Abstract

Advancements in Nonlinear Ultrasonics (NLU) and Guided waves what is commonly termed as nonlinear guided waves enables to combine the penetration power of guided waves for early state damage detection and enhanced structural monitoring capabilities over a fairly large area. This study aims at the generation of harmonics for special case of excitation of SH0 mode on Aluminium sheet. Phase velocity matching criteria was ensured for the feasibility of harmonic generation. The simultaneous generation SH0 mode and S0 mode as even-harmonics was observed in numerical simulation and validation is performed with experiments. Each mode is travelling at different velocities so that they can be monitored separately for specific cases. An advantage of this generated S0 mode is that it is non-dispersive in nature as it is generated from a SH0 mode which is also non dispersive. As a result of this excitation we can study early state defects or micro-crack evaluation.

How to Cite:

VK, K. . & Balasubramaniam, K. ., (2019) “On simultaneous generation of SH0 and S0 harmonics by the excitation of SH0 nonlinear ultrasonic wave mode on aluminium plates”, Review of Progress in Quantitative Nondestructive Evaluation .