Abstract
A three-dimensional (3D) micro-crack imaging technique is proposed for pipeline inspections. With non-classical nonlinear guided waves generated from micro-cracks recorded, the third harmonic waves are used to image the fatigued crack, with the help of time reversal process. A finite-difference time-domain (FDTD) code is programmed to solve the wave equations under cylindrical coordinates, and simulate the wave propagation process. A defect with hysteretic stress-strain behavior is embedded in the model; its interaction with guided waves generates nonlinear components, the harmonic components are time reversed and played back into the pipe, hence produce the image of the cracked area. The results show excellent spatial retrofocusing capability. The accuracy of localization depends on crack orientation angle and an adopted guided wave mode. [This work is supported by the National Natural Science Foundation of China (11104140) and Natural Science Foundation of Jiangsu Province (BK2011543)]
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