Izvestiya of Saratov University.

Physics

ISSN 1817-3020 (Print)
ISSN 2542-193X (Online)

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Zlobina I. V., Bekrenev N. V., Churikov D. O. The effectiveness of the effect of microwave radiation and convection heating on the relaxation of internal stresses in cured polymer composite materials. Izvestiya of Saratov University. Physics , 2025, vol. 25, iss. 2, pp. 230-241. DOI: 10.18500/1817-3020-2025-25-2-230-241, EDN: FYLSEA

This is an open access article distributed under the terms of Creative Commons Attribution 4.0 International License (CC-BY 4.0).
Published online: 
30.06.2025
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Language: 
Russian
Heading: 
Nanotechnologies, nanomaterials and metamaterials
Article type: 
Article
UDC: 
621.365.5:620.172
DOI: 
10.18500/1817-3020-2025-25-2-230-241
EDN: 
FYLSEA

The effectiveness of the effect of microwave radiation and convection heating on the relaxation of internal stresses in cured polymer composite materials

Autors: 
Zlobina Irina V., Yuri Gagarin State Technical University of Saratov
Bekrenev Nikolaj Valeryevich, Yuri Gagarin State Technical University of Saratov
Churikov Danila Olegovich, Yuri Gagarin State Technical University of Saratov
Abstract: 

Background and Objectives: The relaxation of internal stresses in pressed carbon and fiberglass plastics under the action of bending loads after modification by heating in a thermal chamber and exposure to a microwave electromagnetic field has been studied. It is shown that for pressed carbon and fiberglass plastics under the influence of bending loads, relaxation processes of internal stresses are characteristic, the intensity of which is determined by the initial state of the material. Materials and Methods: In the experiment, three groups of carbon and fiberglass samples produced by Eurocomplant LLC in Kaluga were used in the form of plane-parallel plates with dimensions of 75x10x5 mm, cut from a panel with dimensions of 500x500x5 mm in the state of delivery. Experiments with the first group of samples were carried out using a special microwave technological installation assembled on the basis of the Zhuk-2–02 radiator (NPP Agroecotech LLC, Obninsk, Kaluga region, Russia) with a horn-type radiator. The time of microwave exposure was recorded upon reaching the set surface temperature determined by the Flir E-40 thermal imager (FLIR, USA). The second group of samples was heated in an artificial light-weather chamber Solarbox 522 model 1500e RH (COFOMEGRA SRL, Italy). The study of internal stress relaxation was carried out according to the three-point bending scheme on a laboratory computer installation with LabVIEW software (IP Mayorov, Orel, Russia). Results: Microwave exposure to carbon and fiberglass contributes to stress relaxation by (5.1–7.2)% and (6.5–9.8)%, respectively, depending on the magnitude of the external load. After heating in the thermal chamber, stress relaxation was noted by(4.4–6.8)% and (5.2–9.0)%. For control samples, the degree of relaxation is(4.3–6.5)% and (4.9–8.55)%, the process stops almost 3 times earlier than for experimental samples. On average, the degree of stress relaxation in samples after exposure to a microwave electromagnetic field is 18.5% and 12.8% higher for carbon fiber and fiberglass, respectively, compared with heating in a thermal chamber. Conclusion: Тhis indicates a greater effectiveness of the microwave method of heat treatment in order to stabilize the properties of PCM.

