基于声子晶体的声发射波源检测概率研究

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Abstract Acoustic emission testing (AE) is a nondestructive method for evaluating material status that involves the acquisition and analysis of signals produced by damage. However, the unknown AE source during testing poses a challenge to the study of probability of detection (POD). Moreover, the reliability of the detection results when utilizing acoustic emission to identify interior material degradation can be directly influenced by the acoustic emission source, making the AE source's detection probability a crucial consideration in acoustic emission detection. In this study, we use the features of phononic crystal to form a physical stopband to filter out the noise signals. Then the acoustic emission signal due to the crack growth of aluminum metal compact tensile specimens under cyclic loading can be obtained. To further explore the influence of threshold level and systematic filter frequency on the POD, the parametric study was conducted. The AE source related POD was estimated experimentally, and the POD increases with the growth of fatigue cracks, herein, the peak POD happens in the process of cracking other than the end stage. In addition, with the proper selection of the threshold and filters, the AE results can be improved more reliable. Therefore, it is essential to assess the POD for the AE method.

Key words： acoustic emission (AE) probability of detection (POD) phononic crystal fatigue cracking

Received: 17 April 2023 Published: 15 April 2024

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	LI Hongyu
	ZENG Xiangxing
	ZHANG Lu

Cite this article:

LI Hongyu,ZENG Xiangxing,ZHANG Lu. Determination of POD of AE wave source based on phononic crystals[J]. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(7): 75-83.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2024/V43/I7/75

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