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IJSTR >> Volume 9 - Issue 2, February 2020 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



Experimental Evaluation Of Surface Strain Measurement By Digital Image Correlation Based Subpixel Registration Technique

[Full Text]

 

AUTHOR(S)

S. Agnes Shifani, M.S. Godwin Premi

 

KEYWORDS

Sub pixel registration, strain, displacement, Ncorr, DIC

 

ABSTRACT

The development of Digital Image Correlation (DIC) have created a popular, attractive factor for full-field displacement and measuring strain. Inspite of its improvement, it is sufficiently used as a post-processing factor because of its computational cost and accuracy. In recent years, many researchers proposed new algorithms to improve the accuracy and speed using DIC. The objective of this work focus on subset image size and selection of seed points using image registration process along with average gradient of corner feature. With the help of image correlation method in strain measurement is executed from its first step of setting reference image, deformed images with different loads, matching the sub pixel location, selection of seed point to obtain strain field on surface under this research. The procedure of DIC method in utilizing open source platform Ncorr. Finally, the experimental output validation is evaluated from strain measurement and the result compared with strain value from UTM via tensile test. The strain from both strain gauge and DIC shows that the deviation is not exceeding more than 0.05 pixels.

 

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