Micro-crack in solids evaluation based on zero-frequency component of the critically refracted longitudinal wave

Author:

Wang Zhijiao,Tang WeiliORCID,Li XinxinORCID,Yang Yongjun,Bi Yiwen

Abstract

Abstract Micro-crack in engineering materials may cause subtle changes in mechanical properties, which can lead to serious engineering accidents. It is of great significance to study the identification of micro-cracks. In this paper, it is discovered that when the critically refracted longitudinal ( L CR ) wave propagates in elastic solids containing micro-crack, the waveform of ultrasonic waves becomes distorted, resulting in the generation of a zero-frequency component. The generated zero-frequency component provides a new research idea for micro-crack detection. Firstly, the paper derives the wave equation for nonlinear L CR wave and provides a preliminary analytical solution with a zero-frequency component. Subsequently, through a combined approach involving numerical simulation and experimental observation, along with micro-crack modeling, the study delves deeper into the acoustic nonlinear characteristics of the zero-frequency component under the breathing behavior of micro-crack. Finally, both numerical simulation and experimental methods show that the zero-frequency component based on L CR wave is feasible to detect micro-crack, and it is also proved that the zero-frequency component has higher sensitivity to micro-crack damage than the second and third harmonics.

Funder

Foundation of Guangxi Key Lab of Manufacturing System and the Foundation of Guangxi Key Lab of Manufacturing System and Advanced Manufacturing Technology

Natural Science Foundation of Guangxi Zhuang Autonomous Region

Publisher

IOP Publishing

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