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Researchers at Swiss Federal Laboratories for Materials Science and Technology (EMPA) Release New Data on Composite Materials

May 27, 2014



By a News Reporter-Staff News Editor at Journal of Technology -- Research findings on Composite Materials are discussed in a new report. According to news reporting originating from Thun, Switzerland, by VerticalNews correspondents, research stated, "Electrophoretic deposition (EPD) of carbon nanotubes (CNTs) on carbon fibers has been implemented as a continuous process on laboratory-scale. The interfacial adhesion and fracture toughness of the carbon fibers in an epoxy composite is assessed by a modified single-fiber push-out test."

Our news editors obtained a quote from the research from Swiss Federal Laboratories for Materials Science and Technology (EMPA), "A detailed energy analysis yields the different energy contributions in the push-out process. A comparison between CNT-deposited, as received and oxidized carbon fibers (passing through the EPD process without CNT) indicates that interfacial adhesion and fracture toughness are not affected by the different fiber treatments. Interfacial friction after fiber debonding, however, is significantly changed. This is confirmed by finite element simulation which has to include friction for reproducing the essential features of the load-displacement plots from fiber push-out. Scanning electron micrographs indicate little interaction between CNT and carbon fibers, but point to changes in surface roughness of CNT-deposited and oxidized fibers after push-out."

According to the news editors, the research concluded: "Therefore, the cyclic loading-unloading fiber push-out test seems well suited to investigate the micromechanical behavior of carbon fiber composites and to discriminate and quantify the different energy contributions to the total load-displacement curves."

For more information on this research see: Single fiber push-out characterization of interfacial properties of hierarchical CNT-carbon fiber composites prepared by electrophoretic deposition. Composites Science and Technology, 2014;95():121-127. Composites Science and Technology can be contacted at: Elsevier Sci Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, Oxon, England. (Elsevier - www.elsevier.com; Composites Science and Technology - www.elsevier.com/wps/product/cws_home/405929)

The news editors report that additional information may be obtained by contacting A. Battisti, Empa, Swiss Fed Labs Mat Sci & Technol, Lab Mech Mat & Nanostruct, CH-3602 Thun, Switzerland. Additional authors for this research include D. Esque-de los Ojos, R. Ghisleni and A.J. Brunner.

Keywords for this news article include: Thun, Europe, Switzerland, Composite Materials

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Source: Journal of Technology


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