Digital image correlation(DIC) is a non-contact optical measurement method for measuring displacement and strain. To use the DIC technique, feature points are needed to find the correlation between an object’s before and after deformation images. In...
Digital image correlation(DIC) is a non-contact optical measurement method for measuring displacement and strain. To use the DIC technique, feature points are needed to find the correlation between an object’s before and after deformation images. In many studies on DIC, generate speckle patterns on the specimen surface with airbrush painting to create feature points. In general, the paint pattern method has a problem in expressing accurate due to limitations in adhesion to the surface of the specimen. In this study, we used laser patterning to create structured patterns to be used as a feature point. A specimen with a structured pattern was tensile tested, and the surface of the specimen was photographed with a camera. The specimen surface strain field data were obtained using the image warping and DIC method of the photographed specimen image. The DIC technique presented in this study was verified by comparing the strain data obtained by the DIC method with the tensile test result data.