron and atomic force microscopy.
Depending on the laser parameters
various types of surface nano - and
microstructures were produced. It is revealed that due to the formation of
multi-level topography on the surface of steel 12KH18N10T is possible to
obtain superhydrophobic state (и~180°) (p. 223-235;
fig. 7).
V.S. Zarubin, G.N. Kuvyrkin, I.Y. Savelyeva
ESTIMATES OF EFFECTIVE THERMAL CONDUCTIVITY OF THE COMPOSITE WITH
ANISOTROPIC TAPE FORM INCLUSIONS.................................................................................................................................................236
On the basis of mathematical model of heattransfer
in a non-uniform solid body with anisotropic ellipsoidal inclusions the
procedure of assessment of effective thermal conductivity tensor components for
a composite with the anisotropic tape inclusions modeling a form of
fragments of a decanter is constructed. Cases of the ordered and chaotic
arrangement of inclusions in an isotropic matrix of a composite are considered.
With application of the dual variation formulation of a problem of
stationary heat conductivity in a non-uniform anisotropic solid body the
bilateral estimates allowing to establish the greatest possible error when
using in quality a component of a tensor of effective heat conductivity of the
considered composite of half-sums of the corresponding estimates are
received. Owing to electrothermal analogy the
presented estimates are applicable by consideration of characteristics of
conductivity and dielectric permeability of composites with inclusions of
a tape form (p. 236-250; fig. 4).
A.V. Kepman, I.V. Makarenko, V.L. Strakhov
EXPERIMENTAL STUDY OF POLYMER COMPOSITE MATERIALS THERMOCHEMICAL AND
THERMOPHYSICAL PROPERTIES AND THEIR CURING PROCESS KINETICS .....................................................251
The EHD-MD and EDT -10 epoxy resins characteristics were experimentally
measured: the enthalpy of curing, thermal conductivity, heat capacity, density,
heat release rate for the different heating rates, mass loss rate. The
measurements were performed with NETZSCH equipment. Kinetic models and
kinetic parameters ofthe resins curing processes were
obtained via NETZSCH Thermokinetics 3.0 software
based on by differential scanning calorimetry data.
The obtained experimental data and the kinetic models can be used
for three-dimensional simulations of composite materials parts production
in order to optimize the technological process and to improve the quality ofthe final products (p. 251-264; fig. 7).
Strizhius V.Y.
SOME LAWS OF FATIGUE STRENGTH OF AIRFRAME COMPOSITE
ELEMENTS........................................................265
A review and analysis of existing fatigue fracture models of the layered
polymer composite elements, working in conditions of uniaxial
tension-compression, are conducted. According to the analysis determining S-N
fatigue curve equation and constant life diagram of these elements are
generated. A special non-linear fatigue damage summation rule, which allows to carry out fatigue durability calculations of these
elements under random loading, typical for longitudinal elements of transport
aircraft wing, is offered (p. 265-271; fig. 3).
© ИФТТ РАН «Композиты и наноструктуры». 2016