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Impact delamination detection of composites based on laser ultrasonic zero lag cross-correlation imaging

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Document pages: 8 pages

Abstract: In this paper, the zero lag cross-correlation (zlcc) imaging calculated by all non-contact laser scanning ultrasonic field is introduced to display the delamination caused by impact. The proposed technique can display the invisible delamination of composites in real time without installing any sensors. In addition, it provides robust damage diagnosis without comparing with the baseline data obtained from the undamaged state of the target structure, making it possible to minimize false alarms. Firstly, the existence of standing wave caused by internal delamination is proved by finite element analysis. Then, it shows how zlcc can physically isolate and visualize the standing wave characteristics from the measured ultrasonic field. Experiments verify the proposed techniqueique, a fully noncontact laser ultrasonic imaging system is introduced, and the internal delamination is visualized by laser scanning in a graphite fiber composite plate. The experimental results reveal that hidden delamination is successfully and automatically visualized and quantified without any users’ intervention.

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