scholarly journals DETERMINATION OF DEFORMATION IN MESH COMPOSITE STRUCTURE UNDER THE ACTION OF COMPRESSIVE LOADS

2020 ◽  
Vol 17 (35) ◽  
pp. 599-608 ◽  
Author(s):  
Alexander A. OREKHOV ◽  
Yuri A. UTKIN ◽  
Polina F. PRONINA
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
Bearing Capacity ◽  
Polymer Composite ◽  
Experimental Studies ◽  
Polymer Composite Material ◽  
Lightweight Mesh ◽  
Carbon Filler ◽  
Selection Of

One of the significant innovative technologies is the creation of large-sized structures that work for a long time in space and meet stringent restrictions on overall mass characteristics. Among these structures, in the first place, is the section of bearing truss (BT). This article presents the results of experimental studies of sectors of load-bearing trusses of mesh design for compression. Recently, composite mesh cylindrical shells are used as spacecraft housings. The mesh shell is a supporting structure to which the instruments and mechanisms of the spacecraft are attached. The truss section is made of cross-linked polymer composite material with carbon fibers. The objective of the tests is to confirm the possibility of creating a lightweight mesh construction using a carbon fiber reinforced polymer composite material. To achieve this goal, the authors were assigned the following tasks: selection of carbon filler of polymer composite materials (PCM); selection of PCM binder; determination of the degree of carbon fiber reinforcement; choice of the number and orientation paths of spiral ribs, number of ring ribs and the sizes of individual ribs. As a result of the research, the calculated indicators for ensuring the bearing capacity and stiffness under the application of axial compressive load were obtained. At the same time, with the determination of bearing capacity, the deformation characteristics of the structure were twice determined in order to confirm their repeatability, as well as linear nature of the dependence of axial and radial deformations as a result of the applied load.

scholarly journals Mechanical Properties of GFR & Graphite Epoxy Polymer Composites

2020 ◽  
Vol 5 (6) ◽  
pp. 560-565
Author(s):  
A. Aakash ◽  
S. Selvaraj
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Composite Materials ◽  
Polymer Composite ◽  
Epoxy Polymer ◽  
Significant Degree ◽  
Polymer Composite Material ◽  
Water Ingestion ◽  
Selection Of

Composite materials have the great potential and widely used as building material in numerous applications. Polymer composite material obtains the necessary properties in a controlled significant degree by the selection of strands and lattice. The properties of the materials have been selected by choosing the correct proportion of matrix and reinforcements. To build the quality of the material by expanding the fiber substance of the material. In this current examination, the mechanical properties of the glass fiber and graphite is strengthened with epoxy polymer composite were considered. Here the open embellishment method was received for the manufacture of the polymer composite The mechanical properties, for example, rigidity, compression quality, sway quality and water ingestion test was resolved according to the ASTM norms. The mechanical properties were improved as the filaments support content expanded in the grid material.

DETERMINATION OF THE POLYMERIZATION DEGREE OF THE MATRIX OF POLYMER COMPOSITE MATERIAL USING ULTRASONIC METHOD

2019 ◽  
Vol 85 (4) ◽  
pp. 33-39
Author(s):  
Victor V. Murashov ◽  
Valery M. Aleksashin ◽  
Konstantin S. Mishurov
Keyword(s):  
Composite Material ◽  
Kinetic Parameters ◽  
Polymer Composite ◽  
Ultrasonic Method ◽  
Acoustic Method ◽  
Degree Of Polymerization ◽  
Polymer Composite Material ◽  
Ultrasonic Vibrations ◽  
The Matrix

The results of studying the efficiency of the laser-acoustic method of ultrasonic testing in determination of the degree of polymerization of the matrix of polymer composite material (PCM) are presented. We have studied the PCM samples used for manufacturing integrated structures. It is shown that excessive degree of polymerization of the preformed blanks leads to a decrease in the strength of connection of the structural elements and precludes obtaining the desired shape and geometric dimensions of the product. We developed fundamentally new diagnostic parameters, which are characterized by high reliability and accuracy of determination. To forecast sample curing regimes with given values of the degree of transformation, the reaction kinetics was analyzed using differential scanning calorimetry Experimental results used for calculation of the kinetic parameters were obtained on a thermoanalytical complex DSC 1 (Switzerland). The kinetic parameters of polymerization and degree of binder curing in plastics were determined by the thermal effect of the reaction. It is shown that when determining the degree of polymerization of a PCM matrix by an ultrasonic method (laser-acoustic method of exciting ultrasonic vibrations), the product of attenuation of the bottom signal of longitudinal ultrasonic vibrations by the signal round-trip time and energy of the structural noise (thus taking into account the porosity of the material), can be used as reliable parameters of diagnostics. The proposed method provides higher accuracy compared to other methods used for control of the degree of polymerization.

scholarly journals Prospects for the Use of Secondary Carbon Fibers

2020 ◽  
Vol 6 (3) ◽  
pp. 39-43
Author(s):  
G. Shaidurova ◽  
E. Gatina ◽  
Ya. Shevyakov
Keyword(s):  
Composite Material ◽  
Life Cycle ◽  
High Temperature ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Polymer Composite ◽  
Carbon Fibers ◽  
Polymer Composite Material ◽  
Physicomechanical Characteristics ◽  
Secondary Carbon

The results of studies on the possibility of using secondary carbon fiber extracted from the volume of spent polymer composite material by high-temperature pyrolysis for reinforcing chipboards are reflected. Studies were conducted on the physicomechanical characteristics of reinforced slabs, which showed a significant increase in performance. The results obtained make it possible to assess the possibility of the promising use of secondary fibers, which will provide a solution to the problem of completing the life cycle of polymer composite materials.

scholarly journals MODELING OF A COMPOSITE MATERIAL FOR LASER DIMENSIONAL PROCESSING

2021 ◽  
pp. 46-50
Author(s):  
S. I. Yaresko ◽  
S. N. Balakirov
Keyword(s):  
Finite Element ◽  
Composite Material ◽  
Temperature Field ◽  
Carbon Fiber ◽  
Polymer Composite ◽  
3D Model ◽  
Polymer Composite Material ◽  
Element Calculation ◽  
Cutting Modes ◽  
Dimensional Processing

An algorithm for constructing a geometric 3D model of a part made of a polymer composite material VKU-39 based on carbon fiber, intended for further finite element calculation of the temperature field in the part during laser dimensional processing and the choice of optimal cutting modes, was proposed and realized.

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