TY - JOUR
T1 - An elastodynami'c hybrid boundary element study for elastic guided wave interactions with a surface breaking defect
AU - Cho, Younho
AU - Rose, Joseph L.
N1 - Funding Information:
The authors wish to acknowledge the partial financial support of the Korea Research Foundation made in the program year of 1997 under Contract No. 1997-003-E00035 and Inje University in the program year of 1997. A special thank is also to the Electrical Power Research Institute and to the office of Naval Research for their financial support.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2000/7
Y1 - 2000/7
N2 - Elastic guided wave interactions with various defects are explored for investigating defect characterization possibilities by using a hybrid boundary element method (BEM) in combination with an elastodynamic boundary integral equation and the Lamb wave normal mode expansion technique. The BEM code accuracy is verified based on energy conservation and available bench marking data for guided wave scattering problems. Through two-dimensional (2-D) parametric studies for an arbitrarily shaped defect, from a surface breaking crack model to a round surface defect, a waveguide cross-section including a defect is locally selected as a model for a given incident mode, frequency and a specific set of material properties. Mode reflection and transmission factors are numerically calculated to evaluate mode sensitivities and to obtain the potentially good classification features. It turns out that the guided wave scattering profiles show quite different behaviors as functions of incident mode, frequency, defect shape and size in providing us with enough rich feature extraction information for defect classification and sizing analysis. The theoretical analysis can be used to establish efficient guidelines for both data acquisition and feature selection in a pattern recognition analysis program of study. Sample results are presented.
AB - Elastic guided wave interactions with various defects are explored for investigating defect characterization possibilities by using a hybrid boundary element method (BEM) in combination with an elastodynamic boundary integral equation and the Lamb wave normal mode expansion technique. The BEM code accuracy is verified based on energy conservation and available bench marking data for guided wave scattering problems. Through two-dimensional (2-D) parametric studies for an arbitrarily shaped defect, from a surface breaking crack model to a round surface defect, a waveguide cross-section including a defect is locally selected as a model for a given incident mode, frequency and a specific set of material properties. Mode reflection and transmission factors are numerically calculated to evaluate mode sensitivities and to obtain the potentially good classification features. It turns out that the guided wave scattering profiles show quite different behaviors as functions of incident mode, frequency, defect shape and size in providing us with enough rich feature extraction information for defect classification and sizing analysis. The theoretical analysis can be used to establish efficient guidelines for both data acquisition and feature selection in a pattern recognition analysis program of study. Sample results are presented.
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U2 - 10.1016/S0020-7683(99)00142-0
DO - 10.1016/S0020-7683(99)00142-0
M3 - Article
AN - SCOPUS:0033905003
SN - 0020-7683
VL - 37
SP - 4103
EP - 4124
JO - International Journal of Solids and Structures
JF - International Journal of Solids and Structures
IS - 30
ER -