Key words: 
polymer composite materials
external load
internal stresses
relaxation
microwave electromagnetic field
heating in a thermal chamber
Acknowledgments: 
The work was supported by the Russian Science Foundation (project No. 23-79-00039 “Substantiation of the methodology of complex modification of composite materials for extreme operating conditions based on the study of phase-structural transformations under the influence of electrophysical influences of various frequency ranges”).
Reference: 
  1. Kolobkov A. S. Polymer composite materials for various aircraft structures (review). Proceedings of VIAM, 2020, no. 6–7, pp. 38–44 (in Russian). https://doi.org/10.18577/2307-6046-2020-0-67-38-44
  2. Klimenko O. N., Valueva M. I., Rybnikova A. N. Polymer and polymer-composite materials in sports (review). Proceedings of VIAM, 2020, no. 10, pp. 81–89 (in Russian). https://doi.org/10.18577/2307-6046-2020-0-10-81-89
  3. Razali N., Sultan M. T. H., Mustapha F., Yidris N., Ishak M. R. Impact damage on composite structures – A review. The International Journal of Engineering and Science (IJES), 2014, vol. 3, iss. 7, pp. 8–20.
  4. Moshinsky L. Ya. Epoxy Resins and Hardeners. Structure, Properties, Chemistry and Topology of Curing. Tel Aviv, Arcadia Press Ltd., 1995. 371 p. (in Russian).
  5. Korolkov V. I., Nektavtsev E. N., Safonov K. S., Ogurtsov P. S., Oganezov V. A., Pppov I. S., Samokhvalov V. V. Research of the processes of eliminating warpage of aviation products made of polymercomposite materials obtained by high-temperature molding. BMSTU Journal of Mechanical Engineering, 2021, no. 10, pp. 84–94 (in Russian). https://doi.org/10.18698/0536-1044-2021-10-84-94
  6. Kartashova E. D., Muyzemnek A. Yu. Technological defects of polymeric layered composite material. University Proceedings. Volga Region. Technical Sciences, 2017, no. 2 (42), pp. 79–89.
  7. Dementiev I. I., Ustinov A. N. Method of reducing residual stresses in composite elements of spacecraft structures. Almanac of Modern Science and Education. Technical Sciences, 2017, no. 6 (119), pp. 27–31 (in Russian).
  8. Perminov A. A., Sarvarova T. M., Shestakova N. K., Azheganov A. S. Stress relaxation processes survey in straincomposite with an epoxy matrix. Bulletin of Perm University. Physics, 2019, no. 2, pp. 55–62. https://doi.org/10.17072/1994-3598-2019-2-55-62
  9. Batrak V. E., Bobryashov V. I. The influence of long-term processes on the creep and relaxation of structural fiberglass. Vestnik NITS Stroitel’stvo, 2018, no. 3 (18), pp. 5–11.
  10. Startsev O. V., Kablov E. N., Makhonkov A.Yu. Regularities of transition of epoxy binding composites according to data from dynamical mechanical analysis. Herald of the Bauman Moscow State Technical University. Series Mechanical Engineering, 2011, no. S2, pp. 104–113 (in Russian).
  11. Azheganov A. S., Begishev V. P., Gorinov D. A., Lysenko S. N., Shardakov I. N. Development and relaxation of internal stresses in granular composites with an epoxy matrix. J. Appl. Mech. Tech. Phys., 2006, vol. 47, no. 4, pp. 104–114 (in Russian).
  12. Kablov E. N., Laptev A. B., Prokopenko A. N., Gulyaev A. I. Relaxation of polymer composite materials under the prolonged action of static load and climate (review). Part 1. Binders. Aviation Materials and Technologies, 2021, no. 4 (65), pp. 70–80 (in Russian). https://doi.org/10.18577/2713-0193-2021-0-4-70-80
  13. Zhavoronok E. S., Senchikhin I. N., Roldugin V. I. Physical aging and relaxation processes in epoxy systems. Polymer Science. Series A, 2017, vol. 59, no. 2, pp. 113–149 (in Russian). https://doi.org/10.1134/S0965545X17020109
