Laser-generated surface waves for quantitative detection of inclined surface cracks based on finite element analysis

ABSTRACT

In this paper, transmitted surface waves are used to quantitatively detect the length and angle of inclined surface cracks based on laser ultrasonic technique. The interaction between laser-generated surface waves and inclined surface cracks is analysed, and the propagation path and mode conversion process of the transmitted surface waves are considered. Then, the propagation paths of some peaks and troughs of the transmitted surface waves are obtained. Based on the obtained path and modal conversion information, a quantitative detection method for the length and angle of inclined surface cracks is proposed. The finite element method is used to verify the propagation paths and proposed method, and the results show that the arrival time of the theoretical path is consistent with that of the simulation. The relative measurement errors of the surface crack length and angle are less than 15% and 10%, respectively, which verifies the rationality and correctness of the proposed method.

KEYWORDS:

• Laser ultrasonic
• transmitted surface wave
• inclined surface crack
• quantitative detection

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant Nos. 52205561 and 52175521), the Fundamental Research Funds for the Provincial Universities of Zhejiang (Grant No. GK219909299001-020), and the Major Programme of Zhejiang Provincial Natural Science Foundation of China (Grant No. LD22E050010).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The work was supported by the National Natural Science Foundation of China [52205561; 52175521]; Fundamental Research Funds for the Provincial Universities of Zhejiang [GK219909299001-020]; the Major Programme of Zhejiang Provincial Natural Science Foundation of China [LD22E050010]