Effect of surface roughness on friction in fibre-bundle pull-out tests

Johann Brandstetter (Corresponding author), Karl Kromp, Herwig Peterlik, Roland Weiss

    Publications: Contribution to journalArticlePeer Reviewed

    Abstract

    The fracture behaviour of ceramic-matrix composites is highly influenced by frictional conditions in the interface. In the present paper the influence of interfacial roughness and geometric misfit on the clamping stress is investigated by a specific fibre bundle pull-out test: this test is performed by the superposition of an external load perpendicular to the plies of a 2D endless fibre reinforced C/C composite. The superposition is achieved by means of a specially designed load frame, which acts as a load cell. With this principle of measurement the evolution of external and internal stresses during pull-out is obsessed and the Coulomb friction coefficient ? is calculated. A distinct decrease of the Coulomb friction coefficient in the course of the pull-out test was observed. This indicates a change in the surface roughness due to interfacial wear. The friction coefficient is furthermore dependent on the pull-out velocity: its increase leads to an increase of the friction coefficient. Œ 2004 Elsevier Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)981-988
    Number of pages8
    JournalComposites Science and Technology
    Volume65
    Issue number6
    DOIs
    Publication statusPublished - 2005

    Austrian Fields of Science 2012

    • 1030 Physics, Astronomy

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