Features of testing composition materials on shear at high temperatures

2020 ◽  
pp. 180-186
Author(s):  
К.В. Шаньгин
Keyword(s):  
High Temperatures ◽  
Shear Test ◽  
Measurement Accuracy ◽  
Physical And Mechanical Properties ◽  
Carbon Composite ◽  
Space Technology ◽  
Composition Materials ◽  
Carbon Composite Materials ◽  
Properties Of Materials ◽  
Materials Used

Рассмотрены проблемы, возникающие при испытании на сдвиг при высоких температурах, объемно - армированных углерод - углеродных композиционных материалов, применяемых при создании ракетно-космической техники. Предложены варианты повышения точности измерения, достоверности определяемых физико-механических свойств материалов. Problems arising during shear test at high temperatures of volume - reinforced carbon - carbon composite materials used in creation of rocket and space technology are considered. Disclosed are versions of improving measurement accuracy and reliability of determined physical and mechanical properties of materials.

INFLUENCE OF THE PYROLYTIC COMPACTION PROCESS ON THE PHYSICAL AND MECHANICAL PROPERTIES OF HIGH-DENSITY CARBON-CARBON COMPOSITE MATERIALS BASED ON PITCH MATRICES

2021 ◽  
pp. 3-9
Author(s):  
V. V. Kulakov ◽  
M. I. Pankov ◽  
V. A. Sivurova ◽  
M. S. Luchkin ◽  
A. K. Golubkov ◽  
...  
Keyword(s):  
Carbon Fibers ◽  
Initial Density ◽  
Physical And Mechanical Properties ◽  
Pyrolytic Carbon ◽  
Carbon Composite ◽  
Test Results ◽  
High Modulus ◽  
Compaction Process ◽  
Carbon Composite Materials ◽  
Density Values

The efficiency of the pyrolytic carbon compaction process by decomposing methane in samples of a carbon-carbon composite randomly reinforced with discrete high-modulus (graphitized) carbon fibers with different densities is investigated. The analysis of the test results of samples for determining the compressive strength, determining the densities of samples after compaction with pyrocarbon and after compaction by impregnation and carbonization under pressure is carried out. Scanning electron microscopy (SEM) was used to study the structure of material samples with different initial density values.

Bearing capacity of a threaded pair made of spatially reinforced carbon-carbon composite materials at high temperatures

2021 ◽  
pp. 30-34
Author(s):  
Keyword(s):  
Composite Materials ◽  
Bearing Capacity ◽  
High Temperatures ◽  
Limit Load ◽  
Carbon Composite ◽  
Reinforcement Scheme ◽  
Carbon Composite Material ◽  
Carbon Composite Materials ◽  
Threaded Joints ◽  
Joint Limit

The bearing capacity of a threaded pair made of spatially reinforced carbon-carbon composite materials (CCCM) with a 4DL reinforcement scheme in the temperature range from 20 to 2500 °C is experimentally determined. Recommendations are given for the design of CCCM threaded joints for operation at high temperatures. Keywords: carbon-carbon composite material, threaded joint, limit load, bearing capacity, threaded pair, high temperature. [email protected]

scholarly journals О влиянии анизотропной проводимости углекомпозитных материалов на параметры рупорной антенны C-диапазона

2021 ◽  
Vol 91 (4) ◽  
pp. 664
Author(s):  
Н.А. Дугин ◽  
Т.М. Заборонкова ◽  
Г.Р. Беляев ◽  
Е.Н. Мясников
Keyword(s):  
Composite Materials ◽  
High Frequency ◽  
Carbon Composite ◽  
Microwave Devices ◽  
Horn Antennas ◽  
Anisotropic Conductivity ◽  
Binding Substance ◽  
Carbon Composite Materials ◽  
Polarization Characteristics ◽  
Materials Used

The influence of anisotropic conductivity of composite materials used in the manufacture of antennas on the parameters of antenna-feeder microwave devices has been considered. To test experimentally the possibility of such an effect, horn antennas of the L– and C– frequency bands were created from carbon-composite materials of various structures with a graphene-containing epoxy-binding substance. The study of the polarization characteristics of these antennas showed that the presence of anisotropic conductivity of the walls of the waveguide part of horn antennas made of composite materials leads to a change in the parameters of the antennas, which is more noticeable for high –frequency C-band antennas.

