TY - GEN
T1 - Guided wave scattering and mixed mode conversions from 3-dimensional defects
AU - Luo, W.
AU - Zhao, Xiaoliang
AU - Rose, Joseph Lawrence
PY - 2005/4/9
Y1 - 2005/4/9
N2 - Ultrasonic guided waves have shown great potential for long range inspections of structures with large areas, such as pipes, vessels, rails, etc. The possibility of finding defects depends on whether scattered waves from a defect are detectable. For example, for a liquid-filled pipeline inspection using torsional waves, the incident waves may be converted to longitudinal waves, which could then leak into the liquid and become undetectable. Therefore, the wave mode conversion study of a defect, especially a 3-dimensional defect, becomes an interesting and valuable topic. The wave scattering and mode conversion of a through-wall hole in a plate was studied both experimentally and theoretically. Mixed mode conversions from SH modes to Lamb modes were demonstrated utilizing electromagnetic acoustic transducer (EMAT) guided wave techniques and a hybrid 3-D boundary element method. This mixed mode study could provide very useful guidance for guided wave inspection methodology. It is also very helpful in algorithm development for defect discrimination and sizing.
AB - Ultrasonic guided waves have shown great potential for long range inspections of structures with large areas, such as pipes, vessels, rails, etc. The possibility of finding defects depends on whether scattered waves from a defect are detectable. For example, for a liquid-filled pipeline inspection using torsional waves, the incident waves may be converted to longitudinal waves, which could then leak into the liquid and become undetectable. Therefore, the wave mode conversion study of a defect, especially a 3-dimensional defect, becomes an interesting and valuable topic. The wave scattering and mode conversion of a through-wall hole in a plate was studied both experimentally and theoretically. Mixed mode conversions from SH modes to Lamb modes were demonstrated utilizing electromagnetic acoustic transducer (EMAT) guided wave techniques and a hybrid 3-D boundary element method. This mixed mode study could provide very useful guidance for guided wave inspection methodology. It is also very helpful in algorithm development for defect discrimination and sizing.
UR - http://www.scopus.com/inward/record.url?scp=33748563092&partnerID=8YFLogxK
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U2 - 10.1063/1.1916666
DO - 10.1063/1.1916666
M3 - Conference contribution
AN - SCOPUS:33748563092
SN - 0735402450
SN - 9780735402454
T3 - AIP Conference Proceedings
SP - 105
EP - 111
BT - Review of Progress in Quantitative Nondestructive Evaluation Volume 24
T2 - Review of Progress in Quantitative Nondestructive Evaluation
Y2 - 25 July 2004 through 30 July 2004
ER -