Numerical Stability of Quantitative Characterization of Surface Cracks Using Laser Lock-in Thermography View Full Text


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Article Info

DATE

2022-07-05

AUTHORS

Jie Yang, Lihong Dong, Haidou Wang, En Lin, Sicong Zhai, Zhonghui An, Weiling Guo, Yanfei Huang

ABSTRACT

The quantification of crack depth on the surface of aluminum alloy is a very important and challenging problem in nondestructive testing. At present, most of the methods using laser thermography utilize the degree of difference in temperature amplitude on both sides of the crack as the indicator of crack depth quantification. With the increase of crack depth, the temperature amplitude index appears obvious ill-conditioned with the crack, which is not suitable for the quantitative characterization of deeper cracks. In this paper, the numerical stability of the indicators of amplitude and phase metrics used for crack depth quantification is comparatively investigated, and it is demonstrated that the defined phase metric, i.e., the relative phase lag, can quickly and stably quantify and characterize open cracks of 4 mm. This study lays the foundation for further quantification of deep cracks and provides a reference for future studies of vibration amplitude and temperature field phase variations in crack specimens of different depths. More... »

PAGES

132

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10765-022-03039-4

DOI

http://dx.doi.org/10.1007/s10765-022-03039-4

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https://app.dimensions.ai/details/publication/pub.1149251546


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