Long range ultrasonic guided wave inspection is advancing rapidly and is quite commonplace today. Benefits of using longitudinal or torsional modes are being established in special circumstances of improved sensitivity, resolution, or penetration power. The possibility of inspection under insulation, coatings, or with water filled pipes or around elbows is possible. Detection of defects beyond a pipe elbow is difficult for axisymmetric wave impingement onto the elbow. For nonaxisymmetric input to the elbow region, however, via partial loading around the circumference, natural focusing occurs because of angular profile variation around the circumference of the pipe. Sample computations of possible angular profiles are illustrated. An experiment is also reported here to demonstrate this inspection process.
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August 2005
Research Papers
A Natural Focusing Low Frequency Guided Wave Experiment for the Detection of Defects Beyond Elbows
Joseph L. Rose,
Joseph L. Rose
Department of Engineering Science and Mechanics,
The Pennsylvania State University
, 212 Earth Engineering Sciences Bldg., University Park, PA 16802
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Li Zhang,
Li Zhang
Department of Engineering Science and Mechanics,
The Pennsylvania State University
, 212 Earth Engineering Sciences Bldg., University Park, PA 16802
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Michael J. Avioli, Jr.,
Michael J. Avioli, Jr.
FBS, Inc.
, 2134 Sandy Dr., Suite #14, State College, PA 16803
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Peter J. Mudge
Peter J. Mudge
Plant Integrity Ltd.
, Granta Park, Great Abington, Cambridge CB1 6AL UK
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Joseph L. Rose
Department of Engineering Science and Mechanics,
The Pennsylvania State University
, 212 Earth Engineering Sciences Bldg., University Park, PA 16802
Li Zhang
Department of Engineering Science and Mechanics,
The Pennsylvania State University
, 212 Earth Engineering Sciences Bldg., University Park, PA 16802
Michael J. Avioli, Jr.
FBS, Inc.
, 2134 Sandy Dr., Suite #14, State College, PA 16803
Peter J. Mudge
Plant Integrity Ltd.
, Granta Park, Great Abington, Cambridge CB1 6AL UKJ. Pressure Vessel Technol. Aug 2005, 127(3): 310-316 (7 pages)
Published Online: February 21, 2005
Article history
Received:
January 14, 2005
Revised:
February 21, 2005
Citation
Rose, J. L., Zhang, L., Avioli, M. J., Jr., and Mudge, P. J. (February 21, 2005). "A Natural Focusing Low Frequency Guided Wave Experiment for the Detection of Defects Beyond Elbows." ASME. J. Pressure Vessel Technol. August 2005; 127(3): 310–316. https://doi.org/10.1115/1.1989350
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