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Your search keyword '"Alexenko, V. O."' showing total 46 results
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46 results on '"Alexenko, V. O."'

6. Ultrasonic welding of lap joints of PEI plates with PEI/CF-fabric prepregs.

Author

Alexenko, V. O., Panin, S. V., Bochkareva, S. A., Defang, Tian, and Panov, I. L.

Subjects
*ULTRASONIC welding, *POLYETHYLENEIMINE, *LAP joints, *DIGITAL single-lens reflex cameras, *SANDWICH construction (Materials), *STRAINS & stresses (Mechanics), *POISSON'S ratio
Abstract

The article explores the ultrasonic welding of lap joints using PEI plates and PEI/CF-fabric prepregs. The authors analyze the structure and mechanical properties of the joints and investigate the impact of different parameters on their formation. They find that the tensile strength of the joints is influenced by the CF-fabric content in the prepregs, with higher content resulting in greater strength. The thickness of the joints also varies depending on the duration of the ultrasonic welding process. The authors conclude that optimizing the parameters can lead to improved functional characteristics of the joints. [Extracted from the article]

Published
2024
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27. The effect of annealing of milled carbon fibers on the mechanical and tribological properties of solid-lubricant thermoplastic polyimide-based composites.

Author

Panin, S. V., Luo, J., Alexenko, V. O., Buslovich, D. G., Kornienko, L. A., Bochkareva, S. A., and Panov, I. L.

Subjects
CARBON fibers, THERMOPLASTIC composites, WEAR resistance, ELASTIC modulus, ALGORITHMS, YOUNG'S modulus
Abstract

The mechanical and tribological properties of polyimide (PI)-based composites loaded with polytetrafluoroethylene (PTFE) and milled carbon fibers (MCF) in the as received and annealed states were studied in order to increase adhesion to the polymer matrix. It has been shown that loading with micron-range MCF (200 μm) doubles elastic modulus of the composites while all other physical and mechanical properties remain at neat PI levels. The three-component composite loaded with annealed MCF and PTFE has possessed the highest wear resistance. In comparison with neat PI, its wear rate has decreased by 312 times for the metal-polymer tribological contact and by 286 times for the ceramic-polymer one. Based on the obtained experimental data, the most preferential conditions for their implementation (load-speed modes for the given types of the tribological contacts) have been determined using a developed computer algorithm. The designed solid-lubricant "PI + 10 wt% PTFE + 10 wt% MCFannealed" composite has been recommended for both metal-polymer and ceramic-polymer tribological units. [ABSTRACT FROM AUTHOR]

Published
2020
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28. Effect of Type and Size of KH550 Modified Filler on Mechanical and Tribotechnical Properties of UHMWPE Composites.

Author

Panin, S. V., Huang Qitao, Kornienko, L. A., Buslovich, D. G., and Alexenko, V. O.

Subjects
WEAR resistance, MICROFIBERS, GLASS fibers, SIZE, FILLER materials
Abstract

Mechanical and tribological properties of UHMWPE-based composites with various fillers (aluminum oxyhydroxide micron sized powder, wollastonite microfibers, chopped glass fibers) were studied. The fillers were functionalized with commercially available silane-containing KH550 modifier in order to increase adhesion to the matrix. A comparison on the coupling agent effect on the mechanical and tribological properties of UHMWPE composites loaded at the fillers variation of the content and size is carried out. It is shown that fillers’ functionalization is an efficient way to increase wear resistance of UHMWPE composites filled with powders and fibers (increase in wear resistance makes from 1.5 to 3.6 times). On the basis of obtained results, UHMWPE based composites with various size/content studied fillers (powder, fiber) functionalized with the coupling KH550 agent are recommended for industrial application in a wide range of loads and sliding velocities. [ABSTRACT FROM AUTHOR]

Published
2019
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39. Comparison of Structure and Tribotechnical Properties of Extrudable UHMWPE Composites Fabricated by HIP and FDM Techniques.

Author

Panin, S. V., Buslovich, D. G., Kornienko, L. A., Dontsov, Yu. V., Alexenko, V. O., and Ovechkin, B. B.

Subjects
ULTRAHIGH molecular weight polyethylene, CRYSTAL structure, TRIBOLOGY, FUSED deposition modeling, ISOSTATIC pressing, POLYMERIC composites
Abstract

Polymer-polymeric UHMWPE composites filled with polypropylene grade 21030 powder were fabricated: (i) by hot isostatic pressing (HIP) of two-component powder mixtures; and (ii) by 3D-printing through fused deposition modeling (FDM) from pellets obtained by extrusion mixing and consequent milling of the same polymer component mixture. It is shown that the formed permolecular structure plays a decisive role in providing tribotechnical and mechanical properties of extrudable polymer-polymeric composites with ultrahigh-molecular-weight polyethylene matrix. [ABSTRACT FROM AUTHOR]

Published
2018
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46. Method of Rheological Characterization of Polymer Materials by Identification of the Prony Viscoelastic Model According to Data of Static and Dynamic Accelerated Tests.

Author

Shil'ko, S. V., Gavrilenko, S. L., Panin, S. V., and Alexenko, V. O.

Subjects
RHEOLOGY, POLYMERS, VISCOELASTIC materials, ACCELERATED life testing, STATICS, ELASTIC modulus, JOINTS (Engineering)
Abstract

A method for determining rheological parameters of the Prony model describing the process of viscoelastic deformation of a material was developed based on the results of dynamic mechanical analysis. For the approbation of the method, static (uniaxial tension) and dynamic (three-point bending) mechanical tests of polymer composites were carried out. Based on the analytical dependence of the storage modulus on the parameters of the Prony model, the parameters of the shear function are determined. The results of the static and dynamic analysis are in good agreement. The proposed technique allows us to accelerate the determination of rheological parameters of polymer materials and recommend it to the calculation of the stress-strain state of structural elements and friction joints during their long operation at elevated temperature. [ABSTRACT FROM AUTHOR]

Published
2017
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