Detection Method for Chamber of Large-caliber Artillery Barrel Based on Electromagnetic Ultrasonic Surface SH-wave

doi:10.3969/j.issn.1000-1093.2021.08.021

Abstract

Abstract: The inner bore surface of a large-caliber artillery barrel with drug chamber must be subjected to high temperature and pressure during the launching process. This may produce multi-network cracks and pose a hidden danger to safety and performance. The challenge remains that the traditional detection methods have higher requirements for inner wall cleanliness while the detection period takes a long time. A detection method based on electromagnetic acoustic transducer surface shear-horizontal(SH) wave is proposed to detect the cracks on the inner bore surface of a gun barrel with chamber. Quantitative detection is also carried out in assessing defects. This process includes establishing a finite element model relating to the radiated sound field of surface SH wave on permanent periodic magnet electromagnetic acoustic transducer(EMAT). The influences of length and pair number of permanent magnet on the radiated sound field are analyzed, and the design parameters of EMAT are optimized. In studying the characteristics of surface SH wave sound fields, a finite element model of the surface SH wave propagation in a gun barrel with the chamber with cross cracks was also established. The law of interaction relating to the surface SH wave and crack defects with different angles were verified through both study and experiment. The results illustrate that the electromagnetic acoustic transducer composed of 12 pairs of permanent magnets with length of 20 mm could be used to detect the cross cracks with 10 mm×1 mm×2 mm, and analyze the influence law of crack angle and echo amplitude.

Key words: artillery, electromagneticacoustictransducer, barrel, surfaceshear-horizontalwave, radiatedsoundfield, crosscrack

CLC Number:

ZHANG Jin， WANG Xuebin， SHI Wenze， DONG Zihua， DENG Haifei. Detection Method for Chamber of Large-caliber Artillery Barrel Based on Electromagnetic Ultrasonic Surface SH-wave[J]. Acta Armamentarii, 2021, 42(8): 1763-1770.

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