Features of Laser-Vibrometric Nondestructive Testing of Polymer Composite Materials Using Air-Coupled Ultrasonic Transducers

Derusova, D. A.; Вавилов, В. П.; Нехорошев, В. О.; Shpil’noi, V. Yu.; Druzhinin, N. V.

doi:10.1134/s1061830921120044

Cited by 11 publications

(5 citation statements)

References 20 publications

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“…The specific method is to take a certain mass of active agent and dissolve it in water to prepare the base liquid of different concentrations, and then, take a certain mass of acidified CNTs or complex and add it to the corresponding base liquid. After ultrasonic treatment at 50°C for 1 h and mechanical stirring for 30 min, fully dispersed nanofluid with each volume of 100 mL is prepared [ 11 ].…”

Section: Methodsmentioning

confidence: 99%

Influence of Nano-Cutting Fluid in New Cutting and Forming Processes on Heat Transfer Performance of Mechanical Engineering

Liu

2022

International Journal of Analytical Chemistry

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In order to strengthen the thermal conductivity of green cutting fluid and the influence of nano-cutting fluid from new cutting and forming processes on heat transfer performance of mechanical engineering, a research method was proposed based on the influence of nano-cutting fluid from new cutting and forming processes on heat transfer performance of mechanical engineering. The dispersion stability, thermal conductivity, and viscosity characteristics of the nanofluid were studied, and the effects of acidification treatment time, type and concentration of carbon tube particles, surfactants, and testing conditions on the above properties were analyzed. It was found that the filling rate of T321 was about 25% when CNTs were filled, and the optimal compounding ratio of the two surfactants, sodium dodecyl benzenesulfonic acid (SDBS) and Tween-80 (TW-80), for the preparation of stable dispersed nanofluids was 3 ∶ 7. The optimum ratio of compound active agent to carbon tube is 5 ∶ 1. When CNTs were acidified for about 9 h and dispersed in sufficient and stable condition, the thermal conductivity of the base liquid was increased by 110% by the composite, and the shape factor of CNTs had the most significant effect on the thermal conductivity. It was found that the composite nanofluids had higher thermal conductivity and lower viscosity than the nanofluids prepared by ordinary CNTs. This was due to the fact that surfaces of CNTs were chemically modified during the opening and internal filling process, so that the composite had better dispersion stability in the base fluid.

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Section: Methodsmentioning

confidence: 99%

Influence of Nano-Cutting Fluid in New Cutting and Forming Processes on Heat Transfer Performance of Mechanical Engineering

Liu

2022

International Journal of Analytical Chemistry

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Section: Measurement Of Vibration Characteristicsmentioning

confidence: 99%

“…A recent study demonstrated that an air-coupled magnetostrictive transducer (resonance frequency 22 ± 1.65 kHz), in combination with high-power ultrasonic generator (electrical power 0.63 ± 10% kW), provides a vibration displacement at the horn end of up to 30 μm by optimizing the horn design [ 13 ]. Commercial piezoelectric transducers, for example, Ultran ACU (resonance frequency 110 kHz), have revealed a vibration displacement of about 10 μm at the emitter end (generator voltage 70 V and alternating current frequency 113 kHz) [ 13 ]. In the same study [ 13 ], it was shown that continuous ultrasonic excitation using both piezoelectric and magnetostrictive transducers is accompanied by distortions in the amplitude of the resulting signal because of interference between incident and reflected waves.…”

Section: Measurement Of Vibration Characteristicsmentioning

confidence: 99%

“…Commercial piezoelectric transducers, for example, Ultran ACU (resonance frequency 110 kHz), have revealed a vibration displacement of about 10 μm at the emitter end (generator voltage 70 V and alternating current frequency 113 kHz) [ 13 ]. In the same study [ 13 ], it was shown that continuous ultrasonic excitation using both piezoelectric and magnetostrictive transducers is accompanied by distortions in the amplitude of the resulting signal because of interference between incident and reflected waves. The distortion magnitude depends on the distance between the emitter and a test object.…”

Section: Measurement Of Vibration Characteristicsmentioning

confidence: 99%

“…Correspondingly, during the process of relaxation, elastic waves are generated in a wide frequency range. The energy of vibrations is partially transformed in the ambient environment to form acoustic waves [ 13 ]. However, the mechanism described is scarcely studied, and it is believed that the analysis of the operation of air-coupled (non-contact) transducers represents an actual topic for further research.…”

Section: Introductionmentioning

confidence: 99%

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Developing Novel Gas Discharge Emitters of Acoustic Waves in Air for Nondestructive Testing of Materials

Derusova

Нехорошев

Shpil’noi

et al. 2022

Sensors

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This study was devoted to the development of novel devices and a methodology intended for generating ultrasonic waves in an air medium by using atmospheric pressure gas discharge. In the proposed electrode system, the discharge process was accompanied by the generation of acoustic waves on the emitter surface and, consequently, in the ambient air. The gas discharge emitter vibrations were analyzed by applying the technique of Scanning Laser Doppler Vibrometry (SLDV). It was shown that the magnitude of displacements matched the corresponding characteristics of classical piezoelectric and magnetostrictive transducers. The use of the Fast Fourier transform procedure supplied amplitude–frequency spectra of vibrations generated by the gas discharge emitter. The amplitude–frequency spectrum analysis showed that the proposed emitter was able to generate acoustic waves in the air with frequencies from 50 Hz to 100 kHz, and such a device can be used for the nondestructive testing (NDT) of materials. The results of the statistical analysis of vibration displacements in the repetitive pulsed mode were discussed. A non-stable characteristic of the vibration displacement of the emitter membrane was demonstrated. The parameters of such instability were associated with the features of gas discharge processes. In the experiments, the proposed gas discharge emitter was used in combination with SLDV for inspecting carbon-fiber-reinforced polymer composites. The experiments demonstrated the possibility of using an air-coupled gas discharge transmitter to generate acoustic waves in NDT applications.

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Damage localization using contact and non-contact narrow frequency band elastic wave generation

Wandowski,

Mindykowski,

Kudela

et al. 2023

Measurement

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Features of Laser-Vibrometric Nondestructive Testing of Polymer Composite Materials Using Air-Coupled Ultrasonic Transducers

Cited by 11 publications

References 20 publications

Influence of Nano-Cutting Fluid in New Cutting and Forming Processes on Heat Transfer Performance of Mechanical Engineering

Influence of Nano-Cutting Fluid in New Cutting and Forming Processes on Heat Transfer Performance of Mechanical Engineering

Developing Novel Gas Discharge Emitters of Acoustic Waves in Air for Nondestructive Testing of Materials

Damage localization using contact and non-contact narrow frequency band elastic wave generation

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