TY - JOUR
T1 - Visualization of delaminations in composite structures using a baseline-free, sparse array imaging technique based on nonlinear Lamb wave propagation
AU - Tabatabaeipour, Morteza
AU - Hettler, Jan
AU - Delrue, Steven
AU - Van Den Abeele, Koen
PY - 2017/11/1
Y1 - 2017/11/1
N2 - Environmental factors such as temperature and humidity influence the efficacy of defect imaging procedures based on the identification of changes between an intact state and the current state of a sample/component/structure in the presence of a defect. In this paper, we focus on the Reconstruction Algorithm for Probabilistic Inspection of Damage (RAPID) and propose a nonlinear Lamb wave version of RAPID to visualize a delamination in a composite structure without having to know anything about the intact state, i.e. a baseline free RAPID. Once the optimal frequency selection of Lamb waves in a pitch-catch configuration mode is performed, low and high excitation amplitude signal responses within a sparse array at that frequency are evaluated along each transducer-receiver path by analyzing a set of damage sensitive parameters: the correlation coefficient, the energy of the scaling subtracted signal, and the third harmonic ratio. Processing of this information leads to a corresponding probabilistic damage map of the area within the sparse array. The obtained results from a validation experiment demonstrate the capability of this nonlinear variant of RAPID for the identification of a delamination in a composite structure.
AB - Environmental factors such as temperature and humidity influence the efficacy of defect imaging procedures based on the identification of changes between an intact state and the current state of a sample/component/structure in the presence of a defect. In this paper, we focus on the Reconstruction Algorithm for Probabilistic Inspection of Damage (RAPID) and propose a nonlinear Lamb wave version of RAPID to visualize a delamination in a composite structure without having to know anything about the intact state, i.e. a baseline free RAPID. Once the optimal frequency selection of Lamb waves in a pitch-catch configuration mode is performed, low and high excitation amplitude signal responses within a sparse array at that frequency are evaluated along each transducer-receiver path by analyzing a set of damage sensitive parameters: the correlation coefficient, the energy of the scaling subtracted signal, and the third harmonic ratio. Processing of this information leads to a corresponding probabilistic damage map of the area within the sparse array. The obtained results from a validation experiment demonstrate the capability of this nonlinear variant of RAPID for the identification of a delamination in a composite structure.
UR - http://www.ingentaconnect.com/contentone/dav/aaua/2017/00000103/00000006/art00012
U2 - 10.3813/AAA.919128
DO - 10.3813/AAA.919128
M3 - Article
VL - 103
SP - 987
EP - 997
JO - Acta Acustica united with Acustica
JF - Acta Acustica united with Acustica
IS - 6
ER -