Journal
JOURNAL OF THEORETICAL AND APPLIED MECHANICS-BULGARIA
Volume 42, Issue 2, Pages 55-66Publisher
SCIENDO
DOI: 10.2478/v10254-012-0008-x
Keywords
digital image correlation; correlation coefficient
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Digital Image Correlation (DIC) is a computer based image analysis technique utilizing random patterns, which finds applications in experimental mechanics of solids and structures. In this paper a comparative study of three simulated random patterns is done. One of them is generated according to a new algorithm, introduced by the authors. A criterion for quantitative evaluation of random patterns after the calculation of their autocorrelation functions is introduced. The patterns' deformations are simulated numerically and realized experimentally. The displacements are measured by using the DIC method. Tensile tests are performed after printing the generated random patterns on surfaces of standard iron sheet specimens. It is found that the new designed random pattern keeps relatively good quality until reaching 20% deformation.
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