Numerical Simulation and Experimental Study on Focusing of Magnetostrictive Guided Wave Phased Array in Pipeline

Based on the principle of ultrasonic phased array, the magnetostrictive phased array ultrasonic guided wave technology is established by using single channel mode ultrasonic guided wave technology. With the help of multi-frequency, multi-modal and multi-mode methods, the defect can be comprehensively located and judged, and the detection sensitivity of defect and damage can be improved. The detection principle of ultrasonic guided wave in magnetostrictive phased array is studied, and the delay overlay and focus model of phased array is established.. Algorithm model for calculating the circumferential and axial direction of circular phased array ultrasonic guided wave is established by numerical simulation. The focusing effect and resolution of defects with different axial distances and different circumferential angles were simulated by using matlab and abaqus finite element methods, and the focusing experiments with different axial distances and different circumferential angles were carried out. The feasibility of simulating the focusing effect and the accuracy of locating the defect are verified. Comparing the magnetostrictive phased array guided wave technology with mode single channel guided wave technology, it can be seen that the energy amplitude of the defect of magnetostrictive phased array guided wave technology is increased about two times, and the sensitivity of defect detection is improved.