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.
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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 |
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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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