Digital Image Correlation Technique in Dynamic Applications on Deformable Targets

Digital Image Correlation (DIC) is a widely used optical measurement method to find the field of displacement and strain on the surface of an object. Even though a lot of studies have been done on this method and its uncertainty, there is still the possibility to do some improvements, especially in the case of dynamic conditions. In dynamic conditions since the target is moving, images acquired during the test have motion effect (blurring). This blurring can increase the uncertainty of the motion measurement. The present study aims to investigate the uncertainty of DIC method in dynamic conditions on deformable targets by conducting experiments and exploring the effect of the settings of the camera and of the motion parameters on the measuring uncertainty. Moreover, deconvolution method, which was previously proposed for rigid targets, is used here to improve the results in the case of dealing with deformable targets in dynamic conditions. Deconvolution method is a processing technique based on deconvolution that estimates the displacement of the target and the amount of motion effect that exists in an acquired image. The focus of this study is only on 2D DIC, but similar problems also exist in 3D DIC. Hence, an understanding of two-dimensional problems can be helpful for future studies in 3D conditions too.