scholarly journals PHYSICO-MECHANICAL, THERMAL AND ELECTRICAL CHARACTERISTICS COMPOSITE MATERIALS BASED ON POLYURETHANE BINDER AND MINERAL FILLERS

2020 ◽  
pp. 14-21
Author(s):  
V. Sh. Sulaberidze ◽  
E. A. Skorniakova
Keyword(s):  
Composite Materials ◽  
Flame Retardants ◽  
Mechanical Characteristics ◽  
Elasticity Modulus ◽  
Electrical Characteristics ◽  
Dielectric Coatings ◽  
Fine Powders ◽  
Coefficient Of Elasticity ◽  
Mineral Fillers ◽  
Physical And Mechanical Characteristics

The article presents the results of studies of the physical, mechanical, thermal and electrical characteristics of composite materials based on polyurethane as a binder and mineral fillers from fine powders AlN, Al(OH)3, SiO2, CaSiO3 with a content of up to 70 wt.%. These composite materials are used to create modern sealants and dielectric coatings that meet special requirements for strength, elasticity, heat resistance, including those that do not support combustion (by using flame retardants). Dependences of tensile strength, coefficient of elasticity, modulus of elasticity under compression and hardness of samples, electrical resistivity and thermal conductivity on the mass content of the filler were determined. It was found that in terms of the combination of physical and mechanical characteristics, the compositions based on the applied polyurethane are more durable, elastic and resilient than compositions based on a silicone binder with the same fillers previously studied by the authors.

Refractory Core-Shell Powders for Additive Industries

2017 ◽  
Vol 265 ◽  
pp. 529-534 ◽  
Author(s):  
Sergey P. Bogdanov ◽  
A.P. Garshin
Keyword(s):  
Thin Films ◽  
Silicon Carbide ◽  
Composite Materials ◽  
Boron Nitride ◽  
Tungsten Carbide ◽  
Mechanical Characteristics ◽  
Core Shell ◽  
Refractory Materials ◽  
Iodide Transport ◽  
Physical And Mechanical Characteristics

The finished products obtained when the surfaces of powders of refractory materials (diamond, boron nitride, silicon carbide, tungsten carbide, tungsten) were coated with thin films by the method of iodide transport are presented. The developed method enables to obtain powder composite materials of core-shell type that have surface thickness varying in the range from 1 nm to several micrometers. From the powders modified by the films of metals and thier compounds composite materials were developed, their physical and mechanical characteristics were studied. The characteristics turned out to be substantially higher in comparison to materials sintered from the same powders but without coating. The probable fields of use of the composites in question were determined.

scholarly journals Effect of complex modification on cement compositions

2018 ◽  
Vol 212 ◽  
pp. 01018
Author(s):  
Irina Enzhievskaya ◽  
Cyril Odintsov ◽  
Maxim Chekhlov
Keyword(s):  
High Performance ◽  
Mechanical Characteristics ◽  
Raw Materials ◽  
Ammonium Hydroxide ◽  
Joint Application ◽  
Cement System ◽  
Mineral Fillers ◽  
Mineral Additives ◽  
By Products ◽  
Physical And Mechanical Characteristics

The article deals with the modification of cement compositions by a complex of modifiers, including superplasticizers and finely dispersed mineral fillers (micro fillers), based on local raw materials and by-products of the industry, as well as being capable of improving the physical and mechanical characteristics of cement concretes and solutions. The expediency of joint application of finely dispersed fillers and superplasticizers for obtaining materials with high performance characteristics is shown. The studies described in the article are aimed at expanding the raw materials base of mineral additives in combination with superplasticizers and studying their behavior in the cement system. As finely dispersed mineral additives, the following were used in the work: ground limestone from the overburden from the Mazulsky deposit, waste from sawing the jadeite of the Kashkaraksky deposit, a pulverized fraction of waste from crushing the Berezovskoye gravel, and Novosibirsk microsilica. It is shown that the introduction of the waste from sawing jadeite into the composition of the cement, along with microsilica, leads to increasing strength at bending and compression at 28 days. In the process of manufacturing a concrete and mortar mixture with the addition of limestone flour, increased gas emission was visually observed. The interaction was observed between the finely dispersed limestone flour with additives of plasticizing effect with the observed emission of complex gases, such as ammonium hydroxide, ammonium nitrate, and others.

