Numerical Simulation of Experimental Crack Detection in Pipes Using Low-frequency Torsional Guided Waves

摘要

The principles of buried pipeline non-excavation detection and the advantages of using the torsional guided wave of T (0,1) mode detection technology are described.By using the finite element code ANSYS,a finite element model with circumferentially oriented through-thickness cracks of axial widths was built to simulate crack detection in pipe using a torsional guided wave.The crack was defined by the method of removing elements and the torsional guided wave of T (0,1) mode -input simulated by prescribing axial displacements at one end of pipe,which was also the position of receiving the echo wave from the crack location.The results of numerical simulation showed that a single crack position could be accurately identified.A British guided wave’s Wavemaker G3 Pipe Screening System was used which receives torsional guided waves based on the piezoelectric effect.Using the Wavemaker G3 Pipe Screening System allowed detection of defects in the pipe experiment.The results showed excellent agreement among the numerical simulations and experiments conducted by the former investigators.