Next Article in Journal
Preparation and Characterization of Montmorillonite/PEDOT-PSS and Diatomite/PEDOT-PSS Hybrid Materials. Study of Electrochemical Properties in Acid Medium
Previous Article in Journal
Synthesis of N-Doped ZnO Nanocomposites for Sunlight Photocatalytic Degradation of Textile Dye Pollutants
Open AccessArticle

Effect of Power Ultrasonic on the Expansion of Fiber Strands

Fraunhofer Institute for Casting, Composite and Processing Technology IGCV, 86159 Augsburg, Germany
*
Author to whom correspondence should be addressed.
J. Compos. Sci. 2020, 4(2), 50; https://doi.org/10.3390/jcs4020050
Received: 29 March 2020 / Revised: 27 April 2020 / Accepted: 30 April 2020 / Published: 8 May 2020
(This article belongs to the Special Issue Carbon Fiber Composites)
The present study investigates the effect of power ultrasonic on the expansion of fiber strands. A potential application of such expansion is in the production process known as closed injection pultrusion. The fiber strand in the pultrusion injection chamber is in compacted form, and so, any expansion of the fiber strand resulting from power ultrasonic should lead to improved fiber wetting. To investigate this, a wetted fiber strand was clamped on two sides and sonicated in the middle from below. The potential expansion of the fiber strand was visually determined through an observation window. The study concluded that power ultrasonic has a minimal to virtually negligible effect on the expansion of both glass and carbon fiber. The degree of expansion remains within a range of 3% maximum, with a standard deviation in the respective midpoint tests of up to 60% for glass fiber and over 100% for carbon fiber. This shows that the fibers are limited in their freedom of movement, and so no expansion can be achieved using power ultrasonic. A further increase in amplitude does not lead to any further expansion but to the destruction of the fibers. View Full-Text
Keywords: power ultrasonic; expansion; carbon fiber; glass fiber; pultrusion; closed-injection pultrusion power ultrasonic; expansion; carbon fiber; glass fiber; pultrusion; closed-injection pultrusion
Show Figures

Graphical abstract

MDPI and ACS Style

Wilhelm, F.; Strauß, S.; Weigant, R.; Drechsler, K. Effect of Power Ultrasonic on the Expansion of Fiber Strands. J. Compos. Sci. 2020, 4, 50.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop