Regularized Global Digital Image Correlation Method for Crack Tip Deformation Field Measurement

Jianxin Du; Jiaqing Zhao; Haitao Wang; Libin Sun; Xinxin Wu

doi:10.3788/AOS202040.1112001

Acta Optica Sinica, Volume. 40, Issue 11, 1112001(2020)

Regularized Global Digital Image Correlation Method for Crack Tip Deformation Field Measurement

Jianxin Du, Jiaqing Zhao^*, Haitao Wang, Libin Sun, and Xinxin Wu

The Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China

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Figures & Tables(13)

Fig. 1. Reference and deformed images. (a) Reference image; (b) deformed image

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Fig. 2. RMSE of displacement field U versus element/subset size at crack front region

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Fig. 3. RMSE of strain field U_x versus element/subset size at crack front region

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Fig. 4. Comparison between the theoretical curve and optimum curves by different methods of strain U_x with optimum element/subset size at a straight line at crack front region

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Fig. 5. Relationship between RMSE of strain field U_x and Gaussian noise at crack front region by three methods

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Fig. 6. Relationship between RMSE of displacement field U and element/subset size for measurement on one side of crack face

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Fig. 7. Relationship between RMSE of strain field U_x and element/subset size for measurement on one side of crack face

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Fig. 8. Comparison between the theoretical curve and simulated curves by HRGDIC, HGDIC, 1-local, 2-local of strain field U_x with optimum element/subset size at a straight line on one side of crack face

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Fig. 9. Reference and deformed images. (a) Reference image; (b) deformed image

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Fig. 10. Comparison between strains U_x by three methods with optimum element/subset size at a straight line at crack front

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Fig. 11. Comparison between strains field U_x by three methods with optimum element/subset size at a straight line on one side of crack face

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Table 1. Element/subset sizes used by three methods for the measurement of deformation at crack front region
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Table 1. Element/subset sizes used by three methods for the measurement of deformation at crack front region
Number of element/subset size 1 2 3 4 5
Subset size of 1-local /pixel 11 15 21 25 31
Subset size of 2-local /pixel 11 15 21 25 31
Element size of HRGDIC /pixel 60 70 80 90 100

Table 2. Element/subset sizes used by three methods for the measurement of deformation on one side of crack face
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Table 2. Element/subset sizes used by three methods for the measurement of deformation on one side of crack face
Number of element/subset size 1 2 3 4 5
Subset size of 1-local /pixel 11 15 21 25 31
Subset size of 2-local /pixel 11 15 21 25 31
Element size ofHRGDIC /pixel 60 70 80 90 100

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Jianxin Du, Jiaqing Zhao, Haitao Wang, Libin Sun, Xinxin Wu. Regularized Global Digital Image Correlation Method for Crack Tip Deformation Field Measurement[J]. Acta Optica Sinica, 2020, 40(11): 1112001

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Paper Information

Category: Instrumentation, Measurement and Metrology

Received: Dec. 23, 2019

Accepted: Mar. 2, 2020

Published Online: Jun. 10, 2020

The Author Email: Jiaqing Zhao (jqzhao@mail.tsinghua.edn.cn)

DOI:10.3788/AOS202040.1112001

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Element/subset sizes used by three methods for the measurement of deformation at crack front region

Table 1. Element/subset sizes used by three methods for the measurement of deformation at crack front region

Table 2. Element/subset sizes used by three methods for the measurement of deformation on one side of crack face

Table 2. Element/subset sizes used by three methods for the measurement of deformation on one side of crack face