scholarly journals Study Smart-layer effect on the physical and mechanical characteristics of the samples from polymer composite materials under quasi-static loading

2020 ◽  
pp. 188-200
Author(s):  
G. S Shipunov ◽  
M. A Baranov ◽  
A. S Nikiforov ◽  
D. V Golovin ◽  
A. A Tihonova
Keyword(s):  
Composite Materials ◽  
Optical Fiber ◽  
Polymer Composite ◽  
Static Loading ◽  
Mechanical Characteristics ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Polymer Composite Materials ◽  
Physicomechanical Characteristics ◽  
Physical And Mechanical Characteristics

Currently, developments of the so-called Smart-constructions are relevant as they enable a real-time monitoring of changes in required values. Smart designs are widely used in the construction, automotive and aerospace industries. Technologies of creating products from polymer composite materials make it possible to introduce various sensors directly into the structure of a material, thereby create systems monitoring the state of structures. The most recommended for such implementation are fiber-optic sensors, which have a number of advantages over other sensors (luminescent, strain gauge, piezoelectric ones). However, when introducing the fiber-optic sensors, there is a number of difficulties, which are primarily associated with fragility of the optical fiber and lead to the breakdown of fiber-optic lines. As a result, it is necessary to develop a Smart-layer that will protect the optical fiber leads and will not significantly change the physical and mechanical characteristics. This paper aims to determine the stiffness and strength characteristics of samples made of polymer composite materials: reference samples, samples with embedded fiber-optic sensors, samples with embedded Smart-layers. In this work, a Smart-layer is understood as a coating that protects the fiber-optic sensors at the stage of implementation into a structure. The paper considers the following configurations of the Smart-layer: polymer reinforced mesh, polyamide and polyurethane layer. We analyzed and compared the influence of the embedded optical fiber and various configurations of the Smart-layer in the composite structure on the physicomechanical characteristics of the samples obtained under quasi-static loading (tension, compression, and interlayer shear). For a more detailed analysis of using the fiber-optic sensors and various configurations of the Smart-layer, the corresponding loads were simulated to assess their mechanical behavior. Based on the obtained physical and mechanical characteristics, a specific configuration of the Smart-layer was selected and justified for further researches.

scholarly journals Mathematical Apparatus for the Synthesis of Composite Materials with Specified Properties

2021 ◽  
Vol 1203 (2) ◽  
pp. 022011
Author(s):  
Eugenia Budylina ◽  
Irina Garkina ◽  
Alexander Danilov
Keyword(s):  
Composite Materials ◽  
Technological Process ◽  
Cognitive Modeling ◽  
System Analysis ◽  
Mechanical Characteristics ◽  
Extreme Values ◽  
Optimization Problems ◽  
Quality Criteria ◽  
Kinetic Processes ◽  
Physical And Mechanical Characteristics

Abstract The meaning of the creation and functioning of the system is defined as the achievement of extreme values of goals that unite the individual elements of the system into a single whole. Based on this, the main system attributes of composite materials are indicated. It is assumed that the systemic effect is generated by the systemic properties of quality criteria. The implementation of the technical task is initially determined at the stage of cognitive modeling with the establishment of intensive and extensive properties with the allocation of control parameters. Based on the cognitive map, hierarchical structures of quality criteria are determined, and in accordance with the selected quality criteria, the corresponding structural schemes of the system (for each selected scale level). Further, the system's quality criteria are formalized, and mathematical models are developed in accordance with each of the criteria. The main purpose of using system analysis is to apply the general principles of decomposition of the system into individual elements and establish connections between them, in determining the research goal and stages to achieve this goal (based on solving single-criterion optimization problems using the found optimal values). The formalization of the multicriteria problem and its solution are made based on the required operational values, the type of kinetic processes of the formation of the physical and mechanical characteristics of the material (determine its structure and properties). The problem of materials synthesis is reduced to the choice of the order and type of the differential equation; parametric identification within the chosen model; comparison of experimental and model kinetic processes at a given accuracy; adjusting the model (if necessary). Therefore, it is important to interpolate the kinetic processes of the formation of the main physical and mechanical characteristics of composite materials. The technological process is considered as a complex system consisting of elements of various levels of detail: from atomic to a separate process. Decomposition of the technological process consists in dividing it into basic operations (elements): preparation of materials, mixing of components, molding of a semi-finished product, heat treatment and additional operations. The effectiveness of this approach was confirmed in the development of chemically resistant sulfur composites, epoxy composites for radiation protection, etc. The initial prerequisite was the required operational values of the material and the type of kinetic processes. The results of effective use of interpolation models (including splines) of compressive strength, heat release, and shrinkage of composite epoxy materials are presented.

scholarly journals Determining the mechanical characteristics of composite materials reinforced with woven preforms

2021 ◽  
Vol 1 (7 (109)) ◽  
pp. 41-50
Author(s):  
Maryna Shevtsova ◽  
Andrii Kondratiev ◽  
Oleksii Andrieiev
Keyword(s):  
Composite Materials ◽  
Mechanical Characteristics ◽  
Experimental Studies ◽  
Compression Tests ◽  
Study Program ◽  
Good Convergence ◽  
Variable Nature ◽  
Rod System ◽  
Rod Model ◽  
Physical And Mechanical Characteristics

Reduction of the complexity of production of articles from composite materials is largely ensured by the use of reinforcing semi-finished products in which fibers pre-form a framework. Among all the variety of reinforcing systems, woven sleeves (preforms) occupy a special place. The high degree of deformability in a nonimpregnated condition makes it possible to lay this reinforcement on any surface without folds and cuts that provide preservation of strand continuity. This advantage of woven sleeves is accompanied by a change in local reinforcement angles and, consequently, the variable nature of physical and mechanical characteristics of the curved part surface. A method for calculating physical and mechanical characteristics of the composite based on preforms at any point of the part depending on the pattern of laying strands on a curved surface has been developed. The possibility of application of the rod model of the composite to describe physical and mechanical characteristics of the composite material with a woven reinforcement was analyzed. The model essence consists in that the composite is modeled by a diamond-shaped rod system. The rhombus sides serve as fibers and the diagonals as the binder. To verify the theoretical results and substantiate practical recommendations, a series of experimental studies were performed based on the formation of material specimens from two types of woven sleeves with different reinforcement angles. The experimental study program included tensile, bending, and compression tests. A fairly good convergence of theoretical and experimental data was obtained. For example, a square of the correlation coefficient was not less than 0.95 for the modulus of elasticity, not less than 0.8 for the Poisson's ratio, and not less than 0.9 for tensile and compressive strengths. This is the rationale for using the rod model to describe the considered class of composites. The use of the developed procedure will make it possible to increase the perfection of the considered class of designs and obtain rational parameters of the process of their manufacture.

scholarly journals Creep of a heterogeneous polymer cylindrical shell

2021 ◽  
Vol 1030 (1) ◽  
pp. 012091
Author(s):  
Vladimir Andreev ◽  
Batyr Yazyev
Keyword(s):  
Cylindrical Shell ◽  
Composite Materials ◽  
Internal Pressure ◽  
Mechanical Characteristics ◽  
Structural Elements ◽  
Filled Polymer ◽  
Heterogeneous Polymer ◽  
Physical And Mechanical Characteristics

Abstract The article deals with the problem of calculating an heterogeneous cylindrical shell made of a filled polymer, which is in the process of creep under the action of constant internal pressure and temperature. The calculation is based on the Maxwell -Gurevich equation, which has been repeatedly tested in the calculations of structural elements made of polymer and composite materials. The dependence of the physical and mechanical characteristics of the material on temperature is taken into account.

