3-D Digital Image Correlation Test (Nsa1)
Full-field Surface Displacement
A proof-test at NASA Langley Research Center for the CoLTS (Combined Loads Test System) program was performed with the 3-D Digital Image Correlation Technique developed by faculty and students at the University of South Carolina. The goal was to look at a 3.5"x3.5" area on a graphite-epoxy composite specimen with a 1.5" center notch, and determine the full-field, three-dimensional displacements it underwent during a standard tensile test. The lay-up on the specimen was (45,-45) up to 12 plys. Initial loading was 45 lbs, and failure occurred at 2600 lbs. An animated GIF is provided below with the images alongside the V displacement fields for comparison.
Images taken afterwards were of the specimen delaminating and cracking. You may also download the whole test (65 frames) in movie format:
Actual-size contour maps of the V displacement may be obtained from the following links: