Long range ultrasonic guided wave inspection is advancing rapidly and is 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 non-axisymmetric input to the elbow region, however, via partial loading around the circumference, allows natural focusing to occur because of angular profile variation around the circumference of the pipe. An experiment is reported here to demonstrate this process.
- Pressure Vessels and Piping Division
Natural Focusing for the Detection of Defects Beyond Elbows
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Rose, JL, Avioli, MJ, Jr., & Mudge, PJ. "Natural Focusing for the Detection of Defects Beyond Elbows." Proceedings of the ASME 2003 Pressure Vessels and Piping Conference. Ultrasonic Nondestructive Evaluation for Material Science and Industries. Cleveland, Ohio, USA. July 20–24, 2003. pp. 1-5. ASME. https://doi.org/10.1115/PVP2003-1845
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