Determination of the Optimal Structure of a Layered Composite Material for Maximum Strength Characteristics

2021 ◽  
Vol 1040 ◽  
pp. 124-131
Author(s):  
Ljubov Aleksandrovna Bokhoeva ◽  
I.O. Bobarika ◽  
A.B. Baldanov ◽  
Vitaly Evdokimovich Rogov ◽  
Anna S. Chermoshentseva
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Mechanical Characteristics ◽  
Minimum Weight ◽  
Layered Composite ◽  
Number Of Layers ◽  
Reinforcing Material ◽  
Intensive Development ◽  
Physical And Mechanical Characteristics

Due to the intensive development of composite materials and technologies for producing parts from them, they are increasingly used in various industries, including the manufacture of products with increased requirements for the characteristics of final products (strength, stiffness, minimum weight, etc.). In this regard, the authors analyzed the possibility to optimize the layered structure of a composite material in order to give it a pronounced predictable anisotropy of properties required for the final product. Thus, the influence of the orientation of the fibers of the reinforcing material in different layers of the package and the number of layers of the package on the physical and mechanical characteristics of the hypothetical product were analyzed. The problem was solved through the example of the development of a wing for a hypothetical UAV.

Carbon and Glass Fibers for Polymer Composites

2019 ◽  
Vol 816 ◽  
pp. 19-26 ◽  
Author(s):  
Aues A. Beev ◽  
S.Yu. Khashirova ◽  
D.A. Beeva ◽  
M.U. Shokumova ◽  
R.B. Tkhakakhov
Keyword(s):  
Composite Materials ◽  
Polymer Composites ◽  
Polymer Composite ◽  
Mechanical Characteristics ◽  
Glass Fibers ◽  
Polymer Composite Materials ◽  
Surface Activation ◽  
Physical And Mechanical Characteristics

The paper gives a brief description of carbon and glass fibers used to obtain polymer composite materials with high thermal, physical and mechanical characteristics. Some methods for surface activation of carbon and fiberglass, which will be used to increase the adhesion interactions at the fiber-polymer boundaries, are presented.

The effect of dispersed filler on mechanical and physicochemical properties of polymer composites

2020 ◽  
pp. 096739112092904
Author(s):  
Anton Mostovoy ◽  
Amirbek Bekeshev ◽  
Lyazzat Tastanova ◽  
Marzhan Akhmetova ◽  
Pavel Bredihin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Polymer Composites ◽  
Mechanical Characteristics ◽  
Elasticity Modulus ◽  
Oxygen Index ◽  
Low Density ◽  
Burning Time ◽  
Dispersed Filler ◽  
Loss Of Mass

The influence of basalt filler on mechanical properties of polyethylene (PE)- and polypropylene (PP)-based composites, and the effect of basalt on heat resistance and inflammability of polymer composite materials were studied. The introduction of basalt into the composite increases its elasticity modulus. The best mechanical properties are observed when 40 parts by weight of basalt per 100 parts of low-density PE and high-density PE are introduced. At the same time, a slight decrease in the deformation at failure is observed in basalt-filled PE composites. Deformation before failure is reduced from 380% for original PE to 250% for the composite containing 40 mass of basalt per 100 parts of PE. In the case of PP, this tendency is not observed. Other mechanical characteristics of polymer composites slightly change with the introduction of basalt particles as a filler. Incorporating basalt into PE and PP influences the combustibility of composites: oxygen index increases 1.3 times compared with the unfilled polymers, self-burning time decreases more than 2 times, and the loss of mass during ignition in the air decreases 2.15 times for PE-based composite and 1.75 times for PP-based composite. All indicators of flammability vary additively to the content of basalt, which is a noncombustible material.

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