Studies of Fracture Processes in Cement-Based Materials under Compression with Microtomography and Computer Vision

摘要

The primary objective of this research program was to provide experimental data to feed into the extensive modeling work of the AFOSR Shock Physics program. Two advanced complimentary experimental techniques were used: x-ray microtomography (XMT) and digital image correlation (DIC) . The former is a three dimensional technique that is restricted to small specimens under static loading, while the latter is a surface-only technique that can be applied in a variety of conditions. In the initial stages of the program we sought to correlate the fracture measurements of both techniques. By doing this we hoped to be able to develop a method to extrapolate 2D surface measurements (a relatively easy process) to three dimensions (a relatively difficult process) . Preliminary results indicate such a method could be developed, however confirmation over a wider range of experimental variables is necessary.