  14. Dao B., Hodgkin J., Krstina J., Mardel J., Tian W. Accelerated agеing versus realistic agеing in aerospace composite materials. I. The chemistry of thermal agеing in a low-temperature-cure epoxy composite. Journal of Applied Polymer Science, 2006, vol. 102, iss. 5, pp. 4291–4303. https://doi.org/10.1002/app.27104
  15. Odegard G. M., Bandyopadhyay A. Physical Aging of Epoxy Polymers and Their Composites. J. Polym. Sci. Part B: Polym. Phys., 2011, vol. 49, no. 2, pp. 1695–1716. https://doi.org/10.1002/polb.22384
  16. Kanaeva N. S., Nizin D. F., Nizina T. A. Relaxation properties of polymer materials based on epoxy binders. Expert: Theory and Practice, 2022, no. 3 (18), pp. 42–46 (in Russian). https://doi.org/10.51608/26867818_2022_3_42
  17. Zheleznyakov A. S., Sheromova I. A., Starkova G. P. Modeling tension relaxation of composite materials at constant deformation. Fundamental’nye issledovanija [Fundamental Research], 2014, no. 1, pp. 2360–2364 (in Russian).
  18. Brovko A. V., Murphy E. K., Rother M. Waveguide microwave imaging: Spherical inclusion in a dielectric sample. IEEE Microwave and Wireless Comp. Lett., 2008, vol. 18, no. 9, pp. 647–649.
  19. Erenkov O. Yu., Isaev S. P., Shevchuk K. A. Elektrofizicheskoe modifitsirovanie svyazuyushchikh v tekhnologii kompositov [Electrophysical modification of binders in composite technology]. Khabarovsk, PNU Publ., 2020. 229 p.
  20. Arkhangelsky Yu. S. Spravochnaja kniga po SVCh-jelektrotermii [Reference book on microwave electrothermy]. Saratov, Nauchnaja kniga, 2011. 560 p. (in Russian).
  21. Abutalipova E. M., Aleksandrov A. A., Lisin Yu. V., Pavlova I. V., Shulaev N. S. Mathematical modeling of heating kinetics in polymeric coating pipeline metal system at microwave processing. Herald of Bauman Moscow State Technical University. Natural Sciences Series, 2017, no. 2 (71), pp. 118–128 (in Russian). https://doi.org/10.18698/1812-3368-2017-2-118-128
  22. Zhernosek S. V., Olshansky V. I. Modification of the structure of composite textile materials under the influence of microwave radiation. Izvestiya vysshikh uchebnykh zavedeii. Tekhnologiya tekstil’noi promyshlennosti, 2020, no. 6 (390), pp. 41–43.
  23. Mamontov A. V., Nefedov V. N., Khritkin S. A. A study of the temperature distribution in a polymer-composite rod when heat-treated with microradiation. Measurement Techniques, 2019, vol. 62, no. 4, pp. 365–370. https://doi.org/10.1007/s11018-019-01631-z
  24. Zlobina I. V., Bekrenev N. V., Egorov A. S., Kuznetsov D. I. Influence of microwave electromagnetic field on interlayer strength in cured polymer composite materials. Technical Physics, 2023, vol. 68, iss. 2, pp. 224–226. https://doi.org/10.21883/TP.2023.02.55476.201-22
  25. Zlobina I. V., Bekrenev N. V., Ignatiev M. A. Analysis of peculiarities of polymer matrix microstructure in PCMs formed under the influence of electrophysical effects. Plasticheskie massy, 2024, no. 2, pp. 12–16 (in Russian). https://doi.org/10.35164/0554-2901-2024-02-12-16
  26. Kim T., Lee J., Lee K.-H. Microwave heating of carbonbased solid materials. Carbon Letters, 2014, vol. 15, no. 1, pp. 15–24. https://doi.org/10.5714/CL.2014.15.1.015
  27. Kwak M. Microwave curing of carbon-epoxy composites: Process development and material evaluation. A thesis submitted to Imperial College London for the degree of Doctor of Philosophy. Imperial College London, 2016. 150 p. https://doi.org/10.1016/j.compositesa.2015.04.007
  28. Zlobina I. V., Bekrenev N. V. On the mechanism of increasing the mechanical characteristics of cured polymer composite materials under the action of a microwave electromagnetic field. Izvestiya of Saratov University. Physics, 2022, vol. 22, iss. 2, pp. 158–169 (in Russian). https://doi.org/10.18500/1817-3020-2022-22-258-169
Received: 
11.12.2024
Accepted: 
11.04.2025
Published: 
30.06.2025
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