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Composite structures defect imaging

Fromme, P; (2018) Composite structures defect imaging. In: Kundu, T, (ed.) Health Monitoring of Structural and Biological Systems XII. SPIE Green open access

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Abstract

Carbon fiber laminate composites provide good strength to weight ratio for aerospace applications. Manufacturing imperfections and impact during the operation and servicing of the aircraft can lead to barely visible and difficult to detect damage. Impact can lead to delaminations and matrix or fiber cracks, reducing the load carrying capacity of the structure. Both ultrasonic and X-ray techniques have a good track record for the nondestructive testing of composite structures. Immersion ultrasonic C-scans were performed to measure the delamination extent for impact damage in a cross-ply composite specimen. Guided ultrasonic waves propagating along composite plates were employed for defect imaging. The first antisymmetric A0 Lamb wave mode was excited experimentally using piezoelectric transducers and measured using a laser vibrometer. X-ray imaging was used for the detailed visualization of the damages in the composite material. Application examples include carbon fiber composite plates with barely visible impact damage and manufacturing defects. The composite specimens and damage were characterized using ultrasonic measurements. Guided ultrasonic wave and X-ray imaging were used and the respective sensitivity for damage detection in composite panels is discussed.

Type: Proceedings paper
Title: Composite structures defect imaging
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 4 - 8 March 2018, Denver, Colorado, United States
ISBN-13: 9781510616967
Open access status: An open access version is available from UCL Discovery
DOI: 10.1117/12.2294522
Publisher version: https://doi.org/10.1117/12.2294522
Language: English
Additional information: © COPYRIGHT SPIE. This is the published version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Ultrasonics, Lamb Waves, Delamination, Composites, X-ray
UCL classification: UCL > Provost and Vice Provost Offices
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
URI: https://discovery.ucl.ac.uk/id/eprint/10053129
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