Global-local deformation measurement of stress concentration structures using a multi-digital image correlation system

2020 ◽  
Vol 34 (4) ◽  
pp. 1655-1665 ◽  
Author(s):  
Taijun Zhao ◽  
Vinh Tung Le ◽  
Nam Seo Goo
Keyword(s):  
Stress Concentration ◽  
Digital Image Correlation ◽  
Digital Image ◽  
Local Deformation ◽  
Deformation Measurement ◽  
Image Correlation ◽  
Correlation System

scholarly journals Boundary Deformation Measurement by Mesh-Based Digital Image Correlation Method

2020 ◽  
Vol 11 (1) ◽  
pp. 53
Author(s):  
Lu Wang ◽  
Guangyan Liu ◽  
Tongzhen Xing ◽  
Haibin Zhu ◽  
Shaopeng Ma
Keyword(s):  
Stress Concentration ◽  
Digital Image Correlation ◽  
Digital Image ◽  
Correlation Method ◽  
Deformation Measurement ◽  
Image Correlation ◽  
Uniform Deformation ◽  
Quadrilateral Elements ◽  
Displacement Vectors ◽  
Boundary Deformation

Digital image correlation (DIC) is a popular photomechanics method for deformation measurement. The conventional subset-based DIC method obtains the displacement vectors at the subset centers, but cannot calculate the deformation on the specimen edges, which may contain very useful information because specimens usually have greater deformation on edges, especially on curved edges due to stress concentration. In this study, the capability of a mesh-based DIC method using 8-node quadrilateral elements (Q8-mesh-DIC) in boundary deformation measurement was investigated and highlighted for specimens with non-uniform deformation. The results were compared with those obtained by some conventional subset-based DIC methods, and the accuracy of the boundary deformation measurement was verified through simulated and real experiments. The Q8-mesh-DIC appears to be more suitable for the boundary deformation measurement of non-uniform deformation fields.

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