Effects of Adhesive Parameters on Dispersion Characteristics of Ultrasonic Guided Waves in Composite Pipes

Abstract

The aim of the investigation presented here was to understand how the viscosity parameters of an adhesive layer affect group velocity and attenuation of the double-layer adhered pipe. Various parameter combinations (attenuation of longitudinal wave and shear wave, pαL and qαT; thickness, d; and density, nρ) were utilized in order to generate different uncured degrees of the adhesive layer. In the frequency range 0∼500 kHz, the group velocity dispersion curves and attenuation dispersion curves were obtained from these models. Then, the group velocity and attenuation of the two commonly used modes, L0,2 and T0,1, were compared and analyzed. The results have shown that it is important to remark that little effect on group velocity was caused, and significant linear increases of attenuation occur with increase in q, d, and n. However, variable p had little effect on attenuation; more modes emerged when d increased or n decreased, causing difficulties on mode identification and signal processing. The numerical results provided a useful way to evaluate bonding quality by measuring the group velocity and attenuation in the pipelines.

Excitation and Propagation of Longitudinal L (0, 2) Mode Ultrasonic Guided Waves for the Detection of Damages in Hexagonal Pipes: Numerical and Experimental Studies

“…Ultrasonic guided waves technique [4][5][6][7][8][9][10][11][12] has recently emerged as a highly efficient inspection approach for largescale structures. It shows significant potentials in NDE (nondestructive evaluation) and SHM (Structural Health Monitoring) for the inspection of structures in various fields, i.e., plates [13][14][15][16][17], pipelines [18][19][20][21][22][23][24][25], railways [26][27][28][29], and other structures [30][31][32][33][34]. Ultrasonic guided wave testing method enables a line-to-line inspection style, which makes it quite suitable for the inspection of large structures.…”

Dispersion Compensation Method for Lamb Waves Based on Measured Wavenumber

“…Ultrasonic-guided wave is an efficient approach to nondestructive testing (NDT) [1][2][3][4] and structural health monitoring (SHM) [5,6] and material characterization applications [7]. Lamb waves are commonly used in plate structures because of the possibility of long traveling distance, large detecting area, and excellent inspecting sensitivities.…”