Reflection and mode conversion of guided waves at bends in pipes

Ariste´gui, Christophe; Cawley, Peter; Lowe, Mike
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p209
Academic Journal
Cylindrical guided waves propagating along a pipe wall can be used in a long-range test for corrosion and other defects. This method has been successfully developed for the detection of corrosion in pipes and is now in commercial use. It has been found that in some cases, it is possible to test round a bend in the pipe, while in other cases, there is severe signal loss at the bend so the region beyond the bend cannot be inspected reliably. This paper presents a systematic study of the effect of bends on the transmission of the axially symmetric L(0, 2) mode. The effect of the bend radius to pipe diameter ratio on the reflection and transmission of the incident mode and mode conversion to other modes is studied using finite element analysis, and the results are verified with experiments on small bore copper pipes. The work therefore determines the conditions under which testing beyond a bend will be feasible. © 2000 American Institute of Physics.


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