Pure SH0 wave tomography for delamination detection in aerospace composites

Hanfei Mei; Robin James; Victor Giurgiutiu

doi:10.1117/12.2582877

22 March 2021 Pure SH0 wave tomography for delamination detection in aerospace composites

Hanfei Mei, Robin James, Victor Giurgiutiu

Proceedings Volume 11593, Health Monitoring of Structural and Biological Systems XV; 115930P (2021) https://doi.org/10.1117/12.2582877
Event: SPIE Smart Structures + Nondestructive Evaluation, 2021, Online Only

Abstract

This paper presents an ultrasonic guided wave tomography for detecting and sizing delaminations in composites using pure shear horizontal (SH) wave. In this method, pure SH0 wave excitation was achieved using the adjustable angle beam transducers (ABT) in quasi-isotropic composite plates. First, a 3-mm quasi-isotropic composite plate with simulated delaminations by Teflon inserts was manufactured. Then, the ABT tuning angle of SH0 mode was calculated from the theoretical phase-velocity dispersion curve based on Snell’s law. Experiments were conducted on the 3-mm quasi-isotropic composite plate for pure SH0 wave excitation and delamination detection. It was found that a significant decrease in the signal amplitude was observed due to the delaminations. Finally, a linear scanning approach in 0° and 90° directions was conducted to cover the whole delamination area. The collected signals were used to visualize the damage through damage imaging methods. SH0 wave tomography based on the reconstruction algorithm for probabilistic inspection of defects (RAPID) was applied for delamination detection and characterization. The experimental results show that the SH0 wave tomography has a good performance for delamination detection, size estimation, and localization in aerospace composites.

Conference Presentation

Citation Download Citation

Hanfei Mei, Robin James, and Victor Giurgiutiu "Pure SH0 wave tomography for delamination detection in aerospace composites", Proc. SPIE 11593, Health Monitoring of Structural and Biological Systems XV, 115930P (22 March 2021); https://doi.org/10.1117/12.2582877

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