Effect of Pipe Bends on the Low-Frequency Torsional Guided Wave Propagation

Wave motion in pipe bends is much more complicated than that straight pipes, thereby changing considerably the propagation characteristics of guided waves pipes with bends. Therefore, a better understanding how propagate essential for inspecting pipelines The interaction between bend and most used non-dispersive torsional mode at low frequency small-bore studied this paper. Experiments are conducted on magnetostrictive system, it observed T(0,1) reflections conversions from to F(1,1) F(2,1) occur bend. magnitude increases increasing distance excitation frequency. amplitude mode-converted signals also distance, but decreases Because their longer bent path, test bending angle 180X those one 90X. even difficult scan large angle. present findings provide some insights into behave bends, they generalize application guided-wave inspection pipelines.