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Smart Structures and Systems Volume 3, Number 4, October 2007 , pages 439-454 DOI: https://doi.org/10.12989/sss.2007.3.4.439 |
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A pre-stack migration method for damage identification in composite structures |
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L. Zhou, F. G. Yuan and W. J. Meng
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| Abstract | ||
| In this paper a damage imaging technique using pre-stack migration is developed using Lamb (guided) wave propagation in composite structures for imaging multi damages by both numerical simulations and experimental studies. In particular, the paper focuses on the experimental study using a finite number of sensors for future practical applications. A composite laminate with a surface-mounted linear piezoelectric ceramic (PZT) disk array is illustrated as an example. Two types of damages, one straight-crack damage and two simulated circular-shaped delamination damage, have been studied. First, Mindlin plate theory is used to model Lamb waves propagating in laminates. The group velocities of flexural waves in the composite laminate are also derived from dispersion relations and validated by experiments. Then the pre-stack migration technique is performed by using a two-dimensional explicit finite difference algorithm to back | ||
| Key Words | ||
| damage detection; pre-stack migration; Lamb wave; composite; Mindlin plate theory; structural health monitoring. | ||
| Address | ||
| L. Zhou; College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China F. G. Yuan; Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC 27695-7921, USA W. J. Meng; College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China | ||