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

Abstract

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.]

Citation

De Meyere, R. M., Song, K., Gale, L., Harris, S., Edmonds, I. M., Marrow, T. J., …Gavaldà-Diaz, O. (2021). A novel trench fibre push-out method to evaluate interfacial failure in long fibre composites. Journal of Materials Research, 36(11), 2305-2314. https://doi.org/10.1557/s43578-021-00153-1

• 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
• DOI: https://doi.org/10.1557/s43578-021-00153-1
• Public URL: https://nottingham-repository.worktribe.com/output/13181135
• Publisher URL: https://link.springer.com/article/10.1557/s43578-021-00153-1