Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/23668
Title: Cavitation in Thermoplastic Melts: New Insights into Ultrasound-Assisted Fibre-Impregnation
Authors: Tzanakis, I
Khavari, M
Titze, M
Eskin, D
Keywords: Ultrasound;Impregnation;Cavitation;Composite;Roving;Thermoplastic
Issue Date: 2021
Publisher: Elsevier
Citation: Composites Part B: Engineering
Tzanakis, I. et al. (2022) ‘Cavitation in thermoplastic melts: New insights into ultrasound-assisted fibre-impregnation’, Composites Part B: Engineering. Elsevier BV. doi:10.1016/j.compositesb.2021.109480
Abstract: The impregnation of continuous carbon fibre roving with thermoplastic melt is a challenging task due to the high viscosity and surface tension of the melt. A new technique is under development utilizing ultrasonic oscillations within the thermoplastic melt which encloses a fibre roving, to achieve fibre impregnation. Despite ultrasonic processing being very efficient, the specific conditions created in the thermoplastic melt have never been studied before. This study investigated whether cavitation effects could be present during ultrasound-assisted fibre impregnation. The observed acoustic effects allowed us to suggest the possible underlying mechanisms. For the purpose of the study a melt-bath impregnation setup with polylactide was built. To detect the cavitation effects and acoustic parameters a calibrated high-temperature cavitometer was used. The results showed the formation of small cavitation zones in the direct vicinity to the sonotrode tip where the fibre roving would be positioned. Therefore, the occurrence of cavitation was established, and induced effects like shock waves, microjets and microstreaming should be further considered for detailed investigation of the ultrasound-assisted impregnation mechanism.
URI: http://bura.brunel.ac.uk/handle/2438/23668
https://www.sciencedirect.com/science/article/pii/S1359836821008477
DOI: https://doi.org/10.1016/j.compositesb.2021.109480
ISSN: 0961-9526
Appears in Collections:Brunel Centre for Advanced Solidification Technology (BCAST)

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