Modeling of Lamb wave propagation with elastodynamic finite integration technique

2012 ◽  
Author(s):  
M. -U. Rahman ◽  
J. Prager
Keyword(s):  
Wave Propagation ◽  
Lamb Wave ◽  
Integration Technique ◽  
Finite Integration Technique ◽  
Lamb Wave Propagation

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

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Hussein Rappel ◽  
Aghil Yousefi-Koma ◽  
Jalil Jamali ◽  
Ako Bahari
Keyword(s):  
Wave Propagation ◽  
Lamb Wave ◽  
Steel Plate ◽  
Mode Interaction ◽  
Wave Method ◽  
Integration Technique ◽  
Finite Integration Technique ◽  
Analytical Results ◽  
Lamb Wave Propagation ◽  
Element Method

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.

Wave Propagation in a Micropolar Elastic Plate with Voids

2005 ◽  
Vol 11 (6) ◽  
pp. 849-863 ◽  
Author(s):  
S. K. Tomar
Keyword(s):  
Wave Propagation ◽  
Attenuation Coefficient ◽  
Elastic Material ◽  
Elastic Plate ◽  
Lamb Wave ◽  
Specific Model ◽  
Present Formulation ◽  
Numerical Computations ◽  
Lamb Wave Propagation ◽  
Symmetric And Antisymmetric Modes

Frequency equations are obtained for Rayleigh–Lamb wave propagation in a plate of micropolar elastic material with voids. The thickness of the plate is taken to be finite and the faces of the plate are assumed to be free from stresses. The frequency equations are obtained corresponding to symmetric and antisymmetric modes of vibrations of the plate, and some limiting cases of these equations are discussed. Numerical computations are made for a specific model to solve the frequency equations for symmetric and antisymmetric modes of propagation. It is found that both modes of vibrations are dispersive and the presence of voids has a negligible effect on these dispersion curves. However, the attenuation coefficient is found to be influenced by the presence of voids. The results of some earlier works are also deduced from the present formulation.

Influence of damaged area on lamb wave propagation in composite plate

2004 ◽  
Vol 35 (2) ◽  
pp. 85-93 ◽  
Author(s):  
Cunli Wu ◽  
Xiasheng Sun ◽  
Shihui Duan ◽  
Tong Fang
Keyword(s):  
Wave Propagation ◽  
Lamb Wave ◽  
Composite Plate ◽  
Lamb Wave Propagation
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