Abstract
A method for measuring strain near the interface of dissimilar materials is proposed by combining finite element and global digital image correlation, which takes into account the finite element equation as well as image information. Using this method, the strains of a specimen with a dissimilar material interface are measured and its effectiveness is demonstrated. Unlike conventional local digital image correlation, this method can evaluate the strains near the interface of materials with different properties without averaging the strain within the strain window. Even in the vicinity of a delaminated interface between dissimilar materials, strain measurement is possible by using a model that allows separation of the elements of the interface without sharing nodes between the elements on both sides of the interface. Therefore, this method is expected to be applied, for example, to the evaluation of strains at the fiber-resin interface in CFRP cross sections using microscopic images, and to strength evaluation of various dissimilar materials.
