Research on Ultrasonic Array Total Focusing Imaging Method of Titanium Alloy Gradient Material with Multi-Layer Medium

doi:10.3901/JME.2024.14.069

Abstract

Abstract: Gradient materials of additive manufacturing titanium alloy have important application value in aerospace, weapon system performance improvement and structural weight reduction. Aiming at the problems of low signal-to-noise ratio (SNR) and difficulty in calculation and correction of focusing imaging algorithm caused by the inhomogeneity of multi-layer medium of gradient materials. By analyzing the propagation characteristics of ultrasonic wave in multi-layer medium, the formulas for calculating the reflection and transmission coefficient of each interface are given. The focusing acoustic field distribution model of the synthetic beam is established, and a fast calculation method for the propagation path of the ultrasonic array beam in multi-layer medium is proposed. A correction imaging algorithms of total focusing method (TFM) is established for the TA15-Ti2AlNb gradient material specimen prepared by additive manufacturing technology, the experimental results using linear array and annular array transducers show that this method can effectively improve the SNR and quantitative accuracy of internal defects in the gradient material.

Key words: ultrasonic array, multilayer medium, gradient material, total focusing imaging, propagation characteristics

CLC Number:

TB553

LI Wentao, ZHANG Wenbin, WANG Jun, ZHOU Zhenggan. Research on Ultrasonic Array Total Focusing Imaging Method of Titanium Alloy Gradient Material with Multi-Layer Medium[J]. Journal of Mechanical Engineering, 2024, 60(14): 69-76.

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