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

Tzanakis, Iakovos and Khavari, Mohammad and Titze, Maik and Eskin, Dmitry G. (2022) Cavitation in thermoplastic melts: New insights into ultrasound-assisted fibre-impregnation. Composites Part B Engineering, 229. Elsevier. doi: 10.1016/j.compositesb.2021.109480. ISSN 1359-8368.

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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.

Item URL in elib:https://elib.dlr.de/147684/
Document Type:Article
Title:Cavitation in thermoplastic melts: New insights into ultrasound-assisted fibre-impregnation
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Tzanakis, IakovosUNSPECIFIEDUNSPECIFIED
Khavari, MohammadUNSPECIFIEDUNSPECIFIED
Titze, MaikMaik.Titze (at) dlr.dehttps://orcid.org/0000-0001-5223-1538
Eskin, Dmitry G.UNSPECIFIEDUNSPECIFIED
Date:15 January 2022
Journal or Publication Title:Composites Part B Engineering
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:229
DOI :10.1016/j.compositesb.2021.109480
Publisher:Elsevier
ISSN:1359-8368
Status:Published
Keywords:Thermoplastic, Impregnation, Ultrasound, Fiber,
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Clean Propulsion
DLR - Research area:Aeronautics
DLR - Program:L CP - Clean Propulsion
DLR - Research theme (Project):L - Advanced Materials and New Manufacturing Technologies
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems
Institute of Composite Structures and Adaptive Systems > Adaptronics
Deposited By: Titze, Maik
Deposited On:20 Dec 2021 15:23
Last Modified:20 Dec 2021 15:23

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