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The effectiveness of patch repairs to restore the impact properties of carbon-fibre reinforced-plastic composites

Hall, Z. E.C.; Liu, J.; Brooks, R. A.; Liu, H.; Crocker, J. W.M.; Joesbury, A. M.; Harper, L. T.; Blackman, B. R.K.; Kinloch, A. J.; Dear, J. P.


Z. E.C. Hall

Research Assistant

R. A. Brooks

Professor of Energy Engineering

J. W.M. Crocker

Associate Professor - Composites Manufacturing

B. R.K. Blackman

A. J. Kinloch

J. P. Dear


The present paper studies the low-velocity impact testing of carbon-fibre reinforced-plastic (CFRP) pristine and patch-repair CFRP panels. Firstly, the effect of repeated impacts on the pristine CFRP damage growth is considered at impact energies of 7.5, 10.5 and 30 J. Secondly, such tests lead to a single-sided, patch-repair panel being manufactured by removing a 40 mm diameter central hole, to act as the ‘damaged area’, from the parent CFRP panel and then adhesively-bonding a circular CFRP patch-repair over the hole so generated. Various diameters and thicknesses for the CFRP patch-repair are employed and, in some cases, a CFRP circular plug is also used to fill the hole created by removal of the parent composite. The measured load versus time, and load versus displacement, traces are compared. Further, the extent and location of any interlaminar damage, i.e. delaminations between the plies of the CFRP, caused by the impact event are mapped using an ultrasonic C-scan technique. It is shown that single-sided patch repairs can be very effective in restoring the impact performance of damaged CFRP panels.


Hall, Z. E., Liu, J., Brooks, R. A., Liu, H., Crocker, J. W., Joesbury, A. M., …Dear, J. P. (2022). The effectiveness of patch repairs to restore the impact properties of carbon-fibre reinforced-plastic composites. Engineering Fracture Mechanics, 270, Article 108570.

Journal Article Type Article
Acceptance Date May 22, 2022
Online Publication Date Jun 6, 2022
Publication Date Jul 1, 2022
Deposit Date Jan 10, 2023
Publicly Available Date Jan 12, 2023
Journal Engineering Fracture Mechanics
Print ISSN 0013-7944
Electronic ISSN 1873-7315
Publisher Elsevier BV
Peer Reviewed Peer Reviewed
Volume 270
Article Number 108570
Keywords Mechanical Engineering; Mechanics of Materials; General Materials Science
Public URL
Publisher URL


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