The propagation of fracture in rock is associated with a process zone in the form of a localized region of damage. Digital image correlation was employed to observe the process zone based on the measurements of the surface displacement field. A Berea sandstone beam with a center notch was tested in three-point bending and a charge-coupled device camera was used to acquire digital images. The images were concentrated on the area surrounding the notch and were processed using a cross-correlation algorithm based on the Fast Fourier Transform approach. The process zone was identified from the detailed measurements of the displacements related to the region surrounding the tip of the notch. In particular, the initiation of fracture was characterized by a region of localized damage. Furthermore, a traction-free part of the fracture was found from the measured displacement profile after sufficient propagation.
|Original language||English (US)|
|State||Published - Dec 1 2010|
|Event||44th US Rock Mechanics Symposium and the 5th US/Canada Rock Mechanics Symposium - Salt Lake City, UT, United States|
Duration: Jun 27 2010 → Jun 30 2010
|Other||44th US Rock Mechanics Symposium and the 5th US/Canada Rock Mechanics Symposium|
|City||Salt Lake City, UT|
|Period||6/27/10 → 6/30/10|