RESEARCH ARTICLE


Calculation Principle and Test Applications for Digital Speckle Correlation Technology



Yongsheng Liu*, Zhang-lin CHEN, Wang Liu, Xinyu Dong
School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, Jiangxi, 330013, China.


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Creative Commons License
© 2014 Liu et al;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, Jiangxi, 330013, China; Address correspondence to this author at the School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, Jiangxi, 330013, China; Tel: 85-971-87046707; Fax: 85-971-87046720; E-mail: yshliu07@126.com


Abstract

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.

Keywords: Beam strengthened with CFRP plate, correlation function, digital speckle correlation technology, SSD algorithm.