Volume Change Measurements Using 2D DIC System

Abstract

The presented study focuses on measuring volume changes in elastomeric materials using digital image correlation (DIC), specifically the 2D DIC universal system and the 2D DIC video-extensometer directly implemented to the universal testing machine. Optical measurement methods were applied in twodimensional (2D) configurations during the mechanical testing of dumbbell-shaped test specimens under uniaxial tension. The measured data were used to determine the dependencies of the bulk modulus and Poisson's ratio on the strain. The dependencies obtained by both methods correspond to the model behavior of rubber-like materials. Compared to the 2D DIC implemented video-extensometer, the 2D DIC universal system provides a tool for measuring transverse and longitudinal strain, and a wide range of post-processing options, including change of the input parameters, settings, or calculation relations.

Volume changes measurement of elastomers using 3D DIC

“…The ideal application of 2D DIC is limited to planar surfaces where in-plane deformations are expected and the camera must be positioned perpendicular to the measured object [10]. The 2D DIC devices can also include a video-extensometer, which can be implemented to a universal testing machine [11]. The 3D DIC systems use two or more cameras, and the software is able to record the position of a specific point of the measured object in the spatial area.…”

“…The aim of the research is to determine the method for measuring the dependence of the bulk modulus on the strain using DIC and to verify whether this method is applicable to selected types of test specimens. The presented paper also investigates how the stereo DIC configuration differs from the 2D DIC method, which the authors have already examined in the previous research [11].…”