含微裂纹铝材的电磁超声Lamb波混频非线性检测及量化分析

doi:10.19595/j.cnki.1000-6753.tces.201235

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Abstract The detection of early micro crack is the key to structural failure analysis. In this paper, the method of Lamb waves mixing in electromagnetic ultrasound was used, considering the characteristics of interface respiration of micro crack. Based on the spring model and considering the hysteresis effect and damping force of the micro crack interface, a three-dimensional Lamb wave mixing nonlinear detection model with micro crack was established to simulate the micro crack at the action of mixed ultrasonic. The nonlinear interaction between mixing ultrasonic and micro crack interface was analyzed, and the influence of micro crack length and depth on mixing modulation effect was studied. Finally, an electromagnetic ultrasonic wave mixing nonlinear detection system was built. According to the different sensitivities of difference frequency and sum frequency nonlinear coefficients to the variation on micro crack length, a comprehensive coefficient factor was defined to quantitatively analyze the length of micro cracks. Based on the experimental data, the relationship between the comprehensive coefficient factor and the micro crack length was obtained, and the micro crack length was predicted. The experimental results show that the comprehensive coefficient factor can effectively predict the micro crack length.

Key words： Mixing Lamb wave electromagnetic ultrasound micro crack comprehensive coefficient factor three-dimensional model

Received: 15 September 2020

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TB551

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	Liu Suzhen
	Yang Shengzhe
	Yuan Luhang
	Zhang Chuang
	Jin Liang

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Liu Suzhen,Yang Shengzhe,Yuan Luhang等. Nonlinear Detection and Quantitative Analysis of Electromagnetic Ultrasonic Lamb Wave Mixing for Aluminum with Micro Crack[J]. Transactions of China Electrotechnical Society, 2021, 36(17): 3639-3648.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.201235 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I17/3639

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