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Shock and Vibration
Volume 2014, Article ID 434187, 6 pages
http://dx.doi.org/10.1155/2014/434187
Research Article

Numerical Time-Domain Modeling of Lamb Wave Propagation Using Elastodynamic Finite Integration Technique

1Center of Advanced Systems and Technologies (CAST), School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran 14399 57131, Iran
2Department of Mechanical Engineering, Islamic Azad University, Shushtar Branch, Shushtar, Iran
3School of Railway Engineering, Iran University of Science and Technology, Tehran 16846 13114, Iran

Received 19 October 2012; Accepted 19 November 2012; Published 10 July 2014

Academic Editor: Hamid Mehdigholi

Copyright © 2014 Hussein Rappel et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper presents a numerical model of lamb wave propagation in a homogenous steel plate using elastodynamic finite integration technique (EFIT) as well as its validation with analytical results. Lamb wave method is a long range inspection technique which is considered to have unique future in the field of structural health monitoring. One of the main problems facing the lamb wave method is how to choose the most appropriate frequency to generate the waves for adequate transmission capable of properly propagating in the material, interfering with defects/damages, and being received in good conditions. Modern simulation tools based on numerical methods such as finite integration technique (FIT), finite element method (FEM), and boundary element method (BEM) may be used for modeling. In this paper, two sets of simulation are performed. In the first set, group velocities of lamb wave in a steel plate are obtained numerically. Results are then compared with analytical results to validate the simulation. In the second set, EFIT is employed to study fundamental symmetric mode interaction with a surface braking defect.