Analysis of Ultrasonic Guided Wave Transmission and Reception Angle for Selective Mode Excitation in Composite Pipes

This study investigates the propagation characteristics of ultrasonic guided waves in glass-fiber-reinforced PMMA pipes using three distinct simulation models: a pure-PMMA wedge (Model ۱), an infinite-element boundary wedge configuration (Model ۲), and an epoxy-damped wedge (Model ۳). Time-domain signals were analyzed to evaluate amplitude, peak characteristics, and energy distribution across different incident angles. Time-shifting and envelope analysis were employed to align signals and identify the first excited modes. The results reveal that the largest peaks and energy maxima occur at different angles depending on the model and time window considered. Models ۲ and ۳ consistently produced higher peak amplitudes compared to Model ۱, demonstrating the influence of boundary condition implementation and damping on signal clarity and mode separation. Overall, incident angles of ۴۰°, ۴۵°, and ۵۰° consistently yielded superior performance in terms of first-mode excitation, peak amplitude, and energy within the targeted time interval across all models. These findings indicate that optimal excitation for maximizing signal energy and first-mode detectability does not necessarily coincide with the angle of maximum total energy. The study highlights the importance of selecting incident angles based on initially excited modes for accurate guided-wave analysis and provides insights for improving nondestructive evaluation and structural health monitoring in composite piping systems.

کلیدواژه ها:

Ultrasonic guided waves ، Composite pipes ، Signal energy analysis ، Mode excitation ، Wedge Configuration