Evaluating Strains Around Fiber and Matrix Interface of CFRP Using Global Digital Image Correlation

This study deals with the measurement of the displacement and discontinuous strain distributions around fiber and matrix interface of CFRP. Not only finite element global digital image correlation (FE global DIC) but also global DIC and local DIC are used for this purpose, and the results are compared. FE global DIC obtains nodal displacements by considering both the correlation coefficient of brightness value and the nodal forces of a mesh. The effectiveness of FE global DIC is demonstrated by applying it to the specimen simulating the section of CFRP. The measurement results by FE global DIC show the discontinuous strain distribution around the fiber-matrix interface. Therefore, these results reveal the effectiveness of FE global DIC to measure the strain field of a cross section in CFRP.