Publication: Publication Date: 1 September 2017Testing Method: ,
Changes of Ultrasonic Guided Waves Propagating Through a Bend
Propagation of ultrasonic guided waves within the wall of straight pipe is becoming increasingly understood; however, guided waves within the wall of a curved section of pipe are more complex and less well known. Propagation of a guided wave through pipe bends results in signal distortion and mode conversion. This paper presents simulations that focus on the phenomena arising when guided waves with different central frequencies travel through bends with different angles and radii. A selection of the results is experimentally validated. It is shown that a destructive interference of guided wave signals happens when the combina-tion of the bend radius, bend angle, and central frequency of the incident guided wave signal is favorable. The study also finds that the amplitude of guided wave signals changes periodically with the increasing bend angle.
References
Bai, H., A.H. Shah, N. Popplewell, and S.K. Datta, “Scattering of Guided Waves by Circumferential Cracks in Steel Pipes,” Journal of Applied Mechanics, Vol. 68, No. 4, 2001, pp. 619–631.
Brath, A.J., F. Simonetti, P.B. Nagy, and G. Instanes, “Guided Wave Radia-tion From a Point Source in the Proximity of a Pipe Bend,” AIP Conference Proceedings, Vol. 1581, No. 1, 2014, pp. 316–323.
Catton, P.P., “Long Range Ultrasonic Guided Waves for the Quantitative Inspection of Pipelines,” doctorate thesis, Brunel University, 2009.
Cawley, P., and D.N. Alleyne, “The Interaction of Lamb Waves with Defects,” IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, Vol. 39, No. 3, 1992, pp. 381–397.
Demma, A., P. Cawley, M. Lowe, and B. Pavlakovic, “The Effect of Bends on the Propagation of Guided Waves in Pipes,” Journal of Pressure Vessel Technology, Vol. 127, No. 3, 2005, pp. 328–335.
Demma, A., P. Cawley, M. Lowe, and A.G. Roosenbrand, “The Reflection of the Fundamental Torsional Mode From Cracks and Notches in Pipes,” Journal of the Acoustical Society of America, Vol. 114, No. 2, 2003.
Demma, A., P. Cawley, M. Lowe, A.G. Roosenbrand, and B. Pavlakovic, “The Reflection of Guided Waves From Notches in Pipes: A Guide For Interpreting Corrosion Measurements,” NDT & E International, Vol. 37, No. 3, 2004, pp. 167–180.
Ditri, J.J., “Utilization of Guided Elastic Waves For the Characterization of Circumferential Cracks in Hollow Cylinders,” Journal of the Acoustical Society of America, Vol. 96, 1994.
Ditri, J.J., and J.L. Rose, “Excitation of Guided Elastic Wave Modes in Hollow Cylinders by Applied Surface Tractions,” Journal of Applied Physics, Vol. 72, No. 7, 1992.
Galvagni, A., and P. Cawley, “The Reflection of Guided Waves From Simple Supports in Pipes,” Journal of the Acoustical Society of America, Vol. 129, No. 4, 2011.
Gazis, D.C., “Three-dimensional Investigation of the Propagation of Waves in Hollow Circular Cylinders. I. Analytical Foundation,” Journal of the Acoustical Society of America, Vol. 31, No. 5, 1959a, pp. 568–573.
Gazis, D.C., “Three-dimensional Investigation of the Propagation of Waves in Hollow Circular Cylinders. II. Numerical Results,” Journal of the Acoustical Society of America, Vol. 31, No. 5, 1959b, pp. 573–578.
Hayashi, T., K. Kawashima, Z. Sun, and J.L. Rose, “Guided Wave Propaga-tion Mechanics Across a Pipe Elbow,” Journal of Pressure Vessel Technology, Vol. 127, No. 3, 2005, pp. 322–327.
Løvstad, A., and P. Cawley, “The Reflection of the Fundamental To rsional Mode From Pit Clusters in Pipes,” NDT & E International, Vol. 46, March 2012, pp. 83–93.
Lowe, M.J.S., and P. Cawley, “Long Range Guided Wave Inspection Usage—Current Commercial Capabilities and Research Directions,” Internal report, Imperial College, London, United Kingdom, 2006.
Nishino, H., “A Feasibility Study on Pipe Inspection Using Ultrasonic Guided Waves for Maintenance of Nuclear Power Plants,” Proceedings of the 4th International Symposium on the Ageing Management &Maintenance of Nuclear Power Plants, 27–28 May 2010, Tokyo, Japan, pp. 184–198.
Nishino, H., K. Yoshida, H. Cho and M. Takemoto, “Propagation Phenomena of Wideband Guided Waves in a Bended Pipe,” Ultrasonics, Vol. 44, December 2006, pp. e1139–e1143.
Rose, J.L., “A Baseline and Vision of Ultrasonic Guided Wave Inspection Potential,” Journal of Pressure Vessel Technology, Vol. 124, No. 3, 2002, pp. 273–282.
Rose, J.L., “Dispersion Curves in Guided Wave Testing,” Materials Evalua-tion, Vol. 61, No. 1, 2003, pp. 20–22.
Rose, J.L., Ultrasonic Waves in Solid Media, Cambridge University Press, Cambridge, United Kingdom, 1999.
Rose, J.L., L. Zhang, M.J. Avioli, and P.J. Mudge, “A Natural Focusing Low Frequency Guided Wave Experiment for the Detection of Defects Beyond Elbows,” Journal of Pressure Vessel Technology, Vol. 127, No. 3, 2005, pp. 310–316.
Sanderson, R.M., D.A. Hutchins, D.R. Billson, and P.J. Mudge, “The Inves-tigation of Guided Wave Propagation Around a Pipe Bend Using an Analytical Modeling Approach,” Journal of the Acoustical Society of America, Vol. 133, No. 3, 2013, pp. 1404–1414.
Sanderson, R. M., and P.P. Catton, “The Reflection of Guided Waves from Multiple Flaws in Pipes,” Journal of Nondestructive Evaluation, Vol. 32, No. 4, 2013, pp. 384–397.
Verma, B., T.K. Mishra, K. Balasubramaniam, and P. Rajagopal, “Interac-tion of Low-frequency Axisymmetric Ultrasonic Guided Waves with Bends in Pipes of Arbitrary Bend Angle and General Bend Radius,” Ultrasonics, Vol. 54, No. 3, 2014, pp. 801–808.
Volker, A., and T. van Zon, “Guided Wave Travel Time Tomography for Bends,” Review of Progress in Quantitative Nondestructive Evaluation, Vol. 32, 2013, pp. 737–744.
Wilcox, M.L.P., and P. Cawley, “The Effect of Dispersion on Long-Range Inspection Using Ultrasonic Guided Waves,” NDT & E International, Vol. 34, No. 1, 2001, pp. 1–9.
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