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A novel trench fibre push-out method to evaluate interfacial failure in long fibre composites

De Meyere, Robin M.G.; Song, Kay; Gale, Louise; Harris, Stephen; Edmonds, Ian M.; Marrow, Thomas J.; Saiz, Eduardo; Giuliani, Finn; Armstrong, David E.J.; Gavaldà-Diaz, Oriol

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Robin M.G. De Meyere

Kay Song

Louise Gale

Stephen Harris

Ian M. Edmonds

Thomas J. Marrow

Eduardo Saiz

Finn Giuliani

David E.J. Armstrong

Oriol Gavaldà-Diaz


Traditional fibre push-outs for the evaluation of interfacial properties in long fibre ceramic matrix composites present their limitations—solutions for which are addressed in this work by introducing the novel trench push-out test. The trench push-out makes use of a FIB milling system and an SEM in-situ nanoindenter to probe a fibre pushed into a trench underneath, allowing in-situ observations to be directly correlated with micromechanical events. SiCf/BN/SiC composites—candidate material for turbine engines—were used as model materials in this work. Different fibre types (Hi-Nicalon and Tyranno type SA3) were coated with BN interphases, presenting mean interfacial shear stresses of 14 ± 7MPa and 20 ± 2MPa, respectively, during fibre sliding. The micromechanical technique enabled visualisation of how defects in the interphase (voids, inclusions & milled notches) or in the fibre (surface asperities, non-uniform coatings) affected the variability of interfacial property measurement. Graphic abstract: [Figure not available: see fulltext.]

Journal Article Type Article
Acceptance Date Mar 2, 2021
Online Publication Date Mar 23, 2021
Publication Date Jun 14, 2021
Deposit Date Nov 7, 2022
Publicly Available Date Nov 7, 2022
Journal Journal of Materials Research
Print ISSN 0884-2914
Electronic ISSN 2044-5326
Publisher Cambridge University Press
Peer Reviewed Peer Reviewed
Volume 36
Issue 11
Pages 2305-2314
Public URL
Publisher URL


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