Improvement of the method of digital image correlation in the field of analyzing the processes of deformation and fracture of composites

The paper reflects new experimental results describing the processes of deformation and fracture of composites with significant structural heterogeneity with concentrators. A large-scale approach to the development of the method of digital image correlation (DIC) under complex modes of external influences is proposed. A number of methods of fixation of recorded data under cyclic impacts are considered. The peculiarities of each of the presented ways of data fixation depending on the main purpose of the research on the basis of static and cyclic tests of carbon fiber reinforced plastic specimens are outlined. Recommendations on the use of «analog capture» and «flex capture» options of the program «vic snap» are presented. The recommendations are valid for solving problems related to the analysis of regularities of deformation and fracture of objects with structural heterogeneity made of polymer composite materials under different modes of external loading. The study reflects the main methodological peculiarities arising when working with the non-contact optical video system VIC-3D and the method of correlation of digital images on polymer composite materials. Deformations at the structural and macroscopic levels are compared. Recommendations on the selection of post-treatment parameters, namely the step in the calculation by the KCI method, are proposed. A method of reducing the edge effect arising during uniaxial tensile testing of specimens with a concentrator is proposed. As a result of these studies, it becomes possible to obtain new experimental data on the processes of defect development and macroscopic fracture zones in the hole region, avoiding the influence of the edge zone.

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