scholarly journals ЭКСПЕРИМЕНТАЛЬНЫЕ ИССЛЕДОВАНИЯ СВОЙСТВ УГЛЕРОДНЫХ КОМПОЗИЦИОННЫХ МАТЕРИАЛОВ НА ТРУБЧАТЫХ МОДЕЛЯХ

2018 ◽  
Vol 26 (4) ◽  
pp. 59-63
Author(s):  
Т. А. Манько ◽  
И. А. Гусарова ◽  
О. П. Роменская ◽  
А. А. Самусенко ◽  
И. И. Деревянко
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Acrylic Acid ◽  
Plasma Treatment ◽  
Carbon Fibers ◽  
Carbon Composite ◽  
Atmospheric Plasma ◽  
Space Technology ◽  
Carbon Composite Materials ◽  
Acid Environment

At present, carbon composite materials are widely used in space technology. The tendency to expand the consumption of carbon fiber in the manufacture of parts and structures requires the study of new ways of obtaining it. A method of modifying carbon fibers by atmospheric plasma treatment in two different media was used: acrylic acid and allylamine, and fillers were studied on tubular models. As a result of the tests, it was found that atmospheric plasma treatment in acrylic acid environment, contributes to the improvement of the characteristics of CFRP by ~ 25 % more efficiently than processing in allylamine for the types of fillers studied.

FORMATION OF PHYSICAL AND MECHANICAL CHARACTERISTICS OF CARBON-CARBON MATERIALS IN ISO-STATIC TECHNOLOGY FOR PRODUCING CARBON MATRIX

1970 ◽  
Vol 61 (11) ◽  
Author(s):  
Sergey A. Kolesnikov ◽  
Darya S. Maximova
Keyword(s):  
Physical And Mechanical Properties ◽  
Carbon Matrix ◽  
Carbon Composite ◽  
Subsequent Stage ◽  
Density Level ◽  
Porosity Level ◽  
Deformation Curves ◽  
High Pressure High Temperature ◽  
Carbon Composite Materials ◽  
Physical Reasons

At certain stages of the "High Pressure-High Temperature" technology of obtaining carbon matrixes, studies were conducted to determine the level of properties of carbon-carbon structural materials during stretching, compression, and bending. The values of the modulus of elasticity were calculated from the deformation curves. The advantages of this technology are shown in the paper: constant porosity preservation in an open form, accessible for the subsequent stage of impregnation of the precursor of the carbon matrix. As a result, technically, the most efficient filling of all levels of the pore structure of carbon fibers and multidimensional structures with sizes ranging from fractions to thousands of microns is achieved. Dependences of the change in physical and mechanical properties on the porosity of the carbon matrix qualitatively changed for the three states of the composite: highly porous (lack of monolithic material); dense material (100% realization of the elastic modulus of the reinforcement); high-density material (~ 100% realization of reinforcement strength). It is shown that the strength of the composite corresponds to the notion of a "bound" and "unbound" fiber bundle according to Weibull. According to these models, the tensile strength of the carbon-carbon composite material was calculated and the results were obtained in good agreement with the experimental ones. It is established that the porosity level of ~ 0.14 and the corresponding density level of ~ 1.8 g / cm3 is the boundary for the formation of carbon-carbon composite materials with this type of carbon matrix, with the qualities of the structural material. With the provision of hydrostatic pressure in the carbonization process, there are no physical reasons for the separation of the technological scheme into "preliminary" and "finish" processes with a different set of equipment.  

Metallurgical Effects of Grain Boundary Ledges

1977 ◽  
Vol 35 ◽  
pp. 126-129
Author(s):  
L.E. Murr
Keyword(s):  
Grain Boundary ◽  
Quantitative Data ◽  
Mechanical Treatment ◽  
Unit Length ◽  
Physical And Mechanical Properties ◽  
Direct Observations ◽  
Transmission Electron ◽  
Properties Of Materials ◽  
Thermo Mechanical Treatment ◽  
Ledge Density

Ledges in grain boundaries can be identified by their characteristic contrast features (straight, black-white lines) distinct from those of lattice dislocations, for example1,2 [see Fig. 1(a) and (b)]. Simple contrast rules as pointed out by Murr and Venkatesh2, can be established so that ledges may be recognized with come confidence, and the number of ledges per unit length of grain boundary (referred to as the ledge density, m) measured by direct observations in the transmission electron microscope. Such measurements can then give rise to quantitative data which can be used to provide evidence for the influence of ledges on the physical and mechanical properties of materials.It has been shown that ledge density can be systematically altered in some metals by thermo-mechanical treatment3,4.

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