Do high frequency acoustic emission events always represent fibre failure in CFRP laminates?

Oz, Fatih E.; Ersoy, Nuri; Lomov, Stepan V.

Abstract

© 2017 Elsevier Ltd When damage in carbon fibre reinforced composites (CFRP) is monitored by acoustic emission (AE), it is a common belief that high frequency AE events originate from fibre failure. This shows that this statement may not correspond to the reality, and matrix cracks can emit high frequency AE signals. Quasi-static tension of [−45 2 /0 2 /+45 2 /90 2 ] s laminates was monitored by AE, Digital Image Correlation (DIC) on the surface of the sample and in-situ optical microscopy on the sample's polished edge. Unsupervised k-means clustering algorithm was applied to the AE results. By comparison with the direct DIC and microscopic observations, the AE cluster with high frequency and low amplitude was found to correspond to directly observed matrix cracks.

• Journal Article Type: Article
• Acceptance Date: Oct 12, 2017
• Online Publication Date: Oct 13, 2017
• Publication Date: Dec 1, 2017
• Deposit Date: Jul 19, 2018
• Publicly Available Date: Jan 29, 2019
• Journal: Composites Part A: Applied Science and Manufacturing
• Print ISSN: 1359-835X
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 103
• Pages: 230-235
• DOI: https://doi.org/10.1016/j.compositesa.2017.10.013
• Keywords: damage mechanics, acoustic emission, digital image correlation (DIC), carbon fibre, polymer-matrix composites (PMC)
• Public URL: https://uwe-repository.worktribe.com/output/876915
• Publisher URL: http://dx.doi.org/10.1016/j.compositesa.2017.10.013
• Additional Information: Additional Information : This is the author's accepted manuscript. The final published version is available here: http://dx.doi.org/10.1016/j.compositesa.2017.10.013.
• Contract Date: Jul 19, 2018