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Bend Detection of Pipe Using Guided Waves



Modern industries rely heavily upon the pipeline infrastructure for the supply and distribution of required materials, which normally are high-temperature, high-pressure, explosive, inflammable gas/liquid, toxic, even radiant fluid. The pipelines usually achieve a very long operating life of 40–50 years. During their operation, pipelines can suffer from a wide variety of damage and aging defects. Some of the most common causes of failure in pipelines are corrosion, stress cracking, seam weld cracks, material flaws, and externally induced damage by excavation equipment. Stress rupture due to large deformation, such as bending under the external loading, is one of the damage in the pipe. Cylindrical guided waves based techniques have been proven to be effective and promising tools for the damage detection in pipes, in which guided wave can propagate along the span (axial direction) of the pipe at long distances. In this work, guided wave is employed to detect bend in the pipe. First, the propagation characteristics of guided waves affected by the bend is reviewed and analyzed. Numerical study is carried out to explore the detailed wave displacement, strain profile and so on. With the help of a special piezoelectric wafer, the newly generated modes due to the bend is detected by guided waves.


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