Simulation of Steel Pipe Damage Detection with Ultrasonic Guided Wave
In order to study the problem of damage defect detection of steel pipe members in grid structure,the method of applying displacement at the end of the rod was selected for finite element analysis.Considering that the ultrasonic guided wave needed to have no dispersion in a specific frequency range,the L(0,2)mode ultrasonic guided wave was selected for non-destructive testing.The frequency and signal period characteristics of guided wave signals suitable for non-destructive testing of steel pipes were analyzed.The guided wave detection of circumferential defects with different circumferential angles and axial defects with different lengths was carried out by using L(0,2)mode guided wave.The finite element analysis results show that considering the influence of multi-mode superposition and maximum reflectivity,the ultrasonic guided wave excited by Hanning sine signal with a frequency of 70 kHz and 10 cycles is suitable for the defect detection of steel pipe members.When the width and depth of the steel pipe defect are constant,the ratio of circumferential damage to the circumference is linearly proportional to the average reflectivity of the signal.
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