Guided wave scattering analysis around a circular delamination in a quasi-isotropic fiber-composite laminate

Abstract

Carbon fiber reinforced composites are widely used in the aerospace industry, but barely visible impact damage can lead to delamination and compromise the structural integrity. The scattering of the fundamental anti-symmetric guided wave mode (A 0 Lamb mode) at an artificial circular delamination in a quasi-isotropic laminate was investigated experimentally. A 5 cycle Hanning windowed wave pulse was used as the excitation signal for the experiments. Fast Fourier Transform was employed to identify the guided wave amplitude of the scattered field along various directions. The experimental wavefield was captured using a laser Doppler vibrometer. Experimental results are presented for the scattering pattern and scattering amplitude as a function of distance from the damage. The results of this study can help to improve delamination detection techniques using guided waves and to gain physical insights into the scattering of guided waves at a delamination.

Guided wave scattering at a delamination in a quasi-isotropic composite laminate: Experiment and simulation

“…This contribution aims to improve the understanding of A0 mode scattering at a circular delamination in a quasi-isotropic carbon fiber reinforced composite (CFRC) laminate. Full field, non-contact laser measurements were performed on a composite panel containing an artificial delamination located at an asymmetric depth, building on preliminary results [38]. A 3D FE model containing a zero-volume ellipse shaped delamination was developed to provide comparison to the experimental results and the convergence of the FE model was discussed.…”

Guided wave propagation and scattering at composite delaminations

“…The scattering of the A0 wave mode at a zerovolume ellipse shaped delamination is investigated. The model is validated against full field, noncontact laser measurements performed on a CFRP panel containing an artificial insert delamination [22]. The effect of delamination shape and depth is investigated from a numerical parameter study.…”

Impact of Structural Health Monitoring on Aircraft Operating Costs by Multidisciplinary Analysis

“…Indeed, further critical tasks are needed once diagnosis is achieved. In addition, different stages can be identified, and likewise different methodologies can be adopted to perform those tasks [ 47 , 48 , 49 ]. Generally, the underlying concept in SHM is to record and store the structural response after a diagnostic or ambient excitation, post-process current dataset looking for features sensitive to any defect and relate such parameters to damage characteristics [ 50 , 51 , 52 ].…”