Lamb wave modelling and experimental study on acoustic emission using ANSYS


Abstract ANSYS finite element modelling software was used to study the velocity of the LAMB waves in metallic objects. For LAMB waves, velocities and frequencies are dependent on each other, therefore to pin down the source location with minimum error it is vital to study excited wave modes. Here, we have used Hsu-Nielson lead break test as an artificial acoustic emission (AE) source. For experiments in house developed AE prototype system and thin film transducers were used. We performed the lead break tests in finite element modelling software by selecting an appropriate exciting force, dividing the test object geometry into suitable elements shape and size and setting the calculations steps. The time difference between the arrival waves on each node revealed that the velocity of the lower order Lamb wave mode is more dominant. Finally, the theoretical simulation results were compared with experimental results which were found in good commitment, thus signifying that the use of finite element software ANSYS to simulate LAMB waves in acoustic emission experiments is viable and nominal.