Dispersion curves for Lamb wave propagation in prestressed plates using a semi-analytical finite element analysis

2018 ◽  
Vol 143 (2) ◽  
pp. 829-840 ◽  
Author(s):  
Kranthi Peddeti ◽  
Sridhar Santhanam
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Wave Propagation ◽  
Lamb Wave ◽  
Dispersion Curves ◽  
Element Analysis ◽  
Lamb Wave Propagation

Structural damage detection using combined finite-element and model Lamb wave propagation parameters

2008 ◽  
Vol 223 (3) ◽  
pp. 769-777 ◽  
Author(s):  
C Ratnam ◽  
B S Ben ◽  
B A Ben
Keyword(s):  
Finite Element ◽  
Wave Propagation ◽  
Lamb Wave ◽  
Structural Damage ◽  
Pulse Generator ◽  
Ultrasonic Pulse ◽  
Element Analysis ◽  
Propagation Parameters ◽  
Set Up ◽  
Lamb Wave Propagation

This article presents a combined finite-element and model Lamb wave propagation parameters method for structural health monitoring. Modal analysis allows identifying the mode conversions induced by the defects. A simulation combining a planar, lossless finite-element analysis with Lamb wave propagation parameter is proposed. This analysis is performed on two aluminium bars in both undamaged and damaged states, where the two damaged states are: (a) one having a circular hole and (b) the other having a cut partway through the bar, perpendicular to the long axis of the bar. The Lamb wave propagation parameters are calibrated by using the ultrasonic pulse generator test set-up. The natural frequencies for the theoretical, finite element and experimental results are compared, and close agreement is found between the frequencies obtained experimentally and computationally.

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