SYSTEM AND METHOD FOR REMOTE FULL FIELD THREE-DIMENSIONAL DISPLACEMENT AND STRAIN MEASUREMENTS

摘要

An apparatus for measuring full field deformation characteristics of a body, including: a load tester for deforming a specimen, the specimen having a pattern of optically distinct marks disposed on a surface of the specimen, two digital video cameras for acquiring two sequence of images of the pattern of marks before and after deformation of the specimen; and a computer processor having programmed instructions thereon for identifying the centroids of each image in the sequences of images, matching the centroids between the two images in a frame, generating a three- dimensional image based on the two images, calculating the displacement vector of the centroids of an three dimensional image and the centroids of a later three dimensional image, and calculating full field displacement and strain based on the displacement vector of the centroids using a mesh-free approximation.