Application of High-Speed Digital Image Correlation to Taylor Impact Testing

Abstract

Taylor impact studies were conducted using high-speed 3D digital image correlation (DIC). Taylor impact experiments are a well-established means of assessing material behavior at high strains and strain rates. Classically, the dynamic strength was determined from the final deformed shape of the sample. However, digital image correlation has been identified as a promising technique to provide time-resolved, full-field characterization of the dynamic failure behavior. This enables a better understanding of the deformation history and can provide a more robust validation of computational models, especially for complex, anisotropic problems. DIC involves applying a speckle pattern to the sample surface and tracking the deformation using two synchronized cameras. This allows for the determination of displacement, velocity, and strain field histories. In instances where the deformation is multiaxial, especially for non-planar samples, stereo DIC provides one of the only practical means of collecting full-field 3D data.