Characterization of crack in ceramics using displacement measurement system based on digital image correlation method

2000 ◽  
Vol 2000.2 (0) ◽  
pp. 531-532
Author(s):  
Izuru Nishikawa ◽  
Hirokazu Ishimi ◽  
Keiji Ogura ◽  
M. A. Sutton
Keyword(s):  
Digital Image Correlation ◽  
Measurement System ◽  
Digital Image ◽  
Correlation Method ◽  
Displacement Measurement ◽  
Image Correlation ◽  
Digital Image Correlation Method

scholarly journals Use of Digital Image Correlation Method to Measure Bio-Tissue Deformation

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 924
Author(s):  
Terry Yuan-Fang Chen ◽  
Nhat Minh Dang ◽  
Zhao-Ying Wang ◽  
Liang-Wei Chang ◽  
Wei-Yu Ku ◽  
...  
Keyword(s):  
Digital Image Correlation ◽  
Measurement System ◽  
Digital Image ◽  
Biological Tissue ◽  
Correlation Method ◽  
Image Correlation ◽  
Optical Parameters ◽  
Tissue Deformation ◽  
Subset Size ◽  
Digital Image Correlation Method

Traditionally, strain gauge, extensometer, and reflection tracking markers have been used to measure the deformation of materials under loading. However, the anisotropy and inhomogeneity of most biological materials restricted the accessibility of the real strain field. Compared to the video extensometer, digital image correlation has the advantage of providing full-field displacement as well as strain information. In this study, a digital image correlation method (DIC) measurement system was employed for chicken breast bio-tissue deformation measurement. To increase the contrast for better correlation, a mixture of ground black pepper and white sesame was sprayed on the surface of samples. The first step was to correct the distorted image caused by the lens using the inverse distorted calibration method and then the influence of subset size and correlation criteria, sum of squared differences (SSD), and zero-normalized sum of squared differences (ZNSSD) were investigated experimentally for accurate measurement. Test results of the sample was translated along the horizontal direction from 0 mm to 3 mm, with an increment of 0.1 mm and the measurement result was compared, and the displacement set on the translation stage. The result shows that the error is less than 3%, and accurate measurement can be achieved with proper surface preparation, subset size, correlation criterion, and image correction. Detailed examination of the strain values show that the strain εx is proportional to the displacement of crosshead, but the strain εy indicates the viscoelastic behavior of tested bio-tissue. In addition, the tested bio-tissue’s linear birefringence extracted by a Mueller matrix polarimetry is for comparison and is in good agreement. As noted above, the integration of the optical parameter measurement system and the digital image correlation method is proposed in this paper to analyze the relationship between the strain changes and optical parameters of biological tissue, and thus the relative optic-stress coefficient can be significantly characterized if Young's modulus of biological tissue is known.

scholarly journals Dynamic Response Measurement of Elastic Structures Through Smart Digital Image Correlation Method and Calculation

2021 ◽  
Vol 2083 (4) ◽  
pp. 042016
Author(s):  
Jiawen Wang ◽  
Jingqi Liang ◽  
Rui Wang ◽  
Xiaobin Qi
Keyword(s):  
Digital Image Correlation ◽  
Measurement System ◽  
Digital Image ◽  
Elastic Plate ◽  
Correlation Method ◽  
Test System ◽  
Image Correlation ◽  
High Signal ◽  
Test Model ◽  
Digital Image Correlation Method

Abstract Based on the proper improvement and development of the basic principle of digital image correlation method, a 3D-DIC measurement system is built. Its measurement principle and application process can be divided into four steps: camera calibration, image acquisition, image matching and three-dimensional reconstruction. The measurement system can realize non-contact and full-field measurement and has the advantages of not being affected by the test environment, not imposing additional mass on the test model, and high signal-to-noise ratio of the measured data. Taking the elastic plate model as an example, the accuracy and reliability of the measurement system in the measurement of static and dynamic displacement response are verified by using the measurement results of laser displacement meter as a reference. In addition, the tensile strain of the projectile aluminum alloy tail model and the ground mode of the elastic plate are tested to further verify the practicability of the test system.

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