Abstract：
:The remote inspection for defects in large metallic elements such as pipes, tubes and plates is a field where guided waves are being applied with success. There are a number of situations where a surface coating is added for corrosion protection or insulation purposes. Since the coating materials are usually viscoelastic, the guided wave inspection range may be severely reduced unless a proper mode and an adequate frequency range is selected. Previous authors found the existence of low-attenuated modes at certain frequency ranges, which were used to detect and locate defects at reasonably large distances. This paper studies the potential of guided waves for not only locating but also sizing defects in plates with viscoelastic coatings. A hybrid finite element-boundary element method which explicitly includes the attenuating characteristics of the coating is used to determine Lamb and SH mode conversion factors at corrosion defects under the coating. Through parametric studies and analysis of the numerical results, some trends and features are highlighted that could be used for sizing purposes.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Galán JM,Abascal Rdoi
10.1016/j.ultras.2004.01.072subject
Has Abstractpub_date
2004-04-01 00:00:00pages
877-82issue
1-9eissn
0041-624Xissn
1874-9968pii
S0041624X04000800journal_volume
42pub_type
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