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Edge-illumination X-ray dark-field imaging for visualising defects in composite structures

Endrizzi, M; Murat, BIS; Fromme, P; Olivo, A; (2015) Edge-illumination X-ray dark-field imaging for visualising defects in composite structures. Composite Structures , 145 pp. 895-899. 10.1016/j.compstruct.2015.08.072. Green open access

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Abstract

Low velocity impact can lead to barely visible and difficult to detect damage such as fibre and matrix breakage or delaminations in composite structures. Drop-weight impact damage in a cross-ply carbon fibre laminate plate was characterized using ultrasonic C-scan measurements. This was compared to the results provided by a novel X-ray imaging technique based on the detection of phase effects, which can be implemented with conventional equipment. Three representations of the sample are provided: absorption, differential phase and dark-field. The latter is of particular interest to detect cracks and voids of dimensions that are smaller than the spatial resolution of the imaging system. The ultrasonic C-scan showed a large delamination and additional damage along the fibre directions. The damage along the fibre directions and other small scale defects were detected from the X-ray imaging. As the system is sensitive to phase effects along one direction at a time, the acquisition of an additional scan, rotating the sample 90 degrees around the beam axis, provides information in both fibre directions. These two techniques enable access to a set of complementary information, across different length scales, which can be useful in the characterization of the defects occurring in composite structures.

Type: Article
Title: Edge-illumination X-ray dark-field imaging for visualising defects in composite structures
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.compstruct.2015.08.072
Publisher version: http://dx.doi.org/10.1016/j.compstruct.2015.08.072
Language: English
Additional information: © Elsevier 2015. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: X-ray phase-contrast imaging; Dark-field imaging; Composite structures; Impact damage; Ultrasonics; C-scan
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1471083
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