A reciprocal band-limited Green's function approach for modelling acoustic emission using the finite element method

2006 ◽  
Vol 292 (3-5) ◽  
pp. 802-823 ◽  
Author(s):  
R.R. Naber ◽  
H. Bahai ◽  
B.E. Jones
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Acoustic Emission ◽  
Green’S Function ◽  
Green's Function ◽  
Function Approach ◽  
The Finite Element Method ◽  
Band Limited ◽  
Element Method

Numerical Evaluation of a Band-Limited Green’s Function Using the Finite Element Method for Acoustic Emission Analysis

Volume 1 ◽  
2004 ◽  
Author(s):  
Ramez-Robert Naber ◽  
Hamid Bahai ◽  
Barry E. Jones
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Acoustic Emission ◽  
Green’S Function ◽  
Green's Function ◽  
The Finite Element Method ◽  
Transient Wave ◽  
Emission Analysis ◽  
Band Limited ◽  
Element Method

The ability to model transient wave propagation in solids and determine the Green’s function plays a major role in improving the reliability of quantitative source characterization of acoustic emission. In this work, the finite element method is employed to determine a numerical solution of the Green’s function of an isotropic plate due to a point source applied normally to the surface. The advantage of using the finite element method is that it can be extended to model realistic geometries that cannot be treated analytically. The numerical results presented here are based on a two-dimensional axisymmetric transient finite element analysis. A limited bandwidth approximation of a delta function is used (Hanning function) for modeling the source. Hence the solution is called the band-limited Green’s function. The exact analytical solutions of the Green’s function of an isotropic infinite plate are used to validate the numerical solutions. Further analysis is carried out to investigate the effects of varying the spatial resolution of the finite element model on the accuracy of the solutions. Finally, it is demonstrated how the results of the band-limited Green’s function can be used to accurately convolve the response of an arbitrary source function.

Acoustic emission propagation characteristics in plate structure with various materials, cracks and coating metal

2016 ◽  
Vol 231 (11) ◽  
pp. 2080-2088
Author(s):  
Kuanfang He ◽  
Zhi Tan ◽  
Yong Cheng ◽  
Xuejun Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Acoustic Emission ◽  
Guided Waves ◽  
Propagation Characteristic ◽  
Guided Wave ◽  
Propagation Characteristics ◽  
The Finite Element Method ◽  
Plate Structure ◽  
Element Method

The propagation characteristic of guided waves is important to acoustic emission nondestructive detection for the structural integrity of engineering components. The finite element method is introduced to study the propagation of guided waves in plate structure with different materials, cracks and coating metal. The displacement contours and wave curve at different receiving positions are examined first for the propagation characteristics of guided waves in plate structure with different homogeneous material of steel 45 and GCr15. Next, the interface reflection, refraction and diffraction characteristics of guided waves in plate structure with cracks and steel 45 with coating metal of aluminium 2024 are investigated. Finally, these FE results are compared with the mechanical pencil lead fracture experiment results. The results of this study clearly illustrate the accuracy and reasonableness of the finite element method to predict propagation characteristic of guided wave.

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