Phase Reversal Method for Damage Imaging in Composite Laminates Based on Data Fusion

Wei Han,Huagen Yang,Kan Feng

doi:10.3390/app12062894

Abstract

This paper proposes a phase-reversal method (PRM) for damage imaging in plate structures. The PRM is a novel Lamb-wave-based method that mainly focuses on phase spectrum information of scattering waves reflected from a defect. The PRM reverses the phase angle along the propagation path by using the inverse Fourier transform first, and then the reversal reconstruction of the wave field in the frequency domain is performed for damage imaging. The proposed method analyzes the scattered wave field without using the baseline data and structural parameters. Moreover, dispersion characteristics and anisotropy are not involved in the process of damage positioning, thus making the PRM suitable for damage monitoring of composite laminates. To improve the PRM accuracy further, a combined addition and multiplication method of the correlation coefficient (CAMM) is proposed, which can reduce the effects of phase and noise artifacts and distortion. The results of the finite element simulations and experiments show that the combination of the PRM and CAMM methods can accurately locate damage in composite structures. Therefore, the PRM and CAMM methods have great application potential in damage imaging in composite laminates.

Highlights

Composite materials have been widely used in the fields of aerospace, defense industry, and civil industry because of their excellent properties, such as low density and high specific strength and modulus
Both numerical and experimental results show that the use of PWAS-tuned single-mode Lamb waves can greatly improve the effectiveness of the timereversal damage-detection procedure
The results show that the proposed method has great application potential in damage imaging and structural health monitoring of composite laminates

Summary

Introduction

Composite materials have been widely used in the fields of aerospace, defense industry, and civil industry because of their excellent properties, such as low density and high specific strength and modulus. Due to the complex manufacturing technology of composite materials and harsh service environment, damage is inevitable. This damage can reduce the strength of a structure and endanger its safety. The damage-detection method based on the ultrasonic Lamb wave has been efficient for large plate structures [6–8]. Xu et al [9] developed a theoretical model for the analysis of PWAS-related Lamb-wave time reversal. The theoretical model is first used to predict the existence of single-mode Lamb waves. Both numerical and experimental results show that the use of PWAS-tuned single-mode Lamb waves can greatly improve the effectiveness of the timereversal damage-detection procedure.

Methods

Results

Conclusion