Integrated Projection-enhanced DVC to monitor nonlinearities associated with fracture experiments

Digital Volume Correlation (DVC) is an established method for extracting full-field displacements from in-situ experiments monitored by X-ray computed tomography. However, the temporal sampling of such measurements is usually sparse, which limits the analysis of nonlinear phenomena such as plasticity, damage and failure. The method proposed herein consists in enriching the temporal sampling with projections acquired during loading of an in-situ cracking experiment. By combining an integrated DVC formulation with a reduced-order Projection-enhanced DVC, it becomes possible to identify the nonlinear evolution of the crack-front, the mode I stress intensity factor, and the associated displacement fields throughout the experiment.