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Proceedings Paper

A pre-stack reverse-time migration method for multidamage detection in composite structure
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Paper Abstract

In this paper a pre-stack reverse-time migration concept of signal processing techniques is developed and adapted to guided-wave propagation in composite structure for multi-damage imaging by experimental studies. An anisotropic laminated composite plate with a surface-mounted linear piezoelectric ceramic (PZT) disk array is studied as an example. At first, Mindlin Plate Theory is used to model Lamb waves propagating in laminates. The group velocities of flexural waves are also derived from dispersion relations and validated by experiments. Then reconstruct the response wave fields with reflected data collected by the linear PZT array. Reverse-time migration technique is then performed to back-propagate the reflected energy to the damages using a two-dimensional explicit finite difference algorithm and damages are imaged. Stacking these images together gets the final image of multiple damages. The experimental results show that the pre-stack migration method is hopeful for damage detection in composite structures.

Paper Details

Date Published: 11 April 2006
PDF: 10 pages
Proc. SPIE 6174, Smart Structures and Materials 2006: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, 617444 (11 April 2006); doi: 10.1117/12.685446
Show Author Affiliations
Wei-Jie Meng, Nanjing Univ. of Aeronautics and Astronautics (China)
Li Zhou, Nanjing Univ. of Aeronautics and Astronautics (China)
Fuh-Gwo Yuan, North Carolina State Univ. (United States)


Published in SPIE Proceedings Vol. 6174:
Smart Structures and Materials 2006: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems
Masayoshi Tomizuka; Chung-Bang Yun; Victor Giurgiutiu, Editor(s)

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