The Boundary Element Method for Flaw Classification in Wave Guides

Pelts, S. P.; Cysyk, Joshua; Rose, Joseph L.

doi:10.1007/978-1-4615-5947-4_18

Cited by 1 publication

(1 citation statement)

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“…This is a complex problem due to the number of variables involved and the fact that mode conversion generally occurs. For a given defect geometry and a given incident wave mode, the reflection coefficient can be calculated using finite element techniques (Alleyne and Cawley, 1992b) or other numerical techniques (Pelts et al, 1997). An approximate but not rigorous way of investigating the reflection of guided waves from defects is to look at the distribution of strain energy density (SED) of a mode through the thickness of the plate.…”

Section: Conclusion On Mode Suitabilitymentioning

confidence: 99%

Mode and Transducer Selection for Long Range Lamb Wave Inspection

Wilcox

Lowe²,

Cawley

2001

Journal of Intelligent Materials Systems and Structures

221

113

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Lamb waves can propagate many metres along plate and shell structures, and so have great potential in 'smart structure' applications where it is important for a transducer to interrogate a significant area of the surrounding structure. However, there are many different types of Lamb wave and in order to obtain simple signals that can be reliably interpreted, it is important to excite a single mode in a well controlled direction. The choice of which Lamb wave mode to use in a particular application depends on numerous factors, including the resolution required, the type of defects or damage to be detected, the attenuation and the available transduction options. This paper sets out a rational procedure for identifying suitable Lamb wave modes and operating frequencies for a particular inspection task. It is shown that the properties of the system to be inspected determine which mode and frequencies can be used, and that this then dictates the type of transducer required. A procedure for evaluating the performance of Lamb wave transducers is also demonstrated. As an illustrative example, it is shown that the well known angle incidence transduction technique is not generally suitable in applications where the structure to be inspected is liquid loaded. In such cases it is necessary to consider alternative transduction options such as electromagnetic acoustic transducers (EMATs) or shear piezoelectric devices.

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Section: Conclusion On Mode Suitabilitymentioning

confidence: 99%