Investigation of Deformation at the Grain Scale in Polycrystalline Materials by Coupling Digital Image Correlation and Digital Microscopy

The purpose of this paper is to present an approach for the investigation of in-plane strain distribution at the grain scale in polycrystalline materials. The technique is developed by coupling digital image correlation and digital microscopy. By performing and analyzing a series of validation tests, performances and limits of this approach are quantified. An example of its application is presented for a Ni based alloy specimen. It is realized that this approach can obtain accurate displacement data. This technique can thus be used to investigate micromechanical behaviors of polycrystalline materials.