From sparse 3D scans to dense 4D fracture measurements: Integrated projection-enhanced DVC

Digital Volume Correlation is an established method for measuring displacement fields from in situ experiments. 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 on-the-fly during an in situ fracture experiment. By combining integrated DVC with reduced-order Projection-enhanced DVC, it is possible to identify the nonlinear evolution of the crack-front, the mode I stress intensity factor, and the associated displacement fields throughout the in situ experiment.