Characterization on vermicular graphite rate and tensile strength in vermicular graphite cast iron based on nonlinear ultrasonic technique

Tang, Yan; Mao, Hanying; He, Chunhua; Mao, Hanling; Bi, Yiwen; Huang, Zhengfeng; Li, Xinxin; Lin, Yongchuan

doi:10.1016/j.ultras.2024.107240

Cited by 2 publications

(1 citation statement)

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“…During the experiment on the 45-steel specimen, the incident wave angle was set to the first critical angle, which generated the fastest traveling wave, the critically refracted longitudinal wave [42,43]. Figure 11 showed the complete time-domain signal received by the sensor, with the wave in the red box representing the first arriving wave, which was the critically refracted longitudinal wave.…”

Section: Resultsmentioning

confidence: 99%

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

Wang,

Tang,

et al. 2024

Meas. Sci. Technol.

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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.

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Section: Resultsmentioning

confidence: 99%