VIBROACOUSTIC CHARACTERISTICS OF COMPOSITE MATERIALS REINFORCED BY CARBON FIBRES
Abstract. Objectives The aim of the research is to study the features of the propagation of mechanical oscillation waves of ultrasonic frequency through composite materials, including those exposed to a microwave electromagnetic field. Methods The propagation of mechanical waves generated by a sourc...
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Dagestan State Technical University
2018-03-01
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| Series: | Вестник Дагестанского государственного технического университета: Технические науки |
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| Online Access: | https://vestnik.dgtu.ru/jour/article/view/455 |
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| author | Irina V. Zlobina Danila V. Morozov Sergey P. Pavlov |
| author_facet | Irina V. Zlobina Danila V. Morozov Sergey P. Pavlov |
| author_sort | Irina V. Zlobina |
| collection | DOAJ |
| description | Abstract. Objectives The aim of the research is to study the features of the propagation of mechanical oscillation waves of ultrasonic frequency through composite materials, including those exposed to a microwave electromagnetic field. Methods The propagation of mechanical waves generated by a source of ultrasonic vibrations is investigated in samples of composite materials reinforced by carbon fibres as used in aircraft construction. Results It is established that, when passing through a composite material, the frequency of the waves decreases by almost two orders of magnitude in comparison with the frequency of the driving dynamic force, while the method of laying reinforcing fibres has a significant effect: the greatest decrease in frequency is observed in composites with a quasiisotropic structure. When the oscillations pass directly through the metal surface, the frequency decreases by not more than an order of magnitude. The amplitude values of vibration acceleration increase with decreasing thickness of the samples and exceed by 2-3 times the waves obtained during the control passage through the steel surface of the gear. The sound pressure level changes from 4.1 Pa for samples with a quasi-isotropic structure to 8.4 Pa for samples reinforced with a metal grid. The processing of the investigated materials in a microwave electromagnetic field leads to a change in the character of the passage of the oscillation waves. The average for a specified period of time vibration acceleration value increases slightly (7-9%), while its unevenness decreases significantly (by between 0.2 and 6 times), i.e. vibrations become stable. For some materials (reinforced with a quasi-isotropic and laminated pressed metal mesh), the vibration acceleration values do not change at all during a cycle. Conclusion The obtained result can form the basis for developing technologies for creating structures from composite materials with stable vibroacoustic characteristics. |
| format | Article |
| id | doaj-art-5e3ccfd3c4f54ef4be573f166944950a |
| institution | Kabale University |
| issn | 2073-6185 2542-095X |
| language | Russian |
| publishDate | 2018-03-01 |
| publisher | Dagestan State Technical University |
| record_format | Article |
| series | Вестник Дагестанского государственного технического университета: Технические науки |
| spelling | doaj-art-5e3ccfd3c4f54ef4be573f166944950a2025-08-20T03:57:19ZrusDagestan State Technical UniversityВестник Дагестанского государственного технического университета: Технические науки2073-61852542-095X2018-03-01444293910.21822/2073-6185-2017-44-4-29-39385VIBROACOUSTIC CHARACTERISTICS OF COMPOSITE MATERIALS REINFORCED BY CARBON FIBRESIrina V. Zlobina0Danila V. Morozov1Sergey P. Pavlov2Yuri Gagarin State Technical University of Saratov.Yuri Gagarin State Technical University of Saratov.Yuri Gagarin State Technical University of Saratov.Abstract. Objectives The aim of the research is to study the features of the propagation of mechanical oscillation waves of ultrasonic frequency through composite materials, including those exposed to a microwave electromagnetic field. Methods The propagation of mechanical waves generated by a source of ultrasonic vibrations is investigated in samples of composite materials reinforced by carbon fibres as used in aircraft construction. Results It is established that, when passing through a composite material, the frequency of the waves decreases by almost two orders of magnitude in comparison with the frequency of the driving dynamic force, while the method of laying reinforcing fibres has a significant effect: the greatest decrease in frequency is observed in composites with a quasiisotropic structure. When the oscillations pass directly through the metal surface, the frequency decreases by not more than an order of magnitude. The amplitude values of vibration acceleration increase with decreasing thickness of the samples and exceed by 2-3 times the waves obtained during the control passage through the steel surface of the gear. The sound pressure level changes from 4.1 Pa for samples with a quasi-isotropic structure to 8.4 Pa for samples reinforced with a metal grid. The processing of the investigated materials in a microwave electromagnetic field leads to a change in the character of the passage of the oscillation waves. The average for a specified period of time vibration acceleration value increases slightly (7-9%), while its unevenness decreases significantly (by between 0.2 and 6 times), i.e. vibrations become stable. For some materials (reinforced with a quasi-isotropic and laminated pressed metal mesh), the vibration acceleration values do not change at all during a cycle. Conclusion The obtained result can form the basis for developing technologies for creating structures from composite materials with stable vibroacoustic characteristics.https://vestnik.dgtu.ru/jour/article/view/455composite materialsultrasonic vibrationsvibroacoustic characteristicscarbon fibresmicrowave electromagnetic field |
| spellingShingle | Irina V. Zlobina Danila V. Morozov Sergey P. Pavlov VIBROACOUSTIC CHARACTERISTICS OF COMPOSITE MATERIALS REINFORCED BY CARBON FIBRES Вестник Дагестанского государственного технического университета: Технические науки composite materials ultrasonic vibrations vibroacoustic characteristics carbon fibres microwave electromagnetic field |
| title | VIBROACOUSTIC CHARACTERISTICS OF COMPOSITE MATERIALS REINFORCED BY CARBON FIBRES |
| title_full | VIBROACOUSTIC CHARACTERISTICS OF COMPOSITE MATERIALS REINFORCED BY CARBON FIBRES |
| title_fullStr | VIBROACOUSTIC CHARACTERISTICS OF COMPOSITE MATERIALS REINFORCED BY CARBON FIBRES |
| title_full_unstemmed | VIBROACOUSTIC CHARACTERISTICS OF COMPOSITE MATERIALS REINFORCED BY CARBON FIBRES |
| title_short | VIBROACOUSTIC CHARACTERISTICS OF COMPOSITE MATERIALS REINFORCED BY CARBON FIBRES |
| title_sort | vibroacoustic characteristics of composite materials reinforced by carbon fibres |
| topic | composite materials ultrasonic vibrations vibroacoustic characteristics carbon fibres microwave electromagnetic field |
| url | https://vestnik.dgtu.ru/jour/article/view/455 |
| work_keys_str_mv | AT irinavzlobina vibroacousticcharacteristicsofcompositematerialsreinforcedbycarbonfibres AT danilavmorozov vibroacousticcharacteristicsofcompositematerialsreinforcedbycarbonfibres AT sergeyppavlov vibroacousticcharacteristicsofcompositematerialsreinforcedbycarbonfibres |