Numerical and experimental studies of delamination detection in short fiber reinforced composites using Lamb waves

Pawel Kudela; Maciej Radzienski; Wieslaw Ostachowicz

doi:10.1117/12.2217567

1 April 2016 Numerical and experimental studies of delamination detection in short fiber reinforced composites using Lamb waves

Pawel Kudela, Maciej Radzienski, Wieslaw Ostachowicz

Author Affiliations +

Proceedings Volume 9805, Health Monitoring of Structural and Biological Systems 2016; 980503 (2016) https://doi.org/10.1117/12.2217567
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2016, Las Vegas, Nevada, United States

Abstract

The aim of this paper is to present aspects of Lamb wave propagation in randomly oriented short fiber reinforce composites with delamination. Prediction of elastic constants is based on mechanics of composites, rule of mixture and total mass balance tailored to the spectral element mesh composed of 3D brick elements. Piezoelectric excitation as well as glue layer are taken into account. Complex full wave field includes multiple reflections at short fibers. This wave pattern is also obtained by the use of laser vibrometry confirming good quality of the model. Further studies are related to symmetrical and non-symmetrical delamination in respect to the thickness of the composite plate. Square delamination of the side length 10 mm is investigated. It has been found that reflections from delamination are mostly superimposed with reflections coming from short fibers. Hence, delamination detection by direct analysis of wave propagation pattern on the surface of the plate is ineffective. However, adaptive wavenumber filtering method overcome these difficulties and enables not only to detect the delamination but also is helpful for delamination size estimation. Moreover, the method is more effective if the full wavefield measurements are acquired on the surface of the plate which is closer to the delamination.

Citation Download Citation

Pawel Kudela, Maciej Radzienski, and Wieslaw Ostachowicz "Numerical and experimental studies of delamination detection in short fiber reinforced composites using Lamb waves", Proc. SPIE 9805, Health Monitoring of Structural and Biological Systems 2016, 980503 (1 April 2016); https://doi.org/10.1117/12.2217567

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