High-efficiency and high-accuracy digital speckle correlation for full-field image deformation measurement

2018 ◽  
Vol 57 (05) ◽  
pp. 1 ◽  
Author(s):  
Yu Lu ◽  
Jiang Han ◽  
Yonghong Wang ◽  
Xizuo Dan ◽  
Siyuan Bao ◽  
...  
Keyword(s):  
High Efficiency ◽  
High Accuracy ◽  
Deformation Measurement ◽  
Full Field ◽  
Image Deformation ◽  
Speckle Correlation ◽  
Digital Speckle ◽  
Digital Speckle Correlation

Automatic Measurement of Concrete Deformation Field under Uniaxial Compression Based on DSCM

2011 ◽  
Vol 320 ◽  
pp. 58-63 ◽  
Author(s):  
Wei Weng ◽  
Rui Dong Peng ◽  
Hong Bin Liu ◽  
Wei Jia Ma ◽  
Sheng Hua Zhang
Keyword(s):  
Uniaxial Compression ◽  
Experimental Studies ◽  
Correlation Method ◽  
Ccd Camera ◽  
Compression Process ◽  
Full Field ◽  
Digital Speckle Correlation Method ◽  
Speckle Correlation ◽  
Digital Speckle ◽  
Digital Speckle Correlation

As a kind of optical approach to measure full field deformation with the properties of non-contact, Digital Speckle Correlation Method (DSCM) has been adopted widely with the development of computer technology. The deformation of concrete under external loads is usually uneven and thus it should be characterized by full filed measurement so as to obtain accurate results. It should be effective for engineering to monitor the deformation of concrete by using digital speckle correlation method, and such monitoring is helpful to study the law of uneven deformation of concrete and discover its damage characteristics. The images of the surface of concrete specimens at the different stress were captured and recorded with a high-resolution CCD camera during uniaxial compression process. An own software was developed to analyze these images by DSCM. The nature texture of the specimen surface were searched and matched in different images, therefore the displacement field and the strain field of the surface of concrete specimens were calculated out. Experimental studies have shown that digital speckle correlation method can be well used to calculate the accurate deformation of concrete just through a direct photograph of concrete surface under different loads.

scholarly journals Calculation Principle and Test Applications for Digital Speckle Correlation Technology

2014 ◽  
Vol 8 (1) ◽  
pp. 237-242
Author(s):  
Yongsheng Liu ◽  
Zhang-lin CHEN ◽  
Wang Liu ◽  
Xinyu Dong
Keyword(s):  
Digital Image ◽  
Solution Process ◽  
Image Correlation ◽  
Widespread Application ◽  
Full Field ◽  
Speckle Correlation ◽  
Full Field Measurement ◽  
Calculation Results ◽  
Digital Speckle ◽  
Digital Speckle Correlation

With SSD algorithm and calculus process in detail computing, the basic calculation principles and the solution process from digital image to displacement of digital speckle correlation technology were described. Then the digital speckle correlation technology were used to the tensile test of CFRP plate embedded reinforcement beams, obtained the displacement cloud image and destruction rules of the specimens. The results show that the calculation results analyzed by the digital image correlation technology are in good agreement with the experimental phenomena. And the technology has the characteristic of full field measurement, simple operation, strong adaptability and high precision, so it has the widespread application prospect, especially suitable for application in the mechanical properties of materials under complex conditions, a large section of the destruction process monitoring and other fields.

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