Session: Virtual Presentations in Acoustics, Vibration, and Phononics

Paper Number: 89912

89912 - Investigating the Effect of Uniaxial Stress on Guided Wave Propagation in Plates by Wave Finite Element Method 

As an important part of long-range nondestructive testing and structural health monitoring technology, ultrasonic guided wave technology has been used in a wide range of applications in aerospace, petrochemical, transportation and other fields. However, variations in operating conditions such as external load change the propagation velocity of guided waves and affect the accuracy of the measurement results. Therefore, one of the biggest challenges in the engineering application of ultrasonic guided wave technology is understanding the effect of changes in environmental factors on the propagation characteristics of guided waves in order to identify guided wave modes that are sensitive only to structural damage. This paper extends the previously developed wave finite element method by introducing the prestressing effect in Murnaghan hyperelastic materials, and the dispersion curve of the prestressed waveguide structure are solved by dividing the numerical solution into two steps, which include the steady-state analysis of static pre-deformation and the eigenvalue solution of acoustic micro-turbulence. This paper proposes a mode-tracking algorithm based on image sequential alignment to achieve multimodal classification of guided wave dispersion curves and compare the changes in propagation characteristics of different guided wave modes by extracting the displacement distribution from the numerical results. This paper takes aluminum plate (Al 6060-T6) as an example, considers the geometric deformation under prestress, and utilizes the proposed method to investigate two cases: the effect of uniaxial stress on the phase velocity variation of guided wave modes when the guided wave propagates along the uniaxial stress direction, and the effect of different guided wave propagation directions on the phase velocity variation of guided wave modes when a constant uniaxial stress is applied. The results suggest that the fluctuation of the guided wave phase velocity owing to prestress is related to the applied stress, frequency thickness product, and propagation direction. The susceptibility of different guided wave modes to prestress varies. The zero-order horizontal shear wave (SH₀) and the fundamental antisymmetric mode (A₀) in the plate are less impacted by prestress, and the phase velocity change of the fundamental antisymmetric mode (A₀) is nearly zero under the specified frequency-thickness product. Finally, the model approach is validated by comparing its predictions to theoretical results from the literature, which match remarkably well. This study is an important guideline for the preferential selection of environmentally insensitive guided wave modes and excitation frequencies, correction of detection signals, and accurate assessment of engineering structure damage information in ultrasonic guided wave technology engineering applications.

Presenting Author: Xu Zhang China University of Petroleum (East China)

Presenting Author Biography: Xu Zhang, born in 1996, received his B.Eng. degree from China University of Petroleum ( East China ) in 2018. Now he is a Ph.D. student in the College of Pipeline and Civil Engineering, China University of Petroleum ( East China ). His main research interest includes ultrasonic testing technology and nondestructive testing ＆ evaluation of material mechanical properties. E-mail: b20060015@s.upc.edu.cn

Authors:

Xu Zhang China University of Petroleum (East China)
Gang Liu China University of Petroleum (East China)
Lei Chen China University of Petroleum (East China)