Cavitation in thermoplastic melts: New insights into ultrasound-assisted fibre-impregnation

Tzanakis, Iakovos; Khavari, Mohammad; Titze, Maik; Eskin, Dmitry

doi:10.1016/j.compositesb.2021.109480

Cited by 11 publications

(9 citation statements)

References 21 publications

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“…This leads to additional energy consumption at high ambient pressures, and the development of the cavitation cloud is consequently hindered. A similar spatial contraction of the cavitation cloud was observed by Tzanakis et al [6] in a highly viscous liquid.…”

Section: Resultssupporting

confidence: 83%

“…Oscillations generated by a piezoelectric element are transmitted through a stepped or tapered extension, where amplified tip movements cause acoustic waves. Tip geometries can vary from flat [5] , half-spherical [6] or conical shapes [7] , yielding different patterns of acoustic flows. Periodically induced acoustic oscillations cause cavitation bubbles to form and collapse in a violent manner.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of cavitation under ultrasonic horn tip – Proposition of an acoustic cavitation parameter

Kozmus

Zevnik

Hočevar

et al. 2022

Ultrasonics Sonochemistry

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Section: Resultssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Characterization of cavitation under ultrasonic horn tip – Proposition of an acoustic cavitation parameter

Kozmus

Zevnik

Hočevar

et al. 2022

Ultrasonics Sonochemistry

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“…Shock waves from collapsing cavitation bubbles have been the subject of interest to academics and industrialists due to their extraordinary potential of generating severe response dynamics in a variety of fields, ranging from biomedical sciences, nanomaterials, food processing, microelectronics, to liquid metal processing and additive manufacturing [1] , [2] , [3] , [4] , [5] , [6] . Also recently, fundamental studies investigated the spatial shock wave pressure in the cavitation centre and the threshold of shock waves upon solid–liquid impact respectively [7] , [8] further advancing the existing knowledge in the field.…”

Section: Introductionmentioning

confidence: 99%

Cavitation-induced shock wave behaviour in different liquids

Khavari

Priyadarshi

Morton

et al. 2023

Ultrasonics Sonochemistry

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“…Specially, when the ultrasonic amplitude is increased to 90.0 μm, the 𝑣 𝑣 of the laminates fabricated with the welding time of 15 s is decreased to 0.09 ± 0.06%. The melt thermoplastic produces cavitation effect under the ultrasonic field [22][23][24], which pushes the liquid around the fiber and facilitates impregnation. With the increase of ultrasonic amplitude and welding time, the cavitation effect is enhanced, reducing the void content.…”

Section: Void Content and Fiber Volume Fractionmentioning

confidence: 99%

“…Tzanakis et al [16] found the cavitation effect during the ultrasound-assisted fiber impregnation by the high-temperature cavitometer. It is found that the cavitation effect and its spatial distribution have obvious influence on the processes of ultrasound-assisted fiber impregnation.…”

Section: Introductionmentioning

confidence: 99%

Research on the fabrication of continuous carbon fiber reinforced polyamide 6 composites by means of ultrasonic vibration

Liu

Zhai²,

Li³

et al. 2022

Preprint

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Because of the high viscosity and poor fluidity of thermoplastic resin, it is easy to form void in thermoplastic composites fabricated by traditional methods. The introduction of ultrasonic vibration into the fabrication of thermoplastic composites promotes the flow of thermoplastic resin and improve the quality of thermoplastic composites. In this study, continuous carbon fiber reinforced polyamide 6 (CF/PA 6) composites were fabricated by ultrasonic vibration. The effects of ultrasonic amplitude and welding time on the temperature variations of the CF/PA 6 stack during the fabrication process were firstly studied. Meanwhile, the process of impregnation evolution was observed. Then, the quality of CF/PA 6 composites with different ultrasonic vibration parameters were evaluated from the aspects of carbon fiber (CF) fabric structure, carbon fiber diameter, void content, fiber volume fraction, and the flexural strength. The results show that increasing the ultrasonic amplitude and welding time can increase the fiber volume fraction and decrease the void content of CF/PA 6 composites. However, increasing ultrasonic amplitude and welding time result in a smaller carbon fiber diameter and worse CF-PA 6 interface properties. The CF fabric structure is sensitive to ultrasonic vibration parameters. Ultrasonic amplitude and welding time exceeding a certain threshold reduce the flexural strength of CF/PA 6 composites. The flexural strength of the composites is improved by increasing the ultrasonic amplitude and welding time within a limited window. Different from flexural strength, the flexural modulus of the composite increases with the increase of ultrasonic amplitude and welding time due to more compact CF fabrics in the composite laminates. In addition, the failure mode of composites is sensitive to the ultrasonic vibration parameters.

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Cavitation in thermoplastic melts: New insights into ultrasound-assisted fibre-impregnation

Cited by 11 publications

References 21 publications

Characterization of cavitation under ultrasonic horn tip – Proposition of an acoustic cavitation parameter

Characterization of cavitation under ultrasonic horn tip – Proposition of an acoustic cavitation parameter

Cavitation-induced shock wave behaviour in different liquids

Research on the fabrication of continuous carbon fiber reinforced polyamide 6 composites by means of ultrasonic vibration

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