Abstract
Background
Images from scanning electron microscopes, transmission electron microscopes and atomic force microscopes have been widely used in digital image correlation methods to obtain accurate full-field deformation profiles of tested objects and investigate the object’s deformation mechanism. However, because of the raster-scanning imaging mode used in microscopic observation equipment, the images obtained from these instruments can only be used for quasi-static displacement measurements; otherwise, spurious displacements and strains may be introduced into the deformation results if these scanning microscopic images are used directly in general digital image correlation calculations for moving and temporally deformed surfaces.
Objective
Realizing kinematic parameter and dynamic deformation measurements on a scanning electron microscope platform.
Methods
Establishing a scanning imaging model of moving and temporally deformed objects that contains motion and deformation equations, a scanning equation and an intensity invariance assumption for small deformations. Then proposing a scanning-digital image correlation (S-DIC) method based on combing the characteristics of the scanning imaging mode with digital image correlation.
Results
Quantitatively investigating the effects of the spurious displacements and strains introduced when using scanning images to represent moving and temporally deformed surfaces in the measurement results. Numerical simulations verify that the accuracy of the S-DIC method is 10−2pix for the displacement, 10−4 for the strain, 10−4pix/s for the velocity and 10−6s−1 for the strain rate. Experiments also show that the proposed S-DIC method is effective. Conclusions: The results of this work demonstrate the utility of S-DIC on the field of microscopic dynamic measurement.
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Acknowledgements
We would like to thank Ms. Man-Qiong Xu for her help with the in-Situ experiments in AML, school of Aerospace Engineering, Tsinghua University, Beijing, China. Thanks for the financial support of the National Natural Science Foundation of China (grant numbers 11632010, and 11872035).
Funding
This work was financially supported by the National Natural Science Foundation of China (grant numbers 11632010, and 11872035).
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Appendix
Appendix
To further verify the performance of the proposed S-DIC method, we apply the published image data provided by Society for Experimental Mechanics (https://sem.org/2ddic) [34] and S-DIC to calculate the displacement and strain fields they contain. Although these images are not captured with a scanning method, S-DIC can calculate the displacement and strain fields of the measured objects contained in these images in the same way as the traditional DIC method, as long as we set the scanning parameters\( {t}_D^{\prime }=0 \), tR = 0 and \( {t}_D^{\prime }={t}_E \) (tE is the Exposure time). Here, we select images of three motion and deformation modes, the Strain Gradient (contrast: 60 to 130), the Plate Hole (experiment 1) and the Rigid Motion experiment [34]. The calculation results are shown in Figs. 15 and 16, respectively. Figure 15(a) shows the Y-direction displacement fields of the first and tenth deformed images calculated by S-DIC with subset = 21, step = 5 for the rigid motion experiment (Sample 16 in the public image data). The mean displacements are −0.1003 pixels and − 1.006 pixels while the stage positions are at −0.1001 pixels and − 1.002 pixels respectively. These results indicate that the displacement accuracy of S-DIC could reach 10−3 pixels for such global imaging. The calculation results for non-uniformly deformed images caused by lens distortion (lower part of Fig. 15 (a)) show that our calculation results are consistent with those in [34]. Figure 15(b) shows the principal strain field of the image “oht_cfrp_11.tiff” for the plate hole specimen (Sample 12 in the public image data [34]) calculated by S-DIC with subset = 15, step = 3, and strain window = 5. Line cut plots show the principal strain taken vertically through the center of the specimen. The distribution of principal strain of the cut line is the same as the result in [34], the principal strain is changes from 0.0008 to 0.0068. The left picture of Fig. 16 shows the Y-direction strain field of the image “aab_b2_05.tif” calculated by S-DIC with subset = 21, step = 5, and strain window = 15 for the sinusoidal strain gradient (Sample 11 in the public image data) [34]. The right picture of Fig. 16 shows the strain of the cut line taken vertically through the center of the specimen. We compare the results calculated by S-DIC and ncorr-2D [35] under the same conditions in the right picture, which indicate that the strain values calculated by S-DIC and the general DIC method are consistent.
The above results show that our proposed S-DIC method has the same ability to calculate the displacement and strain fields for the global image as the conventional DIC method. As the conclusion given in the article, the S-DIC method is a further development and extension of the DIC method in the scanning imaging mode.
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Xie, H., Wang, Z., Liang, J. et al. Scanning-Digital Image Correlation for Moving and Temporally Deformed Surfaces in Scanning Imaging Mode. Exp Mech 60, 1079–1101 (2020). https://doi.org/10.1007/s11340-020-00634-0
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DOI: https://doi.org/10.1007/s11340-020-00634-0