Linked Life Data

1597597

Source:http://linkedlifedata.com/resource/pubmed/id/1597597

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4 Pt 1
pubmed:dateCreated
1992-7-8
pubmed:abstractText
Transducer-excited beams provide important diagnostic tools for ultrasonic nondestructive evaluation (NDE) of elastic materials. For bonded multilayer elastic plates, an obliquely injected high-frequency compressional (P) beam creates interior dynamic fields that are sensitive to weak debonding between the layers. In an effort to clarify the wave phenomena that are operative under these conditions of excitation, a highly idealized model has been chosen wherein a lossless plate in vacuum is insonified by an internal oblique P-beam source. This problem was analyzed in a previous investigation [Lu, Felsen, and Klosner, J. Acoust. Soc. Am. 87, 42-53 (1990)] by expressing the total field in terms of a sum of P-S (vertically polarized or in-plane) coupled normal modes. While the resulting field assumed oscillatory modal patterns at interior cross sections far from the source region, the modally synthesized field near the source clearly outlined profiles interpretable as incident and singly or multiply reflected P-S coupled beams. The problem is therefore studied here directly by Gaussian beam tracing as implemented via our previously employed complex ray field algorithm. The results clarify the observed phenomena by revealing the successive buildup from initially well-resolved beams into oscillatory mode patterns synthesized by overlapping multiples. For the same idealized model, the beam algorithm has been applied elsewhere to the detection and identification of weak debonding in a layered plate [Felsen and Zeroug, J. Acoust. Soc. Am. 90, 1527-1538 (1991)]. With an understanding of the physical mechanisms that arise in the beam-to-mode conversion, one may now explore how their utility is affected under realistic NDE conditions.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0001-4966
pubmed:author
pubmed:issnType
Print
pubmed:volume
91
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2016-24
pubmed:dateRevised
2006-12-27
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Multiple reflected beam synthesis of fields excited by a high-frequency oblique beam input in an elastic plate.
pubmed:affiliation
Department of Electrical Engineering/Weber Research Institute, Polytechnic University, Farmingdale, New York 11735.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S.