Two-Steps Digital Image Correlation and Application to Studies of Micromechanics Behavior of Coating Interface


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In this paper, two-steps digital image correlation method is well advanced with the sub-pixel reconstruction in sub-image by utilizing the higher precision calculation of bicubic spline interpolation value method, and the accuracy of displacement is extended to better than 0.01 pixel, the strain resolution is limited to less than 0.0002 in micro-region. The experimental results show that the method of two-steps digital image correlation is an up-to-date technique to comprehensive investigations of base metal-coating composition at extremely small size scales. In the meantime, influence of crack in base metal perpendicular to interface on coating is directly observed, and the measurement of the residual compressive strain in base metal is performed according to different thickness of coatings. Lastly, the bond behavior between base metal and coating has been quantitatively analyzed, and the experimental results also prove the Ni-Lan coating is combined with base metal by toughened interface.



Key Engineering Materials (Volumes 336-338)

Edited by:

Wei Pan and Jianghong Gong




J. L. Chen et al., "Two-Steps Digital Image Correlation and Application to Studies of Micromechanics Behavior of Coating Interface", Key Engineering Materials, Vols. 336-338, pp. 1810-1813, 2007

Online since:

April 2007




[1] L. Tushinsky: Coated Metal (Springer-Verlag. Berlin, 2002).

[2] J.L. Chen, G.M. Xia, K.B. Zhou, et al.: Optics and Lasers in Engineering Vol. 43 (2005), p.836.

[3] J.L. Chen, H.M. Wan, Y.W. Qin, X.H. Ji: Key Eng. Mater. Vol. 308 (2005), p.959.

[4] J.L. Chen, C.R. Sun, Y.W. Qin, X.H. Ji: Proceedings of SPIE's 3rd International Conference on Experimental Mechanics, 2005, 5852, 455-461.

[5] K.B. Zhou: Study on two-steps digital image correlation method and its application[D], Tianjin University M.S. Dissertation, 2003(in Chinese).